如何验证是否输入了多个输入字段中的至少一个? [英] How to validate if at least one of multiple input fields is entered?

问题描述

我有一个包含3个字段的表单，然后提交按钮.单击按钮时，如果在3个字段中均未输入任何内容，则抛出验证消息.如果输入了3个字段中的任何一个，则将处理数据并使用数据表在同一页面中显示结果.我可以为一个字段抛出验证消息，但不能为两个或更多字段抛出验证消息.这是我的代码.同样，如果我需要传递一个长值，并验证我该怎么做，因为长值不能被验证为isEmpty()或isNull().

I have a form with 3 fields, and submit button. when button clicked, if none is entered in 3 fields, throw validation message. If any one of the 3 fields are entered process the data and show results back in same page using data table. I am able to throw validation message for one field, but not for 2 fields or more.Here is my code. As well, if I have a long value that I need to pass, and validate how can i do that, since long value can not be validated as isEmpty() or isNull().

这是我的代码，我想将其用于多个字段以及具有长值的字段得到验证.

Here is my code, I want to use it with multiple fields and with fields that have long values get validated.

<h:inputText id="userName" value="#{user.userName}" required="true"
    requiredMessage="Please enter username" />

<h:inputText id="empId" value="#{user.empId}" required="true"
    requiredMessage="Please enter Employee Id" />

<h:inputText id="acctNm" value="#{user.acctNm}" required="true" 
    requiredMessage="Please enter Employee Id" />

推荐答案

只需让每个字段的required属性检查其他字段的提交值是否存在.提交的值可在客户端客户ID作为键的参数映射#{param}中获得.

Just let the required attribute of each field check the presence of the submitted value of the other fields. The submitted value is available in the parameter map #{param} by the client ID as key.

这是一个开球示例:

<h:form id="form">
    <h:inputText id="field1" ... required="#{empty param['form:field2'] and empty param['form:field3']}" />
    <h:inputText id="field2" ... required="#{empty param['form:field1'] and empty param['form:field3']}" />
    <h:inputText id="field3" ... required="#{empty param['form:field1'] and empty param['form:field2']}" />
</h:form>

随着字段数量的增加，它只会变得更加丑陋.

It gets only more ugly as the amount of fields grows.

或者，您可以使用 OmniFaces

Alternatively, you can use OmniFaces <o:validateOneOrMore>:

<h:form id="form">
    <h:inputText id="field1" ... />
    <h:inputText id="field2" ... />
    <h:inputText id="field3" ... />

    <o:validateOneOrMore id="oneOrMore" components="field1 field2 field3" />
    <h:message for="oneOrMore" />
</h:form>

请注意，以动作方法执行验证是错误的设计.为此，您应该使用标准的JSF验证工具，例如requiered，validator，<f:validator>和/或<f:validateXxx>.

Please note that performing validation in action method is bad design. You should use the standard JSF validation facilities for this such as requiered, validator, <f:validator> and/or <f:validateXxx>.

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