I'm working with JSF and JSTL, the code above doesn't work!
<ui:repeat var="reponse" value="#{gPost.reponses}"> UserLogin : #{reponse.utilisateur.login}
<c:if test="${reponse.utilisateur.login eq 'X'}">
Utilisateur equivalent X
</c:if>
</ui:repeat>
This code iterate, i have two element to be iterated, the output is this :
UserLogin : Y
UserLogin : X
It must be :
UserLogin : Y
UserLogin : X
Utilisateur equivalent X
The tag <c:if test="${reponse.utilisateur.login eq 'X'}"> is not correct?
JSTL tags like <c:if> runs during view build time, while JSF components like <ui:repeat> runs during view render time. So, with your code given so far, the #{reponse} is not available while JSTL is running, because <ui:repeat> hasn't run. You need a normal JSF component with rendered attribute instead.
<h:panelGroup rendered="#{reponse.utilisateur.login eq 'X'}">
Utilisateur equivalent X
</h:panelGroup>
See also:
JSTL in JSF2 Facelets... makes sense?
Related
I need to create a callback for <h:commandButton> while as a parameter I need to pass an argument that is string-concatenated with an external parameter id:
I tried nesting an EL expression something like this:
<h:commandButton ... action="#{someController.doSomething('#{id}SomeTableId')}" />
However this failed with an EL exception. What is a right syntax/approach to do this?
If you're already on EL 3.0 (Java EE 7; WildFly, Tomcat 8, GlassFish 4, etc), then you could use the new += operator for this:
<h:commandButton ... action="#{someController.doSomething(id += 'SomeTableId')}" />
If you're however not on EL 3.0 yet, and the left hand is a genuine java.lang.String instance (and thus not e.g. java.lang.Long), then use EL 2.2 capability of invoking direct methods with arguments, which you then apply on String#concat():
<h:commandButton ... action="#{someController.doSomething(id.concat('SomeTableId'))}" />
Or if you're not on EL 2.2 yet, then use JSTL <c:set> to create a new EL variable with the concatenated values just inlined in value:
<c:set var="tableId" value="#{id}SomeTableId" />
<h:commandButton ... action="#{someController.doSomething(tableId)}" />
See also:
String concatenation in EL for dynamic ResourceBundle key
I have a JSF command like this:
<h:commandLink id="testId" onclick="if (#{bean.isPageOpen}) dlg.show();" />
The boolean bean.isPageOpen was false initially so the dlg widget was not opened. Now when I change the condition i.e. bean.isPageOpen returns true, the widget still does not get open.
Is the EL expression evaluated only once and never again for JSF commandLink?
Thanks,
-csn
Javascript codes is producing on page load. If you check your page source , You can see your onclick like this.
onclick="if (false) dlg.show();"
If you want to use updated value in your bean.You might use structure like this.I'm using primefaces.
<p:inputText id="textId" value="#{{bean.isPageOpen}" />
<h:commandLink id="testId" onclick="refresh(); if (document.getElementById('textId').value=='true') dlg.show();" />
<p:remoteCommand name="refresh" actionListener="#{bean.updateisPageOpen}" update ="textId"/>
I need to create a callback for <h:commandButton> while as a parameter I need to pass an argument that is string-concatenated with an external parameter id:
I tried nesting an EL expression something like this:
<h:commandButton ... action="#{someController.doSomething('#{id}SomeTableId')}" />
However this failed with an EL exception. What is a right syntax/approach to do this?
If you're already on EL 3.0 (Java EE 7; WildFly, Tomcat 8, GlassFish 4, etc), then you could use the new += operator for this:
<h:commandButton ... action="#{someController.doSomething(id += 'SomeTableId')}" />
If you're however not on EL 3.0 yet, and the left hand is a genuine java.lang.String instance (and thus not e.g. java.lang.Long), then use EL 2.2 capability of invoking direct methods with arguments, which you then apply on String#concat():
<h:commandButton ... action="#{someController.doSomething(id.concat('SomeTableId'))}" />
Or if you're not on EL 2.2 yet, then use JSTL <c:set> to create a new EL variable with the concatenated values just inlined in value:
<c:set var="tableId" value="#{id}SomeTableId" />
<h:commandButton ... action="#{someController.doSomething(tableId)}" />
See also:
String concatenation in EL for dynamic ResourceBundle key
I am trying to render richfaces and jsf UI elements dynamically based on the dataType value.
