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.
Not sure if I'm using the correct lingo,
But I want to click a div and when I do it should cause another to be clicked after.
Ex click div 1 then div 2 gets clicked (but not by user, just by JS)
Is this possible?
There is already a huge function attached to div 2 when clicked, so I need to to link the two if that makes sense. Easier hopefully than sorting through lots of code and trying to add it in.
Any help?
you can use:
$('#div1').click(function(){
$('#div2').trigger('click');
})
You can just call click() on div 2:
$('#div1').click(function(){
//your code
$('#div2').click();
});
$("#div1").click(function() {
// Do stuff...
// Then click the other DIV
$("#div2").click();
}
It is possible, in the click handler for div one call
$("#div2").click();
Yes this is possible creating the function for the click on the 1.
With
$('#iddiv1').click(function(){
//your code
$('#iddiv2').click();
});
Documentation
Yes you can by doing so:
$("#idDiv1").click(function(){
//do what you want
$("#idDiv2").trigger("click");
}
You need to have an onclick event TRIGGER a click on another div.
$('#foo').click(function() {
$('#bar').trigger("click");
});
$('#bar').click(function() {
// Do something
});
$('#div1').click(function() {
$('#div2').click();
});
Edit:
This solves your problem because it attaches a listener to div1 and executes a function whenever div1 is clicked. It just so happens that you want to emit another event for div1, which, in jQuery shorthand, is written with the .click() function.
Giving .click() a function as a parameter sets the callback for the click event, which can manually be called by calling the function without any parameters.
I've bound an event to an icon on click. The event changes the id of a button on the page. I want a new event to be bound to that new id, and the existing event bound to the old id to be unbound. How do I do this?
I can see from Firebug that the button id successfully changes when the icon is clicked. However, when I look at POST, I see that the hidden field with id "Final_Approval" has the value of "Approved", which tells me that the event tied to the original button id occurred, and I don't want it to. All of my jQuery is inside document ready.
The original button:
<button id="btn-final-approval-no-review" class="btn btn-warning" type="submit">Final Approval</button>
The original event tied to that id:
$('[id^="btn-final-approval"]').click(function () {
$("#Final_Approval").val("Approved");
});
The event triggered when the icon is clicked:
$("#add-vendor-item").click(function () {
$('#btn-final-approval-no-review').attr('id', 'btn-vendor-rep-review2');
}
The new event I want to take place:
$("#btn-vendor-rep-review2").click(function () {
$("#ItemRequestStatusId").val("#Portal.BusinessModel.Entities.ItemRequestStatusId.VendorRepReview");
});
To bind events to elements that change dynamically, you need to use delegation with on():
$(document).on('click', '[id^="btn-final-approval"]', function() {
$("#Final_Approval").val("Approved");
});
As adeneo said, you probably shouldn't move IDs around, you should use classes. But the same idea applies, you just have to change the selector in the on() call.
Use on delegate to bind click event dynamically.
$("body").on("click","#btn-vendor-rep-review2", function () {
$("#ItemRequestStatusId").val("#Portal.BusinessModel.Entities.ItemRequestStatusId.VendorRepReview");
});
$(document).on('click', '#finalApproval', function() {
if($(this).hasClass('first')){
$(this).removeClass('first');
//first action to be preformed
}else{
//second action to be preformed.
}
});
then simply add class first to the button on page load.
If you need it to toggle back you can just re-add the class first in the second action to be preformed area
EDIT
after re-reading the question you probably cant use this - just substitute with the id / class of the item in question and add the if/else statement to the handler for that item.
I try to disable the binded click event in jquery, but I can found only to unbind or off the event click. If I do unbind() I can't get back those binded functions back.
For eg: I have a three div binded various function with click event. In some case I dont want particular div click event. So I try to disable that event only can't try to unbind() or off() the event. If I unbind() the event from div then again I need to bind those functions back to that div. See fiddle
Is there a way to disable the event and enable back those events without unbinding it.
Thanks in advance.
You can stop event like this:
function handler(e){
if(yourcondition)
e.preventDefault();
else {
}
}
You can give a class name to those div's. And call the click event though this class name like
$(".class_name").click(function(){ });
and when you want to disable the click event then use the id selector to remove the class
$("#div_id").removeClass("class_name");
and when you want to add the click event then then use the id selector to add the class
$("#div_id").addClass("class_name");
in this example
http://jsfiddle.net/prollygeek/WuNGJ/2/
you can remove class pointer from all elements so that no element will respond to any bound action , once you trun back the class , it will respond normally , class binding and unbining can be done by clicking div 1.
$(".element").on('click',function(){
if($(this).hasClass("triggered"))
{
$(".element").addClass('pointer');
$(this).removeClass("triggered");
}
else if($(this).hasClass("pointer"))
{
$(".pointer").removeClass("pointer");
$(this).addClass("triggered");
}
//do whatever
})
I have a button that clears a list, the click on this button shows a dialog that asks for validation (Yes/No). What I want is to disable the "Clear" button after clearing the list (Click on Yes). Here's my code :
$('#clearBtn').click(function() {
$('#alert5').show();
$('#bg').show();
$('#Yes').click(function(){
$('.list1').empty();
$('#clearBtn').disable(true);
$('#clearBtn').click(function(e){
e.preventDefault();
});
$(".alert").fadeOut(250);
$(".alertbg").fadeOut(250);
});
});
the preventDefault() function doesn't seem to work.
First never nest event handlers.
$('#cleatBtn').click(function () {
$('#alert5').show();
$('#bg').show();
});
$('#Yes').click(function () {
$('.list1').empty();
$('#cleatBtn').attr('disabled', true);
$(".alert").fadeOut(250);
$(".alertbg").fadeOut(250);
});
If you just want to disable then use the following syntax
$('#cleatBtn').attr('disabled', true);
Remove the innermost event completely.. That is not required.
Use on to bind the events, if you want the button to be enabled but turn off the event handler using off
One more option you have is to apply a class to the button when you press yes and execute the code only when the class is not present.
$('#cleatBtn').click(function () {
if( !$(this).hasClass('active')) {
$('#alert5').show();
$('#bg').show();
}
});
$('#Yes').click(function () {
$('.list1').empty();
$('#cleatBtn').attr('disabled', true);
$('#cleatBtn').addClass('active');
$(".alert").fadeOut(250);
$(".alertbg").fadeOut(250);
});
To disable a button, call the prop function with the argument true on it:
$('#cleatBtn').prop("disabled", true);
e.preventDefault(); is the correct way of cancelling events. Some older browsers also expect a return type of false. Which I think will cause jQuery to call preventDefault()?
Here's a good answer: What's the effect of adding 'return false' to a click event listener?
I think your structure looks a bit odd. you don't need to attach click events within a click event.
Just attach them all separately on document.ready events. At the moment they are nested, then go back to trying to cancel your event. The dom tree might be confused by the way the events are nested.
Hope that helps.