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BOOK: Beginning JavaScript
This is the forum to discuss the Wrox book Beginning JavaScript by Paul Wilton; ISBN: 9780764544057
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Old July 22nd, 2004, 10:34 AM
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Default So lost - HELP -

Hello
I am lost.
When I try to view some website code I noticed there is no body html but just this javascript tag. Can Javascript be used purely to dynamically generate the entire body content or is this a mechanism to hide the source code?
Isn't it more efficient to use ASP.NET?

Am I totally off course? What does this mean? I can't get any answers in the book I got.

Thanks.


<script language="javascript1.1">
<!--
var cmJv="1.1";
//-->
</script>
<script language="javascript1.2">
<!--
var cmJv="1.2";
//-->
</script>
<script language="javascript1.3">
<!--
var cmJv="1.3";
//-->
</script>
<script language="javascript1.4">
<!--
var cmJv="1.4";
//-->
</script>
<script language="javascript1.5">
<!--
var cmJv="1.5";
//-->
</script>
<script language="javascript1.1" src="/coremetrics/v31/techprops.js"></script>

<script language="javascript1.1">
<!--


    cmCreatePageviewTag("home.cfm", "back-end", "", "", "0", "0", "1");

// -->
</script>



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Old July 22nd, 2004, 11:06 AM
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Default

JavaScript can be used to dynamically generate the entire body. However, anyone that knows how external .js files work can as good as view the source code, so this is not a method to hide any login information, etc.

The code you have posted seems to be a JavaScript Version Sniffer, which detects which version of JavaScript the browser supports. So, if the browser's max JavaScript level is 1.4, it won't recongnize the language "javascript1.5" and will therefore not execute the code in that tag. So the variable cmJv will equal "1.4", giving you the version.

It is usually better to generate content with a server language like ASP(.NET) because 1) it is commonly faster, 2) the client cannot view any ASP information, and 3) not all browsers have JavaScript enabled, so it would only work on whoever has it enabled.

Hope this clears things up.

Snib

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