AutoSuggest = function ( fieldid, param ){
	this.fld = $(fieldid);

	if (!this.fld) return false;
		
	this.nInputChars = 0;
	this.aSuggestions = [];
	this.iHighlighted = 0;
	
	
	// parameters object
	this.oP = (param) ? param : {};
	// defaults	
	if (!this.oP.url)		this.oP.url = '/ajax/autoSuggest.php';
	if (!this.oP.minchars)		this.oP.minchars = 3;
	if (!this.oP.method)		this.oP.meth = "get";
	if (!this.oP.varname)		this.oP.varname = "input";
	if (!this.oP.className)		this.oP.className = "autosuggest";
	if (!this.oP.timeout)		this.oP.timeout = 2500;
	if (!this.oP.delay)			this.oP.delay = 500;
	if (!this.oP.maxheight && this.oP.maxheight !== 0)		this.oP.maxheight = 250;
	if (!this.oP.cache)			this.oP.cache = true;
	if (!this.oP.trim)			this.oP.trim = false;
	
	var pointer = this;
	
	this.fld.onkeyup = function () { pointer.getSuggestions( this.value ) };
	this.fld.setAttribute("autocomplete","off");
}



AutoSuggest.prototype.getSuggestions = function(val){

	if (val.length == this.nInputChars)
		return false;
	
	if (val.length < this.oP.minchars){
		this.nInputChars = val.length;
		this.aSuggestions = [];
		this.clearSuggestions();
		return false;
	}
	
	
	if (val.length>this.nInputChars && this.aSuggestions.length && this.oP.cache){
		// get from cache
		var arr = [];
		for (var i=0;i<this.aSuggestions.length;i++){
			if (this.aSuggestions[i].substr(0,val.length).toLowerCase() == val.toLowerCase())
				arr.push( this.aSuggestions[i] );
		}
		
		this.nInputChars = val.length;
		this.aSuggestions = arr;
		
		
		this.createList( this.aSuggestions );
		
		return false;
	}
	
	
	this.nInputChars = val.length;
	
	var pointer = this;
	clearTimeout(this.ajID);
	this.ajID = setTimeout( function() { pointer.doAjaxRequest() }, this.oP.delay );


	return false;
}





AutoSuggest.prototype.doAjaxRequest = function (){
	var pointer = this;
	
	// create ajax request
	var url = this.oP.url;
	var meth = this.oP.meth;
	
	/*var onSuccessFunc = function (req) { pointer.setSuggestions(req) };
	var onErrorFunc = function (status) { alert("AJAX error: "+status); };*/

	var myAjax = new ajaxConnection( this, url );
	myAjax.initRequestObject();
	myAjax.addVariable( this.oP.varname, this.fld.value );
	myAjax.execute();
}

AutoSuggest.prototype.processXMLResponse = function( node ){
	this.setSuggestions( node );
}

AutoSuggest.prototype.setSuggestions = function(xml){
	
	// traverse xml
	//
	this.aSuggestions = [];
	var results = xml.getElementsByTagName('results')[0].childNodes;

	for (var i=0;i<results.length;i++){
		if (results[i].hasChildNodes())
			this.aSuggestions.push( results[i].childNodes[0].nodeValue );
	}
	
	
	this.idAs = "as_"+this.fld.id;
	
	
	this.createList(this.aSuggestions);

}





AutoSuggest.prototype.createList = function(arr){
	// clear previous list
	//
	this.clearSuggestions();

	// create and populate ul
	//
	var ul = document.createElement( "ul" );
	ul.id = this.idAs;
	ul.className = this.oP.className;	
	
	var pointer = this;
	for (var i=0;i<arr.length;i++ ){
		var a = document.createElement( "a" );
		a.href = "";
		a.innerHTML = arr[i];
		a.onclick = function () { pointer.setValue( this.childNodes[0].nodeValue ); return false; }
		
		var li = document.createElement( "li" );
		li.appendChild( a );
		ul.appendChild(  li  );
	}
	
	var pos = this.getPos(this.fld);
	
	ul.style.left = pos.x + "px";
	ul.style.top = ( pos.y + this.fld.offsetHeight ) + "px";
	ul.style.width = this.fld.offsetWidth+"px";
	ul.onmouseover = function(){ pointer.killTimeout() }
	ul.onmouseout = function(){ pointer.resetTimeout() }


	document.getElementsByTagName("body")[0].appendChild(ul);
	
	if (ul.offsetHeight > this.oP.maxheight && this.oP.maxheight != 0){
		ul.style['height'] = this.oP.maxheight;
	}
	
	
	var TAB = 9;
	var ENTER = 13;
	var ESC = 27;
	var KEYUP = 38;
	var KEYDN = 40;
	var RETURN = 13;
	
