/* author:		Timothy Groves - http://www.brandspankingnew.net
 * version:		1.2 - 2006-11-17
 *              1.3 - 2006-12-04
 *              2.0 - 2007-02-07 */
var useBSNns;
if (useBSNns){
	if (typeof(bsn) == "undefined")
		bsn = {};
	_bsn = bsn;
}
else{
	_bsn = this;
}

if (typeof(_bsn.Autosuggest) == "undefined")
	_bsn.Autosuggest = {};

_bsn.AutoSuggest = function (id, param){
	// no DOM - give up!
	if (!document.getElementById)
		return false;
	
	// get field via DOM
	this.fld = _bsn.DOM.gE(id);	
	if (!this.fld)
		return false;
	
	// init variables
	this.sInput 		= "";
	this.nInputChars 	= 0;
	this.aSuggestions 	= [];
	this.iHighlighted 	= 1;
	
	// parameters object
	this.oP = (param) ? param : {};
	
	// defaults	
	var def = {minchars:1, meth:"get", varname:"palabra", className:"autosuggest", timeout:25000, delay:500, offsety:-5, shownoresults: true, noresults: "No se encontraron sugerencias", maxheight: 250, cache: false};
	for (k in def)
		if (typeof(this.oP[k]) != typeof(def[k]))	this.oP[k] = def[k];
	
	// set keyup handler for field
	// and prevent autocomplete from client
	var p = this;
	
	// NOTE: not using addEventListener because UpArrow fired twice in Safari
	//_bsn.DOM.addEvent( this.fld, 'keyup', function(ev){ return pointer.onKeyPress(ev); } );
	
	this.fld.onkeypress 	= function(ev){ return p.onKeyPress(ev); }
	this.fld.onkeyup 		= function(ev){ return p.onKeyUp(ev); }
	
	this.fld.setAttribute("autocomplete","off");
}

_bsn.AutoSuggest.prototype.onKeyPress = function(ev){	
	var key = (window.event) ? window.event.keyCode : ev.keyCode;
	// set responses to keydown events in the field
	// this allows the user to use the arrow keys to scroll through the results
	// ESCAPE clears the list
	// TAB sets the current highlighted value
	var RETURN = 13;
	var TAB = 9;
	var ESC = 27;	
	var bubble = true;	
	switch(key){
		case RETURN:			
			this.setHighlightedValue();
			bubble = false;
			break;
		case ESC:
			this.clearSuggestions();
			break;
	}
	return bubble;
}

_bsn.AutoSuggest.prototype.onKeyUp = function(ev){
	var key = (window.event) ? window.event.keyCode : ev.keyCode;
	// set responses to keydown events in the field
	// this allows the user to use the arrow keys to scroll through the results
	// ESCAPE clears the list
	// TAB sets the current highlighted value	
	var ARRUP = 38;
	var ARRDN = 40;	
	var ATRAS = 8;
	var bubble = true;
	switch(key){
		case ARRUP:
			this.changeHighlight(key);
			bubble = false;
			break;
		case ARRDN:
			this.changeHighlight(key);
			bubble = false;
			break;
		default:
			this.getSuggestions(this.fld.value);
	}
	return bubble;
}

_bsn.AutoSuggest.prototype.getSuggestions = function (val){
	// if input stays the same, do nothing
	if (val == this.sInput)
		return false;
	// input length is less than the min required to trigger a request
	// reset input string
	// do nothing
	if (val.length < this.oP.minchars){
		this.sInput = "";
		this.clearSuggestions();
		return false;
	}	
	
