Event stops working after dynamic ul li changes - javascript

The Code:
if($('.info-dropdown').length){
setTimeout(function(){
$('li').has('input[type="checkbox"]').on('click', function(){
$(this).find('.brand-checkbox').parent().toggleClass('active');
});
}, 10);
}
The Problem: This code detects event click on element checkbox. After dynamically changing this ul li the event stops working.
Note: These checkboxes are from bootstrap dropdown menu.

To bind event for dynamic HTML, You can follow below code :
$('containerSelector').on('eventName', 'mainElementSelector' function(e){
});
Realtime example
$("ul").on("click", "li:has(:checkbox)", function(){
});

Event handlers added directly to an object are added only to that specific DOM object. If you then add or replace more DOM objects, those DOM object won't have any of these event handlers on them. You will have to either manually add the event handlers after you create or replace the DOM objects or you will have to switch to using delegated event handling.
Delegated event handling attaches the event handler to a common parent object (that is not replaced) and uses the fact that many events bubble up the parent chain in order to process the event from the common parent. This allows you to freely create or replace child elements, but still have one event handler that works for all child objects.
You can read a lot more about how to do delegated event handling in these other answers:
jQuery .live() vs .on() method for adding a click event after loading dynamic html
Does jQuery.on() work for elements that are added after the event handler is created?
JQuery Event Handlers - What's the "Best" method
As illustrated in those referenced answers, the general idea is like this:
$("#staticParentSelector").on("click", ".selectorForDynamicChildren", function(e) {
// event handler code here
});

Related

Click event is not bound to dynamic elements when appendTo() is used

I know that for dynamic dom elements I need to use jQuery.fn.on or delegate, but if I 'move' the elements container appending to another elements in the dom, the click doesn't work anymore.
Here is the the jsFiddle to reproduce the issue:
http://jsfiddle.net/j0L7c51f/
Currently I'm using the following bind method:
$('#commoditySelector').on( 'click', 'li.available', function() {
var cmID = $(this).attr('data-cmid');
$('#debug').html('commoditySelected: '+ cmID);
});
If I comment out the code line where I move the ul element using appendTo(), the click event bound works fine.
The issue is caused by your use of mousemove, not the delegated event handler, as the HTML is being re-built every single time the mouse moves. This means that the delegated event handler is correctly fired on a clicked element, but that element is immediately removed from the DOM, so the event is cancelled before it propagates up the DOM to be processed.
To fix this issue, use the mouseenter event on the a instead:
$('#commodityCategories li a').mouseenter(function(e) {
// your code...
});
Updated fiddle

Js click property not working on html loaded by js

I have created a dynamic page in which i am loadin 10 element by default. after that if user scroll doun i am apppending more element to this page by js (appending data by ajax).
and on click of a tag i am doing some js work
I am using
$('.atnd_modal').click(function(){
alert("dsfds");
});
not
onclick ="function()" and i dont want to do that onclick.
Problem i am facing that this js is working perfectely for first 10 result but after that it stop working for the block i have appended by js.
how can to do it working for both the cases ??
Try jquery on() for event delegation. It will work on dynamic loaded element on DOM also.
$('body').on('click','.atnd_modal', function(){
alert("dsfds");
});
Delegated events have the advantage that they can process events from
descendant elements that are added to the document at a later time.
Your click event is not working because when you use click() it will attach this handler to all elements having atnd_modal class, but when new element loading in DOM that event is not attached automatically with new element. For previous elements it will work fine but for new element it won't. So here comes Delegated events. We shall attach event to parent element with on() or delegate()
If you want to bind an event to the dynamically added new elements you have to use event delegation :-
Delegated events have the advantage that they can process events from
descendant elements that are added to the document at a later time. By
picking an element that is guaranteed to be present at the time the
delegated event handler is attached, you can use delegated events to
avoid the need to frequently attach and remove event handlers.
Change your code like this, use Jquery On
$('body').on('click','.atnd_modal', function(){
alert("dsfds");
});

How do I attach a JS click event to an AJAX loaded button?

