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.
Related
I'm trying to ajax-update a conditionally rendered component.
<h:form>
...
<h:commandButton value="Login" action="#{login.submit}">
<f:ajax execute="#form" render=":text" />
</h:commandButton>
</h:form>
<h:outputText id="text" value="You're logged in!" rendered="#{not empty user}" />
However, that does not work. I can assure that #{user} is actually available. How is this caused and how can I solve it?
It's not possible to re-render (update) a component by ajax if the component itself is not rendered in first place. The component must be always rendered before ajax can re-render it. Ajax is using JavaScript document.getElementById() to find the component which needs to be updated. But if JSF hasn't rendered the component in first place, then JavaScript can't find anything to update.
The solution is to simply reference a parent component which is always rendered.
<h:form>
...
<h:commandButton ...>
<f:ajax ... render=":text" />
</h:commandButton>
</h:form>
<h:panelGroup id="text">
<h:outputText ... rendered="#{not empty user}" />
</h:panelGroup>
See also:
Why do I need to nest a component with rendered="#{some}" in another component when I want to ajax-update it?
How to find out client ID of component for ajax update/render? Cannot find component with expression "foo" referenced from "bar"
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
I have the followig form with a dataTable and a edit section with input fields to manipulate the table data. I want to refresh the datatable after a the commandButton was clicked:
<f:ajax>
<h:panelGroup id="timesheet_panel">
<h:dataTable id="datatable"
value="#{timesheetController.myTimeSheet}" var="child">
......
<h:column>
<!-- update editor panel data -->
<h:commandLink
action="#{timesheetController.load(child.item['$uniqueid'])}">
<h:outputText value="#{message.edit}" />
<f:ajax
render=":#{component.parent.parent.parent.parent.clientId}:editorpanel" />
</h:commandLink>
</h:column>
</h:dataTable>
<!-- Editor -->
<h:panelGroup id="editor">
<h:inputText value="#{timesheetController.workitem.item['_category']}" />
<h:commandButton action="/mypage"
actionListener="#{timesheetController.process('10')}"
value="Update Tabledata">
<f:ajax render="datatable" />
</h:commandButton>
</h:panelGroup>
</h:panelGroup>
</f:ajax>
Note: I have a h:column with a h:commandLink to update the data shown in the editor panel below the table.
The question is: why is it necessary to provide the action property for the commandButton in the editor panel? If I did not provide the action property the f:ajax render="datatable" will not refresh the datatable.
So it seems to me that only a actionListener can be used here to update backend data. A action method will only work if the result of the action is equal to the current page.
Can anybody explain this behavior?
I am working on GlassFish 3.1.2
To refresh the table you need to put your bean in #ViewScoped at least. Ortherwise, your beed will be recreated after values are set so you'll get to same point.
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.