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 am using following code on my page which I am loading in ajax.
$(document).ready(function() {
$('#button_id').click(function() {
//Do Something
});
});
Now When I click on the button action happens multiple times. I know that its happening because I am loading the ajax page multiple times.
Please help me solve this.
You can use .off() to remove existing listeners:
$(function() {
$('#button_id').off('click').click(function() {
//Do Something
});
});
If I am wrong about your implementation I apologize. Your problem may exist because the binding is created on first page load and then on subsequent ajax loads with new scripts being inserted and creating duplicate bindings. You should prevent any bindings from being generated on ajax loads to prevent duplicate bindings unless you are good with cleanup.
If the button you are clicking on exists in the ajax loaded area then you should use delegation to ensure that the click handlers still work.
For example:
$( "body" ).on( "click", "#button_id", function() {
//do something
});
This will add a binding to the body element, but more specifically to the id #button_id. A click event on the button will propagate and bubble up to the body element (or whatever parent element you choose).
This makes it so that dynamic elements can be inserted in the DOM and only one event handler is needed to listen for it.
No need for .on() or .off() calls for individual ajax loads. This allows your bindings to be much cleaner.
Of course, if your button is not likely to exist on the page all the time then it would not be a good idea to keep extra bindings. Only create these types of binding if they are always needed to prevent optimization issues.
A cleaner solution would be to remove that code from the ajax loaded HTML and use one single event handler in the master page
I guess your problem is the event is firing many times.
To fire only once try this:
$(document).ready(function() {
$('#button_id').on("click",function(e) {
e.preventDefault(); // This prevents the default non-js action (very used for anchors without links or hashes)
e.stopPropagation(); // Prevent the bubling of the event and spread more times
//Do Something
});
});
If doesn't work with e.stopPropagation(); try with e.stopInmediatePropagation();
Adding documentation for the last method I suggested. It could solve your problem.
http://api.jquery.com/event.stopimmediatepropagation/
I am basically having a little trouble with a <li> of items, that I am running a plugin through, which dynamically adds a data-tag ID to the data-* attribute.
This for some reason means that all items are dynamically added, and another function I am running on the same list elements won't run, because the event isn't dynamically attached.
What happens is:
1) Page renders
2) My 'other' function is available whilst DOM is loading
3) Page loads, the plugin code is available, but my 'other' function (which adds a hover box title which comes from below and animates up) no longer works. So it basically works until the other plugin kicks in.
My findings so far are:
I can use the jQuery 'on' to dynamically attach events to dynamically edited/created items (the #stage li items). Using this:
$('body').on('hover', '#stage li', function() {
// Do dynamic stuff
}
But this only works with 1 hover, and doesn't give me a mouseenter/mouseout solution which I really need. Does anyone have any ideas on how to accomplish this?
Yup:
$('#stage').on({
mouseenter: function(){
// do mouseentery shtuff
},
mouseleave: function(){
// mouse bye bye
}
},'li');
Changed .on() event binding from body to #stage and filter li from there, because it will be faster.
The cool thing about doing it this way (the XML way) is that you can easily add more stuff to it ... adding a mousemove function is just another comma and function below it in the same item, all contained within the one .on() binding. :)
Here's what you're looking for. Also, note that hover is no longer supported as of jQuery 1.9
$('mydiv').on('mouseenter', '#stage li', function( event ) {
// do something
}).on('mouseleave', '#stage li', function( event ) {
// do something different
});
Using jQuery how does one detect clicks not on specific elements, and perform an action consequently?
