If we want to retrieve elements of more than one class, we can specify multiple class names by separating all class names with space. GetElementsB圜lassName() method is used to retrieve a collection or array of all the HTML elements that are child nodes of the element on which this method is called and have the class as mentioned in the parameter of this method. In this article, we will learn how we can access an element(s) based on its class. There are predefined methods and functions provided to access HTML elements in javascript that are mentioned in the Document interface. Whenever we want to access and get an element present in the DOM of HTML in javascript, we can get the element either based on its id, class or name. Introduction to JavaScript Get Element by Class Update 2022 Fastest and shortest solution. Examples of live NodeLists are Node.childNodes and the return value of getElementsByName. It's notable, that also live NodeLists exist. If you really need a live list of elements, use the closest possible common ancestor element as the context instead of document. querySelectorAll, which gives you a static NodeList and a more flexible way to select elements. Instead, convert the collection to array, and iterate that array. If a collection is live, then the attributes and methods on that object must operate on the actual underlying data, not a snapshot of the data. In practice this means, that every time you access a member of a live collection (including the length), the browser traverses the entire document to find the specific element. To achieve a reliable collection, the DOM is traversed every time a collection is accessed, in every current implementation of HTMLCollection. Live collections are problematic because there's no way to keep the collection updated under the hood. Whereas HTMLCollection has two methods, NodeList has five methods, including NodeList.forEach, which can be used to iterate through a NodeList. There are remarkable differencences between these two lists. getElementsBy* methods return a live HTMLCollection, not a NodeList, getElementsByName being an exception. The solution for me was to clone each element into an array first and pass the array ono-by-one into Distribute() afterwards. Important fact I forgot to mention is that there might be one slide inside another, this is actually what changes the slides variable as I have just found out thanks to user Alohci. What is the correct way to iterate through NodeList in my case? I was thinking about filling some temporary array, but am not sure how to do that. The variable slides act's really un-deterministicaly, through every iteration it changes its length and order of elements wildly. For-each loop structure does not help either. being changed inside function Distribute (the DOM tree is being changed inside this function, and cloning of certain nodes happen). However this does not do the magic for me, because getElementsB圜lassName does not actually return array, but a NodeList, which is. I want to do something like this (as outlined for example here or here): var slides = getElementsB圜lassName("slide") I have function Distribute(element) which takes an element as input and does the distribution. I am initing web page via the window.onload, I have to find bunch of elements by their class name ( slide) and redistribute them into different nodes based on some logic.
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