AutoSuggester Js for without jquery

if (typeof(bsn) == "undefined")
_b = bsn = {};


if (typeof(_b.Autosuggest) == "undefined")
_b.Autosuggest = {};
else
consol.log("Autosuggest is already set!");

_b.AutoSuggest = function (id, param)
{
// no DOM - give up!
//
if (!document.getElementById)
return 0;


// get field via DOM
//
this.fld = _b.DOM.gE(id);

if (!this.fld)
return 0;




// init variables
//
this.sInp = "";
this.nInpC = 0;
this.aSug = [];
this.iHigh = 0;



// parameters object
//
this.oP = param ? param : {};

// defaults
//
var k, def = {minchars:1, meth:"get", varname:"input", className:"autosuggest", timeout:2500, delay:500, offsety:-5, shownoresults: true, noresults: "No results!", maxheight: 250, cache: true, maxentries: 25};
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
//_b.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");
};

_b.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 = 1;

switch(key)
{
case RETURN:
this.setHighlightedValue();
bubble = 0;
break;

case ESC:
this.clearSuggestions();
break;
}

return bubble;
};



_b.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 bubble = 1;

switch(key)
{


case ARRUP:
this.changeHighlight(key);
bubble = 0;
break;


case ARRDN:
this.changeHighlight(key);
bubble = 0;
break;


default:
this.getSuggestions(this.fld.value);
}

return bubble;


};


_b.AutoSuggest.prototype.getSuggestions = function (val)
{

// if input stays the same, do nothing
//
if (val == this.sInp)
return 0;


// kill list
//
_b.DOM.remE(this.idAs);


this.sInp = val;


// input length is less than the min required to trigger a request
// do nothing
//
if (val.length < this.oP.minchars)
{
this.aSug = [];
this.nInpC = val.length;
return 0;
}




var ol = this.nInpC; // old length
this.nInpC = val.length ? val.length : 0;



// if caching enabled, and user is typing (ie. length of input is increasing)
// filter results out of aSuggestions from last request
//
var l = this.aSug.length;
if (this.nInpC > ol && l && l<this.oP.maxentries && this.oP.cache)
{
var arr = [];
for (var i=0;i<l;i++)
{
if (this.aSug[i].value.substr(0,val.length).toLowerCase() == val.toLowerCase())
arr.push( this.aSug[i] );
}
this.aSug = arr;

this.createList(this.aSug);



return false;
}
else
// do new request
//
{
var pointer = this;
var input = this.sInp;
clearTimeout(this.ajID);
this.ajID = setTimeout( function() { pointer.doAjaxRequest(input) }, this.oP.delay );
}

return false;
};


_b.AutoSuggest.prototype.doAjaxRequest = function (input)
{
// check that saved input is still the value of the field
//
if (input != this.fld.value)
return false;


var pointer = this;


// create ajax request
//
if (typeof(this.oP.script) == "function")
var url = this.oP.script(encodeURIComponent(this.sInp));
else
var url = this.oP.script+this.oP.varname+"="+encodeURIComponent(this.sInp);

if (!url)
return false;

var meth = this.oP.meth;
var input = this.sInp;

var onSuccessFunc = function (req) { pointer.setSuggestions(req, input) };
var onErrorFunc = function (status) { consol.log("AJAX error: "+status); };

var myAjax = new _b.Ajax();
myAjax.makeRequest( url, meth, onSuccessFunc, onErrorFunc );
};

_b.AutoSuggest.prototype.setSuggestions = function (req, input)
{
// if field input no longer matches what was passed to the request
// don't show the suggestions
//
if (input != this.fld.value)
return false;


this.aSug = [];


if (this.oP.json)
{
var jsondata = eval('(' + req.responseText + ')');

for (var i=0;i<jsondata.results.length;i++)
{
this.aSug.push(  { 'id':jsondata.results[i].id, 'value':jsondata.results[i].value, 'info':jsondata.results[i].info, 'url':jsondata.results[i].url }  );
}
}
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.aSug.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.aSug);

};


_b.AutoSuggest.prototype.createList = function(arr)
{
var pointer = this;




// get rid of old list
// and clear the list removal timeout
//
_b.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 = _b.DOM.cE("div", {id:this.idAs, className:this.oP.className});

var hcorner = _b.DOM.cE("div", {className:"as_corner"});
var hbar = _b.DOM.cE("div", {className:"as_bar"});
var header = _b.DOM.cE("div", {className:"as_header"});
header.appendChild(hcorner);
header.appendChild(hbar);
div.appendChild(header);




