Re: [PHP] Double click problem [SOLVED]
tedd wrote: Hi gang: This is probably trivial for most of you, but here's my solution to the problem I presented earlier. The problem was, I just wanted to be certain that if a use clicked a button that they could only do it once. Sounds simple enough, huh? Certainly, one can use javascript, but I wanted something that was basic php and html -- here's my solution with code (please provide critical review): I had been tracking an intermittent bug for some considerable time and having finally identified the underlying problem - double click sends the page request twice, but the second request is processed before first has updated things! We have tightened up the server end as much as possible, but not eliminated the problem. The javascript solution is the only reliable one that I've found but some sites do not allow it to be enabled. Since having finally identified the source of the problem, we have improved education and can now 'spot' a double clicker who in many cases does not even know they are doing it! People get so used TO double clicking things on the desktop :( But in some case we suspect that the BROWSER send two requests perhaps because of a noisy keyboard! On one site that we pinned down to a particular counter position, changing the keyboard fixed the problem ( enter was pressing the button ). Just a word of warning that may explain the occasional double order ;) -- Lester Caine - G8HFL - Contact - http://home.lsces.co.uk/lsces/wiki/?page=contact L.S.Caine Electronic Services - http://home.lsces.co.uk EnquirySolve - http://enquirysolve.com/ Model Engineers Digital Workshop - http://medw.co.uk// Firebird - http://www.firebirdsql.org/index.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Double click problem [SOLVED]
At 4:23 PM -0700 3/21/08, Jim Lucas wrote: It would require a little JS, but you could use the onUnload feature and pop up a warning that would tell them the problem(s) of leaving this page. Then use the confirm() method from JS to either allow or deny them to leave the current page. I don't know if you can limit this action to only take affect when they press the back button, but it might help in any event. Jim: I tried that. The problem is that you'll get that notice if the user submits the form as well. IOW, no matter what the user does, as soon as they leave that page they get the notice. I might be able to put a hidden input field to cancel the notice, but like everything -- one thing leads to another. Thanks, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Double click problem [SOLVED]
At 7:21 AM + 3/22/08, Lester Caine wrote: tedd wrote: Hi gang: This is probably trivial for most of you, but here's my solution to the problem I presented earlier. The problem was, I just wanted to be certain that if a use clicked a button that they could only do it once. Sounds simple enough, huh? Certainly, one can use javascript, but I wanted something that was basic php and html -- here's my solution with code (please provide critical review): I had been tracking an intermittent bug for some considerable time and having finally identified the underlying problem - double click sends the page request twice, but the second request is processed before first has updated things! We have tightened up the server end as much as possible, but not eliminated the problem. The javascript solution is the only reliable one that I've found but some sites do not allow it to be enabled. Since having finally identified the source of the problem, we have improved education and can now 'spot' a double clicker who in many cases does not even know they are doing it! People get so used TO double clicking things on the desktop :( But in some case we suspect that the BROWSER send two requests perhaps because of a noisy keyboard! On one site that we pinned down to a particular counter position, changing the keyboard fixed the problem ( enter was pressing the button ). Just a word of warning that may explain the occasional double order ;) -- Lester Caine - G8HFL Well that sounds good enough reason to use javascript. I'll add that too. Thanks, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Double click problem [SOLVED]
Hi gang: This is probably trivial for most of you, but here's my solution to the problem I presented earlier. The problem was, I just wanted to be certain that if a use clicked a button that they could only do it once. Sounds simple enough, huh? Certainly, one can use javascript, but I wanted something that was basic php and html -- here's my solution with code (please provide critical review): http://www.webbytedd.com/cc/submit-once/index.php If the user clicks Submit once, then that's the way it is until they quit their browser. If they don't quit their browser, then no amount of refresh will allow them to click the button again. The Reset Submit, of course, resets this condition but it's for demo purposes. What I have not solved, and I don't think there is a solution (I could be wrong) is to prohibit the user from clicking the back button on their browser to reset this condition. I've done a considerable amount of javascript reading, testing, and code search and have not found anything that works -- and -- I have even found places where the js community says that nothing will work to solve the back-button problem. So, does anyone here know better? If so, please start a different thread. Cheers, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Double click problem [SOLVED]
