JavaScript directive

Nope. I don't know of any programming language that actually defines variables.

I don't understand this statement. Could you explain?

As I understand VB is an interpreted language. May be same goes with VBScript and JavaScript which I think do not go through the preprocessor like C and C++ go through.

I need something like "#ifdefined" or "#ifndef"

Let me try to explain my problem a bit.

I have an entity called "Name"

This entity could be defined out of javascript. If it is defined out of javascript I do not need to define it in my javascript. But if it is not defined outside I need to define it in my javascript. Something along the line:

if(!Name)
{
var Name = "foo";
}

However this doesn't work

I also tried the following:

if(Name == undefined)
{
var Name = "foo";
}

This too doesn't work

what a tough question.
can u tell clearly to me an example of the case when will a variable have been declared outside of the javascript.
or do u mean..
if there are a variable XXX has been declared in VBSCRIPT... then in the same page, u want to use the same variable XXX in javascript, but firstly u want to chek whether it has been declared before ... ?

I am actually not using JavaScript but a customized JavaScript which is called ESP specifically developed by the Company whose software I use. ESP works much more like JavaScript.

My ESP page interfaces with the php page.

If the ESP page is called through the php page everything is OK but when ESP page is directly called the particular php page variable is is reported as undefined variable.

I needed a mechanism to detected if the particular variable is defined or not.

The variable will be defined if called through php page but not when called directly.

I have the solution to the problem:

I use the following code which might relate to JavaScript but maybe only to ESP

<%

if(global.Name = undefined)
{
var Name = "";
}

%>

Don't know if global is ESP specific or it belongs to JavaScript.

By me I am actually not using JavaScript but a customized JavaScript which is called ESP specifically developed by the Company whose software I use. ESP works much more like JavaScript.

I have already stated this that this ESP I am talking about is not widely used but is specific to "Mbedthis" whose web server I am using.

Here is a link to its documentation on variables;

global (http://www.mbedthis.com/products/appWeb/doc/common/ejs/standard.html)