Jquery UI button gets disabled on refresh
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 explai开发者_JAVA百科n 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.
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>
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");
Setting the Expires HTTP header to a date in the past, solved the problem for me in Firefox 6.0.
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);
}
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">
加载中,请稍侯......
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