This question already has answers here:
Event binding on dynamically created elements?
(23 answers)
Closed 8 years ago.
Suppose I have some jQuery code that attaches an event handler to all elements with class .myclass.
For example:
$(function(){
$(".myclass").click( function() {
// do something
});
});
And my HTML might be as follows:
<a class="myclass" href="#">test1</a>
<a class="myclass" href="#">test2</a>
<a class="myclass" href="#">test3</a>
That works with no problem.
However, consider if the .myclass elements were written to the page at some future time.
For example:
<a id="anchor1" href="#">create link dynamically</a>
<script type="text/javascript">
$(function(){
$("#anchor1").click( function() {
$("#anchor1").append('<a class="myclass" href="#">test4</a>');
});
});
</script>
In this case, the test4 link is created when a user clicks on a#anchor1.
The test4 link does not have the click() handler associated with it, even though it has class="myclass".
Basically, I would like to write the click() handler once and have it apply to both content present at page load, and content brought in later via AJAX / DHTML. Any idea how I can fix this?
I am adding a new answer to reflect changes in later jQuery releases. The .live() method is deprecated as of jQuery 1.7.
From http://api.jquery.com/live/
As of jQuery 1.7, the .live() method is deprecated. Use .on() to attach event handlers. Users of older versions of jQuery should use .delegate() in preference to .live().
For jQuery 1.7+ you can attach an event handler to a parent element using .on(), and pass the a selector combined with 'myclass' as an argument.
See http://api.jquery.com/on/
So instead of...
$(".myclass").click( function() {
// do something
});
You can write...
$('body').on('click', 'a.myclass', function() {
// do something
});
This will work for all a tags with 'myclass' in the body, whether already present or dynamically added later.
The body tag is used here as the example had no closer static surrounding tag, but any parent tag that exists when the .on method call occurs will work. For instance a ul tag for a list which will have dynamic elements added would look like this:
$('ul').on('click', 'li', function() {
alert( $(this).text() );
});
As long as the ul tag exists this will work (no li elements need exist yet).
Sometimes doing this (the top-voted answer) is not always enough:
$('body').on('click', 'a.myclass', function() {
// do something
});
This can be an issue because of the order event handlers are fired. If you find yourself doing this, but it is causing issues because of the order in which it is handled.. You can always wrap that into a function, that when called "refreshes" the listener.
For example:
function RefreshSomeEventListener() {
// Remove handler from existing elements
$("#wrapper .specific-selector").off();
// Re-add event handler for all matching elements
$("#wrapper .specific-selector").on("click", function() {
// Handle event.
}
}
Because it is a function, whenever I set up my listener this way, I typically call it on document ready:
$(document).ready(function() {
// Other ready commands / code
// Call our function to setup initial listening
RefreshSomeEventListener();
});
Then, whenever you add some dynamically added element, call that method again:
function SomeMethodThatAddsElement() {
// Some code / AJAX / whatever.. Adding element dynamically
// Refresh our listener, so the new element is taken into account
RefreshSomeEventListener();
}
Hopefully this helps!
Regards,
After jQuery 1.7 the preferred methods are .on() and .off()
Sean's answer shows an example.
Now Deprecated:
Use the jQuery functions .live() and .die(). Available in
jQuery 1.3.x
From the docs:
To display each paragraph's text in an
alert box whenever it is clicked:
$("p").live("click", function(){
alert( $(this).text() );
});
Also, the livequery plugin does this and has support for more events.
If you're adding a pile of anchors to the DOM, look into event delegation instead.
Here's a simple example:
$('#somecontainer').click(function(e) {
var $target = $(e.target);
if ($target.hasClass("myclass")) {
// do something
}
});
You can bind a single click event to a page for all elements, no matter if they are already on that page or if they will arrive at some future time, like that:
$(document).bind('click', function (e) {
var target = $(e.target);
if (target.is('.myclass')) {
e.preventDefault(); // if you want to cancel the event flow
// do something
} else if (target.is('.myotherclass')) {
e.preventDefault();
// do something else
}
});
Been using it for a while. Works like a charm.
In jQuery 1.7 and later, it is recommended to use .on() in place of bind or any other event delegation method, but .bind() still works.
Binds a handler to an event (like click) for all current - and future - matched element. Can also bind custom events.
link text
$(function(){
$(".myclass").live("click", function() {
// do something
});
});
If your on jQuery 1.3+ then use .live()
Binds a handler to an event (like
click) for all current - and future -
matched element. Can also bind custom
events.
You want to use the live() function. See the docs.
