I have an input type="image". This acts like the cell notes in Microsoft Excel. If someone enters a number into the text box that this input-image is paired with, I setup an event handler for the input-image. Then when the user clicks the image, they get a little popup to add some notes to the data.
My problem is that when a user enters a zero into the text box, I need to disable the input-image's event handler. I have tried the following, but to no avail.
$('#myimage').click(function { return false; });
jQuery ≥ 1.7
With jQuery 1.7 onward the event API has been updated, .bind()/.unbind() are still available for backwards compatibility, but the preferred method is using the on()/off() functions. The below would now be,
$('#myimage').click(function() { return false; }); // Adds another click event
$('#myimage').off('click');
$('#myimage').on('click.mynamespace', function() { /* Do stuff */ });
$('#myimage').off('click.mynamespace');
jQuery < 1.7
In your example code you are simply adding another click event to the image, not overriding the previous one:
$('#myimage').click(function() { return false; }); // Adds another click event
Both click events will then get fired.
As people have said you can use unbind to remove all click events:
$('#myimage').unbind('click');
If you want to add a single event and then remove it (without removing any others that might have been added) then you can use event namespacing:
$('#myimage').bind('click.mynamespace', function() { /* Do stuff */ });
and to remove just your event:
$('#myimage').unbind('click.mynamespace');
This wasn't available when this question was answered, but you can also use the live() method to enable/disable events.
$('#myimage:not(.disabled)').live('click', myclickevent);
$('#mydisablebutton').click( function () { $('#myimage').addClass('disabled'); });
What will happen with this code is that when you click #mydisablebutton, it will add the class disabled to the #myimage element. This will make it so that the selector no longer matches the element and the event will not be fired until the 'disabled' class is removed making the .live() selector valid again.
This has other benefits by adding styling based on that class as well.
This can be done by using the unbind function.
$('#myimage').unbind('click');
You can add multiple event handlers to the same object and event in jquery. This means adding a new one doesn't replace the old ones.
There are several strategies for changing event handlers, such as event namespaces. There are some pages about this in the online docs.
Look at this question (that's how I learned of unbind). There is some useful description of these strategies in the answers.
How to read bound hover callback functions in jquery
If you want to respond to an event just one time, the following syntax should be really helpful:
$('.myLink').bind('click', function() {
//do some things
$(this).unbind('click', arguments.callee); //unbind *just this handler*
});
Using arguments.callee, we can ensure that the one specific anonymous-function handler is removed, and thus, have a single time handler for a given event. Hope this helps others.
maybe the unbind method will work for you
$("#myimage").unbind("click");
I had to set the event to null using the prop and the attr. I couldn't do it with one or the other. I also could not get .unbind to work. I am working on a TD element.
.prop("onclick", null).attr("onclick", null)
If event is attached this way, and the target is to be unattached:
$('#container').on('click','span',function(eo){
alert(1);
$(this).off(); //seams easy, but does not work
$('#container').off('click','span'); //clears click event for every span
$(this).on("click",function(){return false;}); //this works.
});
You may be adding the onclick handler as inline markup:
<input id="addreport" type="button" value="Add New Report" onclick="openAdd()" />
If so, the jquery .off() or .unbind() won't work. You need to add the original event handler in jquery as well:
$("#addreport").on("click", "", function (e) {
openAdd();
});
Then the jquery has a reference to the event handler and can remove it:
$("#addreport").off("click")
VoidKing mentions this a little more obliquely in a comment above.
If you use $(document).on() to add a listener to a dynamically created element then you may have to use the following to remove it:
// add the listener
$(document).on('click','.element',function(){
// stuff
});
// remove the listener
$(document).off("click", ".element");
To remove ALL event-handlers, this is what worked for me:
To remove all event handlers mean to have the plain HTML structure without all the event handlers attached to the element and its child nodes. To do this, jQuery's clone() helped.
var original, clone;
// element with id my-div and its child nodes have some event-handlers
original = $('#my-div');
clone = original.clone();
//
original.replaceWith(clone);
With this, we'll have the clone in place of the original with no event-handlers on it.
Good Luck...
Updated for 2014
Using the latest version of jQuery, you're now able to unbind all events on a namespace by simply doing $( "#foo" ).off( ".myNamespace" );
Best way to remove inline onclick event is $(element).prop('onclick', null);
Thanks for the information. very helpful i used it for locking page interaction while in edit mode by another user. I used it in conjunction with ajaxComplete. Not necesarily the same behavior but somewhat similar.
function userPageLock(){
$("body").bind("ajaxComplete.lockpage", function(){
$("body").unbind("ajaxComplete.lockpage");
executePageLock();
});
};
function executePageLock(){
//do something
}
In case .on() method was previously used with particular selector, like in the following example:
$('body').on('click', '.dynamicTarget', function () {
// Code goes here
});
Both unbind() and .off() methods are not going to work.
