在JSF 2.0中将selectOneMenu与验证一起使用

Question

I am trying to building a drop down menu using JSF 2.0, and add a validation when the use submit the form with "Please Select" selected in the menu.

<h:selectOneMenu id="templateMenu" value="#{bean.list}" required="true" requiredMessage="Please select a value.">
    <f:selectItem itemLabel="Please Select" noSelectionOption="true" />
    <f:selectItem itemLabel="Item01" itemValue="1"/>
    <f:selectItem itemLabel="Item02" itemValue="2"/>
    <f:selectItem itemLabel="Item03" itemValue="3"/>
    <f:selectItem itemLabel="Item04" itemValue="4"/>
    <f:validateRequired/>
</h:selectOneMenu>

However when I submit the page with "Please Select" selected, the validation doesn't fire, it just stay in the same page.

If anyone know what's happening please could you help me?

Thanks a lot!!

Answer 1

You need h:message for your selectOneMenu. Which will display the message of requiredMessage of selectOneMenu .

<h:message for="templateMenu"/>
<h:selectOneMenu id="templateMenu" value="#{csvUploadBean.selectedTemplate}"  required="true" requiredMessage="This value is required.">
    .....
</h:selectOneMenu>