Ex : I have a enum as below
public enum DataType {
DT_LONGLONG(1), DT_STRING(2), DT_LONG(3), DT_DATE(4), DS_EXTERNALREFERENCE(5),
DT_BOOLEAN(6), DT_FLOAT(7), DT_SHORT(8);
}
Then in xhtml page while iterating through the list of my custom objects, I check for the dataType and render the UI elements accordingly as below :
<c:if test="#{meaCompPartAttr.dataType.dataType == 2}">
<h:inputText />
</c:if>
<c:if test="#{(meaCompPartAttr.dataType.dataType == 1) or
(meaCompPartAttr.dataType.dataType == 3) or
(meaCompPartAttr.dataType.dataType == 8)}">
<h:inputText onkeyup="javascript:validateField(this, '#{tpMsgs.longRegularExpression}');">
<f:validateLongRange/>
</h:inputText>
</c:if>
<c:if test="#{meaCompPartAttr.dataType.dataType == 7}">
<h:inputText onkeyup="javascript:validateField(this, '#{tpMsgs.doubleRegularExpression}');">
<f:validateDoubleRange/>
</h:inputText>
</c:if>
<c:if test="#{meaCompPartAttr.dataType.dataType == 6}">
<h:selectBooleanCheckbox />
</c:if>
<c:if test="#{meaCompPartAttr.dataType.dataType == 4}">
<rich:calendar />
</c:if>
Because of this I usually get class cast exceptions like String to Boolean or Long to String etc. I assume this is happening coz jstl and jsf code do not run in sync.
Is there any other approach to render UI elements dynamically as proposed in the above sample?
So you're iterating using <ui:repeat> or <h:dataTable> or any other JSF iterating component instead of the JSTL <c:forEach>? Either use <c:forEach> instead, or use the rendered attribute instead of <c:if>.
See also:
JSTL in JSF2 Facelets... makes sense?
How to create dynamic JSF form fields
I have a question about outputing a list of objects as a comma separated list in JSF.
Let's say:
public class SomeObj {
private String name;
... constructors, getters and setters ...
}
and List<SomeObj>:
List<SomeObj> lst = new ArrayList<SomeObj>();
lst.add(new SomeObj("NameA"));
lst.add(new SomeObj("NameB"));
lst.add(new SomeObj("NameC"));
to output it as a listbox I can use this code:
<h:selectManyListbox id="id1"
value="#{listHolder.selectedList}">
<s:selectItems value="#{listHolder.lst}"
var="someObj"
label="#{someObj.name}"/>
<s:convertEntity />
</h:selectManyListbox>
But what is the easiest way to output the list as is, comma seperated ? Like this:
NameA, NameB, NameC
Should I use JSTL <c:forEach/> or may be the <s:selectItems/> tag can also be used ?
Given a List<Person> persons where Person has a name property,
If you're already on Java EE 7 with EL 3.0, then use EL stream API.
#{bean.persons.stream().map(p -> p.name).reduce((p1, p2) -> p1 += ', ' += p2).get()}
If you're not on EL 3.0 yet, but have JSF 2.x at hands, then use Facelets <ui:repeat>.
<ui:repeat value="#{bean.persons}" var="person" varStatus="loop">
#{person.name}#{not loop.last ? ', ' : ''}
</ui:repeat>
Or if you're still on jurassic JSP, use JSTL <c:forEach>.
<c:forEach items="#{bean.persons}" var="person" varStatus="loop">
${person.name}${not loop.last ? ', ' : ''}
</c:forEach>
See also:
How iterate over List<T> and render each item in JSF Facelets
JSTL in JSF2 Facelets... makes sense?
use <ui:repeat> (from facelets). It's similar to c:forEach
Or pre-compute the comma-separated string in the managed bean, and obtain it via a getter.
If you can't use varStatus because you're stuck with using JSF 1.2, you can do:
<ui:repeat value="#{listHolder.lst}" var="someObj">#{someObj != listHolder.lst[0] ? ',' : ''}
#{someObj.name}</ui:repeat>
The absence of whitespace around the EL-expressions is deliberate, we don't want a space to appear there in the rendered HTML.