Question

www.mywebsite.com/?foo=bar

How can I get the value of foo into a Javascript variable?

Answer 1

You don’t even need PHP for that. Basically, you can parse window.location.href to get the value of a GET URL parameter into a JavaScript variable.

There is plenty of code online, you can use for example this:

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

To get the value of foo, just call getUrlParameter("foo") in your JavaScript code.