Mike T. Henderson

A while back I created a little ActionScript 3 class, using the ExternalInterface.call method, that returns a query string value from the url. This came in pretty handy for things such as direct linking to certain videos within a video player, displaying campaign specific content on load based on different referring sites, ect, etc.

Upon second glance, I realized that I got a little loop-happy with the previous attempt. Below is a slimmer version with the redundancies taken out.

 
package com {
 
	import flash.external.ExternalInterface;
 
	public class QueryString {
 
		private static var _match:Boolean;
		private static var _value:String;
 
		public function QueryString() {
			// constructor
		}
 
		public static function getQueryValue ( qvar:String ):String {// reset vars
			_match = false;
			_value = "";
 
			// get full query string
			var _query:String = ExternalInterface.call("document.location.search.toString");
 
			// remove question mark
			_query = _query.substring( 1, _query.length );
 
			var qarray = _query.split( "&" );
 
			for ( var i = 0; i < qarray.length; i ++ ) {
 
				if ( qarray[ i ].split( "=" )[ 0 ] == qvar ) {
					_value = qarray[ i ].split( "=" )[ 1 ];
					break;
				}
 
			}
 
			return _value;
		}
 
	}
 
}
 

Public Static Methods:
getQueryValue( qvar:String ):String -- returns value of var name from query string in url

Properties of getQueryValue():
qvar:String -- name of variable you wish to retrieve value from

Usage Example:

 
import com.QueryString;
// create text field
var myQValue:TextField = new TextField();
// add to display list
addChild( myQValue );
// if query string = ?name=mike&age=27
myQValue.text = QueryString.getQueryValue("name"); // returns mike
 

1 Comment | Posted under Strings