[PHP] For your reference, how to validate dynamic form fields.

[Hawkes, Richard]

Just spent far too long trying to figure out how to do this, so I thought I'd
pass it on to you great guys, in case you need it for the future.
 
I used PHP to create multiple form rows, each one numbered:

?
for ($i =1; $i = 20; $i++) {
echo(input type=text name=userId$i maxlength=5/br/);
}
?

This creates a number of rows, each with a unique form value name. The problem
I had was that I needed to validate those rows, to make sure they were
numeric... Here's what I did. Have fun!
 
?php
$numRows = 20;
?
html
head
titleUser ID Entry Example/title
script language=JavaScript
function isNumeric(strString)
{
var strValidChars = 0123456789-.;
var strChar;
var blnResult = true;
 
if (strString.length == 0) return false;
 
//  test strString consists of valid characters listed above
for (i = 0; i  strString.length  blnResult == true; i++)
{
strChar = strString.charAt(i);
if (strValidChars.indexOf(strChar) == -1)
{
blnResult = false;
}
}
return blnResult;
}
 
 
function validateForm()
{
for (var i = 1; i = ?= $numRows ?; i++)
{
var fieldName = 'UserId' + i;
var fieldValue =
document.forms.userForm.elements[fieldName].value;
if (fieldValue != ''  ! isNumeric(fieldValue))
{
alert(Field value in row  + i +  ( + fieldValue + ) is
not numeric.);
return false;
}
}
return true;
}
/script
/head
body
form name=userForm action=process_form.php method=post onSubmit=return
validateForm()
?php
  for ($i =1; $i = $numRows; $i++) {
echo(input type=text name=userId$i maxlength=5/br/);
  }
?
/form
/body
/html

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Re: [PHP] For your reference, how to validate dynamic form fields.

[holmes072000]

 From: Hawkes, Richard [EMAIL PROTECTED]
 
 Just spent far too long trying to figure out how to do this, so I thought I'd
 pass it on to you great guys, in case you need it for the future.
  
 I used PHP to create multiple form rows, each one numbered:
 
 ?
 for ($i =1; $i = 20; $i++) {
 echo(input type=text name=userId$i maxlength=5/br/);
 }
 ?

Use arrays. It'll make your life easier.

echo input type=\text\ name=\userId[$i]\ maxlength=\5\/br /);

You can still reference the element in Javascript, just by name or whatever you call 
it. 

form.element['userId[1]'] (or something like that).

You show a Javascript validation. Remember that this is easily bypassed so you also 
need to validate the numbers on the PHP side. 

?php
foreach($_POST['inputId'] as $id)
{
  if(!is_numeric($id))
  { echo $id is invalid!; }
}
?

---John Holmes...

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