带有定制组件属性的验证器

问题描述

我想为自定义组件创建验证器，并在其中传递一些属性.这就是代码的样子(它不是原始代码，但是以相同的方式实现):

I want to create validator for custom component where I want to pass few attributes. This is how code looks like (it's not original code but is implemented in the same way):

自定义组件(customComponent.xhtml)

Custom component (customComponent.xhtml)

<h:body>
    <composite:interface componentType="compositeComponent">
        <composite:attribute name="name" required="true" />
        <composite:attribute name="value" required="true" />
        <composite:attribute name="values" required="true" />
        <composite:editableValueHolder name="validator" targets="#{cc.attrs.id}"/>
    </composite:interface>
    <composite:implementation>
        <h:selectOneMenu value="#{cc.attrs.value}" id="#{cc.attrs.id}">
            <f:selectItems value="#{cc.attrs.values}" var="item" itemValue="#{item.value}" itemLabel="#{item.label}" />
            <composite:insertChildren/>
        </h:selectOneMenu>
    </composite:implementation>
</h:body>

如您所见，我想将验证器传递给h:selectOneMenu.可以通过以下方式使用组件(准确地说是应该是"，因为它当前不起作用):

As you can see I want to pass validator to h:selectOneMenu. Component can be (to be more precisely 'should be' because it currently doesn't work) used in this way:

<ns:customComponent name="myComp" value="#{controller.value}" values="#{controller.values}">
    <f:validator validatorId="myValidator" for="validator">
        <f:attribute name="param1" value="param1Value"/>
        <f:attribute name="param1" value="param1Value"/>
    </validator>
</ns:customComponent>

我测试了此代码，如果我没有将属性传递给它，则调用验证程序.

I tested this code and validator is called if i don't pass attributes into it.

<ns:customComponent name="myComp" value="#{controller.value}" values="#{controller.values}">
    <f:validator validatorId="myValidator" for="validator"/>
</ns:customComponent>

我发现属性可以通过这种方式传递:

I found that attributes can be passed in this way:

<ns:customComponent name="myComp" value="#{controller.value}" values="#{controller.values}">
    <f:validator validatorId="myValidator" for="validator"/>
    <f:attribute name="param1" value="param1Value"/>
    <f:attribute name="param1" value="param1Value"/>
</ns:customComponent>

但是(据我所知)，只有验证器会注入到自定义组件中(这就是为什么在验证器上设置for="validator"的原因)，所以我将无法获得这些属性.如何将属性传递给此验证器?

but (as far as I know) only validator will be injected to custom component (thats why for="validator" is set on validator) so I won't be able to get these attributes. How can I pass attributes to this validator?

顺便说一句.如果可能的话，我希望将参数作为嵌套元素进行传递，因为它看起来更加清晰.这个:

BTW. If it's possible I will want to pass parameters as nested elements because it looks more clear. This one:

<f:selectOneMenu>
    <f:validator validatorId="myValidator">
        <f:attribute name="param1" value="value1"/>
    </f:validator>
</f:selectOneMenu>

代替这个:

<f:selectOneMenu>
    <f:validator validatorId="myValidator"/>
    <f:attribute name="param1" value="value1"/>
</f:selectOneMenu>

推荐答案

我发现<f:validator/>不能具有嵌套元素，因此该元素不起作用:

I found that <f:validator/> cant have nested elements so this one won't work:

<f:validator validatorId="myValidator">
    <f:attribute name="param1" value="value1"/>
</f:validator>

为解决我的问题，我创建了自定义验证器.为此，我必须:

To solve my problem I've created custom validator. To do it I had to:

在WEB-INF目录中创建taglib.xml文件.

<?xml version="1.0"?>
<!DOCTYPE facelet-taglib PUBLIC
  "-//Sun Microsystems, Inc.//DTD Facelet Taglib 1.0//EN"
  "http://java.sun.com/dtd/facelet-taglib_1_0.dtd">
<facelet-taglib>
    <namespace>http://customtag.com/tags</namespace>
    <tag>
        <tag-name>uniqueValidator</tag-name>
        <validator>
            <validator-id>simpleValidator</validator-id>
        </validator>
        <!-- To show hints on this component add this but it's not required -->
        <attribute>
            <description>List of elements to check. Validation succeeds if each item is unique (equals() method is used to compare items).</description>
            <name>items</name>
            <required>true</required>
        </attribute>
    </tag>
</facelet-taglib>

在web.xml

<context-param>
    <param-name>javax.faces.FACELETS_LIBRARIES</param-name>
    <param-value>/WEB-INF/taglib.xml</param-value>
</context-param>

编写验证码

package validator;

import java.util.List;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.FacesValidator;
import javax.faces.validator.Validator;
import javax.faces.validator.ValidatorException;

@FacesValidator("simpleValidator")
public class SimpleValidator implements Validator {

    private List<Object> items;

    @Override
    public void validate(final FacesContext arg0, final UIComponent arg1, final Object arg2) throws ValidatorException {
        // use items list
    }

    public void setItems(final List<Object> items) {
        this.items = items;
    }

}

这是在视图/复合组件中使用它的方式:

This is how it can be used in view / composite component:

<mycomp:custom name="test11">
    <myval:uniqueValidator items="#{model.values}" for="validator"/>
</mycomp:custom>

当然要在自定义组件中使用验证器，我必须定义editableValueHolder并使用insertChildren注入/粘贴它(请参阅我的问题).

Of course to use validator in custom component I had to define editableValueHolder and inject/paste it using insertChildren (see my question).

这篇关于带有定制组件属性的验证器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！