JQuery EasyUI 动态改变表单项的验证守则

//JQuery EasyUI 动态改变表单项的验证规则
$(document).ready(function(){
$('#FILE_QUALITY').combobox({
onChange:function(newValue,oldValue){
if(newValue == 2){
$('#FRONT_FOR_UNIT').validatebox({
required: false
});
} else if(newValue == 0){
$('#FRONT_FOR_UNIT').validatebox({
required: true,
validType: 'length[1,512]'
});
}
$.parser.parse($("#FRONT_FOR_UNIT"));
}
});
});