For example:
$("#anchor1").live("click", function() {
$("#anchor1").append('<a class="myclass" href="#">test4</a>');
});
Related
This question already has answers here:
Event binding on dynamically created elements?
(23 answers)
Closed 8 years ago.
Suppose I have some jQuery code that attaches an event handler to all elements with class .myclass.
For example:
$(function(){
$(".myclass").click( function() {
// do something
});
});
And my HTML might be as follows:
<a class="myclass" href="#">test1</a>
<a class="myclass" href="#">test2</a>
<a class="myclass" href="#">test3</a>
That works with no problem.
However, consider if the .myclass elements were written to the page at some future time.
For example:
<a id="anchor1" href="#">create link dynamically</a>
<script type="text/javascript">
$(function(){
$("#anchor1").click( function() {
$("#anchor1").append('<a class="myclass" href="#">test4</a>');
});
});
</script>
In this case, the test4 link is created when a user clicks on a#anchor1.
The test4 link does not have the click() handler associated with it, even though it has class="myclass".
Basically, I would like to write the click() handler once and have it apply to both content present at page load, and content brought in later via AJAX / DHTML. Any idea how I can fix this?
I am adding a new answer to reflect changes in later jQuery releases. The .live() method is deprecated as of jQuery 1.7.
From http://api.jquery.com/live/
As of jQuery 1.7, the .live() method is deprecated. Use .on() to attach event handlers. Users of older versions of jQuery should use .delegate() in preference to .live().
For jQuery 1.7+ you can attach an event handler to a parent element using .on(), and pass the a selector combined with 'myclass' as an argument.
See http://api.jquery.com/on/
So instead of...
$(".myclass").click( function() {
// do something
});
You can write...
$('body').on('click', 'a.myclass', function() {
// do something
});
This will work for all a tags with 'myclass' in the body, whether already present or dynamically added later.
The body tag is used here as the example had no closer static surrounding tag, but any parent tag that exists when the .on method call occurs will work. For instance a ul tag for a list which will have dynamic elements added would look like this:
$('ul').on('click', 'li', function() {
alert( $(this).text() );
});
As long as the ul tag exists this will work (no li elements need exist yet).
Sometimes doing this (the top-voted answer) is not always enough:
$('body').on('click', 'a.myclass', function() {
// do something
});
This can be an issue because of the order event handlers are fired. If you find yourself doing this, but it is causing issues because of the order in which it is handled.. You can always wrap that into a function, that when called "refreshes" the listener.
For example:
function RefreshSomeEventListener() {
// Remove handler from existing elements
$("#wrapper .specific-selector").off();
// Re-add event handler for all matching elements
$("#wrapper .specific-selector").on("click", function() {
// Handle event.
}
}
Because it is a function, whenever I set up my listener this way, I typically call it on document ready:
$(document).ready(function() {
// Other ready commands / code
// Call our function to setup initial listening
RefreshSomeEventListener();
});
Then, whenever you add some dynamically added element, call that method again:
function SomeMethodThatAddsElement() {
// Some code / AJAX / whatever.. Adding element dynamically
// Refresh our listener, so the new element is taken into account
RefreshSomeEventListener();
}
Hopefully this helps!
Regards,
After jQuery 1.7 the preferred methods are .on() and .off()
Sean's answer shows an example.
Now Deprecated:
Use the jQuery functions .live() and .die(). Available in
jQuery 1.3.x
From the docs:
To display each paragraph's text in an
alert box whenever it is clicked:
$("p").live("click", function(){
alert( $(this).text() );
});
Also, the livequery plugin does this and has support for more events.
If you're adding a pile of anchors to the DOM, look into event delegation instead.
Here's a simple example:
$('#somecontainer').click(function(e) {
var $target = $(e.target);
if ($target.hasClass("myclass")) {
// do something
}
});
You can bind a single click event to a page for all elements, no matter if they are already on that page or if they will arrive at some future time, like that:
$(document).bind('click', function (e) {
var target = $(e.target);
if (target.is('.myclass')) {
e.preventDefault(); // if you want to cancel the event flow
// do something
} else if (target.is('.myotherclass')) {
e.preventDefault();
// do something else
}
});
Been using it for a while. Works like a charm.
In jQuery 1.7 and later, it is recommended to use .on() in place of bind or any other event delegation method, but .bind() still works.
Binds a handler to an event (like click) for all current - and future - matched element. Can also bind custom events.
link text
$(function(){
$(".myclass").live("click", function() {
// do something
});
});
If your on jQuery 1.3+ then use .live()
Binds a handler to an event (like
click) for all current - and future -
matched element. Can also bind custom
events.
