How to get the querystring of a page with JavaScript?

Question

I wanna to get the query string of a page within a JavaScript block. for example:

The page has a URL like localhost:1234/Test/page1.aspx?ID=10

How can I get '10' with JavaScript?

Jacob Relkin · Accepted Answer · 2010-01-31 11:49:37Z

3

window.location.search is the way to go.

Here's an example function:

function getQSVar( varname ) { 
   var query = window.location.search.substring( 1 ); 
   var vars = query.split( "&" );
   var len = vars.length; 
   for ( var i = 0; i < len; i++ ) { 
      var pair = vars[ i ].split( "=" ); 
      if ( pair[ 0 ] == varname ) { 
         return pair[ 1 ]; 
      } 
   } 
   return null;
}

Usage:

var IDValue = getQSVar( 'ID' ); // 10

edited Jan 31, 2010 at 11:49

answered Jan 31, 2010 at 11:29

Jacob Relkin

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2 Comments

Anonymous Over a year ago

You might want to split on /[&;]/ instead.

clerktech Over a year ago

@Jacob Relkin How do I pass it to a textbox on an aspx page?

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