admin管理员组

文章数量:1329888

In this module I'm working on I have a listener to a 'resize' event in the window. Every time the module is ran, I need to check if there's already a listener registered to that event and detach it, in order to avoid unwanted behavior, memory leaks and etc.

So far so good, but, in this application we are working on, chances are that some handlers are already attached to the 'resize' event and I can't call $(window).off('resize'), as this would flush all the other event handlers previously registered by other plugins or modules.

Being that said, I would like to know if there's a way to identify my handler and only detach things that I have registered myself. How do I set an identifier to my event handler in order to be referenced in the .off() function?

Any help would be nice.

In this module I'm working on I have a listener to a 'resize' event in the window. Every time the module is ran, I need to check if there's already a listener registered to that event and detach it, in order to avoid unwanted behavior, memory leaks and etc.

So far so good, but, in this application we are working on, chances are that some handlers are already attached to the 'resize' event and I can't call $(window).off('resize'), as this would flush all the other event handlers previously registered by other plugins or modules.

Being that said, I would like to know if there's a way to identify my handler and only detach things that I have registered myself. How do I set an identifier to my event handler in order to be referenced in the .off() function?

Any help would be nice.

• javascript
• jquery
• jquery-events

Share Follow edited Sep 23, 2022 at 17:58 Brian Tompsett - 汤莱恩 5,8937272 gold badges6161 silver badges133133 bronze badges asked May 9, 2014 at 17:34 darksoulsongdarksoulsong 15.3k1414 gold badges5151 silver badges9696 bronze badges 3

• 1 use off to remove all handlers and just write new event after it.. – Ehsan Sajjad Commented May 9, 2014 at 17:36
• 2 use namespaced event to bind/unbind it or use a referenced handler – A. Wolff Commented May 9, 2014 at 17:37
• @EhsanSajjad I can't do that because I would remove the other handlers this way. I need to remove only the event handlers that I have attached myself; – darksoulsong Commented May 9, 2014 at 17:38

Add a ment  | 

3 Answers 3

Sorted by: Reset to default 11

Here 2 different suggestions. You can either give a namespace to your event or pass a none anonymous function when binding.

Example when using namespace :

$(window).on('resize.event1', function(){});
$(window).on('resize.event2', function(){});

//Only turn off event 2
$(window).off('resize.event2');

jQuery allow you to identify your event. This behaviour is called namespace. The current event and the event name must be separate by a dot. In that case, i am binding 2 resize event (left side of the dot), one with the name event1 and the other with event2.

By identifying the event, you can remove (or trigger) single event when an object have multiple of the same event.

$(window).trigger('resize'); //Trigger both;
$(window).trigger('resize.event2'); //Trigger event2;

Example using named functions :

$(window).on('resize', function1);
$(window).on('resize', function2);

//Only turn off event 2
$(window).off('resize', function2);

Associating a none anonymous function allow you to remove the event if the passed function match the current event function. Because function2 === function2, only the second function will be remove since function1 !== function2!

If you use named handlers (as opposed to anonymous functions) you can pass the name of the handler to off to remove just that one (http://api.jquery./off/)

function flash() {
  $( "div" ).show().fadeOut( "slow" );
}

$( "body" ).off( "click", "#theone", flash )

Do something like this-

$(window).off('resize.myCustomEvent'); 

and vice versa to attach it

本文标签： javascriptMultiple Handlers attached to one event How to detach only oneStack Overflow