How do I prompt for input with a popup dialog in JavaScript?

Created May 4, 2012

Jorge Jordão

Use the prompt(message,inputDefault) window method. It returns the value entered by the user, or null if he pressed cancel.


  <HTML>
    <HEAD>
      <SCRIPT LANGUAGE="JavaScript">
        var value = prompt("Enter a value:","");
        if (value != null) {
          alert("You entered " + value);
        }
        else {
          alert("You canceled!");
        }
      </SCRIPT>
    </HEAD>
  </HTML>