JSF跳过Required-Validation而不使用即时= true [英] JSF skip Required-Validation without immediate=true

问题描述

我有多种形式，其中有必填字段和可选字段.

I have multiple forms, where I have mandatory fields and optional fields.

要提交这样的表格，我需要对必须执行的required-attribute进行验证，效果很好. 要取消这样的表单，我使用了p:commandbutton上的属性immediate="true"，这使得它的操作在 Apply Request Values -Phase阶段发生，如下所示:如何在单击特定按钮时跳过验证?

To submit such a form I require the validation on the required-attribute to be executed, which works fine. To cancel such a form I use the attribute immediate="true" on the p:commandbutton, which makes its action happen during the Apply Request Values-Phase as addressed here: How to skip validation when a specific button is clicked?

但是，对于大型表格，我想为用户提供一个保存"按钮，以便他以后可以继续.

However, for large forms I want to provide the user with a Save-Button, so he can proceed later.

仅保存当前状态，我还想忽略对必填属性的验证.但是，使用immediate="true"不起作用，因为那样，我的save方法simple不会保存任何内容，因为JSF生命周期从未达到"UpdateModelValues"阶段. (根据 http://www.javacodegeeks.com/2012/01/jsf-and-immediate-attribute-command.html )

For just saving the current state I also want to ignore the validation of the required-attribute. However, using immediate="true" is not working, because then my save method simple saves nothing, because the JSF lifecycle never hits the "UpdateModelValues"-Phase. (Acording to http://www.javacodegeeks.com/2012/01/jsf-and-immediate-attribute-command.html )

那么，如何绕过必需检查而不跳过生命周期的一半?

So, how to bypass the required-check but not skip half the lifecycle?

推荐答案

每个按钮只要在表单列表中，就在Param-List中创建一个条目. 因此，我简单地对"required"参数应用了该条目的检查:

Each Button creates an entry inside the Param-List as long as it's member of the form. So I simple applied a check for the presence of that entry to the "required" parameter:

<h:form id="form" prependId="true">
...
<p:inputText id="someId"
    required="#{param['form:save']==null}" ... />
...
<p:commandButton id="save" value="Save" />
<p:commandButton id="submit" value="Submit" />
<p:commandButton id="cancel" value="Cancel" immediate="true" />
</h:form>

当我单击提交"时，param['form:save']是NULL，然后将表达式转换为true，以便执行验证.

When I click "Submit" the param['form:save'] is NULL, which then turns the expression to true so the validation is executed.

当我单击保存"时，param['form:save']是NOT NULL(但为空！)，它解析为false，因此验证被忽略. (或者说，JSF认为这不是必填字段，因为表达式beeing被评估为false)

When I click "Save" the param['form:save'] is NOT NULL (but empty!), which resolves to false so the validation is ignored. (Or let's say JSF thinks it is not a required field due to the expression beeing evaluated to false)

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