Chapter 4 example 1

JayinOC · November 18th, 2003, 03:22 PM

What is up with this one? Did the author just figure he would leave out all the closing curly brackets without mentioning it? Not a cool thing to do to a beginner. (page 121).

Imar · November 18th, 2003, 04:43 PM

Hi there,

Would you mind posting the code of the example here? Maybe it's not an error; the curly brackets are not always required......

Imar

---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.

JayinOC · November 19th, 2003, 12:34 PM

Here's the code that I typed from the book. Heck, maybe I had a type-o and it would have worked without the curly brackets. It's just when I downloaded the code from the site it looked totally different than what was in the book. I've already moved past this anyway so don't bother spending much time on it BUT I appreciate the response and help. THANKS !!

<HTML>
<HEAD>
<SCRIPT LANGUAGE="JavaScript" type="text/javascript">

</script>
<head>

<body>
<SCRIPT LANGUAGE="JavaScript" type="text/javascript">

</SCRIPT>
</BODY>
</HTML>

Imar · November 19th, 2003, 01:39 PM

Hi Jay (??),

Well, indeed there should have been some curly brackets in this example. I don't think the author left them out intentionally. It's not easy to keep the book 100% in sync with the code downloads, as lots of people deal with the book (copy editors, DTP guys, proof readers etc). Something has been mixed up somewhere.

Anyway, this is a known issue. If you look at the errata section (found here), you'll find the corrected example:

Code:

<html>
<head>
 <script language="JavaScript" type="text/javascript">
 <!--
  function checkCharType(charToCheck){
   var returnValue = "O"
   var charCode = charToCheck.charCodeAt(0);
    if (charCode >= "A".charCodeAt(0) & charCode <= "Z".charCodeAt(0)){
     returnValue = "U";
    }else if (charCode >= "a".charCodeAt(0) & charCode <= "z".charCodeAt(0)){
     returnValue = "L";
    }else if (charCode >= "0".charCodeAt(0) & charCode <= "9".charCodeAt(0)){
     returnValue = "N";
    }
    return returnValue;
  }
 //-->
 </script>
</head>

<body>
 <script language="JavaScript" type="text/javascript">
 <!--
  var myString = prompt("Enter some text!", "Hello World!");
  switch (checkCharType(myString)){
   case "U":
    document.write("First character was upper case.");
    break;
   case "L":
    document.write("First character was lower case.");
    break;
   case "N":
    document.write("First character was a number.");
    break;
   default:
    document.write("First character was not a character or a number.");
  }
 //-->
 </script>
</body>
</html>

HtH,

Imar

---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.