Re: [PHP] Checkbox in PHP form

[Adam Randall]

 value="PFDs"
name="f_sequipment1">PFDs
Or with short tags:

 value="PFDs" name="f_sequipment1">PFDs
Adam.

On Sun, Nov 8, 2009 at 5:39 PM, Ernie Kemp  wrote:

>   Need some help here with checkboxes in an html form.
>
>
>
> My issue is I have a form that needs to be viewed with checkboxes filled in
> depending on the values in the table.
>
>
>
> I tried:
>
>  { echo "checked=yes";  } else { echo '';  } ?> value="PFDs"
> name=f_sequipment1>PFDs
>
> but the checkbox field is always checked.
>
>
>
> I thought of JavaScript also but it would have to be a “if $row[33] then
> run a JavaScript function” .  This is not working for me neither.
>
>
>
> Sorry if this seems trivial but I need your help.
>
>
>
> Thanks in advance.
>
>
>
>
>
>
>
>
>



-- 
Adam Randall
http://www.xaren.net
AIM: blitz574

Re: [PHP] checkbox unchecked

[tedd]

At 1:23 PM -0800 12/2/07, Casey wrote:

On Dec 2, 2007 1:08 PM, tedd <[EMAIL PROTECTED]> wrote:

You don't need to do anything.


When it's submitted:


That's true unless you're pulling data in from somewhere else (i.e., a dB).

Cheers,

tedd
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Re: [PHP] checkbox unchecked

[Casey]

On Dec 2, 2007 1:08 PM, tedd <[EMAIL PROTECTED]> wrote:
> At 12:36 PM -0600 12/2/07, Larry Garfield wrote:
> >First of all, using "y" and "n" for boolean values (such as a checkbox) is
> >very sloppy.  "n" is boolean True.  A boolean value should evaluate correctly
> >in a boolean context.  For that, you should use 1 and 0 for your values.
> >
> >What I usually do is this:
> >
> >
> > />
> >
> >Then when it gets submitted, foo will get the value of the form element that
> >was submitted last that has a value.  That is, if the checkbox is checked
> >then foo will be 1, otherwise it will be 0.  That gives you a nice, clean
> boolean value you can rely on being present (mostly ).
>
> Larry:
>
> Not that you said otherwise, but if the programmer does not set the
> value for a checkbox, html will provide values  -- that may lead to
> confusion for newer programmers.
>
> See here:
>
> http://webbytedd.com//checkbox/
>
> If you will note, without specifically setting the value, html will
> return "on".
>
> Also, I'm sure it's an oversight, but your code above should be:
>
> 
>
> Cheers,
>
> tedd
>
> --
> ---
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>
>
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>
>

You don't need to do anything.


When it's submitted:
http://www.php.net/)
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Re: [PHP] checkbox unchecked

[tedd]

At 12:36 PM -0600 12/2/07, Larry Garfield wrote:

First of all, using "y" and "n" for boolean values (such as a checkbox) is
very sloppy.  "n" is boolean True.  A boolean value should evaluate correctly
in a boolean context.  For that, you should use 1 and 0 for your values. 


What I usually do is this:


 />

Then when it gets submitted, foo will get the value of the form element that
was submitted last that has a value.  That is, if the checkbox is checked
then foo will be 1, otherwise it will be 0.  That gives you a nice, clean

boolean value you can rely on being present (mostly ).

Larry:

Not that you said otherwise, but if the programmer does not set the 
value for a checkbox, html will provide values  -- that may lead to 
confusion for newer programmers.


See here:

http://webbytedd.com//checkbox/

If you will note, without specifically setting the value, html will 
return "on".


Also, I'm sure it's an oversight, but your code above should be:



Cheers,

tedd

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Re: [PHP] checkbox unchecked

[Jürgen Wind]

nice!
but to avoid confusion it should read (assuming that $checked is a boolean
variable):

/>

IMHO


Larry Garfield wrote:
> 
> First of all, using "y" and "n" for boolean values (such as a checkbox) is 
> very sloppy.  "n" is boolean True.  A boolean value should evaluate
> correctly 
> in a boolean context.  For that, you should use 1 and 0 for your values.  
> 
> What I usually do is this:
> 
> 
>  />
> 
> Then when it gets submitted, foo will get the value of the form element
> that 
> was submitted last that has a value.  That is, if the checkbox is checked 
> then foo will be 1, otherwise it will be 0.  That gives you a nice, clean 
> boolean value you can rely on being present (mostly ).  
> 
> On Sunday 02 December 2007, Ronald Wiplinger wrote:
>> I have now tried to add many of the security hints on a web page and
>> come to a problem.
>> I am checking if the allowed fields match the sent fields.
>> From the database I get the information if a checkbox is checked or not:
>>
>> > $checked="checked";
>> } else {
>> $checked="";
>> }
>> ?>
>> 
>>
>>
>> If the user takes out the checkmark the value will become "" and the
>> field will not submitted which results in a missing field.
>>
>> $allowed = array();
>> $allowed[]='form';
>> $allowed[]='R_a';
>> $allowed[]='R_b';
>> 
>> $sent = $array_keys($_POST);
>> if($allowed == $sent) {
>> ... do some checking ...
>> } else {
>> echo "Expected input fields do not match!";
>> }
>> break;
>>
>>
>> How can I force a "n" for not checked in the input field? or how can I
>> solve that?
>>
>> bye
>>
>> Ronald
> 
> 
> -- 
> Larry GarfieldAIM: LOLG42
> [EMAIL PROTECTED] ICQ: 6817012
> 
> "If nature has made any one thing less susceptible than all others of 
> exclusive property, it is the action of the thinking power called an idea, 
> which an individual may exclusively possess as long as he keeps it to 
> himself; but the moment it is divulged, it forces itself into the
> possession 
> of every one, and the receiver cannot dispossess himself of it."  --
> Thomas 
> Jefferson
> 
> -- 
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
> 
> 
> 

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Re: [PHP] checkbox unchecked

[Steve Edberg]

Just to add my two cents -

I don't think it matters much what tokens you use to represent true 
or false, since you're going to be explicitly checking them on the 
server end anyway. I can't see much difference in principle between, 
for example:


if ($_GET['foo'] == 'y')...
and
if ($_GET['foo'] == '1')...
or even
if ($_GET['foo'] == 'Oui')...

One should really not do be doing just

if ($_GET['foo'])

anyway. Checking that a specific value is passed, rather than just 
some value that PHP evaluates to true or false, is one way to catch 
possible form hacking. For general reference, there are a number of 
php security howtos out there on how to sanitize user input, but I'll 
leave finding them as an 'excercize for the reader' at the moment. I 
suppose using 0/1 does have the advantage of 'doing the right thing' 
if a "if ($_GET['foo'])" creeps into your code, though. As would 
using 'Y'/''.


That being said, I've used 0/1 along with y/n in the past; it depends 
on whether I'm thinking like a programmer or a human ;)


steve


At 12:36 PM -0600 12/2/07, Larry Garfield wrote:

First of all, using "y" and "n" for boolean values (such as a checkbox) is
very sloppy.  "n" is boolean True.  A boolean value should evaluate correctly
in a boolean context.  For that, you should use 1 and 0 for your values. 


What I usually do is this:


 />

Then when it gets submitted, foo will get the value of the form element that
was submitted last that has a value.  That is, if the checkbox is checked
then foo will be 1, otherwise it will be 0.  That gives you a nice, clean
boolean value you can rely on being present (mostly ). 


On Sunday 02 December 2007, Ronald Wiplinger wrote:

 I have now tried to add many of the security hints on a web page and
 come to a problem.
 I am checking if the allowed fields match the sent fields.
 From the database I get the information if a checkbox is checked or not:

 
 


 If the user takes out the checkmark the value will become "" and the
 field will not submitted which results in a missing field.

