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<!DOCTYPE html>
<html>
<head>
<script>
function validateForm() {
  var x = document.forms["myForm"]["fname"].value;
  if (x == "" || x == null) {
    alert("Name must be filled out");
    return false;
  }
}
</script>
</head>
<body>
​
<h2>JavaScript validation for empty input field</h2>
<p>Try to submit the form without entering any text.</p>
​
<form name="myForm" action="https://www.w3schools.com/action_page.php" onsubmit="return validateForm()" method="post" required>
  Name: <input type="text" name="fname">
  <input type="submit" value="Submit">
</form>
​
</body>
​
<!-- Mirrored from www.w3schools.com/howto/tryit.asp?filename=tryhow_js_validation_empty_input by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:38:49 GMT -->
</html>
​
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