easyui textbox 设置属性editable: false, required: true 表单验证的时候会不弹出提示信息

$("#CustID").textbox({
missingMessage: '此项必输',
prompt: '请单击右侧\'放大镜\'按钮进行操作!', editable: false, tipPosition: 'bottom', required: true, multiline: false, width: '350px',
buttonText: '', buttonIcon: 'icon-search', onClickButton: function () { GetSysPointId(); },
icons: [{
iconCls: 'icon-clear',
handler: function (e) {
$(e.data.target).textbox('clear');
}
}]
});

你这种起码要在textbox点击事件里触发吧。还有，干嘛这么用，easyui 里textbox 有专门的class设置提醒

<input name="politicalType" id="politicalType" style="width:150px;" 
class="easyui-textbox" data-options="editable:false;required: true" onchange="change()">