I have searched and tried but this time I'm really stuck.
I am trying to build a simple datatable (primefaces) where the cell content can be of different types. There is a holder class for each cell content that can hold different entities and I want to use < c:choose> to check and display the right entity in the entity specific way.
The code looks like:
<p:dataTable emptyMessage="" value="#{date.getThreadContent(column.propertyID)}" var="content">
<p:column>
#{content.type}
<c:choose>
<c:when test="#{content.type == 'activity'}">
#{content.activity.name}
</c:when>
<c:when test="#{content.type == 'todo'}">
#{content.activity.name}
</c:when>
<c:otherwise>
Neither activity or todo
</c:otherwise>
</c:choose>
</p:column>
</p:dataTable>
The EL evaluation doesn't work regardless if I try a boolean or String values in the bean (I'm using String value in the code above).
So each time the content is not empty, the output first displays the correct content type from #{content.type} but then together with 'Neither activity or todo'.
I can also say that this data table itself represents a cell content in a parent data table (list of entities per date) that is not visible in this code as I try to isolate the problem.
Could it be that this type of expression cannot be done in a ?
Any help is appreciated.
Use JSF rendered tags to do your conditional display logic, it removes it from the DOM completely and makes validations easier.
Refer: http://docs.oracle.com/javaee/6/tutorial/doc/bnaik.html for EL expressions
Also a good explanation is provided by BalusC here: JSTL c:if doesn't work inside a JSF h:dataTable
<p:dataTable emptyMessage="" value="#{date.getThreadContent(column.propertyID)}" var="content">
<p:column>
#{content.type}
<h:outputText value="#{content.activity.name}" rendered="#{content.type == 'activity' or content.type == 'todo'}" />
<h:outputText value="Neither activity or todo" rendered="#{content.type != 'activity' and content.type != 'todo'}" />
</p:column>
</p:dataTable>
Related
I got a list of objects displayed in a page.
This is the view:
<h:form>
<h:dataTable var="o" value="#{opleidingController.opleidingen}" border="0" >
<h:column>
<f:facet name="header">Code</f:facet>
<h:link value="#{o.opl_code}" outcome="#{opleidingController.getOpleidingByCode(o.opl_code)}" />
</h:column>
<h:column>
<f:facet name="header">Titel</f:facet>
<h:outputText value="#{o.opl_titel} "></h:outputText>
</h:column>
<h:column>
<f:facet name="header">Thema</f:facet>
<h:outputText value="#{o.opl_thema} "></h:outputText>
</h:column>
</h:dataTable>
</h:form>
This displays everything very well.
Like you can see I got the code part of the object set as a link.
With this code I get an object out of the database, from which I display the details.
The problem here is that every link displays the details of the last object of the list instead of the current object where I click the link.
This is the function I call (which works):
public String getOpleidingByCode(String code) {
this.opleiding = this.opleidingFacade.getOpleidingByCode(code);
return "details";
}
I hope any of this makes any sense?
Sorry if the solution is super clear but I am new to all of this.
Thanks in advance!
Kind regards
Deflandrex
EDIT:
This is the function that I use to call the first view (from which I provided the code)
public String getOpleidingenOpThema() {
this.opleidingen = this.opleidingFacade.getOpleidingenOpThema();
return "resultaat";
}
Both the functions are located in 1 controller.
What happens with the current code :
The outcome value is processed for each link element in the datatable sequentially by calling the opleidingController. getOpleidingByCode(o.opl_code). The backing bean method sets the this.opleiding value corresponding to the o.opl_code. Once all the links's outcome values are processed this.opleiding holds the value of the last o.opl_code. Hence, you are seeing last value from the list in the details page.
One Proposed solution:
The this.opleiding value should be set in the controller based on the o.opl_code when you process the details after clicking the link and not when the link is displayed and the outcome is set. You need to
Set outcome="details" in the h:link tag as this value is static and does not change based on any logic in the backing bean and remove method binding.
Pass the value of o.opl_code as a request parameter to the link as given below within the h:link tag.
<f:param name="opl_code" value="#{o.opl_code}"/>
Have the detail backing bean load the this.opleiding value based on the request parameter opl_code. This way you will have details for specific opl_code based on what link you click.
I have a question based in the following situation.
I have a backing bean that create a matrix with ints, in rows, columns and cells (tablaBean). I have no problem displaying it in a jsf view. Each one of those ints, it´s an ID of differents objects. How can I do, if I want to show in my JSF view, instead of ints, some attributes of the objects?
This is my dataTable:
<p:dataTable var="rowName" value="#{tablaBean.rowNames}" rowIndexVar="rowIdx">
<p:column headerText="Alumnos:">
<h:outputText value="#{rowName}"/>
</p:column>
<p:columns var="colName" value="#{tablaBean.colNames}"
headerText="#{colName}" columnIndexVar="colIdx">
<p:panel>
<h:outputText value="#{tablaBean.data2D[rowIdx][colIdx]}"/>
</p:panel>
</p:columns>
</p:dataTable>
So for example:
tablaBean.data2D[1][1]=3
But I don´t want to show the number "3" in my view.
I want to take that number and show the Person.name of my object Person.id=3;
Hope my question is clear enough.
