When Should I Load JavaScript?

Does JavaScript load before HTML?

It’s fine to put the JS links at the bottom of the HTML, just before the tag.

Otherwise you need some extra JS to tell the script only to run when the page has loaded..

Do you put JavaScript in head or body?

JavaScript in or You can place any number of scripts in an HTML document. Scripts can be placed in the , or in the section of an HTML page, or in both.

How do I know if a HTML page is loaded?

The cross-browser way to check if the document has loaded in pure JavaScript is using readyState .if (document. readyState === ‘complete’) { // The page is fully loaded } … let stateCheck = setInterval(() => { if (document. readyState === ‘complete’) { clearInterval(stateCheck); // document ready } }, 100); … document.

Which is the alternative to the load event?

DOMContentLoaded and readystatechange are alternatives to the load event: they are triggered sooner, when the document and its elements are ready to manipulate, but before external resources are fully loaded.

Why JavaScript should be at the bottom?

When you place your JavaScript links at the bottom of your HTML body, it gives the HTML time to load before any of the JavaScript loads, which can prevent errors, and speed up website response time.

Should jQuery be in head or body?

It’s always a good practice to add jQuery code in footer i.e. just before the closing tag. If you have not done that, then use the defer attribute. The defer attribute is used to specify that the script execution occurs when the page loads.

Where do I place JavaScript?

The best place to write your JavaScript code is at the end of the document after or right before the tag to load the document first and then execute js code.

Can we write JavaScript in HTML body?

You can add JavaScript code in an HTML document by employing the dedicated HTML tag