 $allowed = array();
 $allowed[]='form';
 $allowed[]='R_a';
 $allowed[]='R_b';
 
 $sent = $array_keys($_POST);
 if($allowed == $sent) {
 ... do some checking ...
 } else {
 echo "Expected input fields do not match!";
 }
 break;


 How can I force a "n" for not checked in the input field? or how can I
 solve that?

 bye


 > Ronald




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Re: [PHP] checkbox unchecked

[Larry Garfield]

First of all, using "y" and "n" for boolean values (such as a checkbox) is 
very sloppy.  "n" is boolean True.  A boolean value should evaluate correctly 
in a boolean context.  For that, you should use 1 and 0 for your values.  

What I usually do is this:


 />

Then when it gets submitted, foo will get the value of the form element that 
was submitted last that has a value.  That is, if the checkbox is checked 
then foo will be 1, otherwise it will be 0.  That gives you a nice, clean 
boolean value you can rely on being present (mostly ).  

On Sunday 02 December 2007, Ronald Wiplinger wrote:
> I have now tried to add many of the security hints on a web page and
> come to a problem.
> I am checking if the allowed fields match the sent fields.
> From the database I get the information if a checkbox is checked or not:
>
>  $checked="checked";
> } else {
> $checked="";
> }
> ?>
> 
>
>
> If the user takes out the checkmark the value will become "" and the
> field will not submitted which results in a missing field.
>
> $allowed = array();
> $allowed[]='form';
> $allowed[]='R_a';
> $allowed[]='R_b';
> 
> $sent = $array_keys($_POST);
> if($allowed == $sent) {
> ... do some checking ...
> } else {
> echo "Expected input fields do not match!";
> }
> break;
>
>
> How can I force a "n" for not checked in the input field? or how can I
> solve that?
>
> bye
>
> Ronald


-- 
Larry Garfield  AIM: LOLG42
[EMAIL PROTECTED]   ICQ: 6817012

"If nature has made any one thing less susceptible than all others of 
exclusive property, it is the action of the thinking power called an idea, 
which an individual may exclusively possess as long as he keeps it to 
himself; but the moment it is divulged, it forces itself into the possession 
of every one, and the receiver cannot dispossess himself of it."  -- Thomas 
Jefferson

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Re: [PHP] checkbox unchecked

[Ronald Wiplinger]

Stephen wrote:
> Ronald Wiplinger wrote:
>> How can I force a "n" for not checked in the input field? or how can I
>> solve that?
>>   
> Either use radio buttons  or a drop down  for the input field.

Thanks!

>
> Stephen
>

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Re: [PHP] checkbox unchecked

[Afan Pasalic]

I did once, if I remember once, this "strategy":

>
If checked, you will have value "y". Though, if unchecked, or it was 
checked and visitor unchecked, the value should be "n".


;)

-afan


Ronald Wiplinger wrote:

I have now tried to add many of the security hints on a web page and
come to a problem.
I am checking if the allowed fields match the sent fields.
From the database I get the information if a checkbox is checked or not:





If the user takes out the checkmark the value will become "" and the
field will not submitted which results in a missing field.

$allowed = array();
$allowed[]='form';
$allowed[]='R_a';
$allowed[]='R_b';

$sent = $array_keys($_POST);
if($allowed == $sent) {
... do some checking ...
} else {
echo "Expected input fields do not match!";
}
break;


How can I force a "n" for not checked in the input field? or how can I
solve that?

bye

Ronald



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Re: [PHP] checkbox unchecked

[Stephen]

Ronald Wiplinger wrote:

How can I force a "n" for not checked in the input field? or how can I
solve that?
  

Either use radio buttons  or a drop down  for the input field.

Stephen

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Re: [PHP] Checkbox & Hidden Field to Delete Row - SOLVED

[Rahul S. Johari]

Ray,

Interestingly, I don't' allow special characters in File Names for files
being uploaded to the File Manager. So that problem won't occur.

Thanks.

On 6/1/06 4:23 PM, "Ray Hauge" <[EMAIL PROTECTED]> wrote:

> On Thursday 01 June 2006 13:15, Rahul S. Johari wrote:
> 
> Tad different, but that will definitely work as well.  It's a long shot, but
> just make sure that filenames don't have a "#" in them.


Rahul S. Johari
Coordinator, Internet & Administration
Informed Marketing Services Inc.
500 Federal Street, Suite 201
Troy NY 12180

Tel: (518) 687-6700 x154
Fax: (518) 687-6799
Email: [EMAIL PROTECTED]
http://www.informed-sources.com

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Re: [PHP] Checkbox & Hidden Field to Delete Row - SOLVED

[Ray Hauge]

On Thursday 01 June 2006 13:15, Rahul S. Johari wrote:
> Ave,
>
> I spent 3 hours trying to find or develop a solution for this problem...
> And believe it or not, within 3 minutes of sending the problem to the
> mailing list, I actually generated a solution!! Ray, you’re spot on with
> what’s actually happening, but this is what I did to resolve it...
>
> Here’s my code to generate the Dynamic Row with Checkboxes:
>   value=\"$myrow[ID]#imsafm/$showfilesuser/$myrow[filename]\"> type=hidden name=login value=$login> value=$showfilesuser>
>
> I completely eliminated the Hidden field... Instead, added the value of
> both the Row ID & the Filename to the checkbox, with a seperator “#”.
>
> Here’s my code to delete the Row & Corresponding File:
>
> foreach($thisID AS $value) {
> $pieces = explode("#", $value);
> $sql = "DELETE FROM file WHERE ID='$pieces[0]'";
> $result = mysql_query($sql) or die("Fatal Error: ".mysql_error());
> $thefile = "$pieces[1]";
> unlink($thefile);
> }
>
> As you can see, I basically explode the Array on the “#” seperator, and
> delete the Row & File. Is working like a charm!!
>

Tad different, but that will definitely work as well.  It's a long shot, but 
just make sure that filenames don't have a "#" in them.

-- 
Ray Hauge
Programmer/Systems Administrator
American Student Loan Services
www.americanstudentloan.com
1.800.575.1099

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Re: [PHP] Checkbox & Hidden Field to Delete Row - SOLVED

[Rahul S. Johari]

Ave,

I spent 3 hours trying to find or develop a solution for this problem... And
believe it or not, within 3 minutes of sending the problem to the mailing
list, I actually generated a solution!! Ray, you’re spot on with what’s
actually happening, but this is what I did to resolve it...

Here’s my code to generate the Dynamic Row with Checkboxes:
 

I completely eliminated the Hidden field... Instead, added the value of both
the Row ID & the Filename to the checkbox, with a seperator “#”.

Here’s my code to delete the Row & Corresponding File:

foreach($thisID AS $value) {
$pieces = explode("#", $value);
$sql = "DELETE FROM file WHERE ID='$pieces[0]'";
$result = mysql_query($sql) or die("Fatal Error: ".mysql_error());
$thefile = "$pieces[1]";
unlink($thefile);
}

As you can see, I basically explode the Array on the “#” seperator, and
delete the Row & File. Is working like a charm!!


On 6/1/06 4:07 PM, "Ray Hauge" <[EMAIL PROTECTED]> wrote:

> On Thursday 01 June 2006 12:58, Rahul S. Johari wrote:
>> Ave,
>> 
>> I¹m stuck on a problem here.
>> I have a file manager kind of application and I¹m trying to add the
>> functionality to delete multiple files.
>> 
>> Basically, there¹s a bunch of rows generated dynamically. Each row has a
>> checkbox for ³Delete² option, and a hidden field which contains the name of
>> the File associated with the record. If a user checks a checkbox to delete
>> certain rows, it should be able to delete those rows from mySQL as well as
>> delete the files associated with that record.
>> 
>> I created both the checkboxes & the hidden fields to be Arrays. I run a
>> loop to delete all rows (based on ID¹s) where the checkbox was Checked. It
>> does that part fine... The problem is linking the Filename array to the
>> Checkbox Array. It deletes the first two files uploaded no matter what rows
>> are checked. Basically, the Filename array is not associating with the
>> Checkbox array. So if  a person checks the 3rd and 5th checkbox... The 3rd
>> & 5th row is deleted from mySQL, but the 1st and 2nd file is deleted, not
>> the 3rd & 5th.
>> 
>> Rahul S. Johari
> 
> The problem is coming from how checkboxes submit their information to the
> form.  Only the checked checkboxes will actually send data.  The unchecked
> ones will not send anything.  Hidden fields differ, in that they ALWAYS send
> their data.  This is probably causing a mis-match between the two arrays.
> You could verify that by doing a var_dump on the arrays before you delete
> anything.
> 
> I would suggest that since you keep a record of the file in the database,
> include the file location in that database record.  Then before you delete
> it, get the file name, delete the file, then delete the record.  I think that
> would save you a bunch of headaches.

