Apache Struts 2 Documentation > Home > Guides > Core Developers Guide > Validation > double validator |
Field Validator that checks if the double specified is within a certain range.
You can specify either minInclusive, maxInclusive, minExclusive and maxExclusive or minInclusiveExpression, maxInclusiveExpression, minExclusiveExpression and maxExclusiveExpression as a OGNL expression, see example below. You can always try to mix params but be aware that such behaviour was not tested.
![]() | Warning Do not use ${minInclusiveExpression}, ${maxInclusiveExpression}, ${minExclusiveExpressionExpression} and ${maxExclusive} as an expression as this will turn into infinitive loop! |
<validators> <!-- Plain Validator Syntax --> <validator type="double"> <param name="fieldName">percentage</param> <param name="minInclusive">20.1</param> <param name="maxInclusive">50.1</param> <message>Age needs to be between ${minInclusive} and ${maxInclusive} (inclusive)</message> </validator> <!-- Field Validator Syntax --> <field name="percentage"> <field-validator type="double"> <param name="minExclusive">0.123</param> <param name="maxExclusive">99.98</param> <message>Percentage needs to be between ${minExclusive} and ${maxExclusive} (exclusive)</message> </field-validator> </field> <!-- Field Validator Syntax with expression --> <field name="percentage"> <field-validator type="double"> <param name="minExclusiveExpression">${minExclusiveValue}</param> <!-- will be evaluated as: Double getMinExclusiveValue() --> <param name="maxExclusiveExpression">${maxExclusiveValue}</param> <!-- will be evaluated as: Double getMaxExclusiveValue() --> <message>Percentage needs to be between ${minExclusive} and ${maxExclusive} (exclusive)</message> </field-validator> </field> </validators>