I have a problem with data in a <p:rowExpansion> being loaded before the row is expanded (which leads to loads of web service requests).
I am using PrimeFaces 5.2. I have a dataTable with lazy loading and pagination. Inside of the table, I have <p:rowToggler> with a <p:rowExpansion>:
<p:dataTable var="order"
widgetVar="orderTable"
lazy="true"
value="#{ordersBean.orders}"
paginator="true"
rows="20"
rowsPerPageTemplate="20,50,100"
filterDelay="300"
styleClass="filtered">
<p:column width="4%">
<p:rowToggler />
</p:column>
<p:column headerText="Order number" width="96%">
<h:outputText value="#{order.number}" />
</p:column>
<p:rowExpansion>
<h:panelGrid columns="1">
<h:outputText value="#{order.number}" />
<h:outputText value="#{order.info}" />
<h:dataTable var="item" value="#{ordersBean.getItemsInOrder(order.number)}">
<h:column>
<h:outputText value=" #{item.title}" />
</h:column>
</h:dataTable>
</h:panelGrid>
</p:rowExpansion>
</p:dataTable>
When I first load the page, the getItemsInOrder() method is not called, except for when I expand a row. But if I navigate to page 2 (or if I navigate back to page 1 later) using the paginator, then getItemsInOrder() is called for every row in the outer table. Since I have 20 rows showing, navigating between the pages leads to 20 web service requests (in getItemsInOrder()).
How do I prevent it from calling the getItemsInOrder() method until the row is expanded?
I have the same problem. Until I find a better solution, this is the workaround I am using:
register a (DataTable event-) listener on event rowToggle.
In the listener, store an identifier of the toggled row. Hint: you can get the row object with event.getData()
Instead of directly accessing the data requesting component, write a proxy method in front of it which checks if the requested object belongs to the identifier stored in the listener.
I am using prime-faces 5 and jsf, I've created dynamic 2D arraylist table based on Tester and Date, first time its showing values correctly with date. But next time onwards its showing different tester name in single row.
The above showing first row correctly showing tester name but 2nd and 3rd showing different values. But i want to display same tester name in each row level.
MY XHTML:
<div align="left" class="width100">
<div class="DTHeader">
<h:form id="frmres">
<h:panelGrid columns="2"
style="padding-top:35px;padding-left:30px;">
<h:outputText class="lighttxt1" value="Schedule Date" />
<p:calendar id="button" value="#{schedulerbean.sch.scheDate}"
styleClass="cal schdate" label="Schedule Date" showOn="button"
pattern="dd/MM/yyyy HH:mm" showButtonPanel="true"
required="true">
</p:calendar>
<h:outputText value="TCU Goal" class="lighttxt1" />
<h:panelGrid columns="1" >
<p:inputText id="tcu" label="The Value given in TCU is"
style="border: 1px solid #A8A8A8 !important;background: transparent !important;"
styleClass="txtbig" value="#{schedulerbean.sch.tcu}"
keypadOnly="true" required="#{tcselectionbean.mancnt} != 0}" />
<h:outputText value="(Total Tcu:#{schedulerbean.tottalTCU})" class="lighttxt1" />
</h:panelGrid>
<h:outputText value="Select Squad" styleClass="txtblack14" />
<p:selectOneMenu value="#{schedulerbean.sch.squadparam}"
panelStyleClass="panel" styleClass="DTDD ddwidth1">
<f:selectItem itemLabel="All Tester" itemValue=""
styleClass="txtblack14" />
<f:selectItems value="#{schedulerbean.squadLst}" var="squadval"
itemLabel="#{squadval}" itemValue="#{squadval}"
styleClass="txtblack14" />
</p:selectOneMenu>
</h:panelGrid>
<h:panelGrid columns="1">
<p:commandButton
actionListener="#{schedulerbean.resourcePlanWithPossibleEnddate}"
value="Calculate" styleClass="blubtn"
update=":frmres:reservtable" />
<h:panelGroup id="reservtable">
<table class="bor bortd" style="margin-left:32px;">
<thead>
<tr>
<th>Tester Name / Dates</th>
<c:forEach var="resdate" items="#{schedulerbean.resDateList}">
<th>#{resdate}</th>
</c:forEach>
</tr>
</thead>
<c:forEach var="reserv" items="#{schedulerbean.resList}">
<tr>
<td>
<h:selectBooleanCheckbox value="#{schedulerbean.testerCheckboxmap[reserv.testerName]}"
styleClass="lighttxt1" />#{reserv.testerName}</td>
<c:forEach var="resdate1" items="#{schedulerbean.resDateList}">
<td class='c#{reserv.reserveType.get(resdate1)}'>
#{reserv.testerName} #{reserv.tcuMap.get(resdate1)}</td>
</c:forEach>
</tr>
</c:forEach>
</table>
</h:panelGroup></h:panelGrid>
<p:commandLink styleClass="bluelinknew"
action="#{schedulerbean.setSchedulestep('step3')}"
update=":schmenufrm" value="Next" style="float:right;"
onclick="javascript:changets('schedule');" />
</h:form>
</div>
</div>
How can i achieve this?
