What Is HTML/JS Onload and How Does It Work?
Loading a webpage includes waiting for the page content, images, and other resources to be completely loaded.
Some webpages ensure that certain functionality doesn’t occur until everything has finished loading. An example includes retrieving data from a database only after the page has loaded.
There are different ways you can check if a webpage is fully loaded. You can listen to events using JavaScript event handlers, use thewindow.onloadJavaScript event, or theonloadHTML attribute.
How to Use onLoad With the Body HTML Element
you’re able to use JavaScript events to check if the body of the webpage has loaded. You will need an HTML file with some page content and a JavaScript file to execute the code.
The code used in this project is available in aGitHub repositoryand is free for you to use under the MIT license.
We recommend using the JavaScript event listeners and thewindow.onloadmethod over the HTMLonloadattribute because keeping the behavior and content of the webpage separate is a good practice. Also, the JavaScript event listeners provide more compatibility and flexibility over the other two methods.
How to Use onLoad With the Image HTML Element
You can also use the onload event to execute code when other elements load on the page. An example of this is the image element.
How to Use onLoad When Loading the JavaScript
You can use the HTML onload attribute to check if the browser has finished loading the JavaScript file. There is no equivalent JavaScript onload event for the script tag.
Loading Webpages in the Browser
Now you can use functions and events to execute certain code when a webpage has completed loading. Loading pages are a big factor in creating a smooth and seamless user experience.
You can learn more about how you can integrate more interesting loading page designs into your website.
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