easyui implements drop-down list multiple selection

			   <td width="15%" class="main_form_tabletitle">所属地区：</td>
			   <td width="35%">
			   		<input id="orgCode" name="orgCode"  class="easyui-combobox" required=true missingMessage="必填">
			   </td>

$(function(){
	
	//Initialize the multi-select checkbox (area)
	initCombobox ('orgCode');
});

function initCombobox(id){
	var selectedText = [];
    //Load the dropdown box checkbox  
    $('#'+id).combobox({  
        url:'/promotionReward/queryEngineerFixAssignArea.do', //The url to get the drop-down box data in the background
        method:'post',  
        panelHeight: 200,//Set to a fixed height, a vertical scroll bar appears in the combobox  
        valueField:'deptCode',  
        textField:'deptName',  
        multiple:true,
        editable:false,
        formatter: function (row) { //The formatter method is to implement the method of adding a checkbox in front of each drop-down option  
            var opts = $(this).combobox('options');
            if($('#deptCode').val().indexOf(row[opts.valueField]) != -1){
            	selectedText.push(row[opts.valueField]);
            	return '<option selected="selected">' + row[opts.textField] + '</option>';
            }else{
            	return '<option>' + row[opts.textField] + '</option>';
            }
        },  
        onLoadSuccess: function () { //The drop-down box data is loaded successfully and called  
        	$(this).combobox('setValues', selectedText);//fill data
        },  
        onSelect: function (row) { //Called when an option is selected  
            
            $(this).combobox('setValues', $(this).combobox('getValues'));
             
        },  
        onUnselect: function (row) {//Called when an option is not selected  
        }  
    });  
}