You are misusing the forEach JSTL tag. The tag is only in effect when the component tree is built, and the component tree is not re-built for post-backs and AJAX requests.
bwright's suggestion to use a <p:dataTable> is good, but you could also use <ui:repeat> if you don't want to render an HTML table.
https://rogerkeays.com/jsf-c-foreach-vs-ui-repeat
The most important thing to understand about the JSTL tags in JSF is
that they do not represent components and never become a part of the
component tree once the view has been built. Rather, they are tags
which are actually responsible for building the tree in the first
place. Once they have done their job they expire, are no more, cease
to be, etc etc.
...
When is the view built?
Now that you understand that tag handlers are only effective when the
tree is built, the next logical question should be well, when is tree
built?
The short answer is that a new view is built for every request which
is not a postback. During a postback, the view is reconstructed from
saved state. Quite confusing, and not very obvious I know, but there
you have it.
...
My list doesn't change size after deleting or adding an item
When your view was built you only had, say, 5 items. If you post back
to this view and add or delete an item, your view still has 5
h:outputText components in it since it was restored from saved state.
In this simple case, you should use ui:repeat and your tree will
always contain one h:ouputText component which is iterated over with
differing values of ${item}.
If you rely on using c:forEach to dynamically include different form
components you could run into difficulty. Always try to think about
what the resulting tree looks like and remember it doesn't change on a
postback.
See also
https://rogerkeays.com/jsf-c-foreach-vs-ui-repeat (quoted above)
JSTL in JSF2 Facelets... makes sense?
I have a counter in a column of a datatable. Once the counter reaches a certain time, I need to change the background color of that column only. The data for the table is being pulled from a database. I'm using a4j:poll to reRender the column but the issue is that the entire table is rendered. Some code below:
<a4j:region>
<h:form>
<a4j:poll id="poll" interval="1000" enabled="true" reRender="blink" limitToList="true" />
</h:form>
</a4j:region>
<h:form id="form1">
<a4j:outputPanel id="panel1" ajaxRendered="true">
<h:dataTable id="blinks" styleClass="tableClass" value="#{bean.list}" var="_item">
<h:column id="blink">
<f:facet name="header">
<h:outputText value="Header1" />
</f:facet>
<div id="div1" class="#{bean.check() ? 'red' :''}">
<h:outputText value="Counter text (counts seconds)" />
</h:column>
</h:dataTable>
</a4j:outputPanel>
</h:form>
If you meet the following minimum req' JSF 2.0, EL 2.1 and Servlet 2.5
You can try out the Ajax#updateColumn() by Omnifaces , there is an example on how to use it in the showcase
Note that Ajax#updateRow() and Ajax#updateColumn() can only update
cell content when it has been wrapped in some container component with
a fixed ID.
Maybe you can use a push server side events to trigger the update on client side instead of use polling which performs full form.
http://livedemo.exadel.com/richfaces-demo/richfaces/push.jsf?tab=choices&cid=987178
A full description how to use this: Using RichFaces Push and DataTable Ajax Keys for Partial Tables Updates
you should re render by column id, but because you have data which coming from database, and it is a one list, can you confirm what you can do call which real can update one column?
