jsf一次验证两个字段 [英] jsf validate two fields in one time

问题描述

我可以使用一个验证器来验证两个相互依赖的字段吗?

can I validate two interdependent fields in with one validator?

     <h:form>
            <h:inputText value="#{logRegBean.person.name}" >
                <f:validator validatorId="loginCorrectValidator" />
            </h:inputText>
            <h:inputSecret value="#{logRegBean.person.password}" />
            <h:commandButton action="#{logRegBean.login}" />
        </h:form>

我想在数据库中搜索该用户，如果有该用户，我将测试密码(在db中和输入的密码)是否匹配.但是，如何才能甚至在一个验证器中访问密码字段呢?我试图通过createValueExpression()在另一个字段中评估值，但是由于我总是得到空字符串，因此我似乎无法访问该时间值.

I want to search for the user in the DB and if there is the user, I'll test if the passwords(in db and inputted) match. But how can I access even the password field in one validator? I tried to evaluate the value int the other field via createValueExpression(), but it looks like I can't access the value in that time since I always get empty strings.

推荐答案

最好的方法是抓住另一个validate()方法中的UIComponentBase.html#findComponent-java.lang.String-"rel =" noreferrer> UIViewRoot#findComponent() ，然后通过 UIInput#getValue() (当它出现在当前组件的之前且已被验证).

Best what you can do is to grab the other UIInput component by UIViewRoot#findComponent() inside the validate() method and then determine the submitted value by either UIInput#getSubmittedValue() (when it occurs after the currently validated component in the component tree) or UIInput#getValue() (when it occurs before the current component and thus is already validated).

例如

public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
    UIInput otherInput = (UIInput) context.getViewRoot().findComponent("clientId");
    String otherValue = (String) otherInput.getSubmittedValue();
    // ...
}

另请参见:

• ​​ JSF不支持跨域验证，有解决方法吗?

See also:

• JSF doesn't support cross-field validation, is there a workaround?

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