On Fri, Mar 21, 2008 at 2:24 PM, tedd [EMAIL PROTECTED] wrote: Hi gang: This is probably trivial for most of you, but here's my solution to the problem I presented earlier. The problem was, I just wanted to be certain that if a use clicked a button that they could only do it once. Sounds simple enough, huh? Certainly, one can use javascript, but I wanted something that was basic php and html -- here's my solution with code (please provide critical review): http://www.webbytedd.com/cc/submit-once/index.php If the user clicks Submit once, then that's the way it is until they quit their browser. If they don't quit their browser, then no amount of refresh will allow them to click the button again. The Reset Submit, of course, resets this condition but it's for demo purposes. What I have not solved, and I don't think there is a solution (I could be wrong) is to prohibit the user from clicking the back button on their browser to reset this condition. I've done a considerable amount of javascript reading, testing, and code search and have not found anything that works -- and -- I have even found places where the js community says that nothing will work to solve the back-button problem. So, does anyone here know better? If so, please start a different thread. Cheers, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php Tedd, Web pages are supposed to be stateless. Therefore it is your burden to deal with the back button because each URI should be able to be requested in any order at any time with or without sessions. Just because a shopping cart has a checkout.php page that requires certain steps doesn't mean that Google can't stumble upon it and index it to try and hit it over and over. So the real question is why is clicking the back button so terrible? Your workflow might be like this: form create crumb and hide in token field store in session if (post) re-show form with error message from gateway show payment form submit will post to processing processing: validate post token == session token, if not then re-display payment form via require w/ error message if payment declined then re-display payment form via require w/ error message if payment accepted then save order, clear cart, and say thank you If I am on the form and I click process, then it posts to processing and does some stuff. If somehow I am fast enough to click the back button you think there might be an issue of the card transaction being sent to the merchant but the results not returned? If that is the case, on the processing page do this: - set a session variable saying you have started card processing - use ignore_user_abort - continue as normal then on the form page - check for started card processing session existance, if it exists then say please wait a moment and refresh again or however you want to handle that. - continue as normal The web is stateless and we're always going to have to deal with that. Just make everyone play by your rules. BTW Javascript is just fluff, a convenience for the end user. Your script should work perfectly without it because googlebot snooping around will not have it and also any of those rogue spam scripts will also not have it. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Double click problem [SOLVED]
tedd wrote: Hi gang: This is probably trivial for most of you, but here's my solution to the problem I presented earlier. The problem was, I just wanted to be certain that if a use clicked a button that they could only do it once. Sounds simple enough, huh? Certainly, one can use javascript, but I wanted something that was basic php and html -- here's my solution with code (please provide critical review): http://www.webbytedd.com/cc/submit-once/index.php If the user clicks Submit once, then that's the way it is until they quit their browser. If they don't quit their browser, then no amount of refresh will allow them to click the button again. The Reset Submit, of course, resets this condition but it's for demo purposes. What I have not solved, and I don't think there is a solution (I could be wrong) is to prohibit the user from clicking the back button on their browser to reset this condition. I've done a considerable amount of javascript reading, testing, and code search and have not found anything that works -- and -- I have even found places where the js community says that nothing will work to solve the back-button problem. So, does anyone here know better? If so, please start a different thread. Cheers, tedd It would require a little JS, but you could use the onUnload feature and pop up a warning that would tell them the problem(s) of leaving this page. Then use the confirm() method from JS to either allow or deny them to leave the current page. I don't know if you can limit this action to only take affect when they press the back button, but it might help in any event. -- Jim Lucas Some men are born to greatness, some achieve greatness, and some have greatness thrust upon them. Twelfth Night, Act II, Scene V by William Shakespeare -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Double click problem
the way I solved the click back button issue (simplified vresion):
confirmation page (conf.php) - transfer page (tp.php) - thank you page
(typ.php)
#conf.php
# after the form is submitted and confirmed
header('location: tp.php?url=typ.php');
exit;
#tp.php
header('location:$_GET['url']);
exit;
and, if visitor clicks on back button on thakyou page he will go actually to
the transfer page - which will send him back to thankyou page
;)
-ll
- Original Message
From: tedd [EMAIL PROTECTED]
To: php-general@lists.php.net
Sent: Wednesday, March 19, 2008 11:43:06 AM
Subject: Re: [PHP] Double click problem
At 4:19 PM + 3/19/08, Richard Heyes wrote:
tedd wrote:
// ...
