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I can access my variable stored in a backing bean from my JSF2 page, so things like
<h:outputText value="#{myBean.myValue}"/>
work, and the value (which is an int btw.) prints okay. However, when trying to use this value in conditional expressions within c:if and/or c:when tags it never equals anything... so:
<c:if test="#{myBean.myValue == 1}">
<c:set var="myVar" value="true"/>
</c:if>
<c:choose>
<c:when test="#{myBean.myValue > 1}">
<c:set var="myVar" value="true"/>
</c:when>
</c:choose>
or even
#{myBean.myValue eq '1'}
or
#{myBean.myValue == '1'}
will never evaluate to true, even if the value is indeed 1 or >1.
Annoyingly the comparison works in the rendered attribute of a tag! So this:
<h:outputText value="whatever" rendered="#{myBean.myValue == 1}"/>
is fine!
What is going on?
UPDATE:
This works:
public int getMyValue() {
return 1;
}
but this does not:
@Column(name = "orderstatus")
public int getOrderStatus() {
return orderStatus;
}
The int's value is printed correctly, but 1 == 1 is false.
Are entity beans handled in a special way? Can I use them for displaying their value on the UI?
UPDATE2:
<h:outputText value="#{order.adcOrderStatus.orderStatus.class}"/>
prints java.lang.Integer.
UPDATE3:
Here is the full code:
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:c="http://java.sun.com/jsp/jstl/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:cc="http://java.sun.com/jsf/composite">
<cc:interface>
<cc:attribute name="orderStatus" required="true"/>
</cc:interface>
<cc:implementation>
<c:choose>
<c:when test="#{cc.attrs.orderStatus == 1}" >
<c:set var="unknownStatus" value="false"/>
</c:when>
<c:when test="#{cc.attrs.orderStatus == 2}" >
<c:set var="unknownStatus" value="false"/>
</c:when>
<c:when test="#{cc.attrs.orderStatus == 3}" >
<c:set var="unknownStatus" value="false"/>
</c:when>
<c:when test="#{cc.attrs.orderStatus == 99}" >
<c:set var="unknownStatus" value="false"/>
</c:when>
<c:otherwise>
<c:set var="unknownStatus" value="true"/>
</c:otherwise>
</c:choose>
<h:graphicImage url="#{resource['img/icons/flag_yellow.png']}" rendered="#{cc.attrs.orderStatus == 1}"/>
<h:outputText value="Created" rendered="#{cc.attrs.orderStatus == 1}"/>
<h:graphicImage url="#{resource['img/icons/flag_orange.png']}" rendered="#{cc.attrs.orderStatus == 2}"/>
<h:outputText value="Stopped" rendered="#{cc.attrs.orderStatus == 2}"/>
<h:graphicImage url="#{resource['img/icons/flag_green.png']}" rendered="#{cc.attrs.orderStatus == 3}"/>
<h:outputText value="Active" rendered="#{cc.attrs.orderStatus == 3}"/>
<h:graphicImage url="#{resource['img/icons/flag_red.png']}" rendered="#{cc.attrs.orderStatus == 99}"/>
<h:outputText value="Failed" rendered="#{cc.attrs.orderStatus == 99}"/>
<h:graphicImage url="#{resource['img/icons/question_mark.png']}" rendered="#{unknownStatus}"/>
<h:outputText value="Unknown" rendered="#{unknownStatus}"/>
</cc:implementation>
</html>
It works when called with an int value. But this doesn't work:
<p:dataTable value="#{cc.attrs.orders}" var="order">
<p:column>
<f:facet name="header">
<h:outputText value="Status"/>
</f:facet>
<mytag:orderStatus orderStatus="#{order.adcOrderStatus.orderStatus}"/>
</p:column>
</p:dataTable>
This displays the correct value:
<h:outputText value="#{order.adcOrderStatus.orderStatus.class}"/>
587
The < c:otherwise > is also subtag of < choose > it follows &l;twhen > tags and runs only if all the prior condition evaluated is 'false'. The c:when and c:otherwise works like if-else statement. But it must be placed inside c:choose tag.
JSTL stands for JSP Standard Tag Library. JSTL is the standard tag library that provides tags to control the JSP page behavior. JSTL tags can be used for iteration and control statements, internationalization, SQL etc.
The JavaServer Pages Standard Tag Library (JSTL) is a collection of useful JSP tags which encapsulates core functionality common to many JSP applications. It extends the JSP specification by adding a tag library of JSP tags for common tasks, Summary:You cannot use. Show activity on this post.
The <c:choose> works like a Java switch statement in that it lets you choose between a number of alternatives. Where the switch statement has case statements, the <c:choose> tag has <c:when> tags.
Did you declare JSTL core taglib as follows?
<html xmlns:c="http://java.sun.com/jsp/jstl/core">
If not or incorrectly declared, they it simply won't be parsed and end up plain vanilla in generated HTML output. You can confirm this by opening the page in browser, rightlicking it and choosing View Source. You should not see any JSTL tag in there.
Update: as per your update, it's related to the fact that JSTL runs during build time of the view and JSF during render time of the view. In your particular case, this all would fail if #{cc.attrs.orderStatus} only available during render time of the view. For example, when it represents the currently iterated item of an iterating component, such as <h:dataTable>.
You'd better rewrite the composite component as follows to use the rendered attribute instead:
<h:panelGroup rendered="#{cc.attrs.orderStatus == 1}">
<h:graphicImage url="#{resource['img/icons/flag_yellow.png']}" /> Created
</h:panelGroup>
<h:panelGroup rendered="#{cc.attrs.orderStatus == 2}">
<h:graphicImage url="#{resource['img/icons/flag_orange.png']}" /> Stopped
</h:panelGroup>
<h:panelGroup rendered="#{cc.attrs.orderStatus == 3}">
<h:graphicImage url="#{resource['img/icons/flag_green.png']}" /> Active
</h:panelGroup>
<h:panelGroup rendered="#{cc.attrs.orderStatus == 99}">
<h:graphicImage url="#{resource['img/icons/flag_red.png']}" /> Failed
</h:panelGroup>
<h:panelGroup rendered="#{cc.attrs.orderStatus != 1 && cc.attrs.orderStatus != 2 && cc.attrs.orderStatus != 3 && cc.attrs.orderStatus != 99}">
<h:graphicImage url="#{resource['img/icons/question_mark.png']}" /> Unknown
</h:panelGroup>
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