Check If a JavaScript File Is Already Included

Overview

A simple JavaScript snippet to detect whether a script has already been loaded on the page.

Originally published on Jang Keyte's Blog.

This article covers Check If a JavaScript File Is Already Included — practical notes from real-world web development experience.

Code Examples

function isScriptAlreadyIncluded(src){
    var scripts = document.getElementsByTagName("script");
    for(var i = 0; i < scripts.length; i++)
       if(scripts[i].getAttribute('src') == src) return true;
    return false;
}

Read More

For the full Vietnamese version, switch language using the VI | EN toggle above, or visit the original post.