use javascript to find parameter in url and then apply if then logic

Question

I am trying to make my page perform an action only if it sees that a particular parameter is present in the url.

I essentially want the javascript code to do this:

consider an example page such as: http://www.example.com?track=yes

If a page loads that contains the parameter 'track' within the url, print 'track exists', else if the 'track' parameter doesn't exist print 'track does not exist'

Answer 1

This should work:

if (window.location.search.indexOf('track=yes') > -1) {     alert('track present'); } else {     alert('track not here'); }