THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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The example code for this tutorial, form_xml_validation, is available for checkout at https://svngithub.apache.org/repos/asf/struts/sandbox/trunk/struts2examples/ |
Introduction
In this tutorial we'll cover how to validate a user's input in form fields using Struts 2's XML validation methodology. In the Form Validation tutorial we discussed validating a user's input using the validate method in the Action class. Using a separate XML validation file gives you the ability to use validators built-in to the Struts 2 framework.
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In the XML validation file (for this example that is EditAction-validation.xml), is this XML:
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<!DOCTYPE validators PUBLIC "-//OpenSymphonyApache GroupStruts//XWork Validator 1.0.23//EN" "http://wwwstruts.opensymphonyapache.comorg/xworkdtds/xwork-validator-1.0.23.dtd"> <validators> <validator type="requiredstring"> <param name="fieldname">personBean.firstName</param> <message>First name is required.</message> </validator> </validators> |
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<validator type="requiredstring">
<param name="fieldname">personBean.email</param>
<message>Email address is required.</message>
</validator>
<validator type="email">
<param name="fieldname">personBean.email</param>
<message>Email address not valid.</message>
</validator>
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<validator type="requiredstring"> <param name="fieldname">personBean.phoneNumber</param> <message>Phone number is required.</message> </validator> <validator type="regex"> <param name="fieldname">personBean.phoneNumber</param> <param name="expressionregex"><![CDATA[\d{3}-\d{3}-\d{4}]]></param> <message>Phone number must be entered as 999-999-9999.</message> </validator> |
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<validator type="fieldexpression">
<param name="fieldname">personBean.carModels</param>
<param name="expression"><![CDATA[personBean.carModels.length > 0]]></param>
<message>You must select at least one car model.</message>
</validator>
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