通过ajax渲染其他表单会导致其视图状态丢失，我该如何添加回来? [英] Rendering other form by ajax causes its view state to be lost, how do I add this back?

问题描述

我有

<h:form>
    <h:commandLink action="#{my_fake_ajax_link}">
        <h:outputText value="Link" />
        <f:ajax render=":mydiv" />
    </h:commandLink>
</h:form>

<h:panelGroup layout="block" id="mydiv">
    <h:form>
        <h:commandLink action="#{mybean.delete(0)}">
            <h:outputText value="Here" />
            <f:ajax render="@form" />
        </h:commandLink>
    </h:form>
</h:panelGroup>

当我在my_fake_ajax_link"上单击一次时，我必须在delete"链接上单击两次.这只是一个例子.我没有这个真实案例.我在一个页面上有多个表单，我不能将它们全部添加到一个表单中.

When I click once on "my_fake_ajax_link", then I have to click twice on "delete" link. This is only an example. I don't have this real case. I have multiple forms on a page and I can't just add all of them in a single form.

我检查了问题所在:

• 当您单击my_fake_ajax_link"时，mydiv 会按照应有的 ajax 刷新.
• 缺少 ajax 上刷新的表单的 ViewState.

• When you click on "my_fake_ajax_link", the mydiv refreshs with ajax as it should.
• ViewState of the refreshed form on ajax is missing.

如何添加 ViewState?如何在不使用一种形式的情况下使其工作?对我来说，这看起来像是一个 JSF 错误.我不想用

How can I add the ViewState? How can I make it work without using only one form? This looks like an JSF bug to me. I don't want to refresh that div automatically with

jQuery("#mydiv").load(document.location.href);

但我会在最坏的情况下.

but I will in my worst case possible.

推荐答案

这是处理 ajax 响应的 JSF 自动包含的 jsf.js 库中的一个已知问题.另请参阅 JSF 规范问题 790，该问题已在即将推出的 JSF 2.3 中修复.同时，对于 JSF 2.0/2.1/2.2，您必须在 render 属性中明确指定其他 的 ID 以触发适当的添加视图状态.

This is a known problem in the auto-included jsf.js library of JSF which handles ajax responses. See also JSF spec issue 790 which is fixed in the upcoming JSF 2.3. In the meanwhile, with JSF 2.0/2.1/2.2, you have to explicitly specify the ID of the other <h:form> inside the render attribtue to trigger proper addition of the view state.

<h:form>
    <h:commandLink action="#{my_fake_ajax_link}">
        <h:outputText value="Link" />
        <f:ajax render=":mydiv :mydivForm" />
    </h:commandLink>
</h:form>

<h:panelGroup layout="block" id="mydiv">
    <h:form id="mydivForm">
        <h:commandLink action="#{mybean.delete(0)}">
            <h:outputText value="Here" />
            <f:ajax render="@form" />
        </h:commandLink>
    </h:form>
</h:panelGroup>

不，这不会导致 ajax 响应中的任何开销或标记重复.或者，使用 OmniFaces fixviewstate.js.

No, this does not cause any overhead or markup duplication in the ajax response. Alternatively, use OmniFaces fixviewstate.js.

• JSF 2.0 中的通信 - 内容的 Ajax 渲染包含另一种形式
• h:commandButton/h:commandLink 不适用于第一次点击，仅适用于第二次点击

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