I have an ArrayList in a backing bean and his rendering in JSF page with c:forEach. When iI remove the ArrayList element by index, jsf, no matter what index is, always removes the last element. Why happening this?
Remove button in JSF is :
<a4j:commandButton immediate="true" action="#{bean.removeEntry}" ...
So i use immediate attribute. I think problem is because immediate skips Apply request phase in JSF Life Cycle. Is possible?
If yes, than how run Apply request phase in this case ?
Are you using Facelets (.xhtml pages)? If so, you may be running into some common misconceptions about JSTL tags like <c:foreach>. Here's a good article on it:
https://rogerkeays.com/jsf-c-foreach-vs-ui-repeat
Basically, <c:foreach> is processed only when the view is initially built; it does not become part of the component tree, and can have some behavior you don't expect when the backing collection is changed. You may be better off using <ui:repeat> instead.
little more code would have helped, but immediate on command button is basically used for navigating away from current page as actionlistener or action will execute in apply request phase, typical case cancel button. This means you will not get updated value there.
If your logic depends on some other uiinput make that immediate and you can hook things in valuechangelistener.
But I doubt what you are trying to achieve can be done in better way, have a look at this link # SO
I was having the similar issue. I was using 'tr:iterator' to iterate over ArrayList'<'Customer'>'(); 'ui:repeat' solved my problem.
Thanks.
Related
I have a problem I can't quite get a handle on.
First the context: I am developing a web application using Primefaces 3.5 (yes, unfortunately I am stuck with this old version for now), running on JBoss 7.
There is a form with id "form" encompassing all following xhtml code.
I have a component in my view which is provided by usage of the binding attribute:
<p:dashboard id="dashboard" binding="#{myBackingBean.dashboard}" />
Then sometimes I would like to perform an ajax update on this component, this is done by using the RemoteCommand component of primefaces:
<p:remoteCommand
actionListener="#{myBackingBean.someActionListener()}"
process="#this" id="myRmtCmd" oncomplete="myJsFunction();"
update=":form:dashboard" name="myRemoteCommand" />
The RemoteCommand is triggered by a clicking on a Link:
Some Text
This works pretty well so far. However after deploying this code to production I sometimes get a FacesException:
javax.faces.FacesException: Cannot find component with identifier ":form:dashboard"
referenced from "form:myRmtCmd".
This is where my problem lies because I cannot reliably reproduce this exception. My question is this: What could lead to this exception being thrown? It seems to work 95 % of the time but being the perfectionist I am (and many of you reading this are as well, I'm sure ;) ) I would like this code to work 100 % of the time. What am I missing?
Before answering please consider these constraints:
yes, i have to use the binding attribute for providing the dashboard as I need a great deal of control over what gets added to the component
to avoid using IDs I also tried updating the dashboard by its css class via one of primefaces' advanced selectors: #(.ui-dashboard) - this also does not work!
yes, it would be possible to use a commandbutton/link instead of wiring up the remotecommand component to a simple html link but in this case the link is rendered by a JSF renderer component and I made some bad experiences with dynamically adding buttons etc (due to JSF Spec Issue 790)
Cheers,
p.s.
I also had this weird behavior.
There are probably more than one component bindded to #{myBackingBean.dashboard}, so the first one sets the id and there will be no one called "dashboard".
I wrote two pages...one a form where data submitted and second just to confirm the transaction actually carried out some calculation.
I have a managed bean i.e. FormDataBean and a class Reservation.java from which i instantiate for each booking made. Now I have at the end of a form a submit button:
<h:commandButton value="Submit" action="confirmation"/>
in the bean I have setters and getters as usual. in a method i defined I create an instance of Reservation, then set the beans variables to the instance variabels, like
reservation.startDate = startDate;
reservation.endDate = endDate;
reservation.checkRange();
The last method, i.e. checkRange() will use the assigned values to instance variables to carry calculation. it should return a string successful or failure.
Now when I enter data in the form, and press submit, it just refreshes the page but nothing is submitted. because it doesn't go to next page :(
Any idea what is happening? I don't need to define a navigation rule, because in other project, I carry out simple calculation and display result in next page and it worsks! Please advice
Thanks,
Your are missing to tell us some of the more important details so the answer is a kind of guesswork.
As you don't use navigation rules I assume you are using JSF 2, aren't you?
With JSF 2 you can directly set the new navigation target, without navigation rules. A forward to "confirmation" should work if your outcome file is named confirmation.xhtml. Check that. With a navigation rule you could forward it do a different file.
This part should work regardless of the rest.
