Getting input from the user

We can use JavaScript's alert command to display information to the user but we also need to be able to read the user's input. We can use the prompt command to do this.

Type this html page into NotePad++:

<html>
  
  <head>
    <title>My second program</title>
  </head>
  <body>
    <script>
      userName = prompt("What is your name", "")
      alert("Hello " + userName + ".")
    </script>
    This text will appear after you close the alert.
  </body>
</html>

Save the file and open it in FireFox.

You should see a box on screen asking for your name. [Getting user input with the prompt() command.]

Enter your name and you should see a welcome message. [Displaying a message with the alert() command.]

This program introduces the concepts of variables , strings and parameters in JavaScript.

Getting input from the user

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March 2011

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