requiredstring validator
Description
RequiredStringValidator checks that a String field is non-null and has a length > 0. (i.e. it isn’t “”). The trim parameter
determines whether it will String#trim() the String before performing the length check. If unspecified, the String will be trimmed.
Parameters
fieldName- The field name this validator is validating. Required if using Plain-Validator Syntax otherwise not required.trim- (Optional) Boolean, default true. Trims the field name value before validating.trimExpression- (Optional) String. Specifies the trim param as an OGNL expression.
Examples
<validators>
<!-- Plain-Validator Syntax -->
<validator type="requiredstring">
<param name="fieldName">username</param>
<param name="trim">true</param>
<message>username is required</message>
</validator>
<!-- Field-Validator Syntax -->
<field name="username">
<field-validator type="requiredstring">
<param name="trim">true</param>
<message>username is required</message>
</field-validator>
</field>
<!-- Field-Validator Syntax with expression -->
<field name="username">
<field-validator type="requiredstring">
<param name="trimExpression">${trimValue}</param> <!-- will be evaluated as: boolean getTrimValue() -->
<message>username is required</message>
</field-validator>
</field>
</validators>