jQuery EasyUI 为Combo,Combobox添加清除值功能的实例

(function($){
 
 //初始化清除按钮
 function initClear(target){
 var jq = $(target);
 var opts = jq.data('bo').options;
 var bo = jq.data('bo').bo;
 var arrow = bo.find('span.bo-arrow');
 
 var clear = arrow.siblings("span.bo-clear");
 if(clear.size()==0){
  //创建清除按钮。
  clear = $('<span class="bo-clear" style="height: 20px;"></span>');
  
  //清除按钮添加悬停效果。
  clear.unbind("mouseenter.bo mouseleave.bo").bind("mouseenter.bo mouseleave.bo",
  function(event){
   var isEnter = event.type=="mouseenter";
   clear[isEnter ? 'addClass' : 'removeClass']("bo-clear-hover");
  }
  );
  //清除按钮添加点击事件，清除当前选中值及隐藏选择面板。
  clear.unbind("click.bo").bind("click.bo",function(){
  jq.bo("setValue","").bo("setText","");
  jq.bo('hidePanel');
  });
  arrow.before(clear);
 };
 var input = bo.find("input.bo-text");
 input.outerWidth(input.outerWidth()-clear.outerWidth());
 
 opts.initClear = true;//已进行清除按钮初始化。
 }
 
 //扩展easyui bo添加清除当前值。
 var oldResize = $.fn.bo.methods.resize;
 $.extend($.fn.bo.methods,{
 initClear:function(jq){
  return jq.each(function(){
   initClear(this);
  });
 },
 resize:function(jq){
  //调用默认bo resize方法。
  var returnValue = oldResize.apply(this,arguments);
  var opts = jq.data("bo").options;
  if(opts.initClear){
  jq.bo("initClear",jq);
  }
  return returnValue;
 }
 });
}(jQuery));

<select id="myselect" panelHeight="auto" style="width: 102px;" editable="true" name="itcast">
 <option value="0">成都</option>
 <option value="1">传智播客</option>
 <option value="2">姚欣</option>
 <option value="3">小星星</option>
</select>

$('#myselect').bobox({
 required : true,
 editable : false
}).bobox("initClear");

.bo-clear {
 background-color: #E0ECFF;
 width: 18px;
 height: 20px;
 overflow: hidden;
 display: inline-block;
 vertical-align: ;
 cursor: pointer;
 opacity: 0.6;
 filter: alpha(opacity=60);
 background: url('images/bo_clear.png') no-repeat center center;
}
.bo-clear-hover {
 opacity: 1.0;
 filter: alpha(opacity=100);
 background-color: #eaf2ff;
}