I have the following JavaScript
$('#master').click(function() {
$('#slave').toggle();
});
$(document).not('#master','#slave').click(function() {
$('#slave').hide();
});
and I cannot see where I am going wrong logically. You can see a live example here
Since you're binding to the click event on the document, you can use event.target to get the element that initiated the event:
$(document).click(function(event) {
if (!$(event.target).is("#master, #slave")) {
$("#slave").hide();
}
});
EDIT: As Mattias rightfully points out in his comment, the code above will fail to identify click events coming from descendants of #master and #slave (if there are any). In this situation, you can use closest() to check the event's target:
$(document).click(function(event) {
if (!$(event.target).closest("#master, #slave").length) {
$("#slave").hide();
}
});
Does this code do what you want? (not entirely sure if I understood correctly)
$('body').on('click', '*:not( #master, #slave )', function() {
$('#slave').hide();
});
http://jsfiddle.net/gZ4Hz/8/
Event delegation has long been supported natively by jQuery. The difficulty lies in creating the appropriate selector. Originally, delegate was used, but more recently the delegate form of on should be used.
The purpose of event delegation is to listen to events on child elements and invoke the bound event handlers on those elements as though they had been bound to the child element, instead of the parent. This means that instead of binding handlers to every element in the DOM, you're binding a handler to every element in the initial selection (document is a single element). This also makes for a simple way to use a single selector to bind to an ever changing set of elements, as new elements will propagate their events to document whether or not they existed when the initial event handler was bound:
$(document).on('click', '*:not(#master, #master *, #slave, #slave *)', function (e) {
//this will reference the clicked element
});
Additionally, note that I not only said the elements must not be #master or #slave, they must not be children of #master or #slave either.
Another thought, it may not be working because your browser may not be rendering body at 100% height; Try adjusting your base css to fix height of body and then a couple other thoughts.
e.stopPropagation(): Prevents the event from bubbling up the DOM tree, preventing any parent handlers from being notified of the event.
So if you change the first click code to the following:
$('#master').click(function(e) {
e.stopPropagation();
$('#slave').toggle();
});
Then you could change the call sign of the second too:
$("body, body *").not('#master, #slave').click(function(e) {
$('#slave').hide();
});
And that should cover it. Give it a try! or see this jsFiddle
Fredrik's answers works for elements already present in the document, but it didn't work for elements fetched by ajax calls.
I tried the following and it works for me. Sharing the code for future ajax coders.
$(document).on('click',function(event) {
if (!$(event.target).closest("#selector").length) {
if ($('#selector').is(":visible"))
$('#selector').slideUp();
}
});
Would have posted it as a comment but I don't have enough reputation for that.
$('.clickable-row').on("click",function(){
window.location = $(this).data('href');
return false;
});
$("td > a").on("click",function(e){
e.stopPropagation();
});
or
jQuery(document).ready(function($) {
$('.clickable-row').on("click",function(){
window.location = $(this).data('href');
return false;
});
$("td > a").on("click",function(e){
e.stopPropagation();
});
});
I wrote jQuery event handlers on DOM elements that are not yet in the page but might be loaded asynchronously into the page. What I observed was these event handlers seem to not recognize that some new elements were added to the DOM and that they need to act on them on triggering.
Am I right in my observation? How do I achieve this functionality?
If you want event handlers to work on dynamically added content, you need to use on
$(document).on("click", "someCssSelector", function(){
//your code here
});
Of course this will cause all clicks anywhere on your page to be watched. To be more efficient, see if you can structure your page so that all of these elements whose click event you want to handle will be in one container. ie, if all of these elements are going to be added to a div with an id of foo, you'd write the above more efficiently as
$("#foo").on("click", "someCssSelector", function(){
//your code here
});
If you're using jQuery < 1.7, you'd use delegate
$(document).delegate("someCssSelector", "click", function(){
//your code here
});
Am I right in my observation?
Yes.
How do I achieve this functionality?
Using the .on function to subscribe to those event handlers if you are using jQuery 1.7+:
$(document).on('click', '.someSelector', function() {
...
});
or using the .delegate function if you are using an older version (higher than 1.4.3):
$(document).delegate('.someSelector', 'click', function() {
...
});
For both you could use a more specific root than document to improve performance if you know that those elements will be added to some container for example.
And if you are using some prehistoric version you could go with .live():
$('.someSelector').live('click', function() {
...
});