Your first (and the quickest by far) method to employ would be to
disable the submit button using Jabbascript when the form is
submitted. That will stop the vast majority of occurrences. You
could also employ an intermediary page which actually does the card
processing and when complete redirects to the thank you page. ie.
Form -- Please wait... page -- Thank you page
That's in place. The person clicks the confirm purchase and they
are taken to a confirm and thank you page.
The problem here is two fold -- 1) clicking the confirm
purchasebutton twice, which I think js will stop; 2) and clicking
the back-button which the token should stop.
Now, I just need to develop a test for this. Sometime writing a test
is more of a problem than writing the solution.
Thanks for everyone's help.
Cheers,
tedd
--
---
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Re: [PHP] Double click problem
On Thu, Mar 20, 2008 at 10:39 AM, Lamp Lists [EMAIL PROTECTED] wrote:
the way I solved the click back button issue (simplified vresion):
confirmation page (conf.php) - transfer page (tp.php) - thank you page
(typ.php)
#conf.php
# after the form is submitted and confirmed
header('location: tp.php?url=typ.php');
exit;
#tp.php
header('location:$_GET['url']);
exit;
and, if visitor clicks on back button on thakyou page he will go actually to
the transfer page - which will send him back to thankyou page
;)
-ll
- Original Message
From: tedd [EMAIL PROTECTED]
To: php-general@lists.php.net
Sent: Wednesday, March 19, 2008 11:43:06 AM
Subject: Re: [PHP] Double click problem
At 4:19 PM + 3/19/08, Richard Heyes wrote:
tedd wrote:
// ...
Your first (and the quickest by far) method to employ would be to
disable the submit button using Jabbascript when the form is
submitted. That will stop the vast majority of occurrences. You
could also employ an intermediary page which actually does the card
processing and when complete redirects to the thank you page. ie.
Form -- Please wait... page -- Thank you page
That's in place. The person clicks the confirm purchase and they
are taken to a confirm and thank you page.
The problem here is two fold -- 1) clicking the confirm
purchasebutton twice, which I think js will stop; 2) and clicking
the back-button which the token should stop.
Now, I just need to develop a test for this. Sometime writing a test
is more of a problem than writing the solution.
Thanks for everyone's help.
Cheers,
tedd
--
---
http://sperling.com http://ancientstones.com http://earthstones.com
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Allowing unscrubbed user data in a header is a really bad idea.
- http://en.wikipedia.org/wiki/HTTP_response_splitting
- http://www.owasp.org/index.php/Open_redirect
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Re: [PHP] Double click problem
- Original Message
From: Eric Butera [EMAIL PROTECTED]
To: Lamp Lists [EMAIL PROTECTED]
Cc: tedd [EMAIL PROTECTED]; php-general@lists.php.net
Sent: Thursday, March 20, 2008 11:00:19 AM
Subject: Re: [PHP] Double click problem
On Thu, Mar 20, 2008 at 10:39 AM, Lamp Lists [EMAIL PROTECTED] wrote:
the way I solved the click back button issue (simplified vresion):
confirmation page (conf.php) - transfer page (tp.php) - thank you page
(typ.php)
#conf.php
# after the form is submitted and confirmed
header('location: tp.php?url=typ.php');
exit;
#tp.php
header('location:$_GET['url']);
exit;
and, if visitor clicks on back button on thakyou page he will go actually to
the transfer page - which will send him back to thankyou page
;)
-ll
- Original Message
From: tedd [EMAIL PROTECTED]
To: php-general@lists.php.net
Sent: Wednesday, March 19, 2008 11:43:06 AM
Subject: Re: [PHP] Double click problem
At 4:19 PM + 3/19/08, Richard Heyes wrote:
tedd wrote:
// ...
