THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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MyFaces
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Commons
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Converters
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contains
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some
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useful
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converters
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not
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provided
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by
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the
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spec,
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and
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a
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base
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class
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for
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create
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custom
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converters
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using
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myfaces-builder-plugin.
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This
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base
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class
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(
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org.apache.myfaces.commons.converter.ConverterBase
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)
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allow
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use
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ValueExpressions
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and
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in
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2.0
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version
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provides
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an
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implementation
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of
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StateHelper.
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This
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is
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useful
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in
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cases
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where
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parameters
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for
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the
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converter
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are
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bound
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to
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ValueExpression
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instance
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that
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are
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evaluated
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at
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runtime.
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By
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default,
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converter
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parameters
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are
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evaluated
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on
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build
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time
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(the
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first
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time
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the
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view
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is
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built),
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so
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they
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cannot
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change
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over
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the
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time
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(further
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web
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postback
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requests).
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To
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understand
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this,
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take
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a
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look
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at
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this
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example:
| Code Block | ||||
|---|---|---|---|---|
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{code:xml} <h:form id="form1"> <h:messages showDetail="false" showSummary="true" ></h:messages> <h:panelGrid columns="3"> <h:outputLabel for="type" value="Insert a type" /> <h:selectOneMenu id="type" immediate="true" value="#{numberBean.type}" > <f:selectItem itemLabel="number" itemValue="number"/> <f:selectItem itemLabel="currency" itemValue="currency"/> <f:selectItem itemLabel="percent" itemValue="percent"/> </h:selectOneMenu> <h:message for="type" styleClass="error" /> <h:outputLabel for="number1" value="Insert a number" /> <h:inputText id="number1" value="#{numberBean.numberMap['number1']}" required="true"> <mcc:convertNumber destType="java.lang.Double" type="#{mc:findComponent('form1:type').value}"/> </h:inputText> <h:message for="number1" styleClass="error" /> <h:commandButton id="validateButton" value="#{example_messages['button_submit']}" action="#{numberBean.submit}" /> </h:panelGrid> </h:form> {code} |
It
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is
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a
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<h:
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selectOneMenu> that
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allows
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you
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to
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choose
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a
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type
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that
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is
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then
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read
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by
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a
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converter.
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This
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can't
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work
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with
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<f:
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convertNumber>,
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because
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the
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ValueExpression
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on
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type
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is
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evaluated
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at
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build
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time.
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But
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in
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this
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case,
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<mcc:
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convertNumber> evaluate
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them
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each
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time
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the
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conversion
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occur.
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Note
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the
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immediate="true"
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in
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<h:
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selectOneMenu> makes
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the
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value
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of
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the
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component
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be
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evaluated
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before
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the
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conversion
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over
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the
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input
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text.
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Also,
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in
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this
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project
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you
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can
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found:
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- <mcc:convertBoolean> : Simple true/false
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- converter
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- with
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- alternate
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- representations
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- of
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- true
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- false
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- (yes/no),
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- (1/0),
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- and
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- (way/no
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- way).
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- <mcc:convertDateTime> : Simple convert that overrides the spec DateTimeConverter and uses TimeZone.getDefault()
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- as
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- the
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- base
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- timezone,
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- rather
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- than
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- GMT.
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- Convert
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- date
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- time
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- using
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- normal
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- system
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- timezone
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- like
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- it
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- should.
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- In
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- JSF
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- 2.0
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- a
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- new
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- param
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- for
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- enable
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- this
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- behavior
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- for
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- f:convertDateTime
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- was
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- created
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- called
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- javax.faces.DATETIMECONVERTER_DEFAULT_TIMEZONE_IS_SYSTEM_TIMEZONE.
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- <mcc:convertEnum> : Alternate enum converter.
- <mcc:convertNumber> : Converter which uses either the manually set destType or the value binding to determine the correct destination type to convert the number to This tag creates a number formatting converter and associates it with the nearest parent UIComponent. It uses either the manually set destType or the value binding to determine the correct destination type to convert the number to.
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