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Gmail-Like Incremental Search //JavaScript Class

09.09.2005
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        <a href="http://www.jsfromhell.com/dhtml/incremental-search">
Implements a GMail-like auto-complete.

[UPDATED CODE AND HELP CAN BE FOUND HERE]
</a>

@REQUIRES <a href="http://www.jsfromhell.com/geral/event-listener">Event-Listener</a>

//Requires http://www.jsfromhell.com/geral/event-listener

//+ Jonas Raoni Soares Silva
//@ http://jsfromhell.com/dhtml/incremental-search [v1.0]

IncrementalSearch = function( input, callback, className ){
	var i, o = ( o = this, o.l = [], o.i = input, o.c = null, o.s = { e: null, i: -1 }, o.f = callback || function(){}, o.n = className || "", o );
	for( i in { keydown: 0, focus: 0, blur: 0, keyup: 0, keypress: 0 } )
		addEventListener( o.i, i, function( e ){ o.handler.call( o, e ); } );
};
with( { p: IncrementalSearch.prototype } ){
	(p.constructor.fadeAway = function( o ){
		o instanceof Object ? ( this.trash = this.trash || [] ).push( o ) && setTimeout( this.fadeAway, 200 ) : arguments.callee.c.trash.pop().hide();
	}).c = p.constructor;
	p.callEvent = function( e ){ this[e] && this[e].apply( this, [].slice.call( arguments, 1 ) ); };
	p.highlite = function( e ){ ( this.s.e && ( this.s.e.className = "normal" ), ( this.s = { e: e, i: e.listindex } ).e.className += " highlited", this.callEvent( "onhighlite", this.l[ this.s.i ], this.s.e.d ) ); };
	p.select = function(){ this.s.i + 1 && ( this.i.value = this.l[ this.s.i ], this.callEvent( "onselect", this.i.value, this.s.e.d ), this.hide() ); };
	p.hide = function(){ ( this.c && this.c.parentNode.removeChild( this.c ), this.c = null, this.l = [], this.s = { e: null, i: -1 }, this.callEvent( "onhide" ) ); };
	p.next = function(){ var e = ( e = this.s.e ) ? e.nextSibling || e.parentNode.firstChild : null; e && this.highlite( e ); };
	p.previous = function(){ var e = ( e = this.s.e ) ? e.previousSibling || e.parentNode.lastChild : null; e && this.highlite( e ); };
	p.handler = function( evt ){
		var o = this, t = evt.type, k = evt.key, e = /span/i.test( ( e = evt.target ).tagName ) ? e.parentNode : e;
		t == "keyup" ? k != 40 && k != 38 && k != 13 && o.show()
		: t == "keydown" ? ( k == 40 && o.next() ) || ( k == 38 && o.previous() )
		: t == "keypress" ? k == 13 && !evt.preventDefault() && o.select()
		: t == "blur" ? o.constructor.fadeAway( o )
		: t == "click" ? o.select()
		: t == "focus" ? o.show()
		: o.highlite( e );
	};
	p.show = function(){
		var cS, found = 0, o = this, i = o.i, iV = i.value, d = document, c = ( o.hide(), o.c = d.body.appendChild( d.createElement( "div" ) ) );
		( c.className = o.n, cS = c.style, cS.display = "none", cS.position = "absolute", o.callEvent( "onshow" ) );
		o.f.call( function( s, x, data ){
			if( !( x.length == undefined ? ( x = [x] ) : x ).length )
				return;
			var j, l = 0, i = o.l.length, e = c.appendChild( d.createElement( "div" ) );
			for( j in ( o.l[i] = s, e.className = "normal", e.d = data, e.listindex = i, !found && i == o.s.i && ++found && o.highlite( e ), x ) )
				e.appendChild( d.createTextNode( s.substring( l, x[j] ) ) ).parentNode.appendChild( d.createElement( "span" ) ).appendChild( d.createTextNode( s.substring( x[j], l = x[j] + iV.length ) ) ).parentNode.className = "selectedText";
			for( x in ( e.appendChild( d.createTextNode( s.substr( l ) ) ), { click: 0, mouseover: 0 } ) )
				addEventListener( e, x, function( e ){ o.handler.call( o, e ); } );
		}, iV );
		if( !c.childNodes.length )
			return o.hide();
		for( var x = i.offsetLeft, y = i.offsetTop + i.offsetHeight; i = i.offsetParent; x += i.offsetLeft, y += i.offsetTop );
		( cS.display = "block", cS.left = x + "px", cS.top = y + "px", !found && o.highlite( c.firstChild ) );
	};
}


Example

<style type="text/css">
/*container da lista*/
.autocomplete{
	cursor: pointer;
	border: 1px solid #999;
	border-top: none;
	background: #eee;
}
/*caracteres que combinaram*/
.autocomplete .selectedText{ font-weight: bold; color: #008; }
/*items não selecionados*/
.autocomplete .normal{ border-top: 1px solid #999; overflow: hidden; white-space: pre; }
/*item selecionado*/
.autocomplete .highlited{ background: #ddf; }
</style>

<form action="">
	<fieldset>
		<legend>Preenchimento dinâmico</legend>
		<label for="list" >Emails</label>
		<input autocomplete="0" type="text" name="list" id="list" />
		<br />
		<label for="ip" >Lista de IPs</label>
		<textarea name="ip" rows="3" cols="20" id="ip"></textarea>
		<br />
	</fieldset>
</form>

<script type="text/javascript">
//<![CDATA[

var list = [ "192.168.0.1", "192.168.0.2", "192.168.0.3", "192.168.1.1", "192.168.1.2", "192.168.1.3", "200.168.0.1", "200.168.0.2", "200.168.0.3", "200.168.1.1", "200.168.1.2", "200.168.1.3" ];
new IncrementalSearch( document.forms[0].ip, function( search ){
	for( var i in list )
		if( !list[i].indexOf( search ) )
			this( list[i], 0 );
}, "autocomplete" );


var names = [ "João Alves <joao@123.com>", "Jonas Raoni Soares Silva <jonas@abc.com>", "Roberto <rob@net.net>", "Maria Fernanda <mariaf@i.tu>" ];

function retrieveNames( search ){
	search = search.toLowerCase();
	for( var i in names ){
		if( search ){
			for( var j = 0, indices = []; j = names[i].toLowerCase().indexOf( search, j ) + 1; indices[indices.length] = j - 1 );
			this( names[i], indices, i );
		}
		else
			this( names[i], 0, i );

	}
}

x = new IncrementalSearch( document.forms[0].list, retrieveNames, "autocomplete" );


//]]>
</script>