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IF

Processes other tags or displays text based on a logical condition.

Syntax

<IF COND="LOGICAL_EXPRESSION">
   <THEN>
      tags and/or text
   </THEN>
   <ELSE>
      tags and/or text
   </ELSE>
</IF>

Parameters

COND (required)

String comparison of two string values. The operators supported are "=" (values are equivalent) or "!=" (values are not equivalent)".

The following are conditions that Sites provides for use with the IF tag; all these subconditions return either true or false:

IsCatalog	Tests whether this is a table.
IsColumn	Tests for the existence of a column in a list.
IsCounter	Tests for the existence of a counter.
IsElement	Tests for the existence of an element.
IsError	Tests whether the errno is actually an error.
IsList	Tests for the existence of a list.
IsObject	Tests whether the given name is an object table.
IsSessionVariable	Tests for the existence of a session variable.
IsTracked	Determine whether Sites is revision tracking a specified table.
IsTree	Tests whether the given name is a tree table.
IsVariable	Tests for the existence of a variable.

Description

The IF tag processes other tags or displays text based on a logical condition. If the condition is true, the content of the THEN tag is processed. If the condition is false, the content of the ELSE tag is processed. The THEN tag is required as part of an IF tag. The ELSE tag is not required.

Error Numbers

There are no possible errno for this tag.

Example

The following example prints the message Color is red. if the value of Variables.color is red.

<IF COND="Variables.color=red">
   <THEN>
      Color is red.<br/>
   </THEN>
   <ELSE>
      Color is not red.<br/>
   </ELSE>
</IF>

This example tests for the existence of the variable, color. If a variable named color has been set prior to this test, The variable color exists. is displayed.

<IF COND="IsVariable.color=true">
   <THEN>
      The variable color exists.<br/>
   </THEN>
</IF> 

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