Question

I’m looking for a way to post variables in an external .js file.

Something like:

<script type="text/javascript" src="/js/script-starter.js?var=value"></script>

And then I’d like to call var (and thus, value). Is this possible in any way?

Thank you!

Answer 1

Yes, it is possible. You will have to look for all script tags in the DOM (make sure the DOM is loaded before attempting to look in it) using the document.getElementsByTagName function, loop through the resulting list, find the corresponding script and parse the src property in order to extract the value you are looking for.

Something along the lines of:

var scripts = ​document.getElementsByTagName('script');
​for (var i = 0; i < scripts.length; i++)​ {
    var src = scripts[i].src;
    // Now that you know the src you could test whether this is the script
    // that you are looking for (i.e. does it contain the script-starter.js string)
    // and if it does parse it.
}​

As far as the parsing of the src attribute is concerned and extracting the query string values from it you may use the following function.