I have a ui:repeat that returns a list of entity. Is there any way to know that the returned list is empty?
<ui:repeat id="resulta" value="#{testController.testList}" var="list">
<div>list.name</div>
</ui:repeat>
something like if ui:repeat is empty then display a div saying "List is empty"
i've heard about varStatus -> Facelets repeat Tag Index
but i don't think there is something for empty list. or is there?
UPDATED
<ui:repeat id="resulta" value="#{testController.testList}" var="list">
<div>list.name</div>
<h:panelGroup rendered="#{empty list}">
list is empty!
</h:panelGroup>
</ui:repeat>
I tried to render the "list is empty!" when the list is empty but then it doesn't show.
<ui:repeat id="resulta"
value="#{testController.testList}"
var="list">
<div>
#{list.name}
</div>
</ui:repeat>
<h:panelGroup rendered="#{empty testController.testList}">
List is empty!
</h:panelGroup>
rendered is a conditional statement which only if it is true renders. In case you want to render the last h:panelGroup as a div instead of a span, consider adding layout='block' to the element.
You can display your empty list message outside your <ui:repeat> element as:
<ui:repeat id="resulta"
value="#{testController.testList}"
var="list"
rendered="#{not empty testController.testList}">
<div>
#{list.name}
</div>
</ui:repeat>
<h:panelGroup rendered="#{empty testController.testList}">
list is empty!
</h:panelGroup>
Related
I have the following JSF construct:
<c:set var="myVar" value="#{myBean.getMyMap()}" scope="request" />
<h:form>
<p>
<h:outputText value="Output1: " />
<h:selectOneMenu value="#{myMappingsBean.data.attribute1}" binding="#{input1}" required="true">
<f:selectItems var="entry" value="#{myVar}"/>
<p:ajax update="myDropdown"/>
</h:selectOneMenu>
</p>
<p>
<h:outputText value="Output2: " />
<h:selectOneMenu id="myDropdown" value="#{myMappingsBean.data.attribute2}" binding="#{input2}" required="true" converter="javax.faces.Double">
<f:selectItems var="entry" value="#{myVar.get(input1.value)}"/>
</h:selectOneMenu>
</p>
</h:form>
Behind myVar is a map defined like that: Map<String, Collection<Double>>
The first dropdown menu shows a list of all the keys of that map (like desired), but the value behind that is the collection of values.
Here the HTML output of one option of that dropdown:
<option value="[1.0, 2.0]">SomeString</option>
My second dropdown should list the collection of double values stored in the map behind the key, that is selected by the first menu.
The problem now is, when I use value="#{myVar.get(input1.value)}" the value I get from .value is the collection and not the string/key of the map. So I never get the desired result.
How can I get the string/key behind the binded object input1? Is there something like input1.name or .toString? Is somewhere a documentary for this?
Ok, I solved it by applying the solution from here.
The first drop down has to be edited to the following:
<p>
<h:outputText value="Output1: " />
<h:selectOneMenu value="#{myMappingsBean.data.attribute1}" binding="#{input1}" required="true">
<f:selectItems var="entry" value="#{myVar.entrySet()}" itemValue="#{entry.key}" itemLabel="#{entry.key}"/>
</h:selectOneMenu>
</p>
As you can see, the entry set is created from the map and from that you use the key as value and label.
And with that the value behind input1.value now is not the collection of doubles but the key of the map.
