simple example not working or is there something missing?

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  • jasonchan
    New Member
    • Oct 2006
    • 16
    #1

    simple example not working or is there something missing?

    here is a code from a book.

    <html>
    <body>

    <script type="text/javascript">

    /* Paramater-Passing Basics
    A function's basic syntax:

    function functionname(pa rameter-list)
    {
    statements
    }

    */

    function message(name)
    {
    if (name != "")
    alert("Hello there "+name);
    else
    alert("Don't be shy");
    }

    message("Jason" );
    message();

    </script>

    </body>
    </html>



    basically, the empty function --> message(); is supposed to prompt the alert message "Don't be shy". Instead, it says hello there undefined.

    based on the book, it says that calling the function either message(""); or without the paramater, message(); should prompt this message. it works only for message(""); and not without the parameter. ... whats goin on here??
    Tags: None
    • AricC
      Recognized Expert Top Contributor
      • Oct 2006
      • 1885
      #2
      The function message() expects the parameter name therefore when you don't pass it a value the message() is undefined. Add message("Bob") to the second call and you will see what I mean. If you pass the function an empty string message("") that is what it will return.

      HTH,
      Aric

        Comment

        • jasonchan
          New Member
          • Oct 2006
          • 16
          #3
          Originally posted by AricC
          The function message() expects the parameter name therefore when you don't pass it a value the message() is undefined. Add message("Bob") to the second call and you will see what I mean. If you pass the function an empty string message("") that is what it will return.

          HTH,
          Aric
          yea thats what i thought. but the author says that the function message() SHOULD prompt the same thing as message(""). That's the confusion that I have.

            Comment

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