Question

I asked about this on the jquery forum a few weeks ago without luck, so I will try again here :)

I ve made a simple widget for a project I m working on, but I have encountered an odd problem.

It is easiest to explain it with an example implementation. http://decko.dk/buttontest

On the page there are 3 button. The first one is my drop down widget. The next one is a regular disabled button (A) and the last one a regular enabled button (B). If you then refresh the page (press F5 or whatever) the enabled button is mysteriously now disabled. I have no clue why this happens, but if button A is not disabled to begin with, button B will not be disabled when refreshing. Also, if I remove the call to insertAfter in my widget-code, the button will not be disabled. Can anyone shed light on why this strange behavior occurs?

By the way, I have only been able to reproduce this in Firefox.

Answer 1

I believe this is a bug in how Firefox remembers form field/control values and states:

After the first page load, there are three <button> elements in the document, and <button id="button_a"> is disabled. (When the jQuery UI styled button is enabled or disabled, it sets the underlying element to the same state.)
Firefox remembers that the second <button> is disabled.
After a page refresh, before any scripts are run, Firefox restores form fields and controls. It disables the second <button>, but since no script has been run, the second button is <button id="button_b">.
When jQuery UI creates the styled button for <button id="button_b">, it sees that it is disabled and continues to style it as disabled.

There are two issues here:

How Firefox remembers which elements are disabled. It s not taking into account dynamic elements. I suggest filing a bug with Mozilla for this.
Form elements stay disabled after a page refresh. I m not sure if this is the correct behaviour, but there are two bugzilla reports on this.

The test case can simplify down to just adding a <button> element dynamically and disabling <button id="button_a">, no jQuery / jQuery UI necessary:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    <title>disabled button test</title>
    <script type="text/javascript">
    window.onload = function () {
        var a = document.getElementById( button_a ),
            menu = document.createElement( button );
        menu.appendChild(document.createTextNode( Menu ));
        document.body.insertBefore(menu, a);
        a.disabled = true;
    };
    </script>
</head>
<body>
    <button id="button_a">A</button>
    <button id="button_b">B</button>
</body>
</html>

Answer 2

I ve been getting this problem also and worked out it was down to silly behaviour in firefox, my fix was as so:

before:

//set up the buttons
$("button").button();

after:

//set up the buttons (and make sure firefox behaves)
$("button").button().attr("autocomplete", "off");

Answer 3

Setting the Expires HTTP header to a date in the past, solved the problem for me in Firefox 6.0.

Answer 4

Here is the solution I found works really well in all browsers...

I give each button (that can be disabled) a class js_submit

I then re-enable any disabled buttons with class js_submit on the pagehide event that fires when a page is unloaded.

I wrap the event assignment inside a try catch to prevent browsers that don t support this event from throwing an error (such as IE).

Here is the code:

<input id="button" type="button" value="Submit" class="js_submit" />


// Fix for firefox bfcache:
try {
    window.addEventListener( pagehide , PageHideHandler, false);
} catch (e) { }

//Fires when a page is unloaded:
function PageHideHandler() {
    //re-enable disabled submit buttons:
    $( .js_submit ).attr( disabled , false);
}

Answer 5

In my case it was a Bootstrap bug

<input id="appointmentBtn" type="button" 
ng-click="addAppointment()" class="btn btn-primary btn-xs 
disabled" value="Add Appointment">

Instead it should have been

<input id="appointmentBtn" type="button" 
ng-click="addAppointment()" class="btn-primary btn-xs 
disabled" value="Add Appointment">

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