I need to attach a JavaScript click listener to an add new record confirmation on a DevExpress gridview.
I can't use a regular click event listener as it's loaded via AJAX integrated into the control. I also have no access to the button's code so am unable to extend it.The only thing I do have is the button name.
Ideally I want to listen for the appearance of the button on the DOM and then attach the listener, is there any way to do this?
You do not need to wait for the appearance of the button in the DOM.
Just use a delegated event handler attached to a non-changing ancestor of the dynamic elements.
e.g.
$(document).on('click', '.someclass', function(){
///
});
If you only have the element name for the button use an attribute selector:
e.g.
$(document).on('click', '[name="somename"]', function(){
///
});
Delegated events work by listening for events bubbling up to a non-changing ancestor (document is the default if nothing closer is available). It then applies the selector at event time (not at event registration time). It then calls the function for any matching element that caused the event.
The end result is that it will work with elements that may exist later, when the event occurs.
Note: if nothing is closer to the dynamic content, use document, but do not use 'body' as styling can make it have a zero height and delegated mouse events will not work!

Attach click handler to dynamically generated anchor tag

I dynamically generate some markup and inject it into the DOM like this:
content+='<td><a class="reportLink" onclick="showReport();return false;" href="'+layerResults.features[i].attributes['Information_External']+'">Info</a></td>';
I know it would be better to use jQuery to attach the click handler instead of using an inline handler.
The problems are, even using an inline handler and a function like this:
function showReport() {
console.log('stopped');
}
Still doesn't prevent the link from navigating away from my page.
The second problem is, when I try using
jQuery('.reportLink'.on('click', function(e) {
e.preventDefault();
console.log('clicked');
});
The event never gets attached. I'm using jQuery 1.7.2.
This is driving me a bit insane as it's a simple task I've done about a zillion times in jQuery <= 1.5.
Delegate the event handler to a parent element that exists at the time the dom is loaded. You can replace body with that parent.
jQuery('body').on('click','.reportLink', function(e){
e.preventDefault();
console.log('clicked');
});
from jquery docs .on()
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.
Delegated events have the advantage that they can process events from descendant elements that are added to the document at a later time. By picking an element that is guaranteed to be present at the time the delegated event handler is attached, you can use delegated events to avoid the need to frequently attach and remove event handlers. This element could be the container element of a view in a Model-View-Controller design, for example, or document if the event handler wants to monitor all bubbling events in the document. The document element is available in the head of the document before loading any other HTML, so it is safe to attach events there without waiting for the document to be ready.
In addition to their ability to handle events on descendant elements not yet created, another advantage of delegated events is their potential for much lower overhead when many elements must be monitored. On a data table with 1,000 rows in its tbody, this example attaches a handler to 1,000 elements:
to prevent it from navigating away, enter this right after "console.log('stopped');
return false;
for the second one, i usually use this syntax, maybe it'll help:
jQuery(".reportLink").click(function() {
//do something
});

Does attaching event handler with a class selector affects dynamically added elements of that class?

I am using jQuery to attach a function to my click event for an entire class. For example:
$(".clickDiv").click(function(){
$(this).hide();
});
On my client-side javascript, I create more .clickDiv instances dynamically.
Do I need to call the $(".clickDiv).click(function...) again, or will the new instances automatically have that function bound to the click event?
Yes you do, unless you use a delegate event
like this:
$('#container').on('click', '.clickDiv', function() {
$(this).hide();
});
on docs:
If selector is omitted or is null, the event handler is referred to as direct or directly-bound. The handler is called every time an event occurs on the selected elements, whether it occurs directly on the element or bubbles from a descendant (inner) element.
When a selector is provided, the event handler is referred to as delegated. The handler is not called when the event occurs directly on the bound element, but only for descendants (inner elements) that match the selector. jQuery bubbles the event from the event target up to the element where the handler is attached (i.e., innermost to outermost element) and runs the handler for any elements along that path matching the selector.
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.
Delegated events have the advantage that they can process events from descendant elements that are added to the document at a later time. By picking an element that is guaranteed to be present at the time the delegated event handler is attached, you can use delegated events to avoid the need to frequently attach and remove event handlers. This element could be the container element of a view in a Model-View-Controller design, for example, or document if the event handler wants to monitor all bubbling events in the document. The document element is available in the head of the document before loading any other HTML, so it is safe to attach events there without waiting for the document to be ready.
Just because too much people here suggested you should use live, live is deprecated since version 1.7 by on and was replaced in version 1.4.3 by delegate
$(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 attaching an event like :
$('body').on('click', 'button[data-tracking], a[data-tracking]',
function(event) { console.log($(event.target));
});
and want to get to the target of element which is set up as :
<pre> <[]a data-tracking="hello" href="hello">
\<\span\>test now\<\/span\>
\<\/a\>
</pre>
it does work perfectly, but event.target gives me "span" element but what i want is "a" element so that I could get to value of data-tracking attribute.
This will bind the event to all new instances
$('.clickDiv').live('click', function() {
$(this).hide();
});
http://api.jquery.com/live/

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