Javascript appendChild callback?

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I need to add an HTML5 video to a page with the following code:


My problem is, the second line returns 0 because it takes a while for the video tag to load the video it's going to play. If I manually type the second line in the console once the page is loaded, I get the actual value. Is there a better way to get this value than using timeouts to periodically check if the value's been updated?

Javascript is one-threaded. You should to drop your code to event-loop, this allows the js with DOM work.

Just try followed:


document Entity.appendChild asyncrony in "Using JavaScript and , appendChild asyncrony in "Using JavaScript and DOM APIs" #2366 and none of the attributes were available in init or play callbacks either. If the given child is a reference to an existing node in the document, appendChild () moves it from its current position to the new position (there is no requirement to remove the node from its parent node before appending it to some other node). This means that a node can't be in two points of the document simultaneously.

Add a video.onloadstart event to the element.

function getClientWidth() {

Read more here.

Introduction: callbacks, function loadScript(src) { // creates a <script> tag and append it to the page // this causes the script with given src to start loading and run when� Definition and Usage. The appendChild() method appends a node as the last child of a node. Tip: If you want to create a new paragraph, with text, remember to create the text as a Text node which you append to the paragraph, then append the paragraph to the document.

I needed to do something similar and stumbled upon this question, as I though maybe there is a callback for this. Turns out there is not. So here is another way of doing it using Window.requestAnimationFrame().

It would look something like this:

// Prepare the new element
let video = document.createElement('video');

// Add the element to the DOM. Works with any element

// Updateing the DOM will cause a re-render, which we can hook into
window.requestAnimationFrame(() => {
<div id="mydiv">Video goes here:</div>

JavaScript appendChild() By Practical Examples, In this tutorial, you will learn how to use the JavaScript appendChild() method to add a node to the end of the list of child nodes of a specified parent node. JavaScript appendChild method. In JavaScript if we want to append the HTML child element to any previously existing element then we can use appendChild() to add the child element. In JavaScript if we want to append the HTML child element to any previously existing element then we can use appendChild() to add the child element.

How to Load Third-Party Scripts Dynamically in JavaScript, appendChild(script); script.onload = () => { if (callback) callback(); }; } if ( existingScript && callback) callback(); };. The idea here is that we create a function that� In the above code, we have asked to pass the three parameters as id, url and callback function. In the function, we will check if the script exists in the dom then execute the callback function. If it’s not exist in the dom then load it by creating the script element and append it in body. Dynamically load a script text

That’s called a “callback-based” style of asynchronous programming. A function that does something asynchronously should provide a callback argument where we put the function to run after it’s complete. Here we did it in loadScript, but of course it’s a general approach. Callback in callback

The attributeChangedCallback () callback is run whenever one of the element's attributes is changed in some way. As you can see from its properties, it is possible to act on attributes individually, looking at their name, and old and new attribute values.

  • appendChild callback? Are you looking for an event instead? Eg loadedmetadata for example?
  • Exactly! Thanks! I didn't know this. If you post an answer saying this I'll accept it.