p:ajax 更新不适用于 p:selectBooleanCheckbox
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p:ajax update not working with p:selectBooleanCheckbox
提问by Cenobyte321
I'm using JSF 2 and Primefaces 4 and have the following issue:
我正在使用 JSF 2 和 Primefaces 4 并且有以下问题：
I've got the following code in my XHTML:
我的 XHTML 中有以下代码：
<h:form id="form">
<table>
<tr id="formats">
<td>Formats</td>
<td>
<p:selectBooleanCheckbox value="#{bean.entity.formatted}">
<p:ajax event="change" update="formatsSelect" />
</p:selectBooleanCheckbox>
<p:selectOneMenu id="formatsSelect" rendered="#{bean.entity.formatted}">
<f:selectItems value="#{bean.formats}" />
</p:selectOneMenu>
</td>
</tr>
</table>
</h:form>
It outputs a checkbox and a select menu and what I expect is that when I check the checkbox the select menu should appear and should disappear when I uncheck it.... but nothing happens, I check and uncheck it and the select menu is unaffected.
它输出一个复选框和一个选择菜单，我期望的是，当我选中复选框时，选择菜单应该出现，当我取消选中它时应该消失......但没有任何反应，我选中并取消选中它并且选择菜单不受影响.
In theory this should work since the selectBooleanCheckbox value is bound to the entity.formatted boolean value and the rendered value in the selectOneMenu is bound to the entity.formatted value and the p:ajax points to the correct id in the update attribute and the event is correct. This last bit I know since I created a listener in my bean that printed the value of formatted:
理论上这应该有效，因为 selectBooleanCheckbox 值绑定到 entity.formatted 布尔值，并且 selectOneMenu 中呈现的值绑定到 entity.formatted 值，并且 p:ajax 指向更新属性和事件中的正确 id是正确的。这是我知道的最后一点，因为我在我的 bean 中创建了一个监听器来打印 formatted 的值：
public void changeListener(){
System.out.println(this.entity.isFormatted());
}
And changed the p:ajax to:
并将 p:ajax 更改为：
<p:ajax event="change" update="formatsSelect" listener="#{bean.changeListener}" />
And it printed the value of formatted in the console. What am I doing wrong?
它在控制台中打印了 formatted 的值。我究竟做错了什么？
回答by Kishor Prakash
Since you used renderedon the component (p:selectOneMenu id="formatsSelect") and updating the same component, it wont work.
由于您rendered在组件 ( p:selectOneMenu id="formatsSelect") 上使用并更新了相同的组件，因此它不起作用。
Because that component might not have been added to/present in component tree by the time you are updating.
因为在您更新时，该组件可能尚未添加到/出现在组件树中。
So use a h:panelGrouparound it and update it and use renderedon p:selectOneMenu.
所以h:panelGroup在它周围使用 a并更新它并使用renderedon p:selectOneMenu。
<p:selectBooleanCheckbox value="#{bean.entity.formatted}">
<p:ajax event="change" update="formatsSelectPG" />
</p:selectBooleanCheckbox>
<h:panelGroup id="formatsSelectPG">
<p:selectOneMenu id="formatsSelect" rendered="#{bean.entity.formatted}">
<f:selectItems value="#{bean.formats}" />
</p:selectOneMenu>
</h:panelGroup>
