View Categories

JavaScript Validation API

1 min read

Constraint Validation DOM Methods #

Property Description
checkValidity() Returns true if an input element contains valid data.
setCustomValidity() Sets the validationMessage property of an input element.

If an input field contains invalid data, display a message:

The checkValidity() Method #

<input id="id1" type="number" min="100" max="300" required> <button onclick="myFunction()">OK</button> <p id="demo"></p> <script> function myFunction() { var inpObj = document.getElementById("id1"); if (!inpObj.checkValidity()) { document.getElementById("demo").innerHTML = inpObj.validationMessage; } } </script>

Constraint Validation DOM Properties #

Property Description
validity Contains boolean properties related to the validity of an input element.
validationMessage Contains the message a browser will display when the validity is false.
willValidate Indicates if an input element will be validated.

 
 
 
 
 
 
 
 

Validity Properties #

The validity property of an input element contains a number of properties related to the validity of data:

Property Description
customError Set to true, if a custom validity message is set.
patternMismatch Set to true, if an element’s value does not match its pattern attribute.
rangeOverflow Set to true, if an element’s value is greater than its max attribute.
rangeUnderflow Set to true, if an element’s value is less than its min attribute.
stepMismatch Set to true, if an element’s value is invalid per its step attribute.
tooLong Set to true, if an element’s value exceeds its maxLength attribute.
typeMismatch Set to true, if an element’s value is invalid per its type attribute.
valueMissing Set to true, if an element (with a required attribute) has no value.
valid Set to true, if an element’s value is valid.

Examples #

If the number in an input field is greater than 100 (the input’s max attribute), display a message:

The rangeOverflow Property #

<input id="id1" type="number" max="100"> <button onclick="myFunction()">OK</button> <p id="demo"></p> <script> function myFunction() { var txt = ""; if (document.getElementById("id1").validity.rangeOverflow) { txt = "Value too large"; } document.getElementById("demo").innerHTML = txt; } </script>

If the number in an input field is less than 100 (the input’s min attribute), display a message:

The rangeUnderflow Property #

<input id="id1" type="number" min="100"> <button onclick="myFunction()">OK</button> <p id="demo"></p> <script> function myFunction() { var txt = ""; if (document.getElementById("id1").validity.rangeUnderflow) { txt = "Value too small"; } document.getElementById("demo").innerHTML = txt; } </script>

Powered by BetterDocs

Leave a Reply