OmniFaces o：在ui中的validateAllOrNone：repeat或h：dataTable [英] OmniFaces o:validateAllOrNone in ui:repeat or h:dataTable

问题描述

可以在< ui：repeat>之内使用OmniFaces < o：validateAllOrNone> （这是非常酷的）） 或< h：dataTable> ？

Is it possible to use OmniFaces <o:validateAllOrNone> (which is pretty cool ;)) within an <ui:repeat> or <h:dataTable>?

我需要一个表，具有输入字段列。您可以填写这些值中的所有值或全部值。

I need a table with each row having an input field column. You could either fill in none of these values or all of them.

如果我将< o：validateAllOrNone> 在< ui：repeat> 或< h：dataTable> 中，并使用输入的ID在组件属性中，如果所有字段都为空，则验证器也会被触发。

If I put the <o:validateAllOrNone> within the <ui:repeat> or <h:dataTable> and use the id of the input field in components attribute, then the validator also gets triggered, if all fields are empty.

推荐答案

不，这是不可能的。 组件属性必须在物理上引用多个组件，而不是单个渲染多个组件。然而，它可以用于在相同迭代期间呈现的物理多个组件。多重验证器不是为了引用多次渲染的单个组件而设计的，< o：validateXxx> 唯一的OmniFaces验证器是< o：validateUniqueColumn> 。

No, that's not possible. The components attribute must refer physically multiple components, not a single component which is rendered multiple times. It can however be used on physically multiple components which are rendered during same iteration round. The <o:validateXxx> multi field validator is not designed to reference a single component which is rendered multiple times. The only OmniFaces validator which does that is <o:validateUniqueColumn>.

如果要使用< o：validateXxx> 基于集合的动态输入的多字段验证器，那么你最好的选择是使用JSTL < c：forEach> / code>。它将构建多个组件。

If you want to use the <o:validateXxx> multi field validator on dynamic inputs based on a collection, then your best bet is to use JSTL <c:forEach>. It will build physically multiple components.

例如

<c:forEach items="#{bean.items}" var="item" varStatus="loop">
    <h:inputText id="input_#{loop.index}" value="#{item.value}" />
</c:forEach>

假设有3个项目，这将动态创建ID为$ code的JSF组件> input_0 ， input_1 和 input_2 。那么你可以使用< o：validateXxx> 如下（将其放在循环之外！）

Assuming that there are 3 items, this will dynamically create JSF components with IDs of input_0, input_1 and input_2. Then you can just use <o:validateXxx> as follows (put it outside the loop!)

<o:validateAllOrNone components="input_0 input_1 input_2" />

您可以通过EL表达式替换上述示例中的硬编码字符串，返回所需的空格分隔字符串来自支持bean的组件ID。

You can replace the hardcoded string in the above example by an EL expression which returns the desired space separated string of component IDs from a backing bean.

<o:validateAllOrNone components="#{bean.inputIds}" />

另一种方法是创建一个< x：validateAllOrNoneColumn> 或在OmniFaces问题跟踪器上发布增强请求。更改现有的< o：validateAllOrNone> 这是一个完全独立的组件，这不是很简单。

An alternative would be to create a <x:validateAllOrNoneColumn> yourself or to post an enhancement request at OmniFaces issue tracker. It would be not exactly trivial to alter the existing <o:validateAllOrNone> that a completely separate component is desired.

这篇关于OmniFaces o：在ui中的validateAllOrNone：repeat或h：dataTable的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！