This is a clumsy question!!! :)
Can this be made possible somehow? Can <p:dataTable> (whatever lazily loaded or otherwise) be updated without updating its headers (The contents (rows) inside the table along with the footer should be updated without updating the table headers)?
Updating of <p:dataTable> may be triggered by any UICommand like <p:commandButton>, <p:commandLink> and alike.
Something like this can be visualized, when we edit/update rows using <p:cellEditor> in conjunction with <p:rowEditor/> in <p:dataTable> (not sure about single cell editing).
<p:dataTable id="dataTable" var="row" value="#{bean}" ...>
<p:column headerText="Header 1" sortBy="#{row.property1}" filterBy="#{row.property1}">
....
</p:column>
<p:column>
<!--They may be our own headers-->
<f:facet name="header">
Header 2
...
</f:facet>
....
</p:column>
...
</p:dataTable>
Easiest way is to use PrimeFaces Selectors (PFS) for this. This only requires the desired cell content being wrapped in another component with an ID and a style class — so that jQuery can find and collect them.
E.g.
<p:dataTable ...>
<p:column>
<f:facet name="header">...</f:facet>
<h:panelGroup id="col1" styleClass="cell">...</h:panelGroup>
</p:column>
<p:column>
<f:facet name="header">...</f:facet>
<h:panelGroup id="col2" styleClass="cell">...</h:panelGroup>
</p:column>
<p:column>
<f:facet name="header">...</f:facet>
<h:panelGroup id="col3" styleClass="cell">...</h:panelGroup>
</p:column>
...
</p:dataTable>
<p:commandButton value="update" update="#(.cell)" />
That wrapping is clumsy, yes, but that's best you can get without homebrewing a custom renderer. You can always create a <my:column> tagfile to reduce the boilerplate.
See also:
How do PrimeFaces Selectors as in update="#(.myClass)" work?
I would like to be able to conditionally omit a footer from a PrimeFaces panel element:
<p:panel header="some text">
<f:facet name="footer">
#{message}
</f:facet>
<!-- ... -->
</p:panel>
I hoped that the rendered attribute would work:
<p:panel header="some text">
<f:facet name="footer" rendered="#{!empty message}">
#{message}
</f:facet>
<!-- ... -->
</p:panel>
But the footer is still rendered, with empty content. It appears that facet does not have the rendered attribute: http://www.jsftoolbox.com/documentation/help/12-TagReference/core/f_facet.html.
What's the right way to do this?
I was able to solve this by swapping the facet out for an attribute. To summarize:
This works
<p:panel ...>
<f:attribute name="footer" value="#{message}"/>
<!-- ... -->
</p:panel>
But this doesn't work
<p:panel footer="#{message}">
<!-- ... -->
</p:panel>
Neither does this
<p:panel ...>
<f:facet name="footer">#{message}</f:facet>
<!-- ... -->
</p:panel>
Nor this
<p:panel ...>
<f:facet name="footer">
<h:outputText value="#{message}" rendered="#{!empty message}"/>
</f:facet>
<!-- ... -->
</p:panel>
by "works" I mean:
"renders no footer — not just an empty footer — when #{message} is empty or null; otherwise, correctly renders the footer with the specified text."
PrimeFaces forum thread on this issue
You could declare a ui:param and let the template check the param while renderring.
The facet in the template could then be declared as:
<f:facet name="#{hideFooter == null or not hideFooter ? 'footer' : ''}">
#{message}
</f:facet>
Any page can then declare this param
<ui:param name='hideFooter' value='#{some rule}' />
and set the appropriate rule for the param. For any page that does not declare the param, the footer will be displayed.
Here's what I did in trying to conditionally render a facet within a composite component.
<composite:interface>
<composite:facet name="header" required="false" />
</composite:interface>
<composite:implementation>
<p:panel>
<c:if test="#{empty component.facets.header}" >
<f:facet id="#{cc.attrs.id}_default_header" name="header">
all sorts of stuff here
</f:facet>
</c:if>
<c:if test="#{not empty component.facets.header}">
<composite:insertFacet id="#{cc.attrs.id}_custom_header" name="header" />
</c:if>
<composite:insertChildren id="#{cc.attrs.id}_content"/>
</p:panel>
</composite:implementation>
This let's the user of the composite component supply the header facet if they want, and if they don't, we supply a default. Obviously, instead of providing a default, you could simply not do anything.