Rahul S. Johari
Coordinator, Internet & Administration
Informed Marketing Services Inc.
500 Federal Street, Suite 201
Troy NY 12180

Tel: (518) 687-6700 x154
Fax: (518) 687-6799
Email: [EMAIL PROTECTED]
http://www.informed-sources.com

Re: [PHP] Checkbox & Hidden Field to Delete Row

[Ray Hauge]

On Thursday 01 June 2006 12:58, Rahul S. Johari wrote:
> Ave,
>
> I¹m stuck on a problem here.
> I have a file manager kind of application and I¹m trying to add the
> functionality to delete multiple files.
>
> Basically, there¹s a bunch of rows generated dynamically. Each row has a
> checkbox for ³Delete² option, and a hidden field which contains the name of
> the File associated with the record. If a user checks a checkbox to delete
> certain rows, it should be able to delete those rows from mySQL as well as
> delete the files associated with that record.
>
> I created both the checkboxes & the hidden fields to be Arrays. I run a
> loop to delete all rows (based on ID¹s) where the checkbox was Checked. It
> does that part fine... The problem is linking the Filename array to the
> Checkbox Array. It deletes the first two files uploaded no matter what rows
> are checked. Basically, the Filename array is not associating with the
> Checkbox array. So if  a person checks the 3rd and 5th checkbox... The 3rd
> & 5th row is deleted from mySQL, but the 1st and 2nd file is deleted, not
> the 3rd & 5th.
>
> Rahul S. Johari

The problem is coming from how checkboxes submit their information to the 
form.  Only the checked checkboxes will actually send data.  The unchecked 
ones will not send anything.  Hidden fields differ, in that they ALWAYS send 
their data.  This is probably causing a mis-match between the two arrays.  
You could verify that by doing a var_dump on the arrays before you delete 
anything.

I would suggest that since you keep a record of the file in the database, 
include the file location in that database record.  Then before you delete 
it, get the file name, delete the file, then delete the record.  I think that 
would save you a bunch of headaches.

-- 
Ray Hauge
Programmer/Systems Administrator
American Student Loan Services
www.americanstudentloan.com
1.800.575.1099

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Re: [PHP] checkbox value

[[EMAIL PROTECTED]]

#   index.php

>


-afan
William Stokes wrote:
Hello,
I have a checkbox in a form. How can I determine if the user has set the 
checkbox on or not?

Thanks
-Will
 

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Re: [PHP] checkbox value

[Ken]

isset($_POST['checkboxname']) or isset($_GET['checkboxname'])
depending on the method of your form.

a good thing to do is to do var_dump($_POST) or var_dump($_GET) to see
all the values posted from the form...

hth

ken

On Thu, 24 Mar 2005 15:42:10 +0200, William Stokes <[EMAIL PROTECTED]> wrote:
> Hello,
> 
> I have a checkbox in a form. How can I determine if the user has set the
> checkbox on or not?
> 
> Thanks
> -Will
> 
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>

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RE: [PHP] checkbox arrays and validation

[Angelo Zanetti]

thanks Mike, 

worked like a charm!! 

and thanks to the others who replied!



>>> "Ford, Mike" <[EMAIL PROTECTED]> 10/5/2004 3:09:32 PM >>>
On 05 October 2004 13:55, Angelo Zanetti wrote:

> Hi Marek,
> 
> I try to access the array like this:
> 
>  document.frmft.elements["chkmodels[]"];
> 
> but doesnt work. I also tried this:
> 
> models = document.forms['frmft'].elements["chkmodels[]"];
> 
> is there not a problem with the elements part?

So long as your form goes something like:

  
Value 1
Value 2
Value 3
...
  

you can refer to the checkboxes simply as

   document.frmft["chkmodels[]"]

This is the way I've always done it, and it's always worked a treat.

Of course, in this situation this will give you an array of checkbox
objects which you then have to index into, but that's a whole other
story.

Cheers!

Mike

-
Mike Ford,  Electronic Information Services Adviser,
Learning Support Services, Learning & Information Services,
JG125, James Graham Building, Leeds Metropolitan University,
Headingley Campus, LEEDS,  LS6 3QS,  United Kingdom
Email: [EMAIL PROTECTED] 
Tel: +44 113 283 2600 extn 4730  Fax:  +44 113 283 3211 

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RE: [PHP] checkbox arrays and validation

[Ford, Mike]

On 05 October 2004 13:55, Angelo Zanetti wrote:

> Hi Marek,
> 
> I try to access the array like this:
> 
>  document.frmft.elements["chkmodels[]"];
> 
> but doesnt work. I also tried this:
> 
> models = document.forms['frmft'].elements["chkmodels[]"];
> 
> is there not a problem with the elements part?

So long as your form goes something like:

  
Value 1
Value 2
Value 3
...
  

you can refer to the checkboxes simply as

   document.frmft["chkmodels[]"]

This is the way I've always done it, and it's always worked a treat.

Of course, in this situation this will give you an array of checkbox objects which you 
then have to index into, but that's a whole other story.

Cheers!

Mike

-
Mike Ford,  Electronic Information Services Adviser,
Learning Support Services, Learning & Information Services,
JG125, James Graham Building, Leeds Metropolitan University,
Headingley Campus, LEEDS,  LS6 3QS,  United Kingdom
Email: [EMAIL PROTECTED]
Tel: +44 113 283 2600 extn 4730  Fax:  +44 113 283 3211 

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Re: [PHP] checkbox arrays and validation

[Angelo Zanetti]

Hi Marek, 

I try to access the array like this:

 document.frmft.elements["chkmodels[]"];

but doesnt work. I also tried this:

models = document.forms['frmft'].elements["chkmodels[]"];

is there not a problem with the elements part?

thanks


>>> Marek Kilimajer <[EMAIL PROTECTED]> 10/5/2004 2:19:26 PM >>>
Angelo Zanetti wrote:
> its the only form on the page...
> 
> Based on the other responses I will have to use chkmodels[] and need
to
> get the javascript working. Is it not possible to use the forms name
> when referencing the array?

You should be able to use:

document.formName
document.forms[0]
document.forms['formName']

> 
> thank again.
> Angelo
> 
> 
Marek Kilimajer <[EMAIL PROTECTED]> 10/5/2004 1:52:02 PM >>>
> 
> Angelo Zanetti wrote:
> 
>>Here is the OT part. how do I reference the checkboxes in javascript
> 
> if
> 
>>the chkmodels[] is used?
>>
>>I have tried many things like:
>>
>>myCheckboxArray = document.forms[0].elements["chkmodels[]"];
> 
> 
> The above should work. Is it really the first form on the page?

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Re: [PHP] checkbox arrays and validation

[Marek Kilimajer]

Angelo Zanetti wrote:
its the only form on the page...
Based on the other responses I will have to use chkmodels[] and need to
get the javascript working. Is it not possible to use the forms name
when referencing the array?
You should be able to use:
document.formName
document.forms[0]
document.forms['formName']
thank again.
Angelo

Marek Kilimajer <[EMAIL PROTECTED]> 10/5/2004 1:52:02 PM >>>
Angelo Zanetti wrote:
Here is the OT part. how do I reference the checkboxes in javascript
if
the chkmodels[] is used?
I have tried many things like:
myCheckboxArray = document.forms[0].elements["chkmodels[]"];

The above should work. Is it really the first form on the page?
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Re: [PHP] checkbox arrays and validation

[Angelo Zanetti]

its the only form on the page...

