I have some code as follows:
<f:loadBundle basename="messages.application" var="prop" />
<ui:param name="currentUserAttr" value="#{prop['currentUser']}" />
// currentUserAttr=currentUserVal
<h1>Welcome #{sessionScope.currentUserAttr.name}</h1> // should be evaludated to sessionScope.currentUserVal.name
I want to get the value of currentUserAttr then when reading from session replacing the attr with its value then getting the value from session, any ideas how to do that in EL 2.2?
Use the brace notation as well if you want to use a dynamic key.
<h1>Welcome #{sessionScope[currentUserAttr].name}</h1>
Related
This question already has answers here:
String concatenation in EL for dynamic ResourceBundle key
(4 answers)
Closed 7 years ago.
I have a <p:dataTable var="object"> with a <p:commandLink> inside. In my bean I have a Map whose value I want to display in <p:commandLink value> . I need to pass a key to this map which is a concatenation of "someString" and #{object.firstName}. I would something like this to work:
value="#{bean.map['someString'+object.firstName]}"
How can I achieve this?
You can concatenate strings in EL by creating a new EL variable with the string and EL expression just inlined. You can use <c:set> for that.
<c:set var="key" value="someString#{object.firstName}" />
<p:commandLink value="#{bean.map[key]}" ... />
Alternatively, if you're on EL 2.2 already which supports invoking direct methods, then you can just directly make use of String#concat() method.
<p:commandLink value="#{bean.map['someString'.concat(object.firstName)]}" ... />
If you're not on EL 2.2 yet, but are using EL 2.1, then you can always install JBoss EL to have the same feature.
Mr AC_1985 didn't respond but for information I have some working code along these lines.
<h:panelGrid columns="1" cellpadding="5" style="width:100%">
<p:inputTextarea id="factsText" style="width:100%; height:100%;" rows="18" cols="100"
value="#{property.model.property.facts[property.model.factsLanguage.code]}"
counter="display" maxlength="2000" counterTemplate="{0} characters remaining." autoResize="false" />
<h:outputText id="display" />
</h:panelGrid>
Here I have a combo box where I can select a language. Then the text is retrieved from the Map for the language selected.
Thanks My BalusC for your invaluable help, as always.
Allan
I use JSF 2.0 (Apache myFaces) on WebSphere Application Server 8.
I have a bean which contains a list of charts (data for jquery HighCharts).
For each chart I need some JSF components + one Highchart Wrapper written as CompositeCompoent (look here)
So I use the ui:repeat function of jsf 2 like this:
<?xml version="1.0" encoding="UTF-8" ?>
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.org/ui"
xmlns:c="http://java.sun.com/jsp/jstl/core"
xmlns:hc="http://java.sun.com/jsf/composite/chartComponents"
template="/template/mytemplate.xhtml">
<ui:define name="content">
<ui:repeat value="#{chartCtrl.charts }" var="chart" id="chartrepeat" varStatus="chartStatus">
#{chartStatus.index }
<h:form id="chartform_#{chartStatus.index }">
<!-- some jsf select stuff-->
</h:form>
#{chartStatus.index }
<hc:Chart title="Statistics" id="hcchart_#{chartStatus.index }"
<!-- here's the problem-->
<ui:repeat value="#{chart.series }" var="serie">
<hc:ChartSeries series="#{serie.data }" />
</ui:repeat>
</hc:Chart>
#{chartStatus.index }
</p:panel>
</ui:repeat>
<h:outputScript library="js" name="highcharts.js" />
<h:outputScript library="js/modules" name="exporting.js" />
<h:outputScript library="js" name="jquery-1.9.1.min.js" target="head" />
</ui:define>
</ui:composition>
The #{chartStatus.index } works every where but not in hc:Chart id="".
The generated js and div by this CC contains the id 'hcchart_chartdiv'. The index of the current repeat left.
How can I pass the correct number to the id attribute?
EDIT: Composite Component
Here is a part of the hc:Chart where the ID should be used
<cc:implementation>
<div id="#{cc.id}_chartDiv" />
<!-- Highcharts -_>
<script type="text/javascript">
$(function() {
// Data must be defined WITHIN the function. This prevents
// different charts using the same data variables.
var options = {
credits : {
enabled : false
},
chart : {
renderTo : '#{cc.id}_chartDiv',
....
</script>
When I leave the attribute id in hc:Chart empty, then the generated ID is something like "j_id568185923_1_5f9521d0_chartDiv". But still without :row:.