However, .undelegate() method could be used to completely remove handler from the event for all elements which match the current selector:
$("body").undelegate(".dynamicTarget", "click")
I know this comes in late, but why not use plain JS to remove the event?
var myElement = document.getElementById("your_ID");
myElement.onclick = null;
or, if you use a named function as an event handler:
function eh(event){...}
var myElement = document.getElementById("your_ID");
myElement.addEventListener("click",eh); // add event handler
myElement.removeEventListener("click",eh); //remove it
This also works fine .Simple and easy.see http://jsfiddle.net/uZc8w/570/
$('#myimage').removeAttr("click");
if you set the onclick via html you need to removeAttr ($(this).removeAttr('onclick'))
if you set it via jquery (as the after the first click in my examples above) then you need to unbind($(this).unbind('click'))
All the approaches described did not work for me because I was adding the click event with on() to the document where the element was created at run-time:
$(document).on("click", ".button", function() {
doSomething();
});
My workaround:
As I could not unbind the ".button" class I just assigned another class to the button that had the same CSS styles. By doing so the live/on-event-handler ignored the click finally:
// prevent another click on the button by assigning another class
$(".button").attr("class","buttonOff");
Hope that helps.
Hope my below code explains all.
HTML:
(function($){
$("#btn_add").on("click",function(){
$("#btn_click").on("click",added_handler);
alert("Added new handler to button 1");
});
$("#btn_remove").on("click",function(){
$("#btn_click").off("click",added_handler);
alert("Removed new handler to button 1");
});
function fixed_handler(){
alert("Fixed handler");
}
function added_handler(){
alert("new handler");
}
$("#btn_click").on("click",fixed_handler);
$("#btn_fixed").on("click",fixed_handler);
})(jQuery);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id="btn_click">Button 1</button>
<button id="btn_add">Add Handler</button>
<button id="btn_remove">Remove Handler</button>
<button id="btn_fixed">Fixed Handler</button>
I had an interesting case relevant to this come up at work today where there was a scroll event handler for $(window).
// TO ELIMINATE THE RE-SELECTION AND
// RE-CREATION OF THE SAME OBJECT REDUNDANTLY IN THE FOLLOWING SNIPPETS
let $window = $(window);
$window.on('scroll', function() { .... });
But, to revoke that event handler, we can't just use
$window.off('scroll');
because there are likely other scroll event handlers on this very common target, and I'm not interested in hosing that other functionality (known or unknown) by turning off all of the scroll handlers.
My solution was to first abstract the handler functionality into a named function, and use that in the event listener setup.
function handleScrollingForXYZ() { ...... }
$window.on('scroll', handleScrollingForXYZ);
And then, conditionally, when we need to revoke that, I did this:
$window.off('scroll', $window, handleScrollingForXYZ);
The janky part is the 2nd parameter, which is redundantly selecting the original selector. But, the jquery documentation for .off() only provides one method signature for specifying the handler to remove, which requires this middle parameter to be
A selector which should match the one originally passed to .on() when attaching event handlers.
I haven't ventured to test it out with a null or '' as the 2nd parameter, but perhaps the redundant $window isn't necessary.
I've a bad-programmed library which is doing this
$(document).on('click','#keep_first_only_button', function(){
I wrote, after this, a piece of code to 'override' this bad behaviour
$("keep_first_only_button").unbind("click");
$("keep_first_only_button").on("click", selectKeepFirstOfAll);
BUT this is not working, then document.click function handler is triggered again
I cannot unbind all click events from document, because disasters will happen in the page.
Which is the right way to proceed in this situation?
EDIT: Sorry for time loosing question, I didn't see the missing '#' in my selector. I'm really sorry !
The original event handler was bound as a delegated event, so you can't remove it from $('#keep_first_only_button') itself. You need to remove it on the document level.
From the documentation:
To remove specific delegated event handlers, provide a selector
argument. The selector string must exactly match the one passed to
.on() when the event handler was attached. To remove all delegated
events from an element without removing non-delegated events, use the
special value "**".
In other words, to unbind a delegated event, you should just use the same set of arguments you used to bind them but pass them to off instead. Since the bound function is anonymous you can't reference it, so you'll have to settle with unbinding all delegated event handlers bound to #keep_first_only_button on the document level:
$(document).off('click', '#keep_first_only_button');
EDIT: Looks like the problem was just the missing hash. Odd, I thought you couldn't unbind delegated event handlers using a regular .off() call...