This mixes c:if in jsf controls, but we didn't see any adverse effects.
I have come across a similar issue with plain JSF. I am not sure how a <p:panel> is rendered, but if it is rendered as a table, you can try this:
First, declare a CSS-class like this:
.HideFooter tfoot {
display: none;
}
Then set that class conditionally on the panel:
<p:panel styleClass="#{renderFooterCondition ? null : 'HideFooter'}">
The footer is still rendered in the JSF-sense, but it is not displayed and does not take up any space in the page when viewed by the user-agent.
I successfully solved this problem using ui:fragment
<ui:fragment rendered="...Test...">
<f:facet name="footer">
...
</f:facet>
</ui:fragment>
works for example to conditionnaly render the footer of a primefaces datatable (the rendered attribute of the facet does not work).
Not sure how well this would work for your footer, but I had the same issue with a legend I was trying to conditionally render. I fixed it by using the rendered on anything inside the facet tag.
<p:fieldset>
<f:facet name="legend">
<h:outputText value="#{header1}" rendered="#{header1.exists}"/>
<h:outputText value="#{header2}" rendered="#{not header1.exists}"/>
</f:facet>
content
</p:fieldset>
I had difficulty trying c:if with my ui:repeat, so this was my solution. Not quite the same as your problem, but similar.
Facets are not intended to render HTML, which is why it doesn't have the rendered attribute. Facets add functionality to a page. The term facet is probably a poor choice of name. It's very ambiguous.
..if the list compiled by ITworld's Phil Johnson has it right, the
single hardest thing developers do is name things.
ie.
JSF facets
A project facet is a specific unit of functionality that you can add to a project when that functionality is required. When a project facet is added to a project, it can add natures, builders, classpath entries, and resources to a project, depending on the characteristics of the particular project. JSF facets define the characteristics of your JSF enabled web application. The JSF facets specify the requirements and constraints that apply to your JSF project.
The JSF facets supply a set behaviors and capabilities to your web application.
This is a counter-answer to the answer from Ludovic Pénet.
This worked for me in <f:facet name="footer"> in selected p:column items of a p:dataTable (Primefaces 5.3):
...
Note how I have the ui:fragment inside the f:facet, not outside (not wrapping) it. It definitely completely removes the entire row when every footer facet is tested to NOT render (as far as I can tell, independent of the content within the ui:fragment).
Try with this, from primefaces web page
<p:columnGroup type="footer">
<p:row>
<p:column colspan="3" style="text-align:right" footerText="Totals:" />
<p:column footerText="your value in ajax" />
<p:column footerText="your value in ajax" />
</p:row>
</p:columnGroup>
clik here, to view primefaces' webpage
For those who landed here trying to hide the footer, instead of header, but the syntax component.facets.footer didn't work, should try this:
<p:panel id="panelContent">
<c:if test="#{not empty cc.facets.footer}">
<f:facet name="footer" height="100%">
your content
</f:facet>
</c:if>
</panel>
Why don't you enclose the content of the footer into a panelGroup which has the rendered attribute?
This way:
<p:panel header="some text">
<f:facet name="footer">
<h:panelGroup rendered="#{!empty message}">
#{message}
</h:panelGroup>
</f:facet>
<!-- ... -->
</p:panel>
I do it in my weapp and it works, no footer is rendered.
I don't use primefaces though, I do it with h:datatable, but I think that it must works with p:panel too.
I try this solution and ok. (http://www.coderanch.com/t/431222/JSF/java/dynamically-set-panel-header-condition)
<rich:dataGrid value="#{myMB.student.list}" rendered="#{!empty myMB.student and !empty myMB.student.list}" var="st" rowKeyVar="row">
<rich:panel>
<f:facet name="header">
<h:panelGroup id="panelHeader">
<h:outputText value="Just one student" id="header1" required="true" rendered="#{!myMB.manyStudents}"/>
<h:outputText value="#{row+1}º Student" id="header2" required="true" rendered="#{myMB.manyStudents}"/>
</h:panelGroup>
</f:facet>
<rich:panel>