Based on the other responses I will have to use chkmodels[] and need to
get the javascript working. Is it not possible to use the forms name
when referencing the array?

thank again.
Angelo

>>> Marek Kilimajer <[EMAIL PROTECTED]> 10/5/2004 1:52:02 PM >>>
Angelo Zanetti wrote:
> Here is the OT part. how do I reference the checkboxes in javascript
if
> the chkmodels[] is used?
> 
> I have tried many things like:
> 
> myCheckboxArray = document.forms[0].elements["chkmodels[]"];

The above should work. Is it really the first form on the page?


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Re: [PHP] checkbox arrays and validation

[Marek Kilimajer]

Angelo Zanetti wrote:
Here is the OT part. how do I reference the checkboxes in javascript if
the chkmodels[] is used?
I have tried many things like:
myCheckboxArray = document.forms[0].elements["chkmodels[]"];
The above should work. Is it really the first form on the page?
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Re: [PHP] checkbox arrays and validation

[John Holmes]

Angelo Zanetti wrote:
but what I want to clarify is that if I change my PHP echo statement
to:
echo("" . $row['models_type'] . "");
basically without the [] then it is still recognised as an array. But
when the array is passed back it is returned as a string separated by
commas. Then I should use the split() function to create an array.
If you leave off the [], then only the last checkbox value remains in 
$_POST['chkmodels']. It is not passed as a comma separated string.

If you look at the query string, you'll see something like this:
?chkmodels=1&chkmodels=2
which means PHP makes $_POST['chkmodels'] equal to 1 for the first 
variable, then sets the same $_POST['chkmodels'] equal to 2 for the 
second variable in the query string. End result is one value (not an 
array) remaining in $_POST['chkmodels'].

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RE: [PHP] checkbox arrays and validation

[Ford, Mike]

On 05 October 2004 11:10, Angelo Zanetti wrote:

> Hi all,
> 
> this might be slightly off-topic in a way but Im looking for help not
> flaming. 
> 
> Ok I have a checkbox array that I populate from a DB using php:
> 
> while ($row = mysql_fetch_array($result))
>   echo("" . $row['models_type'] . "");
> 
> So when I want to see each variable in the array I use:
> 
>   foreach ($_POST['chkmodels'] as $c)
>   {
>   echo(" value: " . $c);
>   }
> 
> this is fine.
> 
> but what I want to clarify is that if I change my PHP echo statement
> to: 
> 
> echo("" . $row['models_type'] . "");
> 
> basically without the [] then it is still recognised as an array. But
> when the array is passed back it is returned as a string separated by
> commas.

No, this is incorrect.  You will see only the last value selected, returned
as a simple scalar.  PHP doesn't do automatic array-ification of multiple
values -- that's why you need the [] in the name attribute.

Cheers!

Mike

-
Mike Ford,  Electronic Information Services Adviser,
Learning Support Services, Learning & Information Services,
JG125, James Graham Building, Leeds Metropolitan University,
Headingley Campus, LEEDS,  LS6 3QS,  United Kingdom
Email: [EMAIL PROTECTED]
Tel: +44 113 283 2600 extn 4730  Fax:  +44 113 283 3211 

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Re: [PHP] Checkbox Question

[Curt Zirzow]

* Thus wrote Nick Wilson:
> Hi all, 
> 
> Im using php's cURL module to submit a form on a remote site. All is 
> *good* so far but i dont know what parameter to pass to ensure that 
> this checkbox is 'checked':
> 
> 

TIAS.

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Re: [PHP] Checkbox Question

[M. Sokolewicz]

Stephan Fiedler wrote:
Hi Nick,
Nick Wilson wrote:
Hi all, [...]

so, what is it? a=
[...]

if a was checked "a=on" is posted (or 'get'ed)
if not checked a isn't set.
Thanks very much!

You're welcome
Stephan
that actually depends on the browser. Mayne browsers send a= when it's 
not checked (meaning an EMPTY value)

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Re: [PHP] Checkbox Question

[Stephan Fiedler]

Hi Nick,
Nick Wilson wrote:
Hi all, 
[...]


so, what is it? a=
[...]
if a was checked "a=on" is posted (or 'get'ed)
if not checked a isn't set.
Thanks very much!
You're welcome
Stephan
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Re: [PHP] checkbox

[abrea]

If you put square brackets after the name (e.g. var[]) your form should 
produce an array called $_POST["var"] that comprises the checked boxes 
only.
e.g.




Regards
Alberto Brea
[EMAIL PROTECTED]



-Original Message-
From: "Aris  Santillan" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Date: Wed, 30 Jun 2004 15:56:35 +0800
Subject: [PHP] checkbox

> how can process  only items with checked check-box?
> 
> --- html ---
> 
> 
> 
> 
> 
> Untitled Document
> 
> 
> 
> 
>
> 
> 
>   
>
> 
>   
>   
>
>  
> 
>   
>
> 
>   
>   
>   
> 
> 
>   
> 
> 
> 
> 
> 
> 
> --- html ---
> 
> 
> 
> 
> 
> 
> 
> 

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Re: [PHP] checkbox

[Justin Patrin]

Try foreach ($_POST['textfield'] as $num => $value);

On Wed, 30 Jun 2004 15:56:35 +0800, Aris  Santillan
<[EMAIL PROTECTED]> wrote:
> 
> how can process  only items with checked check-box?
> 
> --- html ---
> 
> 
> 
> Untitled Document
> 
> 
> 
> 
>   
> 
> 
>   
>   
> 
> 
>   
>   
> 
> 
>   
>   
> 
> 
>   
>   
> 
> 
>   
> 
> 
> 
> 
> --- html ---
> 
> !DSPAM:40e26f26296421596418740!
> 


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Re: [PHP] checkbox: was it shown or not?

[Leif K-Brooks]

Chris Hayes (SENSE) wrote:

if i understand well, a checkbox in a form is only send on to the next 
page when it is checked: so the next page will only see a value in 
$_POST['checkboxname'] if it is set: else it is not set. Right?

So the followup page cannot see the difference between a form where 
the checkbox was not checked, and a form where the checkbox is not 
even there?
Correct.  This has little to do with PHP, though.

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Re: [PHP] checkbox: was it shown or not?

[Chris Hayes (SENSE)]

At 19:16 17-7-03, you wrote:
you understand it correctly
ok so i really have to add another kludgy workaround to my form class  :/

but thanks for confirming!


Chris
- Original Message -
From: "Chris Hayes (SENSE)" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, July 17, 2003 9:57 AM
Subject: [PHP] checkbox: was it shown or not?
> hi,
> if i understand well, a checkbox in a form is only send on to the next
page
> when it is checked: so the next page will only see a value in
> $_POST['checkboxname'] if it is set: else it is not set. Right?
>
> So the followup page cannot see the difference between a form where the
> checkbox was not checked, and a form where the checkbox is not even there?
>
> thanks,
> Chris
>
>
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>
>


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Re: [PHP] Checkbox

[SLanger]

Hello

>From a usability standpoint showing a checkbox that cannot be unchecked 
renders the checkbox obsolete. The consquence is not to show a checkbox at 
all. If you need an uncheckable checkbox because of licence aggreements or 
something like that. Or privacydeclaration type checkbox. Make it 
checkable but check on the server side if it is checked. If not render an 
error message to the client telling them why you can't process the 
form/data because the checkbox is unchecked. That way it is still up to 
the user to decide what he wants to do.
Another alternative is to build a button that has to be pressed to 
continue which does the same as the checkbox.


The important thing is:
1. Don't take away the users freedom of choice (checking / not checking)
2. Make the user feels he is in control (even though he isn't ;) )
3. Only put up control elements that actually enable the user to take 
control

Basically all three points are the same. 

I suggest to read up on usability issues. Just do a google on usability 
and software.
Cause usability is one of the things most of the webprogrammers get 
wrong... It's not important what your intention is rather what the user 
intents to do!

Please remember this is my opinion so take it or leave it. ;)

Regards
Stefan

Re: [PHP] Checkbox

[Gudmund Vatn]

Tim Burden wrote:

> Just using the readonly flag in the input tag is the easiest method, I
> think.