You want to use the live() function. See the docs.
For example:
$("#anchor1").live("click", function() {
$("#anchor1").append('<a class="myclass" href="#">test4</a>');
});
This question already has answers here:
Event binding on dynamically created elements?
(23 answers)
Closed 8 years ago.
Suppose I have some jQuery code that attaches an event handler to all elements with class .myclass.
For example:
$(function(){
$(".myclass").click( function() {
// do something
});
});
And my HTML might be as follows:
<a class="myclass" href="#">test1</a>
<a class="myclass" href="#">test2</a>
<a class="myclass" href="#">test3</a>
That works with no problem.
However, consider if the .myclass elements were written to the page at some future time.
For example:
<a id="anchor1" href="#">create link dynamically</a>
<script type="text/javascript">
$(function(){
$("#anchor1").click( function() {
$("#anchor1").append('<a class="myclass" href="#">test4</a>');
});
});
</script>
In this case, the test4 link is created when a user clicks on a#anchor1.
The test4 link does not have the click() handler associated with it, even though it has class="myclass".
Basically, I would like to write the click() handler once and have it apply to both content present at page load, and content brought in later via AJAX / DHTML. Any idea how I can fix this?
I am adding a new answer to reflect changes in later jQuery releases. The .live() method is deprecated as of jQuery 1.7.
From http://api.jquery.com/live/
As of jQuery 1.7, the .live() method is deprecated. Use .on() to attach event handlers. Users of older versions of jQuery should use .delegate() in preference to .live().
For jQuery 1.7+ you can attach an event handler to a parent element using .on(), and pass the a selector combined with 'myclass' as an argument.
See http://api.jquery.com/on/
So instead of...
$(".myclass").click( function() {
// do something
});
You can write...
$('body').on('click', 'a.myclass', function() {
// do something
});
This will work for all a tags with 'myclass' in the body, whether already present or dynamically added later.
The body tag is used here as the example had no closer static surrounding tag, but any parent tag that exists when the .on method call occurs will work. For instance a ul tag for a list which will have dynamic elements added would look like this:
$('ul').on('click', 'li', function() {
alert( $(this).text() );
});
As long as the ul tag exists this will work (no li elements need exist yet).
Sometimes doing this (the top-voted answer) is not always enough:
$('body').on('click', 'a.myclass', function() {
// do something
});
This can be an issue because of the order event handlers are fired. If you find yourself doing this, but it is causing issues because of the order in which it is handled.. You can always wrap that into a function, that when called "refreshes" the listener.
For example:
function RefreshSomeEventListener() {
// Remove handler from existing elements
$("#wrapper .specific-selector").off();
// Re-add event handler for all matching elements
$("#wrapper .specific-selector").on("click", function() {
// Handle event.
}
}
Because it is a function, whenever I set up my listener this way, I typically call it on document ready:
$(document).ready(function() {
// Other ready commands / code
// Call our function to setup initial listening
RefreshSomeEventListener();
});
Then, whenever you add some dynamically added element, call that method again:
function SomeMethodThatAddsElement() {
// Some code / AJAX / whatever.. Adding element dynamically
// Refresh our listener, so the new element is taken into account
RefreshSomeEventListener();
}
Hopefully this helps!
Regards,
After jQuery 1.7 the preferred methods are .on() and .off()
Sean's answer shows an example.
Now Deprecated:
Use the jQuery functions .live() and .die(). Available in
jQuery 1.3.x
From the docs:
To display each paragraph's text in an
alert box whenever it is clicked:
$("p").live("click", function(){
alert( $(this).text() );
});
Also, the livequery plugin does this and has support for more events.
If you're adding a pile of anchors to the DOM, look into event delegation instead.
Here's a simple example:
$('#somecontainer').click(function(e) {
var $target = $(e.target);
if ($target.hasClass("myclass")) {
// do something
}
});
You can bind a single click event to a page for all elements, no matter if they are already on that page or if they will arrive at some future time, like that:
$(document).bind('click', function (e) {
var target = $(e.target);
if (target.is('.myclass')) {
e.preventDefault(); // if you want to cancel the event flow
// do something
} else if (target.is('.myotherclass')) {
e.preventDefault();
// do something else
}
});
Been using it for a while. Works like a charm.
In jQuery 1.7 and later, it is recommended to use .on() in place of bind or any other event delegation method, but .bind() still works.
