Incremental Search v1.3

/**************************************
* Jonas Raoni Soares Silva
* http://www.joninhas.ath.cx
**************************************/
 
//=============================================================
// REQUIRES http://www.jsfromhell.com/geral/event-listener v1.3
//=============================================================
 
IncrementalSearch = function(input, callback, className){ //v1.3
    var i, $ = this;
    ($.input = input).autocomplete = "off", $.callback = callback || function(){},
    $.className = className || "", $.hide(), $.visible = 0;
    for(i in {keydown: 0, focus: 0, blur: 0, keyup: 0, keypress: 0})
        addEvent(input, i, $._handler, $);
};
with({p: IncrementalSearch.prototype}){
    p.show = function(){
        for(var $ = this, s = $.c.style, o = $.input, x = o.offsetLeft,
            y = o.offsetTop + o.offsetHeight; o = o.offsetParent; x += o.offsetLeft, y += o.offsetTop);
        s.left = x + "px", s.top = y + "px",
        $.l.length ? (s.display = "block", !$.visible && ($._callEvent("onshow"), ++$.visible), $.highlite(0)) : s.display = "none";
    };
    p.hide = function(){
        var $ = this, d = document, s = ($.c && $.c.parentNode.removeChild($.c),
        $.c = d.body.appendChild(d.createElement("div"))).style;
        $.l = [], $.i = -1, $.c.className = $.className, s.position = "absolute", s.display = "none";
        $._old = null, $.visible && ($._callEvent("onhide"), --$.visible);
    };
    p.add = function(s, x, data){
        var $ = this, l = 0, d = document, i = $.l.length, v = $.input.value.length,
            o = ($.l[i] = [s, data, $.c.appendChild(d.createElement("div"))])[2];
        if(x instanceof Array || (x = [x]), o.i = i, o.className = "normal", !isNaN(x[0]))
            for(var j = -1, k = x.length; ++j < k; o.appendChild(d.createTextNode(
                s.substring(l, x[j]))).parentNode.appendChild(d.createElement(
                "span")).appendChild(d.createTextNode(s.substring(x[j],
                l = x[j] + v))).parentNode.className = "highlited");
        for(x in o.appendChild(d.createTextNode(s.substr(l))), {click: 0, mouseover: 0})
            addEvent(o, x, $._handler, $);
    };
    p.highlite = function(i){
        var $ = this;
        $._invalid(i) || ($._invalid($.i) || ($.l[$.i][2].className = "normal"),
        $.l[$.i = i][2].className += " selected", $._callEvent("onhighlite", $.l[i][0], $.l[i][1]));
    };
    p.select = function(i){
        var $ = this;
        $._invalid(i = isNaN(i) ? $.i : i) || ($._callEvent("onselect",
            $.input.value = $.l[$.i][0], $.l[i][1]), $.hide());
    };
    p.next = function(){
        var $ = ($ = this, $.highlite(($.i + 1) % $.l.length));
    };
    p.previous = function(){
        var $ = ($ = this, $.highlite((!$.i ? $.l.length : $.i) - 1));
    };
    p._fadeOut = function(){
        var f = (f = function(){arguments.callee.x.hide();}, f.x = this, setTimeout(f, 200));
    };
    p._handler = function(e){
        var $ = this, t = e.type, k = e.key;
        t == "focus" || t == "keyup" ? k != 40 && k != 38 && k != 13 && $._old != $.input.value && ($.hide(), $.callback($, $.input.value))
        : t == "keydown" ? k == 40 ? $.next() : k == 38 ? $.previous() : $._old = $.input.value
        : t == "keypress" ? k == 13 && (e.preventDefault(), $.select())
        : t == "blur" ? $._fadeOut() : t == "click" ? $.select()
        : $.highlite((/span/i.test((e = e.target).tagName) ? e.parentNode : e).i);
    };
    p._invalid = function(i){
        return isNaN(i) || i < 0 || i >= this.l.length;
    }
    p._callEvent = function(e){
        var $ = this;
        return $[e] instanceof Function ? $[e].apply($, [].slice.call(arguments, 1)) : undefined;
    };
}