Question
How client side validation is enabled on a JSP form?
Answers
In order to enable client side validation in Struts, first we need to enable validator plug-in in struts-config.xml file. This is done by adding following configuration entries in this file:
XHTML
<!--  Validator plugin -->
<plug-in className="org.apache.struts.validator.ValidatorPlugIn">
<set-property
property="pathnames"
value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml"/>
</plug-in> 123456
<!--  Validator plugin --><plug-in className="org.apache.struts.validator.ValidatorPlugIn"><set-propertyproperty="pathnames"value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml"/></plug-in>

 
Then Validation rules are defined in validation.xml file. If a form contains email field and we want to enable client side validation for this field, following code is added in validation.xml file:
XHTML
<form name="testForm">
<field  property="email"
depends="required">
<arg key="testForm.email"/>
</field>
</form> 123456
<form name="testForm"><field  property="email"depends="required"><arg key="testForm.email"/></field></form>

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