Javascript DOM oninvalid Event via addEventListener() method

Introduction

In JavaScript, using the addEventListener() method:

If you click submit, without filling out the text field, an alert message will occur. 

object.addEventListener("invalid",
       myScript);

View in separate window 

<!DOCTYPE html>
<html>
<body>

<form action="/action_page.php" method="get">
  Name: <input type="text" id="myInput" name="fname" required>
  <input type="submit" value="Submit">
</form>/*from  ww w . ja  va2s  .com*/
<p id="demo"></p>
<script>
document.getElementById("myInput").addEventListener("invalid", myFunction);

function myFunction() {
  document.getElementById("demo").innerHTML = "You must fill out the form!";
}
</script>

</body>
</html>
Bubbles: No
Cancelable: Yes
Event type: Event
Supported HTML tags: <input>



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