	// if caching enabled, and user is typing (ie. length of input is increasing)
	// filter results out of aSuggestions from last request
	//
	if (val.length>this.nInputChars && this.aSuggestions.length && this.oP.cache){
		var arr = [];
		for (var i=0;i<this.aSuggestions.length;i++){
			if (this.aSuggestions[i].value.substr(0,val.length).toLowerCase() == val.toLowerCase())
				arr.push( this.aSuggestions[i] );
		}		
		this.sInput = val;
		this.nInputChars = val.length;
		this.aSuggestions = arr;		
		this.createList(this.aSuggestions);		
		return false;
	}// do new request
	else{
		this.sInput = val;
		this.nInputChars = val.length;
		var pointer = this;
		clearTimeout(this.ajID);
		this.ajID = setTimeout( function() { pointer.doAjaxRequest() }, this.oP.delay );
	}
	return false;
}

_bsn.AutoSuggest.prototype.doAjaxRequest = function (){	
	var pointer = this;	
	// create ajax request
	if (typeof(this.oP.script) == "function")
		var url = this.oP.script(escape(this.fld.value));
	else
		var url = this.oP.script+this.oP.varname+"="+escape(this.fld.value);
	
	if (!url)
		return false;
	
	var meth = this.oP.meth;
	var onSuccessFunc = function (req) { pointer.setSuggestions(req) };
	var onErrorFunc = function (status) { alert("AJAX error: "+status); };
	var myAjax = new _bsn.Ajax();
	myAjax.makeRequest( url, meth, onSuccessFunc, onErrorFunc );
}

_bsn.AutoSuggest.prototype.setSuggestions = function (req){
	this.aSuggestions = [];	
	if (this.oP.json){		
		var jsondata = eval('(' + req.responseText + ')');		
		for (var i=0;i<jsondata.results.length;i++){
			// Version Completa
			// this.aSuggestions.push(  { 'id':jsondata.results[i].id, 'value':jsondata.results[i].value, 'info':jsondata.results[i].info }  );			
			this.aSuggestions.push(  { 'value':jsondata.results[i].value }  );
		}
	}
	else{
		var xml = req.responseXML;	
		// traverse xml
		var results = xml.getElementsByTagName('results')[0].childNodes;
		for (var i=0;i<results.length;i++){
			if (results[i].hasChildNodes())
				this.aSuggestions.push(  { 'id':results[i].getAttribute('id'), 'value':results[i].childNodes[0].nodeValue, 'info':results[i].getAttribute('info') }  );
		}	
	}	
	this.idAs = "as_"+this.fld.id;
	this.createList(this.aSuggestions);
}

_bsn.AutoSuggest.prototype.createList = function(arr){
	if(this.sInput!=""){
		var pointer = this;
		// get rid of old list
		// and clear the list removal timeout
		_bsn.DOM.remE(this.idAs);
		this.killTimeout();
		// if no results, and shownoresults is false, do nothing
		if (arr.length == 0 && !this.oP.shownoresults)
			return false;
		
		// create holding div
		var div = _bsn.DOM.cE("div", {id:this.idAs, className:this.oP.className});	
		
		var ul = _bsn.DOM.cE("ul", {id:"as_ul"});
		
		// loop throught arr of suggestions
		// creating an LI element for each suggestion	
		for (var i=0;i<arr.length;i++){
			// format output with the input enclosed in a EM element
			// (as HTML, not DOM)
			var val = arr[i].value;
			var st = val.toLowerCase().indexOf( this.sInput.toLowerCase() );
			var output = val.substring(0,st) + "<em>" + val.substring(st, st+this.sInput.length) + "</em>" + val.substring(st+this.sInput.length);
			
			var span = _bsn.DOM.cE("span", {}, output, true);			
			var a = _bsn.DOM.cE("a", { href:"#" });		
			var tl = _bsn.DOM.cE("span", {className:"tl"}, " ");
			var tr = _bsn.DOM.cE("span", {className:"tr"}, " ");
			a.appendChild(tl);
			a.appendChild(tr);		
			a.appendChild(span);
			
			a.name = i+1;
			a.onclick = function () { pointer.setHighlightedValue(); return false; }
			a.onmouseover = function () { pointer.setHighlight(this.name); }		
			var li 			= _bsn.DOM.cE(  "li", {}, a  );		
			ul.appendChild( li );
		}	
		
