A function triggers an event and passes on some data which then will possibly be processed by a listener. If not, the function wants to process the data by herself. Well, as I don't know if the package was handled or not, my idea was to find out if there is a listener at all. Is there a way to do this or does anyone have better ideas to my problem?
Thanks in advance!
You can to this with jQuery prior to 1.8 like this:
<script src="http://code.jquery.com/jquery-1.6.min.js"></script>
<script>
$(document).ready(function() {
$("#click_here").click(function() {
alert("Handler for .click() called.");
});
console.log( $('#click_here').data('events') );
});
</script>
<div id="click_here">Click here</div>
I created a plugin mainly to be used in your tests.
// Example usage
$('.foo').hasEvent('click', someHandler)
// returns true if someHandler is bound via jQuery on '.foo'
// for the click event
The plugin is tested to work with jQuery 1.7 and up
I had a VERY similar problem. It's never been something that's been properly supported in jquery and instead was kind of a hack. So you could do it prior to version 1.8 in jquery by using
data('events')
After 1.8, you can use:
$._data( $('.element')[0], 'events' );
BUT if you're trying to do what I was doing... make sure an event handler is only assigned once on a control (i.e. a save button after some form validation), then you can either:
$('element').unbind('event');
$('element').on('click', save);
$(element).hasEventListener(type)?