HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>prompt() — cancel</title>
</head>
<body>
  <button type="button" id="askBtn">Enter something</button>
  <pre id="out"></pre>
  <script>
    document.getElementById("askBtn").onclick = function () {
      var userInput = prompt("Enter something:");
      var out = document.getElementById("out");
      if (userInput === null) {
        out.textContent = "User canceled the prompt.";
      } else if (userInput === "") {
        out.textContent = "User clicked OK but left the field empty.";
      } else {
        out.textContent = "User entered: " + userInput;
      }
    };
  </script>
</body>
</html>

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JavaScript prompt() — handle cancel (Try It)