I have a problem getting AJAX and a h:selectOneMenu to work together. I have a select box and when the user selects an entry, then I would the value inserted into myFacade.secondaryAttribute and then re-render the panelGroup called details.
I've found a lot of threads about this, and I have tried converts, change listeners and nothing works :-( If I add a commandButton and attach ajax to this - then I get a server error.
serverError: class java.lang.NullPointerException
My code snippet:
<h:form>
<h:panelGroup layout="block" styleClass="dropdown">
<h:selectOneMenu value="#{myFacade.secondaryAttribute}" id="secondaryAttribute">
<f:selectItems value="#{myFacade.attributes}" var="attribute" itemLabel="#
{attribute.description}" itemValue="#{attribute}"></f:selectItems>
<f:ajax event="change" render=":details"></f:ajax>
</h:selectOneMenu>
</h:panelGroup>
</h:form>
<h:panelGroup id="details">
...
</h:panelGroup>
I hope that someone has an idea as to what I'm doing wrong - or whether this is not possible at all (found some forum threads saying that you cannot use ajax with h:selectOneMenu?)
Thanks in advance.
/Søren
Related
I am having some issues with my <h:dataTable> where I cannot get it to update/refresh upon submitting an <f:ajax> request which, resides within this table component. The <f:ajax> listener attribute triggers a specific row to be removed from the <h:dataTable>. Could someone please assist me in getting this to work.
Code fragment from my JSF page:
<h:dataTable id="table1">
<h:column>
<f:facet name="header">Object Name:</f:facet>
<h:outputText value="#{object.name}"/>
</h:column>
<h:column>
<f:facet name="header">Action:</f:facet>
<h:form>
<h:commandButton value="Delete">
<f:ajax listener="#{objectBean.delete(object.id)}" render=":table1"/>
</h:commandButton>
</h:form>
</h:column>
</h:dataTable>
I have also tried to wrap this <h:dataTable> component within a <h:panelGroup> component and it still did not work unfortunately. Any tips on getting this to work?
Refer to : Datatable not rendering with ajax call in jsf
Move your to wrap the whole datatable, check your network traffic in chrome F12 to see what the sent/returned response is and see if its giving you back the right table to update.
In my JSF application if I refresh the page everything get's rendered exceted the primeface graphicimages and jsf <f:ajax /> isn't working. If I wait 5 seconds the ajax calls are working again and graphicimages are getting loaded.
Another example is when I upload an image. The image get procced, uploaded and the site get's refreshed. After this the image is displayed, but ajax calls won't work after a few seconds after.
The app runs on a JBoss 7.1 with JSF 2.1
Is this a problem with slow hardware or something else. I would be happy with any hints because I don't really know where to look for a solution.
Example:
<p:selectOneRadio id="options" value="#{gameWriter.uploadCover}">
<f:selectItem itemLabel="ja" itemValue="true"/>
<f:selectItem itemLabel="nein" itemValue="false"/>
<f:ajax/>
</p:selectOneRadio>
When you define the f:ajax, try to give the UI components you want to execute and update. Also give the event. If you want process the whole form and update the whole page, you can use #form and #all in the f:ajax.
An example with #form and #all with f:ajax is as follows.
<h:form>
<p:selectOneMenu id="cmb" value="#{investigationItemController.current}" >
<f:selectItem itemLabel="Please select an item" />
<f:selectItems value="#{investigationItemController.items}" var="ii" itemLabel="#{ii.name}" itemValue="#{ii}" />
<f:ajax event="change" execute="#form" render="#all"/>
</p:selectOneMenu>
<h:outputLabel id="lbl" value="#{investigationItemController.current}" />
</h:form>
An example with primefaces ajax command is as follows.
<h:form>
<p:selectOneMenu id="cmb" value="#{investigationItemController.current}" >
<f:selectItem itemLabel="Please select an item" />
<f:selectItems value="#{investigationItemController.items}" var="ii" itemLabel="#{ii.name}" itemValue="#{ii}" />
<p:ajax event="change" process="cmb" update="lbl"/>
</p:selectOneMenu>
<h:outputLabel id="lbl" value="#{investigationItemController.current}" />
</h:form>
We can add more than one or for one UI Component if we want to execute the logic for more than one event.
Events for standard JSF UI component can be taken after removing the 'on' from the list of attributes of the UI component starting with 'on'. For example if JSF UI support onChange as an attribute you can use event="change".
For primefaces UI components, the possible events are listed under Primefaces documentation.
