NOT condition in Tridion Dreamweaver Template (DWT)

Question

This is fairly simple:

<!-- TemplateBeginIf cond="Component.Key=='TrackingTag'" -->
 . . .
<!-- TemplateEndIf -->

However, I'm stuck with reverse condition. For example in C# we usually do:

if(!String.IsNullOrEmpty()) // 

So I want the Equivalent in DWT :

This was tried but Not working. condition !(Component.Key=='TrackingTag') always comes true.

<!-- TemplateBeginIf cond="!(Component.Key=='TrackingTag')" -->

Answer 1

Try this way

<!-- TemplateBeginIf cond="Component.Key != 'TrackingTag'" -->

Answer 2

Siva answered how you check for inequality, but I'll chime in how to check for existence.

The equivalent of String.IsNullOrEmpty(Component.Key) would probably be

<!-- TemplateBeginIf cond="Component.Key" -->

This condition will only pass if Component.Key exists and it has a value.

People often use that construct to ensure that a field exists/has a value, before they write the wrapper tags:

<!-- TemplateBeginIf cond="Component.Subtitle" -->
  <h3>${Component.Subtitle}</h3>
<!-- TemplateEndIf -->

Answer 3

Do not need to use "==" for string operand, try like below,

<!-- TemplateBeginIf cond="Component.Key='TrackingTag'" -->
 . . .
<!-- TemplateEndIf -->