I would like to define a variable and reuse it somewhere else on the page. I'm defining variable in JSF using <ui:param> and <c:set> and resetting it in the <ui:repeat> depending on condition as follows:
<ui:param name="title" value="default value"/>
<c:set var="title2" value="default val"/>
<ui:repeat value="#{aClip.revisions}" var="revs" varStatus="revStat">
<ui:repeat value="#{revs.metadataMap.entry}" var="entryLst">
<ui:repeat value="#{entryLst}" var="entry">
<ui:repeat value="#{entry.value}" var="metaVal">
<ui:repeat value="#{metaVal.values}" var="aValue">
<ui:fragment rendered="#{metaVal.key eq 'Title'}">
rendered //this prints. condition is evaluted to true
<ui:param name="title" value="#{aValue}"/>
<c:set var="title2" value="#{aValue}"/>
title2 -- #{title2} title -- #{title} //prints
</ui:fragment>
</ui:repeat>
</ui:repeat>
</ui:repeat>
</ui:repeat>
</ui:repeat>
title2 -- #{title2} title -- #{title} //does not print value not even defualt val
I know condition is true and value is set, but when I try to use it outside loop, it doesn't evalute. It doesn't even evalute to defualt value given to variable while defining.
How is this caused and how can I solve it?
How do I show JSF components if a list is not null and it has a size() > 0?
EL offers the empty operator which checks both the nullness and emptiness of an object.
Thus, this should do:
<h:dataTable value="#{bean.list}" var="item" rendered="#{not empty bean.list}">
No need for a clumsy double check on both null and size() as suggested by other answers.
See also:
How do I display a message if a jsf datatable is empty?
Conditionally displaying JSF components
use rendered attribute. most of the components have this attribute.This attribute;s main purpose is to render components conditionally.
<h:dataTable value="#{bean.list}" rendered="{bean.list !=null && bean.list.size()>0}" >
In the above piece of jsf code, datatable would only be rendered when list is not null and the size of list is greater than 0
<h:outputText value="No Data to Display!" rendered="#{empty list1.List2}" />
<a href="#">
<h:outputText value="Data is present" rendered="#{not empty list1.List2}" /></a>
Or
<h:outputText value="#{not empty list1.List2 ? 'Data is Present' : 'No Data to Display'}" style="color:blue"/>
I want to render a panelGrid with a fixed number of columns but elements are loaded from a list. The code should be as follows:
<h:panelGrid columns="3">
<h:outputText value="Header 1"/>
<h:outputText value="Header 2"/>
<h:outputText value="Header 3"/>
<ui:repeat value="#{bean.collection}" var="obj">
<p:panel>
<h:outputText value="#{obj.value}"/>
</p:panel>
</ui:repeat>
</p:panelGrid>
The problem is this code is not rendering as I expected, because all panels are enclosed in the first TD generated by panelGrid, and I want a row break every 3 elements. It seems all repeat block is executed prior the rendering. I'm sure I can obtain this behaviour. What I'm doing wrong?
Thanks
ui:repeat is a component and it is part of the component tree. To create what you are planning try using tag handler c:forEach instead.
<c:forEach items="#{bean.collection}" var="obj">
<p:panel>
<h:outputText value="#{obj.value}"/>
</p:panel>
</c:forEach>
I can show the objects of the plain arrayList.
ArrayList<Object>names;
<ui:repeat value="#{bean.names}" var="t">
<ul>
<li render="" id="hm">
<a>#{t.name}</a>
</li>
</ul></ui:repeat>
But if I have List<ArrayList<Object>> names2 = new ArrayList<ArrayList<Object>>();
I tried to use nested <ui:repeat> or <c:forEach> but it doesn't work. I dont want to use data tables since I want to display them as a list.
E.g I tried to do this but it doesn't work, neither with <ui:repeat>, is it possible what I try to do?
<ul>
<li>
<c:forEach items="#{bean.names2}" var="row">
<c:forEach items="#{row}" var="nested_row">
<c:forEach items="#{nested_row}" var="t">
<a>#{t.name}</a>
</c:forEach>
</c:forEach>
</c:forEach>
</li>
</ul>
Your code attempt with three <c:forEach>s expects a 3D array/list. Get rid of that one <c:forEach> too much.
<c:forEach items="#{bean.names2}" var="row">
<c:forEach items="#{row}" var="nested_row">
#{nested_row.name}
</c:forEach>
</c:forEach>
The same should work for <ui:repeat>.