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<!DOCTYPE html>
<html>
<body>
​
<p>Enter a number and click OK:</p>
​
<input id="id1" type="number" min="100" max="300" required>
<button onclick="myFunction()">OK</button>
​
<p>If the number is less than 100 or greater than 300, an error message will be displayed.</p>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var inpObj = document.getElementById("id1");
  if (!inpObj.checkValidity()) {
    document.getElementById("demo").innerHTML = inpObj.validationMessage;
  } else {
    document.getElementById("demo").innerHTML = "Input OK";
  } 
} 
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_validation_check by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:39:35 GMT -->
</html>
​
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