Binds a handler to an event (like click) for all current - and future - matched element. Can also bind custom events.
link text
$(function(){
$(".myclass").live("click", function() {
// do something
});
});
If your on jQuery 1.3+ then use .live()
Binds a handler to an event (like
click) for all current - and future -
matched element. Can also bind custom
events.
You want to use the live() function. See the docs.
For example:
$("#anchor1").live("click", function() {
$("#anchor1").append('<a class="myclass" href="#">test4</a>');
});
This question already has answers here:
Event binding on dynamically created elements?
(23 answers)
Closed 5 years ago.
I've been having a lot of trouble attaching the click event to a JQuery object before adding it to the DOM.
Basically I have this button that my function returns, then I append it to the DOM. What I want is to return the button with its own click handler. I don't want to select it from the DOM to attach the handler.
My code is this:
createMyButton = function(data) {
var button = $('<div id="my-button"></div>')
.css({
'display' : 'inline',
'padding' : '0px 2px 2px 0px',
'cursor' : 'pointer'
}).append($('<a>').attr({
//'href' : Share.serializeJson(data),
'target' : '_blank',
'rel' : 'nofollow'
}).append($('<image src="css/images/Facebook-icon.png">').css({
"padding-top" : "0px",
"margin-top" : "0px",
"margin-bottom" : "0px"
})));
button.click(function () {
console.log("asdfasdf");
});
return button;
}
The button that is return is unable to catch the click event. However, if I do this (after the button is added to the DOM):
$('#my-button').click(function () {
console.log("yeahhhh!!! but this doesn't work for me :(");
});
It works... but not for me, not what I want.
It seems to be related to the fact that the object is not yet a part of the DOM.
Oh! By the way, I'm working with OpenLayers, and the DOM object that I'm appending the button to is an OpenLayers.FramedCloud (Which is not yet a part of the DOM but will be once a couple of events are triggered.)
Use this. You can replace body with any parent element that exists on dom ready
$('body').on('click', '#my-button', function () {
console.log("yeahhhh!!! but this doesn't work for me :(");
});
Look here http://api.jquery.com/on/ for more info on how to use on() as it replaces live() as of 1.7+.
Below lists which version you should be using
$(selector).live(events, data, handler); // jQuery 1.3+
$(document).delegate(selector, events, data, handler); // jQuery 1.4.3+
$(document).on(events, selector, data, handler); // jQuery 1.7+
I am really surprised that no one has posted this yet
$(document).on('click','#my-butt', function(){
console.log('document is always there');
})
If you are unsure about what elements are going to be on that page at that time just attach it to document.
Note: this is sub-optimal from performance perspective - to get maximum speed one should try to attach to the nearest parent of element that is going to be inserted.
Try this.... Replace body with parent selector
$('body').on('click', '#my-button', function () {
console.log("yeahhhh!!! but this doesn't work for me :(");
});
Try:
$('body').on({
hover: function() {
console.log("yeahhhh!!! but this doesn't work for me :(");
},
click: function() {
console.log("yeahhhh!!! but this doesn't work for me :(");
}
},'#my-button');
jsfiddle example.
When using .on() and binding to a dynamic element, you need to refer to an element that already exists on the page (like body in the example). If you can use a more specific element that would improve performance.
Event handlers are bound only to the currently selected elements; they
must exist on the page at the time your code makes the call to .on().
To ensure the elements are present and can be selected, perform event
binding inside a document ready handler for elements that are in the
HTML markup on the page. If new HTML is being injected into the page,
select the elements and attach event handlers after the new HTML is
placed into the page. Or, use delegated events to attach an event
handler, as described next.
Src: http://api.jquery.com/on/
You have to append it. Create the element with:
var $div = $("<div>my div</div>");
$div.click(function(){alert("clicked")})
return $div;
Then if you append it will work.
Take a look at your example here and a simple version here.
Complement of information for those people who use .on() to listen to events bound on inputs inside lately loaded table cells; I managed to bind event handlers to such table cells by using delegate(), but .on() wouldn't work.
I bound the table id to .delegate() and used a selector that describes the inputs.
e.g.
HTML
<table id="#mytable">
<!-- These three lines below were loaded post-DOM creation time, using a live callback for example -->
<tr><td><input name="qty_001" /></td></tr>
<tr><td><input name="qty_002" /></td></tr>
<tr><td><input name="qty_003" /></td></tr>
</table>
jQuery
$('#mytable').delegate('click', 'name^=["qty_"]', function() {
console.log("you clicked cell #" . $(this).attr("name"));
});
Does using .live work for you?