Your first (and the quickest by far) method to employ would be to
disable the submit button using Jabbascript when the form is
submitted. That will stop the vast majority of occurrences. You
could also employ an intermediary page which actually does the card
processing and when complete redirects to the thank you page. ie.
Form -- Please wait... page -- Thank you page
That's in place. The person clicks the confirm purchase and they
are taken to a confirm and thank you page.
The problem here is two fold -- 1) clicking the confirm
purchasebutton twice, which I think js will stop; 2) and clicking
the back-button which the token should stop.
Now, I just need to develop a test for this. Sometime writing a test
is more of a problem than writing the solution.
Thanks for everyone's help.
Cheers,
tedd
--
---
http://sperling.com http://ancientstones.com http://earthstones.com
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To unsubscribe, visit: http://www.php.net/unsub.php
Looking for last minute shopping deals?
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http://tools.search.yahoo.com/newsearch/category.php?category=shopping
Allowing unscrubbed user data in a header is a really bad idea.
- http://en.wikipedia.org/wiki/HTTP_response_splitting
- http://www.owasp.org/index.php/Open_redirect
I agree with you to use exactly this way is bad idea.
But, as I said on the begining of my post it's simplified version, to get my
point. My code on tp.php actually use sveral validations before forward to
thank you page :D
-ll
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Re: [PHP] Double click problem
On Wed, Mar 19, 2008 at 11:48 AM, tedd [EMAIL PROTECTED] wrote: In the last step in the process, the user clicks a confirm purchase button and their credit card is checked and if it's valid, they are awarded the product. Everything works, but it takes a little time to check the credit card. During the time it takes to send the credit card information to the clearing house and get back an Ok with a transaction ID, the user can click the confirm purchase button more than once. As such, more than one order can be made during the process. I was thinking of using the database to prohibit multiple confirm purchase clicks made by the user, but I wanted to ask this group if anyone has a simpler idea/solution? I had a similar problem with one of our applications here. I ended up adding some javascript to disable the button once clicked, and then putting in code in the php to prevent duplicates. It seemed to do the trick. I can send over some sample code if you need. For the javascript I just made the submit button hit a function, disable the button, then submit the form. -- -Dan Joseph Build a man a fire, and he will be warm for the rest of the day. Light a man on fire, and will be warm for the rest of his life.
Re: [PHP] Double click problem
tedd wrote: I have a situation where users can purchase stuff online. In the last step in the process, the user clicks a confirm purchase button and their credit card is checked and if it's valid, they are awarded the product. Everything works, but it takes a little time to check the credit card. During the time it takes to send the credit card information to the clearing house and get back an Ok with a transaction ID, the user can click the confirm purchase button more than once. As such, more than one order can be made during the process. I was thinking of using the database to prohibit multiple confirm purchase clicks made by the user, but I wanted to ask this group if anyone has a simpler idea/solution? In the onclick for the button... onclick=this.disabled=1;this.value='Processing, please wait...'; You can also do this in the onsubmit of the form but you obviously need to change this to a document.getElementById. I'd also recommend you put some JS at the end of the page to enable the button and set its value otherwise users hitting the back button may be presented with a disabled button which is annoying. -Stut -- http://stut.net/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] Double click problem
Hi gang: I have a situation where users can purchase stuff online. In the last step in the process, the user clicks a confirm purchase button and their credit card is checked and if it's valid, they are awarded the product. Everything works, but it takes a little time to check the credit card. During the time it takes to send the credit card information to the clearing house and get back an Ok with a transaction ID, the user can click the confirm purchase button more than once. As such, more than one order can be made during the process. I was thinking of using the database to prohibit multiple confirm purchase clicks made by the user, but I wanted to ask this group if anyone has a simpler idea/solution? Thanks, tedd How about a bit of JavaScript that disabled the button when the form was submitted? This is used by eBay and Google for their login processes. Sure, if JS was disabled this could be circumvented but it would be a good start and work with the majority of users. Edward -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] Double click problem
