How do I include javascript files in an other in a browser-agnostic manner

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I have a number of JavaScript modules that contain code that should be broken out into separate modules. However, if I split them up, I must include <script> statements in the HTML files to include them prior to their use. For example, say I have JavaScript code that includes ajax, cookie, font sizing, event handler, and some general purpose utilities. I would like to split these up into:

ajax.js
cookie.js
font_sizing.js
event_handling.js
utilities.js

and then include the files, as necessary, in the JavaScript file. If I break them out but do not have an inclusion mechanism, I am forced to include something like the following in my HTML

<script src="Scripts/ajax.js"></script>
<script src="Scripts/cookie.js"></script>
<script src="Scripts/font_sizing.js"></script>
<script src="Scripts/event_handling.js"></script>
<script src="Scripts/utilities.js"></script>

I would like to have the JavaScript files themselves include them as required. I just don't know a browser-agnostic method to do it. I need vanilla JavaScript only.

Thanks

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Searched Internet for How do I include JavaScript files in an other in a browser-agnostic manner

Posted 24-Jan-20 9:37am

gggustafson

Updated 24-Jan-20 10:22am

Sean Ewington

v2

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MadMyche · Answer 1 · 2020-01-24T10:23:00

Normally what you would do is to use one file for all of the pages javascripts to reduce the overhead of multiple HTTP calls, or have some other mechanism in place (e.g. #include page, ~bundles), or just do the 5 different script elements.

Doing some searching I found some code on Stack Overflow that may help

Dynamic Script Loading
You could add a script tag with the script URL into the HTML. To avoid the overhead of jQuery, this is an ideal solution.

The script can even reside on a different server. Furthermore, the browser evaluates the code. The {script} tag can be injected into either the web page {head}, or inserted just before the closing {body} tag.

From this I came up with this which is based on the provided code and added in your 5 sample files. You may need to work with getting the URLs to resolve properly, I myself would use fully qualified ones. And naturally you could put this in a completely separate file.

JavaScript

function LoadScript(url) {
     var script = document.createElement("script");
     script.src = url;
     document.head.appendChild(script);
}
LoadScript("Scripts/ajax.js");
LoadScript("Scripts/cookie.js");
LoadScript("Scripts/font_sizing.js");
LoadScript("Scripts/event_handling.js");
LoadScript("Scripts/utilities.js");

Source:
How do I include a JavaScript file in another JavaScript file? - Stack Overflow[^]