// create and populate ul
//
var ul = _b.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.sInp.toLowerCase() );
var output = val.substring(0,st) + "<em>" + val.substring(st, st+this.sInp.length) + "</em>" + val.substring(st+this.sInp.length);


var span = _b.DOM.cE("span", {}, output, true);
if (arr[i].info != "")
{
var br = _b.DOM.cE("br", {});
span.appendChild(br);
var small = _b.DOM.cE("small", {}, arr[i].info);
span.appendChild(small);
}

var a = _b.DOM.cE("a", { href:"javascript:void();" });

var tl = _b.DOM.cE("span", {className:"tl"}, " ");
var tr = _b.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 = _b.DOM.cE(  "li", {}, a  );

ul.appendChild( li );
}


// no results
//
if (arr.length == 0 && this.oP.shownoresults)
{
var li = _b.DOM.cE(  "li", {className:"as_warning"}, this.oP.noresults  );
ul.appendChild( li );
}


div.appendChild( ul );


var fcorner = _b.DOM.cE("div", {className:"as_corner"});
var fbar = _b.DOM.cE("div", {className:"as_bar"});
var footer = _b.DOM.cE("div", {className:"as_footer"});
footer.appendChild(fcorner);
footer.appendChild(fbar);
div.appendChild(footer);



// get position of target textfield
// position holding div below it
// set width of holding div to width of field
//
var pos = _b.DOM.getPos(this.fld);

div.style.left = pos.x + "px";
div.style.top = ( pos.y + this.fld.offsetHeight + this.oP.offsety ) + 5 + "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.iHigh = 0;


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


_b.AutoSuggest.prototype.changeHighlight = function(key)
{
var list = _b.DOM.gE("as_ul");
if (!list)
return false;

var n;

if (key == 40)
n = this.iHigh + 1;
else if (key == 38)
n = this.iHigh - 1;


if (n > list.childNodes.length)
n = list.childNodes.length;
if (n < 1)
n = 1;


this.setHighlight(n);
};



_b.AutoSuggest.prototype.setHighlight = function(n)
{
var list = _b.DOM.gE("as_ul");
if (!list)
return false;

if (this.iHigh > 0)
this.clearHighlight();

this.iHigh = Number(n);

list.childNodes[this.iHigh-1].className = "as_highlight";


this.killTimeout();
};


_b.AutoSuggest.prototype.clearHighlight = function()
{
var list = _b.DOM.gE("as_ul");
if (!list)
return false;

if (this.iHigh > 0)
{
list.childNodes[this.iHigh-1].className = "";
this.iHigh = 0;
}
};


_b.AutoSuggest.prototype.setHighlightedValue = function ()
{
if (this.iHigh)
{
var lastSearchTerm = this.fld.value;
this.sInp = this.fld.value = this.aSug[ this.iHigh-1 ].value;

// move cursor to end of input (safari)
//
this.fld.focus();
if (this.fld.selectionStart)
this.fld.setSelectionRange(this.sInp.length, this.sInp.length);


this.clearSuggestions();

// pass selected object to callback function, if exists
//
if (typeof(this.oP.callback) == "function")
this.oP.callback( this.aSug[this.iHigh-1],  lastSearchTerm);
}
};


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

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







_b.AutoSuggest.prototype.clearSuggestions = function ()
{

this.killTimeout();

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

// AJAX PROTOTYPE _____________________________________________


if (typeof(_b.Ajax) == "undefined")
_b.Ajax = {};



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



_b.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();
}
}
};


_b.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(_b.DOM) == "undefined")
_b.DOM = {};



/* create element */
_b.DOM.cE = function ( type, attr, cont, html )
{
var ne = document.createElement( type );
if (!ne)
return 0;

for (var a in attr)
ne[a] = attr[a];

var t = typeof(cont);

if (t == "string" && !html)
ne.appendChild( document.createTextNode(cont) );
else if (t == "string" && html)
ne.innerHTML = cont;
else if (t == "object")
ne.appendChild( cont );

return ne;
};



/* get element */
_b.DOM.gE = function ( e )
{
var t=typeof(e);
if (t == "undefined")
return 0;
else if (t == "string")
{
var re = document.getElementById( e );
if (!re)
return 0;
else if (typeof(re.appendChild) != "undefined" )
return re;
else
return 0;
}
else if (typeof(e.appendChild) != "undefined")
return e;
else
return 0;
};



/* remove element */
_b.DOM.remE = function ( ele )
{
var e = this.gE(ele);

if (!e)
return 0;
else if (e.parentNode.removeChild(e))
return true;
else
return 0;
};



/* get position */
_b.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(_b.Fader) == "undefined")
_b.Fader = {};





_b.Fader = function (ele, from, to, fadetime, callback)
{
if (!ele)
return 0;

this.e = ele;

this.from = from;
this.to = to;

this.cb = callback;

this.nDur = fadetime;

this.nInt = 50;
this.nTime = 0;

var p = this;
this.nID = setInterval(function() { p._fade() }, this.nInt);
};




_b.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;

if (this.e.filters) // internet explorer
{
try
{
this.e.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.e.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity='+ieop+')';
}
}
else // other browsers
{
this.e.style.opacity = op;
}


if (this.nTime == this.nDur)
{
clearInterval( this.nID );
if (this.cb != undefined)
this.cb();
}
};



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