ZPT-JS reference - Attributes - TALCondition

Syntax

argument ::= expression

Description

The data-condition statement includes the statement element in the template only if the condition is met, and omits it otherwise. If its expression evaluates to a true value, then normal processing of the element continues, otherwise the statement element is immediately removed from the template.

If an expression evaluates to any of the next:

the expression evaluates to false. Otherwise the expression evaluates to true.

Note: extracted from Zope Page Templates Reference.

Differences with ZPT

None.

Examples

Test a variable before inserting it (the first example tests for existence and truth, while the second only tests for existence): 

                    <p datat-condition="myObject/message"
                       data-content="myObject/message">
                       Message goes here
                    </p>

                    <p datat-condition="exists: myObject/message"
                       data-content="myObject/message">
                       Message goes here
                    </p>

Test for alternate conditions: 

                <div data-repeat="item [1:10]">
                    <span data-replace="item-repeat/index()">1</span>
                    is 
                    <span data-condition="item-repeat/even()">even</span>
                    <span data-condition="item-repeat/odd()">odd</span>
                </div>

Test for alternate conditions in action:

1 is even odd

Note: extracted from Zope Page Templates Reference.