> - Original Message -
> From: "Reuben D. Budiardja" <[EMAIL PROTECTED]>
> Newsgroups: php.general
> To: "CPT John W. Holmes" <[EMAIL PROTECTED]>; "shaun"
> <[EMAIL PROTECTED]>
> Cc: <[EMAIL PROTECTED]>
> Sent: Wednesday, March 26, 2003 2:26 PM
> Subject: Re: [PHP] Checkbox


> On Wednesday 26 March 2003 02:11 pm, CPT John W. Holmes wrote:
> > >On Wednesday 26 March 2003 01:43 pm, CPT John W. Holmes wrote:
> > > > > is it possible to have a checkbox that if it is specified to be
> > checked
> > > > > when the page is being formulated then it cannot be unchecked?
> > > >
> > > > No. No... No.
> > > >
> > > > If you already know you don't want it to be unchecked, then don't show
> > > > a checkbox. That's why we have PHP, so you can create your page
> > DYNAMICALLY
> > > > and not show bits and pieces when you don't need to.
> > >
> > > Although that is theoretically correct, there can be some reason why one
> > would
> > > want to display a checkbox anyway. Sometimes it can be clearer for the
> > user> > to see the GUI, asthetic reason, etc, etc.

> > True. In that case, though, I would just show an image of a checked check
> > box. The end result will be the same to the user, they will just think
> it's
> > a checkbox they cannot uncheck.

> But isn't it so much easier to type in that one line HTML + javascript than
> trying to get an image of a checked check box.. unless you have that
> handy, you'd have to eg. take a snapshot, or draw something, then save the
> file as an image file...hmm...

> and as you said, the effect will be the same to the user anyway

> RDB

I don't think showing a checkbox will clear things up for the user.
Imagine, the use would probably get really annoyed not being able to check
that god damn checkbox. I say put some text there instead. Eg. "You can't
do this, because of this."


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Re: [PHP] Checkbox

[Jason Wong]

On Thursday 27 March 2003 03:26, Reuben D. Budiardja wrote:

> But isn't it so much easier to type in that one line HTML + javascript than
> trying to get an image of a checked check box.. unless you have that
> handy, you'd have to eg. take a snapshot, or draw something, then save the
> file as an image file...hmm...
>
> and as you said, the effect will be the same to the user anyway

Also different browsers on different platforms render checkboxes differently 
so your users will get some odd looking checkboxes.

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* Web Design & Hosting * Internet & Intranet Applications Development *
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RE: [PHP] Checkbox

[Kalin Mintchev]

hello,

how can i get the output file from the curl function to stream - to be
processed like from fopen or fsockopen?

thanks...


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RE: [PHP] Checkbox

[David Pearson]

Just be wary that not all browsers will honor the readonly flag (Netscape 4
for example).

In looking at this I found a tutorial at
http://www.estek.net/estek/idocs/forms/_INPUT_DISABLED.html .  I tested it
in IE 6, NS 7.02 and Opera 7.  None of these browsers prevented me from
checking and unchecking the box.  Only the DISABLED flag does.  Readonly
apparently prevents the user from altering the value of the input field.


-Original Message-
From: Tim Burden [mailto:[EMAIL PROTECTED]
Sent: Wednesday, March 26, 2003 11:25 AM
To: [EMAIL PROTECTED]
Subject: Re: [PHP] Checkbox


Just using the readonly flag in the input tag is the easiest method, I
think.

- Original Message -
From: "Reuben D. Budiardja" <[EMAIL PROTECTED]>
Newsgroups: php.general
To: "CPT John W. Holmes" <[EMAIL PROTECTED]>; "shaun"
<[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Wednesday, March 26, 2003 2:26 PM
Subject: Re: [PHP] Checkbox


On Wednesday 26 March 2003 02:11 pm, CPT John W. Holmes wrote:
> >On Wednesday 26 March 2003 01:43 pm, CPT John W. Holmes wrote:
> > > > is it possible to have a checkbox that if it is specified to be
> checked
> > > > when the page is being formulated then it cannot be unchecked?
> > >
> > > No. No... No.
> > >
> > > If you already know you don't want it to be unchecked, then don't show
> > > a checkbox. That's why we have PHP, so you can create your page
> DYNAMICALLY
> > > and not show bits and pieces when you don't need to.
> >
> > Although that is theoretically correct, there can be some reason why one
> would
> > want to display a checkbox anyway. Sometimes it can be clearer for the
> user> > to see the GUI, asthetic reason, etc, etc.

> True. In that case, though, I would just show an image of a checked check
> box. The end result will be the same to the user, they will just think
it's
> a checkbox they cannot uncheck.

But isn't it so much easier to type in that one line HTML + javascript than
trying to get an image of a checked check box.. unless you have that
handy, you'd have to eg. take a snapshot, or draw something, then save the
file as an image file...hmm...

and as you said, the effect will be the same to the user anyway

RDB


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Re: [PHP] Checkbox

[CPT John W. Holmes]

> But isn't it so much easier to type in that one line HTML + javascript
than
> trying to get an image of a checked check box.. unless you have that
> handy, you'd have to eg. take a snapshot, or draw something, then save the
> file as an image file...hmm...
>
> and as you said, the effect will be the same to the user anyway

Yeah, really doesn't matter how you do it, I guess. Just so long as you
check the data after it's submitted again and determine whether the value
should have been allowed to change or not. If it wasn't allowed to change,
then don't accept the value that was passed (because it may of changed
regardless of what measures you take).

Like you said, hopefully that part is obvious, though. :)

---John Holmes...


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RE: [PHP] Checkbox

[Sysadmin]

I agree...and like John said, as long as you don't accept any changes 
when you process the form you should be good to go...

-Original Message-
From: Tim Burden [mailto:[EMAIL PROTECTED]
Sent: Wednesday, March 26, 2003 2:25 PM
To: [EMAIL PROTECTED]
Subject: Re: [PHP] Checkbox


Just using the readonly flag in the input tag is the easiest method, I
think.

- Original Message -
From: "Reuben D. Budiardja" <[EMAIL PROTECTED]>
Newsgroups: php.general
To: "CPT John W. Holmes" <[EMAIL PROTECTED]>; "shaun"
<[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Wednesday, March 26, 2003 2:26 PM
Subject: Re: [PHP] Checkbox


On Wednesday 26 March 2003 02:11 pm, CPT John W. Holmes wrote:
> >On Wednesday 26 March 2003 01:43 pm, CPT John W. Holmes wrote:
> > > > is it possible to have a checkbox that if it is specified to be
> checked
> > > > when the page is being formulated then it cannot be unchecked?
> > >
> > > No. No... No.
> > >
> > > If you already know you don't want it to be unchecked, then don't 
show
> > > a checkbox. That's why we have PHP, so you can create your page
> DYNAMICALLY
> > > and not show bits and pieces when you don't need to.
> >
> > Although that is theoretically correct, there can be some reason 
why one
> would
> > want to display a checkbox anyway. Sometimes it can be clearer for 
the
> user> > to see the GUI, asthetic reason, etc, etc.

> True. In that case, though, I would just show an image of a checked 
check
> box. The end result will be the same to the user, they will just think
it's
> a checkbox they cannot uncheck.

But isn't it so much easier to type in that one line HTML + javascript 
than
trying to get an image of a checked check box.. unless you have that
handy, you'd have to eg. take a snapshot, or draw something, then save 
the
file as an image file...hmm...

and as you said, the effect will be the same to the user anyway

RDB


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Re: [PHP] Checkbox

[Tim Burden]

Just using the readonly flag in the input tag is the easiest method, I
think.

- Original Message -
From: "Reuben D. Budiardja" <[EMAIL PROTECTED]>
Newsgroups: php.general
To: "CPT John W. Holmes" <[EMAIL PROTECTED]>; "shaun"
<[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Wednesday, March 26, 2003 2:26 PM
Subject: Re: [PHP] Checkbox


On Wednesday 26 March 2003 02:11 pm, CPT John W. Holmes wrote:
> >On Wednesday 26 March 2003 01:43 pm, CPT John W. Holmes wrote:
> > > > is it possible to have a checkbox that if it is specified to be
> checked
> > > > when the page is being formulated then it cannot be unchecked?
> > >
> > > No. No... No.
> > >
> > > If you already know you don't want it to be unchecked, then don't show
> > > a checkbox. That's why we have PHP, so you can create your page
> DYNAMICALLY
> > > and not show bits and pieces when you don't need to.
> >
> > Although that is theoretically correct, there can be some reason why one
> would
> > want to display a checkbox anyway. Sometimes it can be clearer for the
> user> > to see the GUI, asthetic reason, etc, etc.

