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Execute a script when a user is pressing a key in HTML?

Use the onkeydown attribute. The onkeydown attribute triggers when the user is pressing a key.

Example

You can try to run the following code to execute a script on pressing a key −

<!DOCTYPE html>
<html>
   <body>
      <p>Press a key inside the textbox.</p>
      <input type = "text" onkeydown = "display()">
      <script>
         function display() {
            alert("You pressed a key!");
         }
      </script>
   </body>
</html>