JavaScript Validation API
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> Try it […]