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POValidate arbitrary objects in JSF?
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  1. POValidate arbitrary objects in JSF?
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    copied!<p>So, you can validate input using JSR-303 annotations on the binding bean property:</p> <pre><code>class Ticket { @MinAge(18) Person person; } class Person { @Min(1) @Max(100) int age; } &lt;p:inputText id="age" value="#{bean.ticket.person.age}" /&gt; </code></pre> <p>Here, the property Person.age is validated (between 1..100) with no problem.</p> <p>The problem is, I want to validate the outer instance (person.age >= 18). But how to make the property <code>bean.ticket.person</code> be known to validation?</p> <p>I want something like:</p> <pre><code>&lt;p:inputText id="age" value="#{bean.ticket.person.age}"&gt; &lt;f:validate value="#{bean.ticket.person}" /&gt; &lt;/p:inputText&gt; </code></pre> <p>Or:</p> <pre><code>&lt;p:inputText id="age" value="#{bean.ticket.person.age}"&gt; &lt;f:validator id="jsr303-validator" value="#{bean.ticket.person}" /&gt; &lt;/p:inputText&gt; </code></pre> <p>The problem is, I can't pass a value to <code>&lt;f:validator /&gt;</code>. I want to add extra properties to the validation process, more then only the inputs appeared on the page.</p> <p><strong>P.S.</strong> This is a simplified example, the real application is:</p> <pre><code>... &lt;p:inputText id="principalLabel" value="${activeACL.principal.label}" readonly="true" /&gt; &lt;p:commandButton value="Choose..." onclick="choosePrincipalDialog.show()" /&gt; ... &lt;p:commandButton value="Save" action="${bean.saveACL}" oncomplete="editACLDialog.hide()" update="index" /&gt; </code></pre> <p>And activeACL of type ACL_DTO:</p> <pre><code>class ACL_DTO { ... @IdRequired Principal_DTO principal; } </code></pre> <p>Here, <code>choosePrincipalDialog</code>'s actionListener will implicit change the <code>${activeACL.principal.id}</code>, which is initially <code>null</code>. IdRequired is a custom constraint which constrains an object's id member property is not null or -1.</p> <p>Though, I can change to use @NotNull on the id property, and add a hidden-input to enable the validation on the id:</p> <pre><code>class Principal_DTO { ... @NotNull @Min(0) Long id; } ... &lt;h:inputHidden id="principalId" value="${activeACL.principal.id}" /&gt; &lt;h:inputText id="principalLabel" ... </code></pre> <p>But, in this way I can't reuse the validation messages any more. Give message like "This string should not be null", "This value should not be -1" to the user seems meaningless.</p>
 

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