> True. In that case, though, I would just show an image of a checked check
> box. The end result will be the same to the user, they will just think
it's
> a checkbox they cannot uncheck.

But isn't it so much easier to type in that one line HTML + javascript than
trying to get an image of a checked check box.. unless you have that
handy, you'd have to eg. take a snapshot, or draw something, then save the
file as an image file...hmm...

and as you said, the effect will be the same to the user anyway

RDB


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Re: [PHP] Checkbox

[Reuben D. Budiardja]

On Wednesday 26 March 2003 02:11 pm, CPT John W. Holmes wrote:
> >On Wednesday 26 March 2003 01:43 pm, CPT John W. Holmes wrote:
> > > > is it possible to have a checkbox that if it is specified to be
> checked
> > > > when the page is being formulated then it cannot be unchecked?
> > >
> > > No. No... No.
> > >
> > > If you already know you don't want it to be unchecked, then don't show
> > > a checkbox. That's why we have PHP, so you can create your page
> DYNAMICALLY
> > > and not show bits and pieces when you don't need to.
> >
> > Although that is theoretically correct, there can be some reason why one
> would
> > want to display a checkbox anyway. Sometimes it can be clearer for the
> user> > to see the GUI, asthetic reason, etc, etc.

> True. In that case, though, I would just show an image of a checked check
> box. The end result will be the same to the user, they will just think it's
> a checkbox they cannot uncheck.

But isn't it so much easier to type in that one line HTML + javascript than 
trying to get an image of a checked check box.. unless you have that 
handy, you'd have to eg. take a snapshot, or draw something, then save the 
file as an image file...hmm...

and as you said, the effect will be the same to the user anyway

RDB


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Re: [PHP] Checkbox

[CPT John W. Holmes]

>On Wednesday 26 March 2003 01:43 pm, CPT John W. Holmes wrote:
> > > is it possible to have a checkbox that if it is specified to be
checked
> > > when the page is being formulated then it cannot be unchecked?
> >
> > No. No... No.
> >
> > If you already know you don't want it to be unchecked, then don't show a
> > checkbox. That's why we have PHP, so you can create your page
DYNAMICALLY
> > and not show bits and pieces when you don't need to.
>
> Although that is theoretically correct, there can be some reason why one
would
> want to display a checkbox anyway. Sometimes it can be clearer for the
user
> to see the GUI, asthetic reason, etc, etc.

True. In that case, though, I would just show an image of a checked check
box. The end result will be the same to the user, they will just think it's
a checkbox they cannot uncheck.

---John Holmes...


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Re: [PHP] Checkbox

[Reuben D. Budiardja]

On Wednesday 26 March 2003 01:43 pm, CPT John W. Holmes wrote:
> > is it possible to have a checkbox that if it is specified to be checked
> > when the page is being formulated then it cannot be unchecked?
>
> No. No... No.
>
> If you already know you don't want it to be unchecked, then don't show a
> checkbox. That's why we have PHP, so you can create your page DYNAMICALLY
> and not show bits and pieces when you don't need to.

Although that is theoretically correct, there can be some reason why one would 
want to display a checkbox anyway. Sometimes it can be clearer for the user 
to see the GUI, asthetic reason, etc, etc. 

> There are plenty of JavaScript or other workarounds you can do, but you
> still need to verify _everything_ on the server side and don't accept any
> changed value.

Of course, that's obvious. I see the question from the user interface point of 
view. Functionally, the javascript doesn't do anything, except give the 
original poster what he wants.

RDB

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Re: [PHP] Checkbox

[CPT John W. Holmes]

> is it possible to have a checkbox that if it is specified to be checked
> when the page is being formulated then it cannot be unchecked?

No. No... No.

If you already know you don't want it to be unchecked, then don't show a
checkbox. That's why we have PHP, so you can create your page DYNAMICALLY
and not show bits and pieces when you don't need to.

There are plenty of JavaScript or other workarounds you can do, but you
still need to verify _everything_ on the server side and don't accept any
changed value.

---John Holmes...


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Re: [PHP] Checkbox

[Reuben D. Budiardja]

On Wednesday 26 March 2003 09:16 am, shaun wrote:
> Hi,
>
> is it possible to have a checkbox that if it is specified to be checked
> when the page is being formulated then it cannot be unchecked?

When you write the page, if the checkbox is checked initially, write also a 
javascript to prevent it from being uncheck. Something like this:



So everytime it's clicked, the javascript will make sure that it's checked 
again.

HTH
-RDB


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RE: [PHP] Checkbox related...

[Ernest E Vogelsinger]

At 20:34 16.02.2003, Dhaval Desai said:
[snip]
>How do we do it using the first option i.e javascript to count how many 
>boxes are checked...could you give some example...
[snip] 

Warning - untested:


function validateChecks()
{
aboxes = Array('box1','box2','box3','box4','box5');
hF = document.forms['myform'];
if (hF) {
for (i = 0, count=0; i < aboxes.length; i++) {
   hBox = hF.elements[aboxes[i]];
   if (hBox.checked) {
   ++count;
   if (count >= 2)
   return true;
   }
}
}
return false;
}















I believe you get the idea...


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   (\)ICQ #13394035
^ http://www.vogelsinger.at/



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RE: [PHP] Checkbox related...

[Dhaval Desai]

How do we do it using the first option i.e javascript to count how many 
boxes are checked...could you give some example...

Thanx

-Dhaval






From: "David McInnis" <[EMAIL PROTECTED]>
To: "'Dhaval Desai'" <[EMAIL PROTECTED]>
Subject: RE: [PHP] Checkbox related...
Date: Sun, 16 Feb 2003 10:59:17 -0800

You can use javascript to count the number of items checked or you can
check the size of your array once the form has been submitted to the
server.

David

-Original Message-
From: Dhaval Desai [mailto:[EMAIL PROTECTED]]
Sent: Sunday, February 16, 2003 10:58 AM
To: [EMAIL PROTECTED]
Subject: [PHP] Checkbox related...

Hi everybody,

I have a form with 5 checkboxes. I want to make sure that a user checks
atleast 2 boxes before he can proceed. How can that be made possible.

Thank you

-Dhaval





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Re: [PHP] Checkbox related...

[Ernest E Vogelsinger]

At 19:57 16.02.2003, Dhaval Desai said:
[snip]
>I have a form with 5 checkboxes. I want to make sure that a user checks 
>atleast 2 boxes before he can proceed. How can that be made possible.
[snip] 

You have 2 options:

1) Client-side JavaScript: in the forms OnSubmit handler, loop your
checkboxes and make sure at least 2 are checked. If the precondition is not
met, return false from the onSubmit handler.

2) Server-Side via PHP: make an array of all available checkboxes, and walk
this array to see if you have at least 2 of these checkboxes set in your
$_REQUEST array. If the precondition is not met, retransmit the original
form without proceeding.

I'd prefer a combination of both - the JS method saves the user an
unnecessary form transmission, speeding up his entry. The server-side
script method makes sure there's no malicious user trying to trick the
system *g*


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Re: [PHP] checkbox objects returning false for isset() when submittedvia a form.

[Chris Wesley]

On Tue, 1 Oct 2002, DonPro wrote:

> Within my form, I have some checkbox objects.  If I check them and submit my
> form, isset(variable) returns true.  However, if I do not check them and
> submit my form, isset(variable) returns false.
> I am confused as I though that isset() returns true if the variable exists
> regardless if it is empty or not.  Is there a way to do what I want?

Checkbox values are only sent if they are "on" (checked).

http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13.2

~Chris


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Re: [PHP] checkbox question

[Alex Shi]

Thanks for your reply!

I tested $_SERVER['QUERY_STRING']. Seems like it only return the
string for get method but not for post. Any idea?