		// no results
		if (arr.length == 0 && this.oP.shownoresults){
			var li 			= _bsn.DOM.cE(  "li", {className:"as_warning"}, this.oP.noresults  );
			ul.appendChild( li );
		}	
		div.appendChild( ul );	
		// get position of target textfield
		// position holding div below it
		// set width of holding div to width of field
		var pos = _bsn.DOM.getPos(this.fld);	
		div.style.left 		= pos.x + "px";
		div.style.top 		= ( pos.y + this.fld.offsetHeight + this.oP.offsety ) + "px";
		div.style.width 	= this.fld.offsetWidth + "px";
		
		// set mouseover functions for div
		// when mouse pointer leaves div, set a timeout to remove the list after an interval
		// when mouse enters div, kill the timeout so the list won't be removed
		div.onmouseover 	= function(){ pointer.killTimeout() }
		div.onmouseout 		= function(){ pointer.resetTimeout() }
		// add DIV to document
		document.getElementsByTagName("body")[0].appendChild(div);
		// currently no item is highlighted
		this.iHighlighted = 0;
		// remove list after an interval
		var pointer = this;
		this.toID = setTimeout(function () { pointer.clearSuggestions() }, this.oP.timeout);
	}
	//return false;
}

_bsn.AutoSuggest.prototype.changeHighlight = function(key){	
	var list = _bsn.DOM.gE("as_ul");
	if (!list)
		return false;
	
	var n;
	if (key == 40)
		n = this.iHighlighted + 1;
	else if (key == 38)
		n = this.iHighlighted - 1;
	
	if (n > list.childNodes.length)
		n = list.childNodes.length;
	if (n < 1)
		n = 1;
	
	this.setHighlight(n);
}

_bsn.AutoSuggest.prototype.setHighlight = function(n){
	var list = _bsn.DOM.gE("as_ul");
	if (!list)
		return false;
	
	if (this.iHighlighted > 0)
		this.clearHighlight();
	
	this.iHighlighted = Number(n);
	list.childNodes[this.iHighlighted-1].className = "as_highlight";
	this.killTimeout();
}

_bsn.AutoSuggest.prototype.clearHighlight = function(){
	var list = _bsn.DOM.gE("as_ul");
	if (!list)
		return false;
	
	if (this.iHighlighted > 0){
		list.childNodes[this.iHighlighted-1].className = "";
		this.iHighlighted = 0;
	}
}


_bsn.AutoSuggest.prototype.setHighlightedValue = function (){
	if (this.iHighlighted){
		this.sInput = this.fld.value = this.aSuggestions[ this.iHighlighted-1 ].value;
		
		// move cursor to end of input (safari)
		this.fld.focus();
		if (this.fld.selectionStart)
			this.fld.setSelectionRange(this.sInput.length, this.sInput.length);
		
		this.clearSuggestions();
		
		// pass selected object to callback function, if exists
		if (typeof(this.oP.callback) == "function")
			this.oP.callback( this.aSuggestions[this.iHighlighted-1] );
	}
}

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

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

_bsn.AutoSuggest.prototype.clearSuggestions = function (){	
	this.killTimeout();	
	var ele = _bsn.DOM.gE(this.idAs);
	var pointer = this;
	if (ele){
		var fade = new _bsn.Fader(ele,1,0,250,function () { _bsn.DOM.remE(pointer.idAs) });
	}
}

// AJAX PROTOTYPE _____________________________________________
if (typeof(_bsn.Ajax) == "undefined")
	_bsn.Ajax = {}