Create in your backing bean method returning person name:
public String getPersonNameById(int idPerson) {
return myDao.findPersonById(idPerson).getName();
}
Use it in xhtml:
<h:outputText value="#{tableBean.getPersonNameById(tablaBean.data2D[rowIdx][colIdx])}"/>
i have p:selectOneMenu, all values are viewed correctly but just first on my list can be chosen for example, on my list i have e-mail addresses, i can choose everyone but mail is sending just on first of them on list. My JSF code:
<p:dataTable value="#{additionalOrdersBean.additionalOrdersList}"
var="additionalOrders" rowIndexVar="lp" id="myTable" editable="true>
<p:column>
<p:selectOneMenu id="recipient" value="#{additionalOrdersBean.mailTo}" converter="#{mailConverter}" required="true" requiredMessage="#{loc['fieldRequired']}">
<f:selectItems value="#{buildingBean.buildingList2}" var="mail" itemLabel="#{mail.mail1}" itemValue="#{mail.mail1}" />
<f:selectItems value="#{buildingBean.buildingList2}" var="mail" itemLabel="#{mail.mail2}" itemValue="#{mail.mail2}" />
<f:selectItems value="#{buildingBean.buildingList2}" var="mail" itemLabel="#{mail.mail3}" itemValue="#{mail.mail3}" />
</p:selectOneMenu>
<h:message for="recipient" style="color:red"/>
<h:commandButton value="#{loc['send']}" action="#{additionalOrdersBean.sendProtocol()}" onclick="sendProtocolDialog.hide()"/>
</p:column>
</p:dataTable>
My bean:
private String mail1;
private String mail2;
private String mail3;
public List<Building> getBuildingList2() {
buildingList2 = getBldRepo().findByLocationId(lid);
return buildingList2;
}
Can anyone know how to fix it? I wont to send e-mail on choosen address not just on first on my list. Thanks
You seem to expect that only the current row is submitted when you press the command button in the row. This is untrue. The command button submits the entire form. In your particular case, the form is wrapping the whole table and thus the dropdown in every single row is submitted.
However, the value attribute of all those dropdowns are bound to one and same bean property instead of to the currently iterated row.
The consequence is, for every single row, the currently selected value is set on the bean property, hereby everytime overriding the value set by the previous row until you end up with the selected value of the last row.
You've here basically a design mistake and a fundamental misunderstanding of how basic HTML forms work. You basically need to move the form to inside the table cell in order to submit only the data contained in the same cell to the server.
<p:dataTable ...>
<p:column>
<h:form>
...
</h:form>
</p:column>
</p:dataTable>
If that is design technically not an option (for example, because you've inputs in another cells of the same row, or outside the table which also need to be sent), then you'd need to bind the value attribute to the currently iterated row instead and pass exactly that row to the command button's action method:
<p:dataTable value="#{additionalOrdersBean.additionalOrdersList}" var="additionalOrders" ...>
<p:column>
<p:selectOneMenu value="#{additionalOrders.mailTo}" ...>
...
</p:selectOneMenu>
...
<h:commandButton value="#{loc['send']}" action="#{additionalOrdersBean.sendProtocol(additionalOrders)}" ... />
</p:column>
</p:dataTable>
It's by the way not self-documenting and quite confusing to have a plural in the var name. Wouldn't you rather call it additionalOrder? Or is the javabean/entity class representing a single additional order really named AdditionalOrders?
Unrelated to the concrete problem: doing business logic in getter methods is killing your application. Just don't do that. See also Why JSF calls getters multiple times.
I'm having a problem with the dataTable multiple selection with checkbox (like the second one: http://primefaces.org/showcase/ui/datatableRowSelectionRadioCheckbox.jsf).
When I try to execute a method in my backingBean, the selected items always comes with the right size, but, with the same object.
Example: I select in my dataTable three Messages: Message 1, Message 2 and Message 3. When I execute my method in the JSF page my selected items comes like this:
Messages[0] = Message 1
Messages[1] = Message 1
Messages[2] = Message 1
Here is my JSF Page:
<p:dataTable id="mensagensLidas" var="msg" value="#{mensagensBean.msgGrupoModel}"
paginator="true" rows="10" selection="#{mensagensBean.selectedMsgsGrupo}">
<p:column selectionMode="multiple" style="width:2%"/>
<p:column headerText="Titulo:" style="width:49%">
#{msg.titulo}
</p:column>
<f:facet name="footer">
<p:commandButton id="multiViewButton" value="#{msgs.delete}" icon="ui-icon-trash" actionListener="#{mensagensBean.excluirMsgsGrupo}" update=":tabMain" ajax="true"/>
</f:facet>
</p:dataTable>
Your above code is working fine for me except that I'm using a rowKey.
Try using rowKey attribute in p:dataTable
<p:dataTable id="mensagensLidas" var="msg" value="#{mensagensBean.msgGrupoModel}"
paginator="true" rows="10" selection="#{mensagensBean.selectedMsgsGrupo}"
rowKey="#{msg.titulo}">
....
</p:dataTable>
Using rowKey is must and best practice when you have selection in Datables, it helps to map the selected <tr> to the POJOs that you're filling up with.
Usually its even better if your rowKey is unique propety, you can even put an integer variable in your #{msg} POJO as best practice.
I discovered the problem. My DataModel was with the getRowData returning always the same object. I was doing a wrong comparison. Thank you all!
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"/>