/**
 * Provides suggestions for placenames (USA).
 * @class
 * @scope public
 */
function PlacenameSuggestions() {
	if (typeof XMLHttpRequest != "undefined") {
		this.http = new XMLHttpRequest();
	} else if (typeof ActiveXObject != "undefined") {
		this.http = new ActiveXObject("MSXML2.XmlHttp");
	} else {
		alert("No XMLHttpRequest object available. This functionality will not work.");
	}
}

/**
 * Request suggestions for the given autosuggest control. 
 * @scope protected
 * @param oAutoSuggestControl The autosuggest control to provide suggestions for.
 */
PlacenameSuggestions.prototype.requestSuggestions = function (oAutoSuggestControl /*:AutoSuggestControl*/, bTypeAhead /*:boolean*/) {

	var oHttp = this.http;
															 
	//if there is already a live request, cancel it
	if (oHttp.readyState != 0) {
		oHttp.abort();
	}				 
	
	//build the URL
	var sURL = "/includes/job-listing.ajax.php?input=" + encodeURIComponent(oAutoSuggestControl.textbox.value.capitalize());
	
	oHttp.open("get", sURL , true);
	oHttp.onreadystatechange = function () {
		if (oHttp.readyState == 4) {

			if (oHttp.responseText.length > 0) {
				//evaluate the returned text JavaScript (an array)
				var aSuggestions = eval(oHttp.responseText);

				//provide suggestions to the control
				oAutoSuggestControl.autosuggest(aSuggestions, bTypeAhead);		
			}
		}	
	};
	oHttp.send(null);
};