Hi gang: I have a situation where users can purchase stuff online. In the last step in the process, the user clicks a confirm purchase button and their credit card is checked and if it's valid, they are awarded the product. Everything works, but it takes a little time to check the credit card. During the time it takes to send the credit card information to the clearing house and get back an Ok with a transaction ID, the user can click the confirm purchase button more than once. As such, more than one order can be made during the process. I was thinking of using the database to prohibit multiple confirm purchase clicks made by the user, but I wanted to ask this group if anyone has a simpler idea/solution? Thanks, tedd Oh, I'd also add a bit of text near the button saying: Please click this button ONCE only. Clicking again may result in your credit card being billed twice. I'm always much more precise with my clicking when such warnings are displayed :) Edward -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Double click problem
On Wed, Mar 19, 2008 at 11:48 AM, tedd [EMAIL PROTECTED] wrote: Hi gang: I have a situation where users can purchase stuff online. In the last step in the process, the user clicks a confirm purchase button and their credit card is checked and if it's valid, they are awarded the product. Everything works, but it takes a little time to check the credit card. During the time it takes to send the credit card information to the clearing house and get back an Ok with a transaction ID, the user can click the confirm purchase button more than once. As such, more than one order can be made during the process. I was thinking of using the database to prohibit multiple confirm purchase clicks made by the user, but I wanted to ask this group if anyone has a simpler idea/solution? Thanks, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php Unique form tokens. Generate a token when the form is displayed and save that value in the session. Then on post check it and remove it. Then if they re-submit it will not exist therefore be invalid. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Double click problem
On Wed, Mar 19, 2008 at 11:48 AM, tedd [EMAIL PROTECTED] wrote: Hi gang: I have a situation where users can purchase stuff online. In the last step in the process, the user clicks a confirm purchase button and their credit card is checked and if it's valid, they are awarded the product. Everything works, but it takes a little time to check the credit card. During the time it takes to send the credit card information to the clearing house and get back an Ok with a transaction ID, the user can click the confirm purchase button more than once. As such, more than one order can be made during the process. I'd use a JavaScript onClick event to disable the button, but I'd back it up with a timestamp tracker to compare clicks of the button. If someone clicks the button and, for whatever reason, the script times-out, they'll probably try to order again. No sweat. The timestamp tracker can verify that the order was not successful within (n) (duration), and if one is found within said duration, the user is shown a message stating that their order has already been processed, with an option to purchase the item again if that was their intent. If there wasn't a successful response from the payment processor, the timestamp isn't recorded, and the purchase can go through as expected. -- /Daniel P. Brown Forensic Services, Senior Unix Engineer 1+ (570-) 362-0283 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Double click problem
On Wed, Mar 19, 2008 at 12:01 PM, Eric Butera [EMAIL PROTECTED] wrote: Unique form tokens. Generate a token when the form is displayed and save that value in the session. Then on post check it and remove it. Then if they re-submit it will not exist therefore be invalid. I like Eric's method better than the timestamp method I proposed. Much cleaner and easier to institute, and I'd hazard a guess at it being more reliable as well. -- /Daniel P. Brown Forensic Services, Senior Unix Engineer 1+ (570-) 362-0283 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] Double click problem
At 4:00 PM + 3/19/08, Edward Kay wrote: Oh, I'd also add a bit of text near the button saying: Please click this button ONCE only. Clicking again may result in your credit card being billed twice. I'm always much more precise with my clicking when such warnings are displayed :) That's already in place. But people have a hard time reading when their fingers are clicking. Cheers, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Double click problem
tedd wrote: // ... Your first (and the quickest by far) method to employ would be to disable the submit button using Jabbascript when the form is submitted. That will stop the vast majority of occurrences. You could also employ an intermediary page which actually does the card processing and when complete redirects to the thank you page. ie. Form -- Please wait... page -- Thank you page -- Richard Heyes Employ me: http://www.phpguru.org/cv -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Double click problem