EDIT 2: IndexOf Approach
I tested another approach to set the ID of my chart.
id="hc_#{chartCtrl.charts.indexOf(chart) }"
I tried to use the IndexOf method of my ArrayList. I implemented HashCode und Equals method in all Classes. When I test it, it works fine.
But when I use it with EL I get -1 returned.
Solution
Just as BalusC said I cant use the ID tag for EL. So I simple created a new attribute in my CC. That works fine (just so easy).
Thanks BalusC.
Does someone has another idea?
The id attribute is evaluated during view build time. The <ui:repeat varStatus> is set during view render time which is after view build time. Essentially, you've the same problem as explained in detail here: JSTL in JSF2 Facelets... makes sense?
Any EL expression in the id attribute must be available during view build time. If you replace <ui:repeat> by <c:forEach> which runs during view build time, then the id must be properly set. An alternative is to just get rid of EL in those id attributes based on <ui:repeat varStatus>. JSF will already automatically suffix the IDs of <ui:repeat> child components with the row index.
Note that the <c:forEach> may have unforeseen side effects when used in combination with view scoped beans and partial state saving enabled. See the aforelinked answer for details.
we are still in a JSF 1.2 to 2.0 migration scenario and we are now facing a problem related to c:set or ui:param variables used inside an EL expression.
Here are the facts. There is a button as composite component:
<cc:interface name="button" shortDescription="A button.">
...
<cc:attribute
name="disabled"
required="false"
default="false"
shortDescription="The disabled flag." />
...
</cc:interface>
<cc:implementation>
<ice:commandButton
...
disabled="#{cc.attrs.disabled}"
... />
</cc:implementation>
Now we are trying to use this button component inside a toolbar. The disabled state of the button is determined inside the toolbar using a c:set or a ui:param (we already tried both ways).
<c:set var="isButtonEnabled" value="#{backingBean.buttonEnabled}" />
or
<ui:param name="isButtonEnabled" value="#{backingBean.buttonEnabled}" />
#{isButtonEnabled}
<ctrl:button
...
disabled="#{!isButtonEnabled}"
... />
So here is our problem. If we simple print out the value of "isButtonEnabled" in the toolbar, it is always correct. So the backing bean is ok. But when we try to pass this value to the composite component, it is not working. "Disabled" is always evaluated to false.
Sure we could pass the method expression directly (#{!backingBean.isButtonEnabled}) and this will work fine. But in our scenario the determination of the enabled-flag is much more complicated and I just tried to keep the example as simple as possible. Aditionally this flag is used for multiple buttons inside the toolbar, so we wanted to keep the code maintainable by using a c:set or ui:param. Is this the wrong way to handle this? What do you recommend?
Thanks in advance.
SlimShady
Your problem is the way value binding is done in JSF. The prefered way is to retrieve the EL Expression an attribute was populated with by invoking getValueExpression("attributeName"). Then this EL Expression can be used to get or set the value in the backing bean. As your not passing #{!isButtonEnabled} but #{cc.attrs.disabled} to ice:commandButton the binding fails.
I solved this for the p:selectOneMenu component of Primefaces by writing a wrapping UIComponent which defines a property wrappedValue and passed that property to the p:selectOneMenu. In the getter and setter of that property I then used getValueExpression to retieve the real EL Expression for the attribute.
<composite:interface componentType="de.gw2tome.component.valuewrapper">
<composite:attribute name="value" type="de.gw2tome.models.Rarity"
required="true" />
</composite:interface>
<composite:implementation>
<p:selectOneMenu value="#{cc.wrappedValue}"/>
...
</composite:implementation>
#FacesComponent("de.gw2tome.component.valuewrapper")
public class ValueWrapper extends UINamingContainer {
public void setWrappedValue(Object wrappedValue) {
ValueExpression expr = getValueExpression("value");
ELContext ctx = getFacesContext().getELContext();
expr.setValue(ctx, wrappedValue);
}
public Object getWrappedValue() {
ValueExpression expr = getValueExpression("value");
ELContext ctx = getFacesContext().getELContext();
return expr.getValue(ctx);
}
}
The component can now be used the following way:
<g:rarityChooser value="#{itemSearchBean.minRarity}" />
I have a template and in its Definition I use several forms and buttons.
The problem is the definition (define) xhtml file does not know the component hierarchy.
And for example I want to update the element "table2" in a different form in the same define file.
