Apache Struts 2 Documentation > Home > Guides > Core Developers Guide > Validation > required validator
Added by tm_jee, last edited by Ted Husted on Sep 03, 2006  (view change)

Description

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RequiredFieldValidator checks if the specified field is not null.

Parameters

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  • fieldName - field name if plain-validator syntax is used, not needed if field-validator syntax is used

Examples

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<validators>

        <!-- Plain Validator Syntax -->
        <validator type="required">
            <param name="fieldName">username</param>
            <message>username must not be null</message>
        </validator>


        <!-- Field Validator Syntax -->
        <field name="username">
            <field-validator type="required">
            	   <message>username must not be null</message>
            </field-validator>
        </field>

    </validators>