JSTL Components
The JSTL components are defined in the following namespace:
xmlns:c="http://java.sun.com/jstl/core"
The facelet components are implemented by the ASF.Views.Nodes.Facelets
package which defines the pre-defined tags for composing a view. Nodes of
this package are instantiated when the facelet XML tag is found when reading
the XHTML view description.
c:choose
This tag associates a parameter name-value pair with the nearest parent UIComponent. A UIComponent is created to represent this name-value pair, and stored as a child of the parent component; what effect this has depends upon the renderer of that parent component.
Unless otherwise specified, all attributes accept static values or EL expressions.
Attributes
No attributes are defined.
Example
<c:choose>
<c:when test="#{not empty compute.radius}">
Radius is not empty: #{compute.radius}.
</c:when>
<c:when test="#{empty compute.radius}">
Radius is empty
</c:when>
</c:choose>
c:if
Simple conditional tag, which evalutes its body if the supplied condition is true and optionally exposes a Boolean scripting variable representing the evaluation of this condition.
Attributes
Name | Type | Description |
---|---|---|
test | Boolean | The test condition that determines whether or not the body content should be processed. |
var | String | Name of the exported scoped variable for the resulting value of the test condition. The type of the scoped variable is Boolean. |
Example
<c:if test="#{not empty compute.radius}">
Radius is not empty: #{compute.radius}.
</c:if>
<c:if test="#{empty compute.radius}">
Radius is empty
</c:if>
c:otherwise
Subtag of choose
that follows when
tags and runs only if all of
the prior conditions evaluated to 'false'.
Attributes
This tag has no attribute.
Example
<c:choose>
<c:when test="#{not empty compute.radius}">
Radius is not empty: #{compute.radius}.
</c:when>
<c:otherwise>
Radius is empty
</c:otherwise>
</c:choose>
c:set
Sets the result of an expression evaluation based on the value of the attributes.
Attributes
Name | Type | Description |
---|---|---|
var | String | Name of the variable. |
value | ValueExpression | Expression to be evaluated. |
Example
<c:set var="name" value="23"/>
#{name}
<c:set var="name" value="#{23 + 1}"/>
#{name}
c:when
Subtag of choose
that includes its body if its condition evalutes to 'true'.
Attributes
Name | Type | Description |
---|---|---|
test | Boolean | The test condition that determines whether or not the body content should be processed. |
Example
<c:choose>
<c:when test="#{not empty compute.radius}">
Radius is not empty: #{compute.radius}.
</c:when>
<c:when test="#{empty compute.radius}">
Radius is empty
</c:when>
</c:choose>
The ASF.Views.Nodes.Core package defines some pre-defined core tag nodes which are mapped in the following namespaces:
xmlns:c="http://java.sun.com/jstl/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:fn="http://java.sun.com/jsp/jstl/functions"