For the bean not getting any values make sure that you are using the correct scope either through annotation or entry in your faces-config.xml. As you have a quite unusal validation mechanism you probably have to use the session scope.
The correct way would be using an actionlistener that does your checks and then sets the navigation depending on your checks. The bean scope could be more restrictive then.
Did you try action="confirmation?faces-redirect=true"?
action method is not called Please refer to this question - , One of my UICommand Component is rendered conditionally , it was said in the answer of the linked question - point 5 - that if the Component's or any of its parents rendered or disabled attributes are false - then the action method will not be called ? If thats the case- How do i achieve the same functionality? Is there a work around ? or a trick ? or any other approach ?
Thanks!
To the point, you'd like to retain the property responsible for the rendered condition in the subsequent request. There are several solutions for this problem:
Put bean in session scope. It's easy, but it hurts. It's bad for user experience since changes will be reflected in all tabs/windows the user has open in the same session.
Use <h:inputHidden> to transfer the property. In theory easy, but in practice it hurts as well. The value will namely get lost whenever a validation/conversion error has occurred in any of other inputs in the same form. This is an odditity in how JSF handles hidden input elements. A workaround is to use <h:inputHidden binding="#{bean.hidden}"> and do a hidden.getValue() and hidden.setValue() in bean.
If you're using <h:commandLink> instead of <h:commandButton>, then you can use <f:param> to transfer the property. It will be available as request parameter, you can check for it in bean's (post)constructor.
Use Tomahawk's <t:saveState>. The perfect solution as far. This will retain the value (or even a complete bean) in the subsequent request.
If you're already on JSF 2.0, the #ViewScoped would have solved this all. It behaves like the <t:saveState>.
See also:
commandButton/commandLink/ajax action/listener method not invoked or input value not updated
The trick is to have 'rendered' evaluate to true when it is time to run the action and then change the condition to false in the action method.
Let's say you have a link rendering based on a boolean in your bean called 'editing'. Then your action would look something like this:
public String myAction() {
// whatever you want your action to do
editing = false;
}
Edit: this assumes that the bean is either session scoped or the boolean get propagated between requests.
In my case, Javascript came for rescue, Which means, whatever was to be displayed conditionally , put them in a HTML Portion and don't display them display: none until the desired event occurs.
HTML Portion can have any JSF Tags(including CommandButtons) as you wish and would work (invoking the action methods and the stuff )perfectly okay.
I have One Jsf form that contains 2 Beans. First Bean scope: Session. Second Bean scope: request.
When some values are added via First Bean to second Bean, the updated value is not displayed in the form. I don't know how to do. Please help me.
Either you fired a redirect which caused the request scoped bean being renewed, or the values are updated at the wrong moment which caused them being overridden later in the JSF lifecycle.
To fix the first, ensure that you aren't including <redirect/> in navigation case nor did call ExternalContext#redirect() in bean action method. To fix the second, well, run a debugger. This article may also help a lot in understanding what's going on under the JSF hoods.
BalusC has shown what are the possible reasons for this problem.
In case it is the redirection one, removing the redirect solves the problem, but adds another - the user is asked to resubmit the form if he refreshes the page.
A preferred way to achieve such transitions from one page to another is to use a conversation. MyFaces Orchestra provides a special conversation scope to solve this and many more problems.
I have a problem with selectInputDate:
I have a backing bean which I am binding to the selectInputDate. I have a menu which, when the menu changes, I set the date to now to the same property the selectInputDate is bound to.
For some reason, the date changes correctly, but the selectInputDate then calls a set and overrides the value with the old value...
Any idea why selectInputDate would call the setter?
<ice:selectInputDate popupDateFormat="dd-MMM-yyyy" renderAsPopup="true" value="#{dateContoller.date}"/>
<ice:selectOneMenu value="#{dateContoller.dateRange}" valueChangeListener="#{dateRangeDateContoller.dateRangeChanged}" >
....
</ice:selectOneMenu>
(dateRangeChanged sets the current date to now)
The valueChangeListener is intend to run some code logic whenever the newly submitted value differs from the original value. But you're apparently actually not interested in the change of the value, you're actually interested in resetting the submitted value.
Just get rid of the valueChangeListener and do your thing in the bean's action method.
If that is not an option for some reason, then you need to elaborate more about the problem for which you thought that using a valueChangeListener is the right solution. There may be workarounds to keep the valueChangeListener anyway, such as calling FacesContext#renderResponse(), so that JSF won't run the update model values (and invoke action!) phases anymore, or using ValueChangeEvent#queue() to let it re-execute itself during invoke action phase.
To learn a bit more about the JSF lifecycle and when/why/how the one and other get called/invoked, you may find this practical article useful.