How do I know whether there is a specific listener on an element in jQuery?

Question

Or how do I know whether this below has been run or not:

$target.bind('click',function() {
...
});

Answer 1

You can use $._data. For example

$target.bind('click',function() {
...
});

$._data( $target[0], 'events'); // Object {click: Array[1]}

Answer 2

I use the visual event bookmarklet to show me which items have events.

Answer 3

You can access the jQuery.data object to find out:

$.fn.isBound = function() {
    return this.length && typeof $.data(this[0], 'handle') == 'function' || false;
}

if ($target.isBound()) {
    // $target has events
}

UPDATE: if you want to check for specific types you can look in the events object:

$.fn.isBound = function(type) {
    return this.length && $.data(this[0], 'events')[type] || false;
}

if ($target.isBound('click')) {
    // $target has clickevents
}

Answer 4

Borrowing from and extending David's example, use this:

if(typeof $('#id').click == 'function') {}