java barcode generator example The f:selectItem Tag in Java

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The f:selectItem Tag
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UIComponent class: javaxfacescomponentUISelectItem Component type: javaxfacesSelectItem The selectItem component adds a child UISelectItem component to the closest parent UIComponent
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JavaSer ver Faces Tools and Libraries
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Attributes
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Attribute binding Type ValueBinding (10, 11) or ValueExpression (12, 20) String String String Description A ValueBinding or ValueExpression expression to a backing bean property bound to the component instance for the UIComponent created by this custom action The component identifier of the component A description of the item The boolean flag used to display the item as disabled The default value is false The displayed label of the item The actual (nondisplayed) value of the item The boolean flag that indicates that the itemValue of this tag is to be regarded as a nonselection by the user, which will cause required-validation of the parent selection component to fail The default value is false The value of the component No Required No
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id itemDescription itemDisabled
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itemLabel itemValue noSelectionOption
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No No
value
String
Example Usage
Several f:selectItem components providing select options for an h:selectOneMenu are shown in the following
<h:selectOneMenu id="colorId" required="true" value="#{testManagedBeancolorId}"> <f:selectItem itemLabel="-- Select --" itemValue="0" noSelectionOption="true" /> <f:selectItem itemLabel="Red" itemValue="1" /> <f:selectItem itemLabel="Green" itemValue="2" /> <f:selectItem itemLabel="Blue" itemValue="3" /> </h:selectOneMenu>
The f:selectItems Tag
UIComponent class: javaxfacescomponentUISelectItems Component type: javaxfacesSelectItems The f:selectItems tag locates the closest parent UIComponent, creates a new UISelectItems component, and attaches it as a child of the associated UIComponent The implementation class for this action must meet the requirements shown in the following table
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The Standard JSF Component Library
Attributes
Attribute binding Type ValueBinding (10, 11) or ValueExpression (12, 20) String String boolean String Boolean Description A ValueBinding or ValueExpression expression to a backing bean property bound to the component instance for the UIComponent created by this custom action The component identifier of the component A string value that specifies the description of the item A boolean value that specifies whether or not the value is disabled A string value that specifies the label for the item A boolean value that specifies whether or not the label that is rendered should be escaped, meaning special HTML and XML characters ( < , > , etc) as character entity codes ( < , > , respectively) If true, generated markup is escaped in a manner appropriate for the markup language being rendered The default value is false A string or any primitive wrapper such as Long or Integer that can be implicitly converted to a String Otherwise, if an instance of a custom class is specified, then a converter will need to be specified as a sibling tag A string value that is to be regarded as a nonselection by the user, which will cause required-validation of the parent selection component to fail A value binding expression of source of items May resolve to a Java language Collection, javax facesmodelDataModel, or array, containing any type of object See the following value description An iterator variable name that gets introduced into the EL and represents the current item in the iteration over the value attribute Required No
id itemDescription (20) itemDisabled (20) itemLabel (20) itemLabelEscaped (20)
No No No No No
PART III
itemValue (20)
ValueExpression
noSelectionValue (20)
String
value
ValueExpression
var (20)
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JavaSer ver Faces Tools and Libraries
Example Usage
The following is an example with the f:selectItems value bound to a CountriesMap Map This will display a list of countries
<h:selectOneMenu <f:selectItems value="#{CountriesMap}"/> </h:selectOneMenu>
The following is an example with the f:selectItems value bound to a Collection of Color objects It shows how to use the new attributes introduced in JSF 20
<h:selectOneMenu id="colorId" required="true" value="#{testManagedBeancolorId}"> <f:selectItems value="#{testManagedBeancolors}" var="color" itemValue="#{colorcolorId}" itemLabel="#{colorname}" itemDescription="#{colordescription}" itemDisabled="#{colordisabled}" itemLabelEscaped="true" noSelectionValue="#{testManagedBeancolors[0]}"> </f:selectItems> </h:selectOneMenu>
The Value Attribute Description
Prior to JSF 20, the ValueBinding expression for the value attribute was required be one of the following instances: An individual javaxfacesmodelSelectItem A Java language array of javaxfacesmodelSelectItem A javautilCollection of javaxfacesmodelSelectItem A javautilMap where the keys are converted to Strings and used as labels, and the corresponding values are converted to Strings and used as values for newly created javaxfacesmodelSelectItem instances The instances are created in the order determined by the iterator over the keys provided by the Map As of JSF 20, the ValueBinding expression for the value attribute is no longer exclusively tied to javaxfacesmodelSelectItem but can be any Collection, array, or instance of javax facesmodelDataModel
The f:setPropertyActionListener Tag (12, 20 Only)
The setPropertyActionListener tag registers an ActionListener instance on the UIComponent associated with the closest parent UIComponent custom action This actionListener will cause the value given by the value attribute to be set into the ValueExpression given by the target attribute This is useful for easily placing objects into managed beans or other objects accessible via EL
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