How to wait for the HTML or DOM to load using JavaScript?

Published August 25, 2020

To do operations and to ensure the application runs smoothly while performing operations on DOM, we have to wait till DOM or the whole HTML elements loads.

There are 2 types of load event we can listen on the DOM:

  • load event on the window object
  • DOMContentLoaded event on the document object

The load event in the window object

The load event in the window object waits until the DOM is fully loaded like all the resources including the images, iframes, etc is loaded.

The load event is triggered after everything on a page is loaded.

To do that, Let's add an event listener to listen for the load event in the global window object.

// listen for load event in the window
window.addEventListener("load", function () {
  // do things after the DOM loads fully
  console.log("Everything is loaded");
});

The DOMContentLoaded event in the document object

The DOMContentLoaded event in the document object is a bit different from the load event as this event is triggered when the browser loads the HTML and the DOM is built. It won't wait for resources like images, iframes etc.to load.

To do that, Let's add an event listener to listen for the DOMContentLoaded event in the document object.

// listen for DOMContentLoaded event in teh document
document.addEventListener("DOMContentLoaded", function () {
  // do things after the DOM loads partially
  console.log("DOM is loaded");
});

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