How to read query string value with JavaScript?
 To read query string value from the current url with javascript you need to add a function in your head or body section.   function  getQueryStringValue ( key )  {      return  decodeURIComponent ( window . location . search . replace ( new  RegExp ( "^(?:.*[&\\?]"  +  encodeURIComponent ( key ). replace ( /[\.\+\*]/ g ,  "\\$&" )  +  "(?:\\=([^&]*))?)?.*$" ,  "i" ),  "$1" ));    }   Then you can alert or console the value of your query string.  Like you have this url in your query string  www.example.com/word/?key=value   now you can get the value of key string like this.  console . log ( getQueryStringValue ( "key" ));  or you can alert this  alert( getQueryStringValue ( "key" ) );