It is essential to correctly select the event in order for a successful ajax response.
I have a problem using ui:repeat nested in each other where I'd like to call a listener. I have also tried c:forEach instead, but got the same problem.
For demonstrating the problem I have simplified the code to the problem.
There are two buttons, the first inside the first ui:repeat, calling successful a simple listener. The second button is inside the nested ui:repeat element, should call the same listener as the first button, but the listener is never called.
Can you please tell me whats wrong with this?
<div>
<ui:repeat var="testList" value="#{testBean.testList}">
<h:commandButton value="test1">
// the listener is called if I click this button
<f:ajax event="click" execute="#this" listener="#{testBean.testListener}" />
</h:commandButton>
<ui:repeat var="nestedList" value="#{testList.nestedList}">
<h:commandButton value="test2">
// the listener will not be called if I click this button
<f:ajax event="click" execute="#this" listener="#{testBean.testListener}" />
</h:commandButton>
</ui:repeat>
</ui:repeat>
</div>
This is a known Mojarra issue related to broken state management of <ui:repeat>. Specifically this issue is reported as issue 1817 and fixed since Mojarra 2.1.15.
Upgrade your Mojarra version. It's currently already at 2.1.19.
I have a JSF search command button and a tomahawk dataTable that showing the result from a search. When clicking on the command button, the dataTable should output the search result. Anyway, since I use the JSF Ajax, the dataTable doesn't show. I am just wondering whether JSF Ajax cause the problem?
Here is the problematic code that cause the table now render:
<h:commandButton id="search" value="#{msg.Label_Search}" action="#{theBean.doSearch}">
<f:ajax render="searchStatus" execute="#form" />
</h:commandButton>
<h:outputText id="searchStatus" value="Loading data now..." rendered="#{theBean.searchingNow}" />
<h:panelGroup id="searchResultTable">
<t:dataTable ... />
</h:panelGroup>
*Take note on this. If the ajax code were removed. It is working fine.
You're only updating the searchStatus, not the searchResultTable when the ajax request completes. So the enduser will indeed never see a visual change in the HTML representation of the searchResultTable.
Fix the <f:ajax render> accordingly so that the searchResultTable is also really updated:
<f:ajax render="searchStatus searchResultTable" execute="#form" />
I want the following form to use AJAX. So the comments are shown after clicking the command button and without reloading the page. What needs to be changed, using Java Server Faces 2.0?
Functionality: This form provides an inputText to define a topic. After pressing the commandButton, it is searched for comments regarding this topic. Comments are shown in a dataTable, if there are any. Otherwise Empty is shown.
<h:form id="myForm">
<h:outputLabel value="Topic:" for="topic" />
<h:inputText id="topic" value="#{commentManager.topic}" />
<h:commandButton value="read" action="#{commentManager.findByTopic}" />
<h:panelGroup rendered="#{empty commentManager.comments}">
<h:outputText value="Empty" />
</h:panelGroup>
<h:dataTable
id="comments"
value="#{commentManager.comments}"
var="comment"
rendered="#{not empty commentManager.comments}"
>
<h:column>
<h:outputText value="#{comment.content}"/>
</h:column>
</h:dataTable>
</h:form>
You need to tell the command button to use Ajax instead. It's as simple as nesting a <f:ajax> tag inside it. You need to instruct it to submit the whole form by execute="#form" and to render the element with ID comments by render="comments".
<h:commandButton value="read" action="#{commentManager.findByTopic}">
<f:ajax execute="#form" render="comments" />
</h:commandButton>
Don't forget to ensure that you've a <h:head> instead of a <head> in the master template so that the necessary JSF ajax JavaScripts will be auto-included.
<h:head>
...
</h:head>
Also, the element with ID comments needs to be already rendered to the client side by JSF in order to be able to be updated (re-rendered) by JavaScript/Ajax again. So best is to put the <h:dataTable> in a <h:panelGroup> with that ID.
<h:panelGroup id="comments">
<h:dataTable rendered="#{not empty commentManager.comments}">
...
</h:dataTable>
</h:panelGroup>
See also:
Understanding PrimeFaces process/update and JSF f:ajax execute/render attributes
How to find out client ID of component for ajax update/render? Cannot find component with expression "foo" referenced from "bar"
You need to modify your button:
<h:commandButton value="read" action="#{commentManager.findByTopic}">
<f:ajax render="comments" />
</h:commandButton>
This means, when the button is clicked, the action is executed, and the dataTable will be rendered and updated. This only works if the backing bean is at least view-scoped.