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Jakarta Struts Cookbook
book

Jakarta Struts Cookbook

by Bill Siggelkow
February 2005
Intermediate to advanced content levelIntermediate to advanced
528 pages
12h 53m
English
O'Reilly Media, Inc.
Content preview from Jakarta Struts Cookbook

8.8. Validating Field Equality in Struts 1.2

Problem

You want to validate that two fields on a form have the same value, taking advantage of the new features provided by the Validator in Struts 1.2.

Solution

Use the validwhen rule with a test expression that checks if the validated field is equals the other field. In Example 8-12, the test expression specifies the password2 field (*this*) must equal the password field for the validation to pass.

Example 8-12. Validating field equality with validwhen

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE form-validation PUBLIC
          "-//Apache Software Foundation//DTD Commons Validator Rules 
          Configuration 
          "http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd">
<form-validation>
    <formset>
        <form name="RegistrationForm">
            <field property="emailAddress"
                    depends="required,email">
                <arg key="prompt.emailAddress"/>
            </field>
            <field property="password"
                    depends="required">
                <arg key="prompt.password"/>
            </field>
            <field property="password2"
                    depends="required,validwhen">                 
                <arg position="0" key="prompt.password2"/>
                <arg position="1" key="prompt.password"/>
                <msg name="validwhen" key="error.password.match"/>
                <var>
                    <var-name>test</var-name>
                    <var-value>(*this* == password)</var-value>
                </var>
            </field>
        </form>
    </formset>
</form-validation>

Discussion

If you compare this Solution with Recipe 8.7, you can see the same business rule is implemented without requiring a custom Validator rule. The validwhen rule used here accepts a test expression, which it evaluates. ...

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Publisher Resources

ISBN: 059600771XSupplemental ContentErrata Page