当您 remove() 一个元素并在其他地方 append() 它时，jQuery 中的事件会丢失吗？

Question

What happens in jQuery when you remove() an element and append() it elsewhere?

It appears that the events are unhooked - as if you were just inserting fresh html (which I guess is what happening). But its also possible my code has a bug in it - so I just wanted to verify this behavior before I continue.

If this is the case - are there any easy ways to rehookup the events to just that portion of HTML, or a different way to move the element without losing the event in the first place.

Answer 1

The jQuery detach() function is the same as remove() but preserves the event handlers in the object that it returns. If you have to remove the item and place it somewhere else with everything you can just use this.

var objectWithEvents = $('#old').detach();
$('#new').append(objectWithEvents);

Check the API docs here: http://api.jquery.com/detach/

Answer 2

Yes, jQuery's approach with remove() is to unbind everything bound with jQuery's own bind (to prevent memory leaks).

However, if you just want to move something in the DOM, you don't have to remove() it first. Just append to your heart's content, the event bindings will stick around :)

For example, paste this into your firebug on this page:

$('li.wmd-button:eq(2)').click(function(){ alert('still here!') }).appendTo(document.body)

And now scroll down to the bottom of this page and click on the little globy icon now buried under the SO footer. You will get the alert . All because I took care to not remove it first.

Answer 3

use jQuery1.3.1 live() to bind events and you won't need to worry about this..

Update: live events are deprecated now, but you can get the same effect from $(document).on().