At 4:19 PM + 3/19/08, Richard Heyes wrote: tedd wrote: // ... Your first (and the quickest by far) method to employ would be to disable the submit button using Jabbascript when the form is submitted. That will stop the vast majority of occurrences. You could also employ an intermediary page which actually does the card processing and when complete redirects to the thank you page. ie. Form -- Please wait... page -- Thank you page That's in place. The person clicks the confirm purchase and they are taken to a confirm and thank you page. The problem here is two fold -- 1) clicking the confirm purchasebutton twice, which I think js will stop; 2) and clicking the back-button which the token should stop. Now, I just need to develop a test for this. Sometime writing a test is more of a problem than writing the solution. Thanks for everyone's help. Cheers, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Double click problem
Daniel Brown wrote: On Wed, Mar 19, 2008 at 12:01 PM, Eric Butera [EMAIL PROTECTED] wrote: Unique form tokens. Generate a token when the form is displayed and save that value in the session. Then on post check it and remove it. Then if they re-submit it will not exist therefore be invalid. I like Eric's method better than the timestamp method I proposed. Much cleaner and easier to institute, and I'd hazard a guess at it being more reliable as well. The initial problem that I see with it would be that if the user clicks the submit button a second time, the first transaction is canceled. If the process takes a long time, maybe the time period for the server to get the approval has already passed, but the server is still doing stuff but not redirected the person to the success page. At this point, the user has purchased the item successfully, but they did see the success page. So they repeat the process, over and over and over... That is a situation that I can envision at least. My suggestion would be to disable the submit button. This would prevent the first transaction from being killed prematurely. -- Jim Lucas Some men are born to greatness, some achieve greatness, and some have greatness thrust upon them. Twelfth Night, Act II, Scene V by William Shakespeare -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Double click problem
On Wed, Mar 19, 2008 at 12:44 PM, Jim Lucas [EMAIL PROTECTED] wrote: Daniel Brown wrote: I like Eric's method better than the timestamp method I proposed. Much cleaner and easier to institute, and I'd hazard a guess at it being more reliable as well. The initial problem that I see with it would be that if the user clicks the submit button a second time, the first transaction is canceled. If the process takes a long time, maybe the time period for the server to get the approval has already passed, but the server is still doing stuff but not redirected the person to the success page. At this point, the user has purchased the item successfully, but they did see the success page. So they repeat the process, over and over and over... Right, but I meant that as a replacement to my backup solution. As a backup for disabling the button using JavaScript, as mentioned. Sorry, should've clarified that. Good catch, Jim. -- /Daniel P. Brown Forensic Services, Senior Unix Engineer 1+ (570-) 362-0283 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Double Click
A tactic I've been planning to use, but don't know if it actually works or
not, is to disable the button first thing in its onClick so the second
click
occurs on a disabled button. Does anybody know if this actually works or
not?
- Theo
How do you determine if the click is the first time, when user send form,
decide to go back to previous page using browser's back button? It's
impossible to determine the click is the first or not using JavaScript.
(It's only works browser does not send form data immediately and it allow
users to send form data while it is sending form data or waiting response
from server. Is this what you want to prevent? Then it works.)
John's uses hash to compare posted values are the same as in DB, it works.
In many cases, it may be a preferred way. If you are just worried about
sending form data multiple times using browser's back button, you can do as
follows using session var.
switch ($task) {
case 'update':
if ($HTTP_SESSION_VAR['FORM_DATA_SENT']==false) {
// do update
}
$HTTP_SESSION_VAR['FORM_DATA_SENT'] = true;
break;
case 'show_form':
$HTTP_SESSION_VAR['FORM_DATA_SENT'] = false;
// show form
break;
}
Regards,
Yasuo Ohgaki
-Original Message-
From: John Huggins [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, February 28, 2001 3:04 PM
To: Manuel Lemos; [EMAIL PROTECTED]
Subject: RE: [PHP] Double Click
If you are lucky and are feeding this form data to a database, you can
create a unique hash field from other fields that would not change from
click 1 to click 2. Then just make the database treat the hash as a
unique
index and it should prevent double entries. Works for me.
Other advice is to not tell the double clicker that had an error; Just
silently ignore their second request.
