JS include_once

I created a webpage with two side-by-side divs. The first div functions as a navigation tree, allowing users to click and load pages on the right div using AJAX. I've successfully added a JavaScript file that is required when certain pages are loaded.

Everything is functioning correctly, but each time a user views the page, the corresponding JavaScript file is included again. This seems like a significant redundancy issue, especially since my knowledge of JavaScript development is limited.

Question: Is there a way to check if a JS file has already been included before adding it again?

javascript

Answer №1

One possible solution is to maintain a list of already loaded script names in an array. This way, when a new load request is made, you can quickly check if the script is already present in the array.

Another approach could be to inspect the src attribute of your script elements when loading new scripts by dynamically adding them to the document. However, I have encountered some difficulties with this method in the past.

Answer №2

Make sure to incorporate the JavaScript code directly into the main HTML page, rather than the one being accessed.

Answer №3

In order to minimize the chances of the page being loaded multiple times, consider implementing a guard clause within your JavaScript file to avoid redefinition:

if(typeof includedFile === "undefined")
{
    var includedFile = true;
    //add remaining code here
}

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