	
	
	this.fld.onkeydown = function(ev){
		var key = (window.event) ? window.event.keyCode : ev.keyCode;

		switch(key){
			case TAB:
			pointer.setHighlightedValue();
			break;

			case ENTER:
			pointer.setHighlightedValue();
			return false;
			break;

			case ESC:
			pointer.clearSuggestions();
			break;

			case KEYUP:
			pointer.changeHighlight(key);
			return false;
			break;

			case KEYDN:
			pointer.changeHighlight(key);
			return false;
			break;
		}

	};

	this.iHighlighted = 0;
	
	
	// remove autosuggest after an interval
	//
	clearTimeout(this.toID);
	var pointer = this;
	this.toID = setTimeout(function () { pointer.clearSuggestions() }, this.oP.timeout);
}

AutoSuggest.prototype.changeHighlight = function(key){
	var list = $(this.idAs);
	if(!list) return false;
	
	
	if (this.iHighlighted > 0) list.childNodes[this.iHighlighted-1].className = "";
	
	if (key == 40)
		this.iHighlighted ++;
	else if (key = 38)
		this.iHighlighted --;
	
	
	if (this.iHighlighted > list.childNodes.length)
		this.iHighlighted = list.childNodes.length;
	if (this.iHighlighted < 1)
		this.iHighlighted = 1;
	
	list.childNodes[this.iHighlighted-1].className = "highlight";
	
	//alert( list.childNodes[this.iHighlighted-1].firstChild.firstChild.nodeValue );
	
	this.killTimeout();
}

AutoSuggest.prototype.killTimeout = function(){
	clearTimeout(this.toID);
}

AutoSuggest.prototype.resetTimeout = function(){
	clearTimeout(this.toID);
	var pointer = this;
	this.toID = setTimeout(function () { pointer.clearSuggestions() }, 1000);
}

AutoSuggest.prototype.clearSuggestions = function (){
	var obj = $(this.idAs)
	if ( obj ){
		obj.parentNode.removeChild(obj);
	}
	this.fld.onkeydown = null;
}

AutoSuggest.prototype.setHighlightedValue = function (){
	if (this.iHighlighted){
		if( this.oP.trim ){
			var len = this.fld.maxLength;
			this.fld.value = $(this.idAs).childNodes[this.iHighlighted-1].firstChild.firstChild.nodeValue.substr( 0, len );
		}else{
			this.fld.value = $(this.idAs).childNodes[this.iHighlighted-1].firstChild.firstChild.nodeValue;
		}
		//this.fld.value = $(this.idAs).childNodes[this.iHighlighted-1].firstChild.firstChild.nodeValue;
		this.killTimeout();
		this.clearSuggestions();
	}
}



AutoSuggest.prototype.setValue = function (val){
	if( this.oP.trim ){
		var len = this.fld.maxLength;
		this.fld.value = val.substr( 0, len );
	}else{
		this.fld.value = val;
	}
	//this.fld.value = val;
	this.killTimeout();
	this.clearSuggestions();
	//this.resetTimeout();
}

AutoSuggest.prototype.getPos = function( ele ){
	//var ele = $(ele);

	var obj = ele;

	var curleft = 0;
	if (obj.offsetParent){
		while (obj.offsetParent){
			curleft += obj.offsetLeft
			obj = obj.offsetParent;
		}
	}else if (obj.x){
		curleft += obj.x;
	}


	var obj = ele;
	var curtop = 0;
	if (obj.offsetParent){
		while (obj.offsetParent){
			curtop += obj.offsetTop
			obj = obj.offsetParent;
		}
	}else if (obj.y){
		curtop += obj.y;
	}

	return {x:curleft, y:curtop}
}