JavaScript/jQuery Validator Validation Rules
AsyncRule
A custom validation rule that is checked asynchronously. Use async rules for server-side validation.
To specify the async rule, set the type to "async" and declare the validationCallback function.
You can also set a custom message, specify whether empty values are valid, and whether the rule should be re-evaluated, even if the target value is the same.
Validation rules are checked in the following order: All the synchronous rules are checked in the same order as in the validationRules array. Then, all the async rules are checked simultaneously.
See Also
CompareRule
A validation rule that demands that a validated editor has a value that is equal to a specified expression.
To specify the expression that the validated field must match, set the rule's comparisonTarget configuration property. Assign a function to this property. The validated value will be compared to the function's return value. The comparison will be performed by using the operator that is set for the comparisonType property.
See Also
CustomRule
To specify the custom rule, set the type to "custom" and declare the validationCallback function.
You can also set a custom message, specify whether empty values are valid, and whether the rule should be re-evaluated, even if the target value is the same.
See Also
EmailRule
DevExtreme components use the following Email pattern:
pattern: /^[\d\w._-]+@[\d\w._-]+\.[\w]+$/i
See Also
PatternRule
To specify the regular expression that the validated field must match, set the rule's pattern configuration property.
See Also
RangeRule
A validation rule that demands the target value be within the specified value range (including the range's end points).
To specify the range that the validated value must match, set the rule's min and max configuration properties. Note that the specified range can be on a date-time or numeric scale. To validate a value against a string length, use the stringLength rule.
See Also
RequiredRule
Use this rule type to ensure the target editor value is specified. The rule will be broken in the following cases.
- If the validated value is null, false, or undefined.
- If the specified value has a type that is not expected for the target field (e.g., a string for the DateBox UI component).
See Also
StringLengthRule
A validation rule that demands the target value length be within the specified value range (including the range's end points).