How do I get query string value from script path?

Question

I am adding my Javsacript file in pages with different query strings in the script path like this:

Page1:

<script type="text/javascript" src="file.js?abc=123"></script> 

Page2:

<script type="text/javascript" src="file.js?abc=456"></script> 

Page3:

<script type="text/javascript" src="file.js?abc=789"></script> 

In my Javascript file, how can I get the value of the "abc" param? I tried using window.location for this, but that does not work.

In case it helps, below is a function I use to find the value of a query string param:

function getQuerystring(key, defaultValue) {     if (defaultValue == null) defaultValue = "";     key = key.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");     var regex = new RegExp("[\\?&]" + key + "=([^&#]*)");     var qs = regex.exec(window.location.href);     if (qs == null)         return defaultValue;     else         return qs[1]; } 

Answer 1

This is possible. See Passing JavaScript arguments via the src attribute. The punchline is that since scripts in HTML (not XHTML) are executed as loaded, this will allow a script to find itself as it is always the last script in the page when it’s triggered–

var scripts = document.getElementsByTagName('script'); var index = scripts.length - 1; var myScript = scripts[index]; // myScript now contains our script object var queryString = myScript.src.replace(/^[^\?]+\??/,''); 

Then you just apply the query string parsing.