Alex



"Marek Kilimajer" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> If you cannot use square brackets, get the values yourself from
> $_SERVER['QUERY_STRING']
>
> Alex Shi wrote:
>
> >How to ontain data from a group of checkbox using same name?
> >For example, in a form there're 6 checkboxes and all named as
> >"Interesting_Area". I know if put a pairs of square brackets at the
> >end of the name then in php all the values of them can be ontained.
> >However, for some reason I cannot use square brackets. Please
> >help me out if anyone know how to do the trick. THanks!
> >
> >Alex
> >
> >
> >
> >
>


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Re: [PHP] checkbox question

[Marek Kilimajer]

If you cannot use square brackets, get the values yourself from 
$_SERVER['QUERY_STRING']

Alex Shi wrote:

>How to ontain data from a group of checkbox using same name?
>For example, in a form there're 6 checkboxes and all named as
>"Interesting_Area". I know if put a pairs of square brackets at the
>end of the name then in php all the values of them can be ontained.
>However, for some reason I cannot use square brackets. Please
>help me out if anyone know how to do the trick. THanks!
>
>Alex
>
>
>  
>


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Re: [PHP] Re: PHP checkbox/hidden field question

[Erwin]

Marek Kilimajer wrote:
> You are wrong, this is from HTML 4.01 specification:
>

You're right. Thanks for your reply!

Grtz Erwin



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RE: [PHP] Re: PHP checkbox/hidden field question

[victor]

Some check box info here too:

http://www.experts-exchange.com/Web/Web_Languages/PHP/Q_20117420.html

- Victor > www.argilent.com

-Original Message-
From: Marek Kilimajer [mailto:[EMAIL PROTECTED]] 
Sent: Monday, September 02, 2002 7:24 AM
To: PHP
Subject: Re: [PHP] Re: PHP checkbox/hidden field question

You are wrong, this is from HTML 4.01 specification:

value = /cdata/ <cid:[EMAIL PROTECTED]> [CA]
<cid:[EMAIL PROTECTED]>
This attribute specifies the initial value
<cid:[EMAIL PROTECTED]> of
the control. It is optional except when the 
type <cid:[EMAIL PROTECTED]> attribute has the value
"radio" or "checkbox".

Upon submiting a form, only "successfull" checkboxes are submited,
so on the next page you only need this loop:

foreach($d_c_arr as $i) {
echo '';
}

$d_c_arr contains only checked checkboxes.

Marek

Erwin wrote:

>>I am executing the follwoing statement as part of a "while" loop.
>>This is part of a form and I wish to pass the name and value of the
>>checkbox as a hidden field only is the checkbox is checked. Can you
>>suggest how I can accomplish this task?
>>
>>
>>">
>>
>>
>
>As you might know, checkboxes don't have the VALUE attribute. HTML
won't
>even submit the VALUE attribute to the next page. You will only have an
>array containing 0's and 1's, the results of the checkboxes. So, on the
next
>page, you will have to lookup the values again.
>Then print the hidden input's to the page in a for loop, while looping
>trough $d_c_arr.
>
>HTH
>Erwin
>
>
>
>  
>

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Re: [PHP] Re: PHP checkbox/hidden field question

[Marek Kilimajer]

You are wrong, this is from HTML 4.01 specification:

value = /cdata/  [CA] 

This attribute specifies the initial value  of
the control. It is optional except when the 
type  attribute has the value "radio" or 
"checkbox".

Upon submiting a form, only "successfull" checkboxes are submited,
so on the next page you only need this loop:

foreach($d_c_arr as $i) {
echo '';
}

$d_c_arr contains only checked checkboxes.

Marek

Erwin wrote:

>>I am executing the follwoing statement as part of a "while" loop.
>>This is part of a form and I wish to pass the name and value of the
>>checkbox as a hidden field only is the checkbox is checked. Can you
>>suggest how I can accomplish this task?
>>
>>
>>">
>>
>>
>
>As you might know, checkboxes don't have the VALUE attribute. HTML won't
>even submit the VALUE attribute to the next page. You will only have an
>array containing 0's and 1's, the results of the checkboxes. So, on the next
>page, you will have to lookup the values again.
>Then print the hidden input's to the page in a for loop, while looping
>trough $d_c_arr.
>
>HTH
>Erwin
>
>
>
>  
>

[PHP] RE: PHP checkbox/hidden field question

[Tim Ward]

you need to define the key for checkbox arrays in order to distinguish them
(as only the checked ones will be posted)..
something like ...




Tim Ward
www.chessish.com

> -Original Message-
> From: Paul Maine [mailto:[EMAIL PROTECTED]]
> Sent: 02 September 2002 00:56
> To: PHP PHP
> Subject: PHP checkbox/hidden field question
> 
> 
> I am executing the follwoing statement as part of a "while" 
> loop. This is
> part of a form and I wish to pass the name and value of the 
> checkbox as a
> hidden field only is the checkbox is checked. Can you suggest 
> how I can
> accomplish this task?
> 
> 
> ">
> 
> Thank You
> Paul
> php
> 
> 

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[PHP] Re: PHP checkbox/hidden field question

[Erwin]

> I am executing the follwoing statement as part of a "while" loop.
> This is part of a form and I wish to pass the name and value of the
> checkbox as a hidden field only is the checkbox is checked. Can you
> suggest how I can accomplish this task?
>
>
> ">

As you might know, checkboxes don't have the VALUE attribute. HTML won't
even submit the VALUE attribute to the next page. You will only have an
array containing 0's and 1's, the results of the checkboxes. So, on the next
page, you will have to lookup the values again.
Then print the hidden input's to the page in a for loop, while looping
trough $d_c_arr.

HTH
Erwin



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Re: [PHP] Checkbox question

[José Jeria]

Hmmm, then the book "Beginning PHP" from Wrox is wrong...

/J

Jason Wong wrote:
> On Friday 16 August 2002 17:54, José Jeria wrote:
> 
>>I have a page with a checkbox, when i submit to the next page the
>>variable $whatever (the checkboxes name.) will be "On" if its checked,
>>and it will be undefined if its not checked.
>>
>>Shouldn't it be a empty string? and not undefined?
> 
> 
> That is how it works. If it's not checked it does not get defined.
> 


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Re: [PHP] Checkbox question

[Jason Wong]

On Friday 16 August 2002 17:54, José Jeria wrote:
> I have a page with a checkbox, when i submit to the next page the
> variable $whatever (the checkboxes name.) will be "On" if its checked,
> and it will be undefined if its not checked.
>
> Shouldn't it be a empty string? and not undefined?

That is how it works. If it's not checked it does not get defined.

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Re: [PHP] checkbox => POST => array??

[Brent Baisley]

I'm doing something very similar on a project I'm working on, except I'm 
using radio buttons. I'm not quite sure what are using the ID for (for 
style sheets or a data ID). If you are using it as a data ID, then you 
can make it part of the topic[] array. So it would look like this:


Then to process the array, you would do something like this:
while (list($checkboxID,$checkboxValue) = each $topic) {
// Your process code
}

Each check box is then referenced by the two variables $checkboxID and 
$checkboxValue. There are a number of ways ou can do this, really any 
way you would process and array (i.e. foreach). I prefer this way 
because I can give logical names to the array elements I am using.


On Saturday, August 10, 2002, at 02:56 PM, PeterV wrote:

> I,
> I don't have my books here and it's been a while since I did PHP, and 
> google isn't helping:
> How do I code a bunch of checkboxes with id's, and then loop trough the 
> result as an array after POSTing it?
> What I have now:
> 
> doesn't return an array $topic??
> Thanks,
> Peter
>
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Re: [PHP] checkbox => POST => array??

[Jason Stechschulte]

On Sat, Aug 10, 2002 at 02:56:48PM -0400, PeterV wrote:
> What I have now:
> 
> doesn't return an array $topic??

Probaby due to register_globals.  It should exist in $_POST['topic']

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RE: [PHP] Checkbox Initial Value based on record in db

[Craig Vincent]

> Kinda off topic here, just checking to see If I am on the right track with
> this
>
> 
>
> the result should be :
>
> IF the record contains the field "abb" and it has a value of 1
> then it will
> be checked off for viewing.

