Can I remove inline event handlers using jQuery? - javascript

I have some HTML with an onclick attribute. I want to override that attribute using jQuery. Is there any way to remove the click handler using jQuery? Using unbind doesn't work.

Try the .removeAttr() function:
$(function() {
$('a').removeAttr('onclick');
});
​
jsfiddle demo.
Once you've got rid of the onclick attribute you could attach your own click handler.

$("#theElement")[0].onclick = function() {
whatever();
};
// -- or --
$("#theElement")[0].onclick = null;
It's not that jQuery would make the standard DOM functions and properties go away. ;-)

As quoted in http://api.jquery.com/prop/ Removing an inline onclick event handler using .removeAttr() doesn't achieve the desired effect in Internet Explorer 8, 9 and 11. To avoid potential problems, use .prop() instead.
So this can be done as
$(function() {
$('a').prop('onclick', false);
});

There is a plugin for it, but you should only do this when you really need to. The plugin gives you the option to call the old function or to ignore it entirely.
jQuery Override Plugin
$(divElementObj).override('onclick', 'click', function(...));

Tried given options but worked partially as they removed one but not all.
Instead I tried following chaining as workaround. I am using ver 1.4.2.
jQuery("selector")
.removeAttr("onclick").removeAttr("onmouseout").removeAttr("onmouseover");

Related

jQuery remove scroll listener after reach certain point [duplicate]

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.

jQuery live("click", function() {...}) doesn't work for body

I am trying this simple code here. It doesn't work for either the actual click event or the one which is commented out. Can anybody explain why? I have had issues with not previously also...
That's simply because the live function, which was long deprecated, has now been removed from jQuery.
Replace
$("body").live("click",function() { alert("coo"); });
with
$("body").on("click",function() { alert("coo"); });
Look at the top right of this page : "removed 1.9".
.live has been deprecated in jQuery since v1.7, and has been removed in v1.9.
You should replace it with .on().
.on has 2 syntaxes for binding elements, whereas .live only had 1.
If the element exists at the time you are binding, you do it like this:
$('.element').on('click', function(){
});
You can even use the shorthand:
$('.element').click(function(){
});
If the element does not exist at the time, or new ones will be added (which is what .live was normally used for), you need to use "event delegation":
$(document).on('click', '.element', function(){
});
NOTE: You want to bind to the closest static element, not always document.
The live() method has been deprecated and deleted. Use on().
If you are using jquery 2.0 version then you have to get the migrate 1.0 too
see this: http://jsfiddle.net/CRYDV/1/
otherwise you have to work with .on() handler as suggested in above answers.

Focusin using live not working -jQuery

I am trying to attach a focusin event on a future element using jquery 1.5.2. Just to clarify,this has also been attempted using jQuery 1.7.2 with the same issue.
The event is not firing as i expected it to. Yet a similar click event works correctly using .live
I've put together an example here for you to take a look at my code. Hopefully this will not been a simple issue (although it always seems to be!).
Link to jsfiddle
This is my focusin event i am trying to attach
$(".active").live("focusin", function() {
$(this).text("focusin using live");
});
I believe i have found some related questions, but im unable to fix my code using them. I would prefer an explanation over a "here is your code corrected answer".
If you think i need to add more information to my question please leave a comment.
Related
jQuery focusin and focusout live events are not firing
Why the "focusin" event handler isn't called?
You need to focus the element if you expect the focusin event to trigger. The fact that you are applying a DOM element the .active class doesn't mean that you are focusing it.
$('.active').live('focusin', function() {
$(this).text('focusin using live');
});
$('.active').focus();
​
Here's a demo.
Another thing you will notice is that .live() supports the focusin event starting from jQuery 1.7.1. Obviously in this version of jQuery, .live() is deprecated and you should use .on():
$(document).on('focusin', '.active', function() {
$(this).text('focusin using on');
});
$('.active').focus();
​

jQuery.click not working after adding element to the DOM

I have a simple jQuery('div#star').click(function.
The function works once when the DOM is initially loaded, but at a later time, I add a div#star to the DOM, and at that point the click function is not working.
I am using jQuery 1.4.4, and as far as I know, I shouldn't need to use .live or .bind anymore. There is never more than one div#star in the DOM at any one time. I tried changing from id="star" to class="star" but that didn't help.
Any suggestions on how to get this working or why it isn't working?
I've had the .click inside the jQuery(document).ready, and in an external js file, and neither works after adding the div to the DOM.
This works with jQuery 2.0.3
$(document).on('click', '#myDiv', function() {
myFunc();
});
As of jQuery 1.7, the .live() method is deprecated. The current recommendation is to use .on() which provides all functionality covering the previous methods of attaching event handlers. Simply put, you don't have to decide any more since on() does it all.
Documentation is handily provided in the help for converting from the older jQuery event methods .bind(), .delegate(), and .live()
You still need to use live events.
http://api.jquery.com/live/
try
.on('event', 'element', function(){
//code })
You need to use either live or delegate here. Nothing has changed in this department since jQuery 1.4.4.
Try to think of it like this: click and bind attach an event to the element itself, so when the element disappears, all the information about the event does too. live attaches the event at the document level and it includes information about which element and event type to listen for. delegate does the same thing, except it attaches the event information to whatever parent element you like.
user "live" method $("div#star").live("click", function() {});
Doc
You can use delegate instead on :
$(document).delegate('click', "selector", function() {
//your code
});
I hope it will help.

Remove Attributes onmouseover and onmouseout

I am trying to make use of JQuery's remove attribute like this:
$('#rom-img_1').removeAttr('mouseover');
$('#rom-img_2').removeAttr('mouseout');
However, it does not remove the effects of the events as the events are still triggered on mouseover and on mouseout. I have tried adding "on" before the events names too but JQuery doesn't use it like that.
Why isn't this working and how can I remove those attributes.
This is a bit of the HTML:
<div onmouseout="$('#heart_401').css({'display':'none'});" onmouseover="$('#heart_401').css({'display':'block'});" id="row-img_11"></div>
Thanks all for any help
Never register event handlers by using onsomething in the html code. It makes your markup less readable and causes various problems (such as this not pointing to the element).
Always register them by using $(...).mouseover(function() { /* yourcode */ }) or $(...).bind('mouseover', function() { /* yourcode */ }).
Then you can easily remove the handlery by using $(...).unbind('mouseover').
Of course you can also use other handlers like click or focus instead of mouseover.
The reason why removeAttr doesn't work is that handlers aren't attributes. Internally they are turned into handlers and thus you cannot remove them by removing the attribute.
However, this might work:
$('#rom-img_1')[0].mouseover = function() {};
$('#rom-img_1')[0].mouseout = function() {};
$('#rom-img_1')
You've mis-spelled row-img_11. jQuery doesn't error this, you just get a selector result with no matches.
removeAttr of onmouseover works for me with this fixed, although you would generally want to avoid using inline event handler attributes like this.
To get and set mouseover and mouseout events in jQuery use .mouseover() and .mouseout(). Syntax as follows:
Set (remove in this case):
$("#row-img_11").mouseover("");
$("#row-img_11").mouseout("");
http://api.jquery.com/mouseover/
http://api.jquery.com/mouseout/
To apply the methods to a group of divs:
$("div:contains('row-img')").each(function() {
$(this).mouseover("");
$(this).mouseout("");
});
If you just spell the id right, it works just fine:
$('#row-img_11').removeAttr('onmouseover').removeAttr('onmouseout');

Categories