<field name="myField"> <field-validator type="fieldexpression"> <param name="expression">OGNL expression</param> <message>validation error message</message> </field-validator> </field>
<validator type="fieldexpression"> <param name="fieldName">myField</param> <param name="expression">OGNL expression</param> <message>validation error message</message> </validator>
Parameter name | Description |
expression | The OGNL expression to be evaluated (to a boolean value). |
<field name="sum"> <field-validator type="fieldexpression"> <param name="expression">sum eq (number1 + number2)</param> <message>The sum you entered is incorrect!</message> </field-validator> </field>
<validator type="fieldexpression"> <param name="fieldName">sum</param> <param name="expression">sum eq (number1 + number2)</param> <message>The sum you entered is incorrect!</message> </validator>
sum eq (number1 + number2)
That’s equivalent to:sum = (number1 + number2)
Some OGNL comparison operators we can use are:@FieldExpressionValidator (param1 = "param 1 value", param2 = "param 2 value", ...)
Parameter name | Required | Default value | Description |
message | Yes | validation error message. | |
key | No | i18n key for validation error message. | |
messageParams | No | Additional parameters to customize the message. | |
fieldName | No | Specifies field name in case this validator type is plain-validator. | |
shortCircuit | No | false | Whether this validator is short circuit. |
expression | Yes | The OGNL expression to be evaluated (to a boolean value). |
@FieldExpressionValidator( expression = "sum eq (number1 + number2)", message = "The sum you entered is incorrect!" )
@FieldExpressionValidator( fieldName = "sum", expression = "sum eq (number1 + number2)", message = "The sum you entered is incorrect!" ) public String execute() { return SUCCESS; }
@FieldExpressionValidator( fieldName = "sum", expression = "sum eq (number1 + number2)", key = "form.validation.sum", message = "(default message if the i18n key not found)" )