selectOneMenu 中的 hideNoSelectionOption 未按预期工作 [英] hideNoSelectionOption in selectOneMenu is not working as expected

问题描述

我有以下 selectOneMenu 并且在我的组件中我想要一个不应显示的项目，例如如果来自 #{Mybean.value} 的值与来自 #{Mybean.ListValues} 的值匹配，我不想在我的组合框中有一个空选项.

I have the following selectOneMenu and within of my component I want to have an item which shouldn't be shown, for e.g. in cases where the value from #{Mybean.value} match a value from #{Mybean.ListValues} I don't want to have an empty option in my combo box .

  <p:selectOneMenu value="#{Mybean.value}"  hideNoSelectionOption="true"     
   required="true" requiredMessage="Required data">

      <f:selectItem itemLabel="" itemValue="#{null}" noSelectionOption="true" />
      <f:selectItems value="#{Mybean.ListValues}" var="option"  itemLabel="#{option.optionName}"   
      itemValue="#{option.optionId}"/>
 </p:selectOneMenu>

我搜索过，但没有找到任何有用的东西，只有一个primefaces 论坛 哪里描述了这个问题.

I searched, but I didn't find anything useful, just one link in primefaces forum where describes exactly this problem.

我的 primefaces 版本是 3.5

My primefaces version is 3.5

推荐答案

从版本 9 开始支持它，请参阅其他答案.

该属性在官方api或doc.你从哪里得到的?

That attribute doesn't exist in the official api or in the doc. Where did you get it from?

您实际上要寻找的是<f:selectItems 组件上的 code>itemDisabled 属性.正是此属性禁止选择 selectItem.从历史上看，primefaces 在该属性方面存在问题.

What you're actually looking for is the itemDisabled attribute on the f:selectItems component. It's this attribute that disables a selectItem from being selected. Historically, primefaces has had problems with that attribute.

理想情况下，你应该有

   <p:selectOneMenu value="#{Mybean.value}" required="true" requiredMessage="Required data">
       <f:selectItem itemLabel="" itemValue="#{null}" noSelectionOption="true" />
       <f:selectItems itemDisabled="#{Mybean.value=='aValue'}" value="#{Mybean.ListValues}" var="option" itemLabel="#{option.optionName}"      itemValue="#{option.optionId}"/>
  </p:selectOneMenu>

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