Databases
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PO
 

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    <p>I would attach your own custom JSF validator to the red <code>&lt;h:inputText/&gt;</code></p> <pre><code>&lt;h:inputText value="#{var.red}" style="width:25px; text-align:right" maxlength="3"&gt; &lt;f:validator validatorId="rowValidator"/&gt; &lt;/inputText&gt; </code></pre> <p>Implement a JSF validator (since you're using Seam you can use the @Validator annotation).</p> <pre><code>@Validator public class RowValidator implements javax.faces.validator.Validator { public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException { &lt;snip/&gt; } } </code></pre> <p>The key here is the UIComponent object passed to the <code>validate()</code> method. This is the <code>&lt;h:inputText/&gt;</code> you've bound the validator to. From here you can call <code>getParent()</code> to get the <code>&lt;h:inputText/&gt;</code> parent (<code>&lt;h:panelGrid/&gt;</code>). You can now enumerate the <code>&lt;h:panelGrid/&gt;</code> children objects to find the yellow <code>&lt;h:inputText/&gt;</code>, retrieve the value passed in to it and compare with the <code>value</code> parameter passed to the <code>validate()</code> method.</p> <p>If yellow is less than red you can do the following in your <code>validate()</code> method:</p> <pre><code>FacesMessage message = new FacesMessage(); message.setDetail("Yellow must be greater than red"); message.setSummary("Yellow must be greater than red"); message.setSeverity(FacesMessage.SEVERITY_ERROR); throw new ValidatorException(message); </code></pre>
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    1. POHow to invalidate a field in seam?
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    1. COGreat idea, I'll try that, Thanks!
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      1. USJason Millikan
    2. COThis works great! It feels like hack going through the parent to get to the sibling controls, but it works simply enough to be useful. Thanks again!
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      1. USJason Millikan
    3. COJust be aware of the tight coupling between the markup and the validator. If the mark up changes, it may break the validator. :)
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      1. USDrew
 

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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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