How Can I Ensure JavaScript Executes After a Page Fully Loads?

Executing JavaScript Post Page Load

When working with external scripts, it's crucial to ensure their execution occurs after the page has fully loaded. This allows for seamless interaction with page elements, such as the '

'. In this article, we explore various techniques to achieve this behavior.

Using 'defer' Attribute

The 'defer' attribute can be used to delay the execution of scripts until after the HTML document has parsed. By adding 'defer' to the '<script>' tag, the script will execute once the HTML has been fully loaded and in-RAM.</script>

<script src="deferMe.js" defer></script>

Using Event Handlers

Another approach involves using event handlers that trigger when the page has loaded. These handlers can be attached to the '

' element or the 'window' object.

'onload' Event

The 'onload' event fires when the entire page has loaded. Attaching a script to the 'onload' event ensures that the script executes after page load.

'document.onload' or 'window.onload'

Alternatively, you can use the 'document.onload' or 'window.onload' event handlers. These handlers perform similarly to 'onload', but they are more standard and unobtrusive.

document.onload = function ...;

window.onload = function ...;

In conclusion, by utilizing these techniques, you can effectively execute JavaScript after page load, ensuring that your scripts have access to all necessary page elements and providing a better user experience.

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