为什么要“渲染" JSF 2.0?不刷新页面无法正常工作吗? [英] why JSF 2.0 "rendered" does not work without refreshing the page?

问题描述

当我单击一种方法来渲染页面的一部分时，除非手动刷新页面，否则它不会更改任何内容.

When I click a method to render a part of the page, it does not change anything until I manually refresh the page.

这是豆子:

boolean showPage = true;

public boolean getShowPage(){
    return showPage;
}

这是视图:

<h:form>
    <p:commandButton value="Click" action="#{bean.hideContents()}" />
</h:form>

<p:panel rendered="#{bean.showPage}">
    Contents 
</p:panel>

当我手动刷新页面时，该面板将隐藏，否则不会隐藏. 这是怎么引起的，我该如何解决?

The panel gets hidden when I manually refresh the page, otherwise it does not. How is this caused and how can I solve it?

推荐答案

您需要更新条件渲染组件的父组件.您可以通过在<p:commandButton>的update属性中指定其客户端ID来做到这一点:

You need to update a parent component of the conditionally rendered component. You can do that by specifying its client ID in the update attribute of the <p:commandButton>:

<h:form>
    <p:commandButton value="Click" action="#{bean.hideContents}" update=":panel" />
</h:form>

<h:panelGroup id="panel">
    <p:panel rendered="#{bean.showPage}">
        Contents 
    </p:panel>
</h:panelGroup>

另请参见:

• 如何查找客户端用于ajax更新/渲染的组件的ID?找不到表达式为"foo"的组件；引用自"bar"
• 为什么我需要嵌套带有render ==#{some}"的组件?在另一个组件中，当我想对其进行ajax更新时?

See also:

• How to find out client ID of component for ajax update/render? Cannot find component with expression "foo" referenced from "bar"
• Why do I need to nest a component with rendered="#{some}" in another component when I want to ajax-update it?

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