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
$('body').on('click','.atnd_modal', function(){
alert("dsfds");
});
Related
The Code:
if($('.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
});
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!
How come the second code better than the first? Why not grab the .vote a directly, instead of grabbing the body tag? I'm creating a voting system using AJAX/JSON/PHP:
$('.vote a').click(function() {});
$('body').on('click','.vote a',function(){});
The second example is a delegated event handler. It is attaching the click event to the body so that it can be applied to any .vote a element which are appended to the DOM after the page has loaded.
You may also see a performance increase from using the delegated model even when there are no elements appended after DOMReady, if there are a lot of elements you need to attach the same event handler to.
That kind of doing is called as event-delegation. And that would be useful when binding events for the elements which are created at run time(dynamically).
I have some javascript that I inherited for my job. In this javascript we have a side bar that is constantly updated(every 1 - 10 or so minutes). In the script we parse and process the AJAX from the server and then we call an interesting function.
function renewClicks(){
$('.classElem').unbind('click');
$('.classElem2').unbind('click');
$('.classElem3').unbind('click');
$('.classElem').click(elm1funct);
$('.classElem2').clikc(elm2funct);
$('.classElem3').click(elm3funct);
}
Where .classElem is a css class selector that is appended to each image that is added to the page. And elmfunct is a function that is written to handle the click. This runs on each update (deauthorizing valid already added elements and then re adding them all). I want to know if there is a way I can possibly attach a listener on the body element in the DOM so that all of the image elements added to the page and that inherit the css class will already be handled and therefore not unregistered and re-registered on each update.
Thank you for any info you can provide.
You could try this:
$('body').on('click','.classElem',elm1funct)
.on('click','.classElem2',elm2funct)
.on('click','.classElem3', elm3funct);
From jQuery's docs:
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.
As #crush mentioned, use an event delegated approach to avoid unbinding and re-binding events:
$(document).on('click', '.classElem', elm1funct);
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
});