-Original Message-
From: Manuel Lemos [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, February 28, 2001 2:55 PM
To: [EMAIL PROTECTED]
Subject: Re: [PHP] Double Click
Hello Fabian,
On 28-Feb-01 03:01:02, you wrote:
Hi,
I have a page, and when I have to add a product I use a form,
many people are
used to make double click in every task, so when the product is
sent with a
double click in the send button, the program send it twice to
the data base.
What can I do to prevent this?
You may want to try this forms generation class that lets you define a
warning message that shows when the user attempts to submit a form more
than once.
http://phpclasses.UpperDesign.com/browse.html/package/1
Regards,
Manuel Lemos
Web Programming Components using PHP Classes.
Look at: http://phpclasses.UpperDesign.com/?[EMAIL PROTECTED]
--
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RE: [PHP] Double Click
A tactic I've been planning to use, but don't know if it actually works or not, is to disable the button first thing in its onClick so the second click occurs on a disabled button. Does anybody know if this actually works or not? - Theo -Original Message- From: John Huggins [mailto:[EMAIL PROTECTED]] Sent: Wednesday, February 28, 2001 3:04 PM To: Manuel Lemos; [EMAIL PROTECTED] Subject: RE: [PHP] Double Click If you are lucky and are feeding this form data to a database, you can create a unique hash field from other fields that would not change from click 1 to click 2. Then just make the database treat the hash as a unique index and it should prevent double entries. Works for me. Other advice is to not tell the double clicker that had an error; Just silently ignore their second request. -Original Message- From: Manuel Lemos [mailto:[EMAIL PROTECTED]] Sent: Wednesday, February 28, 2001 2:55 PM To: [EMAIL PROTECTED] Subject: Re: [PHP] Double Click Hello Fabian, On 28-Feb-01 03:01:02, you wrote: Hi, I have a page, and when I have to add a product I use a form, many people are used to make double click in every task, so when the product is sent with a double click in the send button, the program send it twice to the data base. What can I do to prevent this? You may want to try this forms generation class that lets you define a warning message that shows when the user attempts to submit a form more than once. http://phpclasses.UpperDesign.com/browse.html/package/1 Regards, Manuel Lemos Web Programming Components using PHP Classes. Look at: http://phpclasses.UpperDesign.com/?[EMAIL PROTECTED] -- E-mail: [EMAIL PROTECTED] URL: http://www.mlemos.e-na.net/ PGP key: http://www.mlemos.e-na.net/ManuelLemos.pgp -- -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] Double Click
On Thursday 01 March 2001 21:41, Brinkman, Theodore wrote:
A tactic I've been planning to use, but don't know if it actually works or
not, is to disable the button first thing in its onClick so the second
click occurs on a disabled button. Does anybody know if this actually
works or not?
script language="javascript"
!--
var submitpressed;
submitpressed=0;
function submitcheck()
{
if(submitpressed)
return false;
submitpressed=1;
return true;
}
//--
/script
input type=button value="Submit" onClick="return submitcheck();"
- Theo
-Original Message-
From: John Huggins [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, February 28, 2001 3:04 PM
To: Manuel Lemos; [EMAIL PROTECTED]
Subject: RE: [PHP] Double Click
If you are lucky and are feeding this form data to a database, you can
create a unique hash field from other fields that would not change from
click 1 to click 2. Then just make the database treat the hash as a
unique index and it should prevent double entries. Works for me.
Other advice is to not tell the double clicker that had an error; Just
silently ignore their second request.
-Original Message-
From: Manuel Lemos [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, February 28, 2001 2:55 PM
To: [EMAIL PROTECTED]
Subject: Re: [PHP] Double Click
Hello Fabian,
On 28-Feb-01 03:01:02, you wrote:
Hi,
I have a page, and when I have to add a product I use a form,
many people are
used to make double click in every task, so when the product is
sent with a
double click in the send button, the program send it twice to
the data base.
What can I do to prevent this?
You may want to try this forms generation class that lets you define a
warning message that shows when the user attempts to submit a form more
than once.
http://phpclasses.UpperDesign.com/browse.html/package/1
Regards,
Manuel Lemos
Web Programming Components using PHP Classes.
