Develop Reference

Avoid multiple form submit in html

I'm facing a sort of dummy problem.
On my site there is an order form (simple html form) and I noticed that I get double commands from time to time.
I realized that if I clicked repeatedly few times the submit button (before the action page is loaded) I got as many commands as I have clicked.
So I wonder if there are simple solution to make form submission asyncronous?
Thanks
P.S. I added JQuery UI dialog on submit "wait please..." but I get still double commands.
UPDATE
As GeoffAtkins proposed I will:
disable submit after dialog is shown
make use of unique form's token (as it is already added by Symfony) Do not use Symfony token as unique form token as it is always the same for current session. Use just random or something like that.

I would consider doing this (jQuery since you said you used that)
$(function() {
$("#formId").on("submit",function() {
$("#submitBut").hide();
$("#pleaseWait").show();
});
});
if you submit the form and reload the page.
If you Ajax the order, then do
$(function() {
$("#formId").on("submit",function(e) {
e.preventDefault();
var $theForm = $(this);
$("#submitBut").hide();
$("#pleaseWait").show();
$.post($(this).attr("action"),$(this).serialize(),function() {
$theForm.reset();
$("#submitBut").show(); // assuming you want the user to order more stuff
$("#pleaseWait").hide();
});
});
});
NOTE that disabling the submit button on click of the submit button may stop the submission all together (at least in Chrome): https://jsfiddle.net/mplungjan/xc6uc46m/

Just disable the button on click, something like:
$("#my-button-id").on("click", function() {
$(this).attr("disabled", "disabled");
});

var bool = true;
function onclick()
{
if(bool)
{
//do stuff
bool = false;
}
else
{
//ignore
}
}

You could disable the button on the form when it is clicked, and then continue to perform the action. You would probably change the text to say "loading..." or some such.
You may also want to re-enable the button on fail or complete of the ajax request.
I've done this many times similar to this: https://stackoverflow.com/a/19220576/89211

jQuery disable double click prevention breaking functionality of a PHP function in a form

I have a jquery bug that I cant solve - hoping for help with a solution. Dont know if it is browser bug related (probably not), jQuery related, or Yii (our backend) related - but I need to try to solve it with the jQuery portion. Code at bottom of message.
Requirement: Disable accidental double submissions on forms.
Current Solution: Check for form submission state through a delegate and when the DOM form state changes to submit - append the disable attribute to the form submit button to prevent accident double form submission.
jQuery double click disabler:
$( document ).ready(function() {
$('html').delegate('form', 'submit', function() {
$(this).find(':submit').attr('disabled', true);
});
});
Problem: This works perfectly on every part of the CRM we are developing EXCEPT for a single timekeeper (clock in/clock out) feature. With the timekeeper the form has two submit buttons (one for clock in, one for clock out). Only one submit button shows at a time (Either "In" or "Out". When you click the button - it submits the form and changes the submit button to the other state by checking a session var to determine what state it is in and determines which of the two submit buttons are to be displayed. Problem is if you click it, the form appears to submit, but the state don't change. If you click it really fast a few times you can get it to change state. I suspect this is a timing or order of operations issue, but I have no idea how to fix it. The fix MUST be done on the front end, so here is the code (both the PHP being impacted and jQuery double click prevention). Perhaps a different method of disabling double submissions may work, please post your solution if you have one to try. Commenting out the current jQuery allows the form to function as designed. What might be causing this, and how might I change the jQuery double click prevention to solve it?
On page PHP for the time clock:
<form action = "<?=$clockUrl?>" method = "post" >
<input type = "hidden" name = "previousUrl" value = "<?=$currentUrl?>">
<?php if ($sessionVar->timeclockin) {?>
<input type = "submit" name = "submit-clockout" value = "Out">
<class="clock-time" ><?=$sessionVar->timeclockin?></class="clock-time">
<?php } else {?>
<input type = "submit" name = "submit-clockin" value = "In">
<?php }?>
</form>