_bsn.Ajax = function (){
	this.req = {};
	this.isIE = false;
}

_bsn.Ajax.prototype.makeRequest = function (url, meth, onComp, onErr){
	
	if (meth != "POST")
		meth = "GET";
	
	this.onComplete = onComp;
	this.onError = onErr;
	var pointer = this;
	// branch for native XMLHttpRequest object
	if (window.XMLHttpRequest){
		this.req = new XMLHttpRequest();
		this.req.onreadystatechange = function () { pointer.processReqChange() };
		this.req.open("GET", url, true); //
		this.req.send(null);
	// branch for IE/Windows ActiveX version
	}
	else if (window.ActiveXObject){
		this.req = new ActiveXObject("Microsoft.XMLHTTP");
		if (this.req){
			this.req.onreadystatechange = function () { pointer.processReqChange() };
			this.req.open(meth, url, true);
			this.req.send();
		}
	}
}

_bsn.Ajax.prototype.processReqChange = function(){
	// only if req shows "loaded"
	if (this.req.readyState == 4) {
		// only if "OK"
		if (this.req.status == 200){
			this.onComplete( this.req );
		} else {
			this.onError( this.req.status );
		}
	}
}

// DOM PROTOTYPE _____________________________________________
if (typeof(_bsn.DOM) == "undefined")
	_bsn.DOM = {}
/* create element */
_bsn.DOM.cE = function ( type, attr, cont, html ){
	var ne = document.createElement( type );
	if (!ne)
		return false;
		
	for (var a in attr)
		ne[a] = attr[a];
		
	if (typeof(cont) == "string" && !html)
		ne.appendChild( document.createTextNode(cont) );
	else if (typeof(cont) == "string" && html)
		ne.innerHTML = cont;
	else if (typeof(cont) == "object")
		ne.appendChild( cont );
	return ne;
}

/* get element */
_bsn.DOM.gE = function ( e ){
	if (typeof(e) == "undefined")
		return false;
	else if (typeof(e) == "string"){
		var re = document.getElementById( e );
		if (!re)
			return false;
		else if (typeof(re.appendChild) != "undefined" ) {
			return re;
		} else {
			return false;
		}
	}
	else if (typeof(e.appendChild) != "undefined")
		return e;
	else
		return false;
}

/* remove element */
_bsn.DOM.remE = function ( ele ){
	var e = this.gE(ele);	
	if (!e)
		return false;
	else if (e.parentNode.removeChild(e))
		return true;
	else
		return false;
}

/* get position */
_bsn.DOM.getPos = function ( e ){
	var e = this.gE(e);
	var obj = e;
	var curleft = 0;
	if (obj.offsetParent){
		while (obj.offsetParent){
			curleft += obj.offsetLeft;
			obj = obj.offsetParent;
		}
	}
	else if (obj.x)
		curleft += obj.x;
	
	var obj = e;	
	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};
}

// FADER PROTOTYPE _____________________________________________
if (typeof(_bsn.Fader) == "undefined")
	_bsn.Fader = {}

_bsn.Fader = function (ele, from, to, fadetime, callback){	
	if (!ele)
		return false;
	
	this.ele = ele;	
	this.from = from;
	this.to = to;	
	this.callback = callback;	
	this.nDur = fadetime;		
	this.nInt = 50;
	this.nTime = 0;	
	var p = this;
	this.nID = setInterval(function() { p._fade() }, this.nInt);
}

_bsn.Fader.prototype._fade = function(){
	this.nTime += this.nInt;	
	var ieop = Math.round( this._tween(this.nTime, this.from, this.to, this.nDur) * 100 );
	var op = ieop / 100;
	
	// internet explorer
	if (this.ele.filters){
		try{
			this.ele.filters.item("DXImageTransform.Microsoft.Alpha").opacity = ieop;
		} catch (e) { 
			// If it is not set initially, the browser will throw an error.  This will set it if it is not set yet.
			this.ele.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity='+ieop+')';
		}
	}// other browsers
	else{
		this.ele.style.opacity = op;
	}	
	
	if (this.nTime == this.nDur){
		clearInterval( this.nID );
		if (this.callback != undefined)
			this.callback();
	}
}

_bsn.Fader.prototype._tween = function(t,b,c,d){	
	return b + ( (c-b) * (t/d) );
}