I'm using .on()
to bind events of divs that get created after the page loads. It works fine for click, mouseenter... but I need to know when a new div of class MyClass has been added. I'm looking for this:
$('#MyContainer').on({ wascreated: function () { DoSomething($(this)); } }, '.MyClass');
How do I do this? I've managed to write my entire app without a plugin and I want to keep it that way.
Thanks.
The hasClass() method checks if any of the selected elements have a specified class name. If ANY of the selected elements has the specified class name, this method will return "true".
The actual answer is "use mutation observers" (as outlined in this question: Determining if a HTML element has been added to the DOM dynamically), however support (specifically on IE) is limited (http://caniuse.com/mutationobserver). So the actual ACTUAL answer is "Use mutation observers....
To replace a class with another class, you can remove the old class using jQuery's . removeClass() method and then add the new class using jQuery's . addClass() method.
Previously one could hook into jQuery's domManip
method to catch all jQuery dom manipulations and see what elements where inserted etc. but the jQuery team shut that down in jQuery 3.0+ as it's generally not a good solution to hook into jQuery methods that way, and they've made it so the internal domManip
method no longer is available outside the core jQuery code.
Mutation Events have also been deprecated, as before one could do something like
$(document).on('DOMNodeInserted', function(e) { if ( $(e.target).hasClass('MyClass') ) { //element with .MyClass was inserted. } });
this should be avoided, and today Mutation Observers should be used instead, which would work like this
var observer = new MutationObserver(function(mutations) { mutations.forEach(function(mutation) { console.log(mutation) if (mutation.addedNodes && mutation.addedNodes.length > 0) { // element added to DOM var hasClass = [].some.call(mutation.addedNodes, function(el) { return el.classList.contains('MyClass') }); if (hasClass) { // element has class `MyClass` console.log('element ".MyClass" added'); } } }); }); var config = { attributes: true, childList: true, characterData: true }; observer.observe(document.body, config);
Here is my plugin that does exacly that - jquery.initialize
Useage is the same like you'd use .each
function, but with .initialize
function on element, difference from .each
is it will also initialize elements added in future without any additional code - no matter if you add it with AJAX or anything else.
Initialize have exacly the same syntax as with .each function
$(".some-element").initialize( function(){ $(this).css("color", "blue"); });
But now if new element matching .some-element selector will appear on page, it will be instanty initialized. The way new item is added is not important, you dont need to care about any callbacks etc.
$("<div/>").addClass('some-element').appendTo("body"); //new element will have blue color!
Plugin is based on MutationObserver
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