Look at: http://phpclasses.UpperDesign.com/?[EMAIL PROTECTED]
--
E-mail: [EMAIL PROTECTED]
URL: http://www.mlemos.e-na.net/
PGP key: http://www.mlemos.e-na.net/ManuelLemos.pgp
--
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, e-mail: [EMAIL PROTECTED]
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To contact the list administrators, e-mail: [EMAIL PROTECTED]
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RE: [PHP] Double Click
Use something like this
script language="JavaScript"
var submitcount=0;
function checkSubmit(s)
if (submitcount == 0)
{
submitcount++;
s.value = " Sending... ";
return true;
}
else
{
alert("This form has already been submitted. Thanks!");
return false;
}
}
/script
input type="button" value="Proceed" name="send" onClick="if
(checkSubmit(this.form.send)) this.form.submit();"
And of course you should verify the id field in tha data base as Joe said.
Ovidiu
-Original Message-
From: Fabian Fabela [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, February 28, 2001 8:16 AM
To: [EMAIL PROTECTED]
Subject: [PHP] Double Click
Hi,
I have a page, and when I have to add a product I use a form, many people
are used to make double click in every task, so when the product is sent
with a double click in the send button, the program send it twice to the
data base.
What can I do to prevent this?
Thank you.
Fabian Fabela
[EMAIL PROTECTED]
www.vacagorda.com
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PHP General Mailing List (http://www.php.net/)
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] Double Click
Hello Fabian, On 28-Feb-01 03:01:02, you wrote: Hi, I have a page, and when I have to add a product I use a form, many people are used to make double click in every task, so when the product is sent with a double click in the send button, the program send it twice to the data base. What can I do to prevent this? You may want to try this forms generation class that lets you define a warning message that shows when the user attempts to submit a form more than once. http://phpclasses.UpperDesign.com/browse.html/package/1 Regards, Manuel Lemos Web Programming Components using PHP Classes. Look at: http://phpclasses.UpperDesign.com/?[EMAIL PROTECTED] -- E-mail: [EMAIL PROTECTED] URL: http://www.mlemos.e-na.net/ PGP key: http://www.mlemos.e-na.net/ManuelLemos.pgp -- -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP] Double Click
If you are lucky and are feeding this form data to a database, you can create a unique hash field from other fields that would not change from click 1 to click 2. Then just make the database treat the hash as a unique index and it should prevent double entries. Works for me. Other advice is to not tell the double clicker that had an error; Just silently ignore their second request. -Original Message- From: Manuel Lemos [mailto:[EMAIL PROTECTED]] Sent: Wednesday, February 28, 2001 2:55 PM To: [EMAIL PROTECTED] Subject: Re: [PHP] Double Click Hello Fabian, On 28-Feb-01 03:01:02, you wrote: Hi, I have a page, and when I have to add a product I use a form, many people are used to make double click in every task, so when the product is sent with a double click in the send button, the program send it twice to the data base. What can I do to prevent this? You may want to try this forms generation class that lets you define a warning message that shows when the user attempts to submit a form more than once. http://phpclasses.UpperDesign.com/browse.html/package/1 Regards, Manuel Lemos Web Programming Components using PHP Classes. Look at: http://phpclasses.UpperDesign.com/?[EMAIL PROTECTED] -- E-mail: [EMAIL PROTECTED] URL: http://www.mlemos.e-na.net/ PGP key: http://www.mlemos.e-na.net/ManuelLemos.pgp -- -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] Double Click
Make the id field on the db entry unique - the second query will fail. You should also be doing error checking on whether or not the record exists already. --Joe On Wed, Feb 28, 2001 at 12:15:38AM -0600, Fabian Fabela wrote: Hi, I have a page, and when I have to add a product I use a form, many people are used to make double click in every task, so when the product is sent with a double click in the send button, the program send it twice to the data base. What can I do to prevent this? Thank you. Fabian Fabela [EMAIL PROTECTED] www.vacagorda.com -- --- Joe Stump, PHP Hacker, [EMAIL PROTECTED] -o) http://www.miester.org http://www.care2.com /\\ "It's not enough to succeed. Everyone else must fail" -- Larry Ellison _\_V --- -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
