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to know if handler attached already

in Getting Started • 11 years ago

$('#foo').bind('click', fnhandler);

 function fnhandler() { alert('User clicked on "foo."'); }

how to know if a handler already attached or not?

edit: or do I do unbind and bind every time to avoid multiple.

Replies(5)

John Chac..

Re: to know if handler attached already

11 years ago

is this the best way...

My requirement was to listen to browser resize and postion/resize some elements (custom plugins)..

Calling _listenBrowserResize() on init of each elements.

2. function _listenBrowserResize() {
3. var _binded = false;
4. if ($(window).data("events")) {
5. $.each($(window).data("events"), function (i, event) {
6. if (i == 'resize') {
7. $.each(event, function (j, h) {
8. if (h.handler.name == "_resizeHandler") {
9. _binded = true;
10. }
11. });
12. }
13. });
14. }
17. function _resizeHandler() {
18. //code
19. }
20. if (!_binded) {
21. $(window).bind('resize', _resizeHandler);
22. }
23. }

Any better ideas?

jakecigar

Re: to know if handler attached already

11 years ago

$('#foo').unbind('click',fnhandler).bind('click', fnhandler);

If it wasn’t bind’ed already, it just skips that part. It’s very safe.

Burrowing into the depths of jQuery may bite you back at the next version.

JΛ̊KE

John Chac..

Re: to know if handler attached already

11 years ago

thanks for the reply....

I am listening to window resize...

$(window).unbind('resize', _resizeHandler).bind('resize', _resizeHandler);

and it keeps on binding handler to resize...

i am doing console.log($(window).data("events")) can see multiple...

Pls see attached screenshot

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window events.JPG
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jakecigar

Re: to know if handler attached already

11 years ago

You can also use namespaced binds, which enable you to remove binded events without the function having to match.

Namespaced Events - jQuery JavaScript Library

JΛ̊KE

John Chac..

Re: Re: to know if handler attached already

11 years ago

thanks for that link.... namespaced binds is what I wanted

$(window).unbind('resize.myns').bind('resize.myns', _resizeHandler);

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to know if handler attached already

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