Thank you for pointing me in the right direction Tyler! I was able to fix the issue with the following alteration to my script.
function do_nothing() {
console.log("click prevented");
return false;
}
$('html').delegate('form', 'submit', function(e) {
$(e.target).find(':submit').click(do_nothing);
setTimeout(function(){
$(e.target).unbind('click', do_nothing);
}, 10000);
});

Update 1:
If you are looking to prevent the button from being pressed twice then inside of your onclick or submit function, you should use something similar to the following:
$('#yourButton').prop('disabled', true);
If the page then redirects then you won't have to undo this. If it does, then do the opposite by changing true to false.
The submit function should instead disable the submit button until it either returns or fails.
An alternative is to use a lambda style function and replace it temporarily with an empty function until the request returns or fails.

How do I reactivate an event on file input cancel?

So, I have a hidden file input, and multiple clicks open up multiple file input dialogs. So I disable them temporarily like so:
on click:
$("#file_input").click();
$(document).off(event, #parent_click);
on success, on the change event for the file input
$(document).on(event, #parent_click, clickHandler);
HOWEVER! If the user opens up the File Dialog, and then decides to not do anything, and hits cancel, the #parent_click clickHandler can never be turned on again.
How do I rectify this?

If I correctly got it, you can on .change() check for input value and if it's empty just not to fire disable
$('#yourInputId').change(function{
if($('#yourInputId').val() == ''){
//do some stuff
} else {
//do other stuff
}
})
BTW please, could you provide some fiddle next time, if it's possible, it will be much easier to find out a solution with it.
UPDATED working Fiddle

JavaScript Restrict User From Clicking Button Multiple Times

I am trying to restrict the user from clicking on a button multiple times. They can click on the button once when the page loads. If the page is reloaded the same should apply the user can click on the button only once.
I am using the following code however it doesn't seem to work for me
$("#doAccess").click(function() {
$("#doAccess").removeAttr('onclick');
DoSave();
});

Disable the button after it's been clicked
var accessBtn = $('#doAccess');
accessBtn.click(function() {
accessBtn[0].disabled = true;
DoSave();
});

Sounds like what you really need is:
$("#doAccess").one('click', DoSave);
jsFiddle example
.one() - Attach a handler to an event for the elements. The handler is executed at most once per element per event type.

Why not this?
$("#doAccess").once('click', function() {
DoSave();
});
You should probably also gray out or disable #doAccess, whatever it is.

Disable click handler when click is fired in jQuery

We have a website built in .NET and jQuery. We have custom jQuery to call the load method on a processing ASP.NET page. That ajax call is fired in a click handler, e.g.
$("#Submit").click(function(){
$(a_selector).load("Process.aspx?data=" + someDataObject, null, function(){
alert("Done")});
}
return false;
);
Our issue is when we hit the #Submit button the click is fired which calls the ajax to process it. People seem to be double-clicking the button and therefore we're getting multiple results in our database from the dual clicks. Does anyone have an idea on how to prevent this issue? I considered something like disabling the button via JS but I'd like to know of other ideas.

Use the one function of jQuery. This way, the event is only ever fired once. Of course, you should also disable the button so the user knows that clicking on it is futile. In addition, show a spinner, progress bar, or change the cursor styling to indicate to the user that something is happening and the system isn't stuck.

stop propagation
$("#Submit").click(function(event){
event.stopPropagation();
if (typeof $_submitSend == "undefined")
var $_submitSend = true;
else if ($_submitSend == true)
return false;
$_submitSend = true;
$(this).attr("disabled", "disabled");
$(a_selector).load("Process.aspx?data=" + someDataObject, null, function(){
alert("Done")});
$_submitSend = false;
$(this).removeAttr("disabled");
}
);

$("#Submit").click(function(){
$(a_selector).removeClass("class").load("Process.aspx?data=" + someDataObject, null, function(){
$(this).addClass("class");
alert("Done")});
}
return false;
);
Then just add some specific class without any styling which you will use as a selector. Dont know if it will work the way you want, but it looks like simplest solution to me... :)