How to make jQuery `bind` or `on` event handlers idempotent
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30-06-2021 - |
Question
Is there a way that I can call $(selector).bind('click', handler)
or $(selector).on('click', handler)
multiple times such that the handler only gets attached once?
Right now, I have multiple AJAX handlers with different success callbacks, each of which re-renders a different set of elements on the page. Ideally I'd like to refactor the "reattach events" routine to a single function rather than a routine for all.
The only way I can think of to do this right now is to explicitly unbind, for example:
$(selector).off('click');
$(selector).on('click', handler);
Looking for a way to do something like that automatically.
Solution
A better approach is just to move the .on
call to a container. If you have a container, the .on
sticks around and is applied to any existing or new children matching your selector:
$(container-selector).on("click", "element-selector", function(event){
// do stuff
});
Cheers.
OTHER TIPS
You can namespace your event handlers, and then just make sure you unbind before binding:
$('#something').unbind("click.some-feature").bind("click.some-feature", function() { ... });
You could write your own jQuery function to do that automatically:
$.fn.schneiderBind = function(name, fn) {
return this.unbind(name).bind(name, fn);
});
$('#something').schneiderBind("click", function() { ... });
Alternatively, you can use bubbling and delegation to bind higher in the DOM, at a point immune to dynamic updates.
$(document).on("click","selector", function() { code goes here... });
This will work with dynamically added objects