better jQuery autoselect

gistfile1.js

/*! jQuery UI - v1.8.23 - 2012-08-15
* https://github.com/jquery/jquery-ui
* Includes: jquery.ui.core.js
* Copyright (c) 2012 AUTHORS.txt; Licensed MIT, GPL */
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* https://github.com/jquery/jquery-ui
* Includes: jquery.ui.widget.js
* Copyright (c) 2012 AUTHORS.txt; Licensed MIT, GPL */
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* https://github.com/jquery/jquery-ui
* Includes: jquery.ui.position.js
* Copyright (c) 2012 AUTHORS.txt; Licensed MIT, GPL */
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* https://github.com/jquery/jquery-ui
* Includes: jquery.ui.autocomplete.js
* Copyright (c) 2012 AUTHORS.txt; Licensed MIT, GPL */
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d.test(a.label||a.value||a)})}})})(jQuery),function(a){a.widget("ui.menu",{_create:function(){var b=this;this.element.addClass("ui-menu ui-widget ui-widget-content ui-corner-all").attr({role:"listbox","aria-activedescendant":"ui-active-menuitem"}).click(function(c){if(!a(c.target).closest(".ui-menu-item a").length)return;c.preventDefault(),b.select(c)}),this.refresh()},refresh:function(){var b=this,c=this.element.children("li:not(.ui-menu-item):has(a)").addClass("ui-menu-item").attr("role","menuitem");c.children("a").addClass("ui-corner-all").attr("tabindex",-1).mouseenter(function(c){b.activate(c,a(this).parent())}).mouseleave(function(){b.deactivate()})},activate:function(a,b){this.deactivate();if(this.hasScroll()){var c=b.offset().top-this.element.offset().top,d=this.element.scrollTop(),e=this.element.height();c<0?this.element.scrollTop(d+c):c>=e&&this.element.scrollTop(d+c-e+b.height())}this.active=b.eq(0).children("a").addClass("ui-state-hover").attr("id","ui-active-menuitem").end(),this._trigger("focus",a,{item:b})},deactivate:function(){if(!this.active)return;this.active.children("a").removeClass("ui-state-hover").removeAttr("id"),this._trigger("blur"),this.active=null},next:function(a){this.move("next",".ui-menu-item:first",a)},previous:function(a){this.move("prev",".ui-menu-item:last",a)},first:function(){return this.active&&!this.active.prevAll(".ui-menu-item").length},last:function(){return this.active&&!this.active.nextAll(".ui-menu-item").length},move:function(a,b,c){if(!this.active){this.activate(c,this.element.children(b));return}var d=this.active[a+"All"](".ui-menu-item").eq(0);d.length?this.activate(c,d):this.activate(c,this.element.children(b))},nextPage:function(b){if(this.hasScroll()){if(!this.active||this.last()){this.activate(b,this.element.children(".ui-menu-item:first"));return}var c=this.active.offset().top,d=this.element.height(),e=this.element.children(".ui-menu-item").filter(function(){var b=a(this).offset().top-c-d+a(this).height();return b<10&&b>-10});e.length||(e=this.element.children(".ui-menu-item:last")),this.activate(b,e)}else this.activate(b,this.element.children(".ui-menu-item").filter(!this.active||this.last()?":first":":last"))},previousPage:function(b){if(this.hasScroll()){if(!this.active||this.first()){this.activate(b,this.element.children(".ui-menu-item:last"));return}var c=this.active.offset().top,d=this.element.height(),e=this.element.children(".ui-menu-item").filter(function(){var b=a(this).offset().top-c+d-a(this).height();return b<10&&b>-10});e.length||(e=this.element.children(".ui-menu-item:first")),this.activate(b,e)}else this.activate(b,this.element.children(".ui-menu-item").filter(!this.active||this.first()?":last":":first"))},hasScroll:function(){return this.element.height()<this.element[a.fn.prop?"prop":"attr"]("scrollHeight")},select:function(a){this._trigger("selected",a,{item:this.active})}})}(jQuery);;
(function( $ ) {
  $.fn.betterAutocomplete = function(source,callback,length) {
	var length = length || 4
	
	if( $().autocomplete != 'undefined' ) {
		$(this).autocomplete({
						source: source,
						minLength: length,
						select: function( event, ui ) {
							callback(event,ui);
						}
		})
		.bind('keydown',function(e){
			if( e.keyCode == 13  || e.keyCode == 9 ) {
				$('.ui-autocomplete li:first a').mousedown()
				var li = $('li.ui-menu-item:first')[0], item = $(li).data("item.autocomplete");
				$(this).data("autocomplete").options.select(event, {item: item});
				$(this).autocomplete( "search" , [''] )
			}
		})
	}
  };
})( jQuery );