Template Insert:
<p:tabView id="nav"> <!-- nav -->
<ui:insert name="content_nav">content navigation</ui:insert>
</p:tabView>
defines the first level of my hierarchy "nav"
Template define:
<ui:define name="content_nav">
<h:form id="form1"> <!-- nav:form1 -->
<h:dataTable id="table1"/> <!-- nav:form1:table1 -->
<p:inputText value="#{bean.value}"/>
<p:commandButton action="..." update="nav:form2:table2"/>
</h:form>
<h:form id="form2">
<h:dataTable id="table2"/> <!-- nav:form2:table2 -->
<!-- other elements -->
</h:form>
</ui:define>
In my define part I don't want to know "nav"!
How can I do this? or how can I move one naming component upwards?, or save the highest parent complete id in a variable?
sometimes i saw something like:
update=":table2"
But I could not find any informations about this?, the JavaEE 6 documentation just mentions the # keywords.
Ugly, but this should work out for you:
<p:commandButton action="..." update=":#{component.namingContainer.parent.namingContainer.clientId}:form2:table2" />
As you're already using PrimeFaces, an alternative is to use #{p:component(componentId)}, this helper function scans the entire view root for a component with the given ID and then returns its client ID:
<p:commandButton action="..." update=":#{p:component('table2')}" />
ugly answer works well
update=":#{component.namingContainer.parent.namingContainer.clientId}:form2:table2
mainly more useful updating from opened dialog to parent datatable
You may use binding attribute to declare EL variable bound to JSF component. Then you may access absolute client id of this component by using javax.faces.component.UIComponent.getClientId(). See example below:
<t:selectOneRadio
id="yourId"
layout="spread"
value="#{yourBean.value}"
binding="#{yourIdComponent}">
<f:selectItems value="#{someBean.values}" />
</t:selectOneRadio>
<h:outputText>
<t:radio for=":#{yourIdComponent.clientId}" index="0" />
</h:outputText>
Try this:
<h:commandButton value="Click me">
<f:ajax event="click" render="table" />
</h:commandButton>
Additionally to the solutions above I had the problem, that I had to dynamically generate the to-be-updated components (many) based on server-side logic (with maybe harder to find out nesting).
So the solution on the server-side is an equivalent to update=":#{p:component('table2')}"1 which uses org.primefaces.util.ComponentUtils.findComponentClientId( String designId ):
// UiPnlSubId is an enum containing all the ids used within the webapp xhtml.
// It could easily be substituted by a string list or similar.
public static String getCompListSpaced( List< UiPnlSubId > compIds ) {
if ( compIds == null || compIds.isEmpty() )
return "" ;
StringBuffer sb = new StringBuffer( ":" ) ;
for ( UiPnlSubId cid : compIds )
sb.append( ComponentUtils.findComponentClientId( cid.name() ) ).append( " " ) ;
return sb.deleteCharAt( sb.length() - 1 ).toString() ; // delete suffixed space
}
called via some other method using it, e.g. like ... update="#{foo.getCompListComputed( 'triggeringCompId' )}".
1: first I tried without too much thinking to return public static String getCompListSpaced0() { return ":#{p:component('table2')}" ; } in an ... update="#{foo.getCompListSpaced0()} expression, which of course (after thinking about how the framework works :) ) is not resolved (returned as is) and may cause the issues with it some users experienced. Also my Eclipse / JBoss Tools environment suggested to write :#{p.component('table2')} ("." instead of ":") which did not help - of course.
Using Grails' GSP <g:set> tag, is it possible to specify the type of the variable? I want to declare an integer variable, but <g:set> always declares a sting. For example:
<g:set var="x" value="100"/>
${x.getClass()}
${x+23}
results in
class java.lang.String
10023
I'd like to declare x as an integer. I noticed that using the JSP tag <% int x=100; %> results in:
class java.lang.Integer
123
Is there a way to do this the Grails/GSP way?
Use the ${} syntax when defining the value. For example:
<g:set var="x" value="${100}"/>
You can see the tag doc for g:set for more info.
Just as an additional comment for someone who comes across this since it is the only useful result on the Internet for and casting/Int/Sring/etc. This example works in the case of variables:
<g:set var="printLeft" value="${offer?.metaInfo?.redeemPrintY as Integer}"/>
<g:set var="printTop" value="${offer?.metaInfo?.redeemPrintX as Integer}"/>
<g:set var="printWidth" value="${offer?.metaInfo?.redeemPrintW as Integer}"/>
<g:set var="printHeight" value="${offer?.metaInfo?.redeemPrintH as Integer}"/>
...
<area shape="rect" coords="${printLeft},${printTop},${printLeft+printWidth},${printTop+printHeight}" onClick="printOffer();" />