combobox

lanpade

combobox如何让其默认显示空项?

<div id="businesschannelId" name="couponInfo.businesschannelId" class="mini-combobox" style="width:150px;" textField="channelName" valueField="id" url=" " dataField="busChannList" required = "required" requiredErrorText="不能为空!" showNullItem="true" nullItemText="---请选择---"></div>


就是让其默认显示---请选择---?

felt

<div id="businesschannelId" name="couponInfo.businesschannelId" class="mini-combobox" style="width:150px;" textField="channelName" emptyText="---请选择---"
     valueField="id" url=" " dataField="busChannList" required = "required" requiredErrorText="不能为空!" showNullItem="true" nullItemText="---请选择---"></div>