jQuery.fn.extend({
	selectbox: function(options) {
		return this.each(function() {
			new jQuery.SelectBox(this, options);
		});
	}
});


/* pawel maziarz: work around for ie logging */
if (!window.console) {
	var console = {
		log: function(msg) { 
	 }
	}
}
/* */

jQuery.SelectBox = function(selectobj, options) {
	
	var opt = options || {};
	opt.inputClass = opt.inputClass || "selectbox";
	opt.containerClass = opt.containerClass || "selectbox-wrapper";
	opt.hoverClass = opt.hoverClass || "current";
	opt.currentClass = opt.selectedClass || "selected"
	opt.debug = opt.debug || false;
	
	var elm_id = selectobj.id;
	var active = 0;
	var inFocus = false;
	var hasfocus = 0;
	//jquery object for select element
	var $select = $(selectobj);
	// jquery container object
	var $container = setupContainer(opt);
	//jquery input object 
	var $input = setupInput(opt);
	// hide select and append newly created elements
	$select.hide().before($input).before($container);
	
	init();
	
	$input
	.click(function(){
    if (!inFocus) {
		  $container.toggle();
		}
	})
	/*//del onfocus event listener 
		//ck begin
	.focus(function(){
	   if ($container.not(':visible')) {
	       inFocus = true;
	       $container.show();
	   }
	})*///ck end
	.keydown(function(event) {	   
		switch(event.keyCode) {
			case 38: // up
				event.preventDefault();
				moveSelect(-1);
				break;
			case 40: // down
				event.preventDefault();
				moveSelect(1);
				break;
			//case 9:  // tab 
			case 13: // return
				event.preventDefault(); // seems not working in mac !
				$('li.'+opt.hoverClass).trigger('click');
				break;
			case 27: //escape
			  hideMe();
			  break;
		}
	})
	.blur(function() {
		if ($container.is(':visible') && hasfocus > 0 ) {
			if(opt.debug) console.log('container visible and has focus')
		} else {
		  // Workaround for ie scroll - thanks to Bernd Matzner
		  if($.browser.msie || $.browser.safari){ // check for safari too - workaround for webkit
		//ck begin
		var t=document.activeElement.getAttribute('id');
        if(t==null || t.indexOf('_container')==-1){
        //ck end
          hideMe();
        } else {
          $input.focus();
        }
      } else {
        hideMe();
      }
		}
	});


	function hideMe() { 
		hasfocus = 0;
		$container.hide(); 
	}
	
	function init() {
		$container.append(getSelectOptions($input.attr('id'))).hide();
		var width = $input.css('width');

    }
	
	function setupContainer(options) {
		var container = document.createElement("div");
		$container = $(container);
		$container.attr('id', elm_id+'_container');
		$container.addClass(options.containerClass);
		
		return $container;
	}
	
	function setupInput(options) {
		var input = document.createElement("input");
		var $input = $(input);
		$input.attr("id", elm_id+"_input");
		$input.attr("type", "text");
		$input.addClass(options.inputClass);
		$input.attr("autocomplete", "off");
		$input.attr("readonly", "readonly");
		$input.attr("tabIndex", $select.attr("tabindex")); // "I" capital is important for ie
		
		return $input;	
	}
	
	function moveSelect(step) {
		var lis = $("li", $container);
		if (!lis || lis.length == 0) return false;
		active += step;
    //loop through list
		if (active < 0) {
			active = lis.size();
		} else if (active > lis.size()) {
			active = 0;
		}
    scroll(lis, active);
		lis.removeClass(opt.hoverClass);

		$(lis[active]).addClass(opt.hoverClass);
	}
	
	function scroll(list, active) {
      var el = $(list[active]).get(0);
      var list = $container.get(0);
      
      if (el.offsetTop + el.offsetHeight > list.scrollTop + list.clientHeight) {
        list.scrollTop = el.offsetTop + el.offsetHeight - list.clientHeight;      
      } else if(el.offsetTop < list.scrollTop) {
        list.scrollTop = el.offsetTop;
      }
	}
	
	function setCurrent() {
		$input.val('');
		$select.find("option").attr("selected",false);
		//alert($("li."+opt.currentClass, $container).length);
		//$("li."+opt.currentClass, $container)
		//$('#' + elm_id + '_container' + ' li.'+opt.currentClass)
		$("li."+opt.currentClass, $container).each(function (i){
			var li = this;
			var ar = (''+li.id).split('_');
			var el = ar[ar.length-1];
			//alert(el);
			$select.find("option[value='"+el+"']").attr("selected",true);
			//$select.val(el);
			//ck add
			//$input.val($(li).html());
			if(i==0){
				$input.val($(li).text());
			}else{
				$input.val($input.val()+","+$(li).text());
			}
			
		});
		
			
		
		return true;
	}
	
	// select value
	function getCurrentSelected() {
		return $select.val();
	}
	
	// input value
	function getCurrentValue() {
		return $input.val();
	}
	
	function getSelectOptions(parentid) {
		var select_options = new Array();
		var ul = document.createElement('ul');
		//jQuery(ul).jscroll({W:"6px",Btn:{btn:false}});//设置了滚动条宽度
		//alert($(ul));
		$select.children('option').each(function() {
			var li = document.createElement('li');
			li.setAttribute('id', parentid + '_' + $(this).val());
			
			//li.innerHTML = $(this).html();
			// ck add begin
			var multiple=$select.attr('multiple');
			if(multiple){
				li.innerHTML = '<div style="overflow:auto"><div style="float:left">'+$(this).html()+'</div><input type="checkbox" style="float:right"/></div>';
			}else{
				li.innerHTML = $(this).html();
			}
			//ck add end
			if ($(this).is(':selected')) {
				//ck add
				//$input.val($(this).html());
				$input.val($(this).text());
				$(li).addClass(opt.currentClass);
				var cb=$(li).find("input[type='checkbox']");
				cb.attr('checked',true);
			}
			
			ul.appendChild(li);
			$(li)
			.mouseover(function(event) {
				hasfocus = 1;
				if (opt.debug) console.log('over on : '+this.id);
				//jQuery(event.target, $container).addClass(opt.hoverClass);
				$(this).addClass(opt.hoverClass);
			})
			.mouseout(function(event) {
				hasfocus = -1;
				if (opt.debug) console.log('out on : '+this.id);
				//jQuery(event.target, $container).removeClass(opt.hoverClass);
				$(this).removeClass(opt.hoverClass);
			})
			.click(function(event) {
			  var fl = $('li.'+opt.hoverClass, $container).get(0);
				if (opt.debug) console.log('click on :'+this.id);
				var multiple=$select.attr('multiple');
				
				if(!multiple){
					$("li."+opt.currentClass, $container).removeClass(opt.currentClass);
					//$('#' + elm_id + '_container' + ' li.'+opt.currentClass).removeClass(opt.currentClass);
					//alert($('#' + elm_id + '_container' + ' li.'+opt.currentClass).length)
				}
				//alert($("li."+opt.currentClass, $container).length);
				$(this).toggleClass(opt.currentClass);
				setCurrent();
				$select.change();
				$select.get(0).blur();
				if(multiple){
					var cb=$(this).find("input[type='checkbox']");
					cb.attr('checked',$(this).hasClass(opt.currentClass));
					
					$input.focus();
				}else{
					hideMe();
				}
			});
		});
		return ul;
	}
	
	
	
};