Skip to main content
Use the arc:if keyword to evaluate expressions that can contain items, attributes, and values. The scope of the keyword is executed if the specified expression evaluates to true.

​
Parameters

  • exp: The expression to evaluate. You can make string, date, and numeric comparisons.
  • attr: The name of the attribute to compare the value of. The value of an attribute can be checked for a matching value or for the values null or notnull.
  • value: The value to compare with the value of the attribute specified by attr.
  • item: The item that contains the attribute being compared.
  • operator: The name of the operator to compare the operands specified by attr and value. Allowed values: null, notnull, hasvalue, equals, equalsignorecase, notequals, lessthan, and greaterthan. The default is notnull.
  • action: The action to perform if the expression evaluates to true. Allowed values: break or continue.

​
Control Attributes

None

​
Examples

Evaluate a simple comparison of two values: 
<arc:if exp="[attr] == 10">
Evaluate the equality of a given value and the value of a given attribute: 
<arc:set attr="attr1" value="value1"/>
<arc:set attr="attr2" value="value2"/>
<arc:if attr="attr1" value="[attr2]" operator="notequals"> <!-- Evaluates to true -->
<arc:else>
False
</arc:else>
True
</arc:if>
Evaluate whether an attribute exists: 
<arc:set attr="exists" value="true"/>
<arc:if attr="exists"> <!-- Evaluates to true -->
[exists]
</arc:if>

​
See Also

  • arc:exists: Check that an attribute has a value in the specified item.
  • arc:equals: Create a block that is executed when equality is met.