$("#my-button").live("click", function(){ alert("yay!"); });
http://api.jquery.com/live/
EDIT
As of jQuery 1.7, the .live() method is deprecated. Use .on() to attach event handlers. Users of older versions of jQuery should use .delegate() in preference to .live().
http://api.jquery.com/on/
On event
$('#my-button').on('click', function () {
console.log("yeahhhh!!! but this doesn't work for me :(");
});
Or add the event after append
jQuery .on method is used to bind events even without the presence of element on page load.
Here is the link
It is used in this way:
$("#dataTable tbody tr").on("click", function(event){
alert($(this).text());
});
Before jquery 1.7, .live() method was used, but it is deprecated now.
Maybe bind() would help:
button.bind('click', function() {
alert('User clicked');
});
Say I have this code in my page:
<script language="javascript">
$(document).ready(function() {
$(".test").click(function() {
alert('Hello');
});
});
</script>
Why doesn't the previous code apply to elements with the class "test" which I add later to the document like this for example:
$('body').append('<p class="test">Test</p>');
Because what happens is that when I click the previous <p> tag nothing happens.
Also, if I have this:
<div id="first">Edit me.<div id="second">Save me.</div></div>
Can I do what the text describes? that is, controlling the content of the #first div without affecting the content of the #second div?
Thank you.
The problem is that .click() does only apply a listener for elements that are available in the DOM when the method is executed. You should take a look at .on() instead.
With .on() you can delegate the event, like this for instance:
$("body").on("click", ".test", function() {
alert('Hello');
});
Now any element (current and future) with the class test available within your body will have a click-event listener.
live is deprecated as of 1.7, use on
http://api.jquery.com/on/
try using on() listener:
$(document).on("click",".test", function() {
alert('Hello');
});
When you bind events to elements they only bind to those elements that have already been created. So you need to run the 'bind' command again on the new elements.
Alternatively, you can use on('click') which will bind the event to existing and all future elements.
Because at the time you attach your event handler the object doesnt exist yet. You cant subscribe to elements that dont exist. You can use the Live method for this.
http://api.jquery.com/live/
It seems those are deprecated (thanks #Anthony Grist). Use On, or delegate() instead.
http://api.jquery.com/on/
http://api.jquery.com/delegate/
$('div').on('click', function()
{
//Do something
});
you should use "on" to bind events with the elements that are added after the script is interpreted.
$(document).on("click", selector, function(e){
//do something
});
If you need to apply the click to later added tags, you should use live on
$(document).on('click','.test',function() { });
EDIT: #Anthony your're right. live is deprecated. Updated the code
I would like to delegate the event one for the click. Does anyone know if it is possible to do it?
I'm going to assume that you want the event to fire only once PER matched element rather than unbind entirely on the first click.
I'd implement it like so:
$('#container').delegate('.children', 'click', function() {
if($(this).data('clicked')) {
return;
}
// ... your code here ...
$(this).data('clicked', true);
});
This will fire only once per element. Technically, it fires everytime but is flagged the first time it is clicked so the code will not execute again.
The inherent problem of simulating a .one() handler w/ delegate is that using .one() each element that was matched in the selector is bound its own event handler. So when it is fired for the first time it unbinds/removes the handler from that element. You can't do that with .delegate() because only a SINGLE handler is being used for ALL the matched elements.
While the code above simulates it perfectly, it is still somewhat hackish because it doesn't literally do the same thing that .one() does (unbinding an event handler).
Since this post is a few years old, I just wanted to provide a complete updated example for more contemporary readers (2015). The logic is no different from the other answers here, but jQuery's methods have evolved since 2011. Specifically:
As of jQuery 1.7, .delegate() has been superseded by the .on() method.
jQuery delegate()
// define output element
var $output = $('div#output');
// attach delegated click handler
$(document).on('click', 'button', function() {
// define clicked element
var $this=$(this);
// if this element has already been clicked, abort
if ($this.data('clicked')) {
return false;
}
// perform click actions
$output.append("clicked " + $this.html() + "<br />");
// mark this element as clicked
$this.data('clicked',true);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button>One</button>
<button>Two</button>
<button>Three</button>
<div id="output"></div>
I'm sure there is a neat way of doing it, but a simple way to do it would be something like this:
<script>
$(document).ready(function(){
$("#container").delegate('.clickers', 'click', function(){
if($(this).data("clicked")==null){
$(this).data("clicked", "true");
$("#container").append($(this).html());
}
});
});
</script>
<div class="clickers" clicked="false"></div>
<div class="clickers" clicked="false"></div>
EDIT: Thanks to the comments below I decided to use data, now this doesn't screw the DOM all up for w3c standards.