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Constraint validation DOM attribute

Validity: Boolean attribute value, which returns whether the input input value is legal

ValidationMessage: browser error message

WillValidate: specifies whether input needs to be validated

Validity attribute

The validity attribute of the input element contains a series of attributes about validity data:

CustomError: set to true, if custom validity information is set.

PatternMismatch: set to true if the value of the element does not match its schema attribute.

RangeOverflow: set to true if the value of the element is greater than the maximum value set.

RangeUnderflow: set to true if the value of the element is less than its minimum value.

StepMismatch: set to true if the value of the element is not set according to the specified step attribute.

TooLong: set to true if the value of the element exceeds the length set by the maxLength attribute.

TypeMismatch: set to true if the value of the element is not the expected matching type.

ValueMissing: set to true if the element (required attribute) has no value.

Valid: set to true if the value of the element is legal.

Case study

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RangeOverflow attribute

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