$("#keep_first_only_button")...
Missing the hash?
For anyone wondering ...Mattias Buelens is correct.
If you have the element bound like
$(document).on("click","#element",function(){ });
And want to shut it off later, you have to do it as:
$("#element").click(function(e) {
$(document).off('click', '#element');
});
If you want remove event with out consider selector use
$(document).off("click","**");
Suppose i have a component, inputType="text" with id ="cmp";
In a js file ,
$("input[type='text']").bind('keypress', function(e) {
//Case 1
});
In my jsp file,
$("#cmp").keypress(function() {
//Case 2
});
Now I need to remove only one keypress event.
Is it possible to remove the keypress event for id ="cmp" that is registered from js file.
But we should not not remove event that is registered from jsp file.
Note:
According to my requirement, I cannot change .js file.
you can use off of jquery method to remove events Jquery OFf
The off() method removes event handlers that were attached with .on().
See the discussion of delegated and directly bound events on that page
for more information. Specific event handlers can be removed on
elements by providing combinations of event names, namespaces,
selectors, or handler function names. When multiple filtering
arguments are given, all of the arguments provided must match for the
event handler to be removed.
$('#cmp').off('keypress');
use off()
off: Remove an event handler.
$('#cmp').off('keypress');
You will want to use either .unbind() or .off() (jQuery 1.7+) depending on how the event was originally attached and what version of jQuery you are using.
// Prior to jQuery 1.7
$("#cmp").unbind("keypress");
// jQuery 1.7+
$("#cmp").off("keypress");
If you can modify the original location where you are binding the event handler, you might also be able to use event namespaces to remove only a specifically named event.
// Original binding
$("#cmp").on("keypress.someName", function() {
...
});
// Unbinding
$("#cmp").off("keypress.someName");
EXAMPLE
I have an ajax app that will run functions on every interaction. I'd like to be able to run my setup function each time so all my setup code for that function remains encapsulated. However, binding elements more than once means that the handler will run more than once, which is obviously undesirable. Is there an elegant way in jQuery to call bind on an element more than once without the handler being called more than once?
User jQuery one function like Tom said, but unbind the handler each time before binding again. It helps to have the event handler assigned to a variable than using an anonymous function.
var handler = function(e) { // stuff };
$('#element').unbind('click', handler).one('click', handler);
//elsewhere
$('#element').unbind('click', handler).one('click', handler);
You can also do .unbind('click') to remove all click handlers attached to an element.
You could attach the event to document with the one() function:
$(document).one('click', function(e) {
// initialization here
});
Once run, this event handler is removed again so that it will not run again. However, if you need the initialization to run before the click event of some other element, we will have to think of something else. Using mousedown instead of click might work then, as the mousedown event is fired before the click event.
You can also use .off() if unbind doesn't do the trick. Make sure the selector and event given to .off exactly match the ones initially provided to .on():
$("div.selector").off("click", "a.another_selector");
$("div.selector").on("click", "a.another_selector", function(e){
This is what worked for me in resolving the same ajax reloading problem.
The answer from Chetan Sastry is what you want. Basically just call a $(element).unbind(event); before every event.
So if you have a function like loadAllButtonClicks() that contains all the
$(element).on("click", function (){});
methods for each button on your page, and you run that every time a button is clicked, this will obviously produce more than one event for each button. To solve this just add
$(element).unbind(event);
before every
$(element).on("click", function (){});
and it will unbind all events to that element, then add the one click event.
I want to attach a click event to a button element and then later remove it, but I can't get unclick() or unbind() event(s) to work as expected. In the code below, the button is tan colour and the click event works.
window.onload = init;
function init() {
$("#startButton").css('background-color', 'beige').click(process_click);
$("#startButton").css('background-color', 'tan').unclick();
}
How can I remove events from my elements?
There's no such thing as unclick(). Where did you get that from?
You can remove individual event handlers from an element by calling unbind:
$("#startButton").unbind("click", process_click);
If you want to remove all handlers, or you used an anonymous function as a handler, you can omit the second argument to unbind():
$("#startButton").unbind("click");
Or you could have a situation where you want to unbind the click function just after you use it, like I had to:
$('#selector').click(function(event){
alert(1);
$(this).unbind(event);
});
unbind is your friend.
$("#startButton").unbind('click')
Are you sure you want to unbind it? What if later on you want to bind it again, and again, and again? I don't like dynamic event-handling bind/unbind, since they tend to get out of hand, when called from different points of your code.
You may want to consider alternate options:
change the button "disabled" property
implement your logic inside "process_click" function
Just my 2 cents, not an universal solution.