No, that wouldn't workto have a checkbox autochecked the HTML must be
similar to



So a sample coding might be

>

Sincerely,

Craig Vincent



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Re: [PHP] Checkbox Initial Value based on record in db

[1LT John W. Holmes]

It will only be checked if you put CHECKED in your HTML.

if($myrow['abb'] == 1) { echo " checked "; }

Add that into your input element.

---John Holmes...

- Original Message -
From: "Daniel Negron/KBE" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, May 01, 2002 1:04 PM
Subject: [PHP] Checkbox Initial Value based on record in db


Kinda off topic here, just checking to see If I am on the right track with
this



the result should be :

IF the record contains the field "abb" and it has a value of 1 then it will
be checked off for viewing.

Brainfarting all day !!


Thank You

<><><><><><><><><><><><><><><><>

Daniel Negrón
Lotus Notes Administrator / Developer
KB Electronics, Inc.
954.346.4900x122
http://www.kbelectronics.com

<><><><><><><><><><><><><><><><>


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Re: [PHP] Checkbox Initial Value based on record in db

[Miguel Cruz]

On Wed, 1 May 2002, Daniel Negron/KBE wrote:
> Kinda off topic here, just checking to see If I am on the right track with
> this
> 
> 
> 
> the result should be :
> 
> IF the record contains the field "abb" and it has a value of 1 then it will
> be checked off for viewing.

http://www.w3.org/TR/REC-html32#fields




miguel


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Re: [PHP] checkbox doesn't pass?

[Philip Olson]

Unchecked checkboxes pass no values, that's how 
it works.  It's either set or not.  Default value 
for a checkbox is 'on' although you can change
that.  isset() will work fine.

Regards,
Philip




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Re: [PHP] checkbox doesn't pass?

[Chris Boget]

> >But IF I still want  to use $HTTP_POST_VARS, what then? What about the
> >warning when checkbox is not checked?
> I use empty() to check the for the existence of checkbox variables.

You can also use isset();

Chris


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RE: [PHP] checkbox doesn't pass?

[Matt Schroebel]

You should use $HTTP_POST_VARS (or $_POST) all of the time.  There's security risks in 
using register_globals. It's not risky in all cases. But register_globals will allow 
arbitrary variables to be added to into the name space of your script by simply 
putting them on the uri.  Code not expecting such input, and expecting variables not 
to exist unless the script set them may behave unexpectedly.

The reason the variable is not set is that the checkbox isn't checked.  You can test 
the variable with isset(), or empty() before you use it so you don't get the warning.

To learn what your script it seeing when you submit the page, do a:
foreach ($HTTP_POST_VARS as $key => $value) {
echo "Key: $key Value: $value\n";
}
at the top of your action handler script, and watch the variables come in when you 
check or not check the checkboxes.  Once you understand that, then write the code to 
handle the situation.

> -Original Message-
> From: savaidis [mailto:[EMAIL PROTECTED]] 
> Sent: Thursday, April 04, 2002 10:17 AM
> Thank you both for help and info! You were both very fast :)
> I didn't know I could  not to use $HTTP_POST_VARS . Now it 
> works all right.
> But IF I still want  to use $HTTP_POST_VARS, what then? What about the
> warning when checkbox is not checked?

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RE: [PHP] checkbox doesn't pass?

[Eugene Mah]

At 18:17 04-04-02 +0300, savaidis wrote:

>But IF I still want  to use $HTTP_POST_VARS, what then? What about the
>warning when checkbox is not checked?
I use empty() to check the for the existence of checkbox variables.


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RE: [PHP] checkbox doesn't pass?

[savaidis]

Thank you both for help and info! You were both very fast :)
I didn't know I could  not to use $HTTP_POST_VARS . Now it works all right.
But IF I still want  to use $HTTP_POST_VARS, what then? What about the
warning when checkbox is not checked?

Thanks

Makis


> -Original Message-
> From: Jason Wong [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, April 04, 2002 5:51 PM
> To: [EMAIL PROTECTED]
> Subject: Re: [PHP] checkbox doesn't pass?
>
>
> On Thursday 04 April 2002 20:46, [EMAIL PROTECTED] wrote:
>
> > why do you use $HTTP_POST_VARS? Do I miss something?
>
> For security reasons.
>
> Manual > Security
>
>
>
> --
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>
> /*
> Above all things, reverence yourself.
> */
>
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Re: [PHP] checkbox doesn't pass?

[Jason Wong]

On Thursday 04 April 2002 20:46, [EMAIL PROTECTED] wrote:

> why do you use $HTTP_POST_VARS? Do I miss something?

For security reasons.

Manual > Security



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Re: [PHP] checkbox doesn't pass?

[heinisch]

At 04.04.2002  15:23, you wrote:
>
>
>I have a html form with some "text" (T1) and "checkbox" (C1) fields to pass
>it to a php script.
>
>Accessing "text" fields has no problem.
>
>There is a problem when I use
>$C1=$HTTP_POST_VARS['C1']
>to take the value of C1 (ON)
>If it is not checked, then it is not set at all. (??why??)
>So I use :
>if (!isset($C1)) { $C1="0" }
>but still I get an warning that C1 is not set, on my screen.
>That happens before the use  of isset function.
>How can I susspent this warning message?
Makis,
why do you use $HTTP_POST_VARS? Do I miss something?
if you have a form and send it, the vars have the same names as in your
form, will say if your checkbox name="foo" value="someval" will be transmitted,
then in the following page there´s a var named $foo. and the value will be 
"someval"
if the box is checked, otherwise there´s no (or NULL or FALSE ???) value in it.
I personally prefer put checkbox vars (if there are several) in an array 
f.e. $foo[]
In the following page I just scan the array and if there´s a value in a field
thats fine.
HTH Oliver


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Re: [PHP] checkbox validation

[Keyur Kalaria]

Hi jacky,

put an empty square bracket after the variable name as follows:


assuming that your above statement is in a loop we will have following
structure:
*




etc...





now when you submit the form, an array named id[ ] will be posted .
this array will contain the number of elements/checkbox  which were checked
on.
so out of 25 checkboxes if you select only 5 checkboxes, then the size of
the array id[ ] will be only 5.

so with another loop you can retrieve all the values as follows:
***
$i=0;
while($i
To: <[EMAIL PROTECTED]>
Sent: Thursday, April 19, 2001 1:13 AM
Subject: [PHP] checkbox validation


Hi all
I have a form with the checkbox like this

$query="select id from foo";
$result=($query,$con);
while ($row = mysql_fetch_array($result))
 {

 }
submit button and stuffs here...


After I submit to next page, at next page, how do I check which check box is
checked?
like this?

if ($id=="on") {
do something
}else{
do something
}

I did try this but did not work, what am i suppose to do to achieve this?
Jack
[EMAIL PROTECTED]
"There is nothing more rewarding than reaching the goal you set for
yourself"



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Re: [PHP] checkbox validation

[Robert Vetter]

Jacky wrote:
> 
> Hi all
> I have a form with the checkbox like this
> 
> $query="select id from foo";
> $result=($query,$con);
> while ($row = mysql_fetch_array($result))
>  {
> 
>  }
> submit button and stuffs here...
> 

One possibility:
Add a hidden field in the form and write all names of the checkboxes in
it, separated by a semicolon, for example.
-

$query="select id from foo";
$result=($query,$con);
while ($row = mysql_fetch_array($result))
{

$names_of_checkboxes.=$id.";";
}

 submit button and stuffs here...
 
---
Then, in the next page you just do following:
---
$checkboxes_names_array=explode(";",$names_of_checkboxes);
for($x=0;xhttp://www.php.net/)
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RE: [PHP] checkbox validation

[Matt Williams]

> After I submit to next page, at next page, how do I check which 
> check box is checked?
> like this?
> 
> if ($id=="on") {
> do something
> }else{
> do something
> }

Hi 

try this assuming you have no toher check boxes called $id

if(isset($id))
{
  do something
}else{
  do other
}

M@

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