// JS used to search the js array created by update.asp
// Change History
//  12/09/05	SW	- Added code for dealing with international agents
//	05/05/05	SW	- Moved lookupPostcode() function into an include file to split code from design
//	20/04/05	SW	- Created page

// Global variable to hold request object
var req

// Function to perform a search on the postcode entered
function lookUpCoach( inCoach /*string*/) {
	var inStrLastChar = inCoach.length;
	var matchedAgents = new Array();
		if ( inStrLastChar > 0 ) {
			loadXMLDoc( "/coach/getCoach.php?station=" + inCoach );
		}
}

// Function to send the request
function loadXMLDoc( url ) {
	// Internet Explorer
	try { 
		req = new ActiveXObject( "Msxml2.XMLHTTP" );
	} catch( e ) {
		try { 
			req = new ActiveXObject("Microsoft.XMLHTTP");
		}	catch( oc ) {
			req = null;
		}
	}

	// Mozailla/Safari
	if ( !req && typeof XMLHttpRequest != "undefined" ) {
		req = new XMLHttpRequest();
	}

	// Call the processChange() function when the page has loaded
	if ( req != null ) {
		req.onreadystatechange = processChange;
		req.open( "GET", url, true );
		req.send( null );
	}
}

// Function to catch the reply to the request
function processChange() {
	// The page has loaded and the HTTP status code is 200 OK
	if ( req.readyState == 4 && req.status == 200 ) {
		// Check we have reults, otherwise do nothing
		if ( req.responseText != "NULL" ) {			
			// Split the data string that comes back so that we have an array
			var matchedAgents = req.responseText.split( "|" );
			// Write the array results into options tags in our select
			var outputSelect = getObject( "results" );
			
			// Loop round my results putting them into the results select on the form
			outputSelect.options.length = 0;
			
			for ( arrayIndex = 0; arrayIndex < matchedAgents.length; arrayIndex++ ) { 
				var agentData = matchedAgents[ arrayIndex ].split( ";" );
				var optionText = agentData[1];
				var optionValue = agentData[0];
				var newOption = new Option( optionText, optionValue );
				outputSelect.options[ arrayIndex ] = newOption;
			}
		}
	}
}

// Function to get HTML objects
function getObject( name ) {
	var ns4 = ( document.layers ) ? true : false;
	var w3c = ( document.getElementById ) ? true : false;
	var ie4 = ( document.all ) ? true : false;

	if ( ns4 ) return eval( 'document.' + name );
	if ( w3c ) return document.getElementById( name );
	if ( ie4 ) return eval( 'document.all.' + name );

	return false;
}