I have a page with a file upload input from tomahawk's components. I want to know if putting 5 upload inputs with a single button those will be sent as part of the form.
And I want also some ideas on how I can make my managed bean to adapt for this multiple file upload.
Thanks in advance.
I think you can just simply map each file to different variables in your backing bean. When the user clicks submit button, you can get all your files from these variables at 1 go.
PrimeFaces' upload component manages multi-upload.
Related
I have 3 log files and a selectone Menu.Based on the selection, the last part of any one of the log file needs to be displayed dynamically.Which PrimeFace component will do this and how.
There is no stand alone component for this in primefaces, you should use a few basic principals.
Read the last lines of a log file, you may see this question Java IO implementation of unix/linux "tail -f"
When reading file you should store the lines read to a collection of strings in your managed bean
On selection of your selectOneMenu, you should change your filename and regenerate your collection, again on the same managed bean.
On ajax complete event of your selectOneMenu ("update" attribute), you should update a jsf display component which links to your collection.
Is it possible to set current displayed tab programmatically in <p:wizard>?
For example, I want that for two different request to the same page which contains a wizard, to have a different tab selected.
What I am currently trying to do, is to have a wizard with many tabs, in the second tab I have a redirection to another page, so when I come back I want to come to the last step which caused the redirection.
Can you please help me ? Thank you a lot !
According to primefaces documentation there's a step attribute for p:wizard tag, which specifies the step of the wizard you're currently in.
attribute: step
default value: 0
type: String
description: Id of the current step in flow
You must bind this attribute to a value of your backing bean and maintain it during redirection and coming back. If your wizard's bean is #ViewScoped you'll loose that info during redirection step, so you have to pass it using a view param or flash scope.
My answer would most probably not meet your complete requirements, but, nonetheless, it may point you towards solution to your problem.
As far as I know, the PrimeFaces Wizard UIComponent is designed for a workflow of one page. That effectively means that inputs will be handled by a backing beans that is in a view scope.
This way, making a redirection on a certain step will clear all data inputs, because your view changes and the old one is destroyed.
Anyway, a means of setting a current tab for display is step attribute of Wizard component. So,
<p:wizard step="#{wizardBean.currentStep}" >...</p:wizard>
will force the wizard to show you step which you specified in your bean. You may be able to get it by using, for example, a view parameter, like in
<f:viewParam name="step" value="#{wizardBean.currentStep}" />
But it will make sense if lifetime of your bean is more that for a view, for example, the bean could be put in session scope.
That said, maybe it is a better idea to do login beforehand. Or, if it is absolutely necessary to do it in step 2 of your wizard, provide for a built-in login functionality in a page itself, or in a popular window?
Also, programmatically the setting you speak of can be achieved via a binding of component to your backing bean and setting the step value in the backing bean, for example, in a preRenderView event.
I am very new to JSF. I have the following requirement:
On click of a commandButton, call a backing bean method to check if there is some data present satisfying the condition.
If yes, confirm from user for overwrite.
If user says OK, call the same method of backing bean with some parameters set to tell the program to overwrite the data.
What I am doing is:
having action of the commandButton as the method name.
in the backing bean method, check if we have come with certain condition, check if the data is already present.
If yes, go back to page and ask for confirmation.
If confirmed, call the click method of the button.
The problem is, when I come back to the page, the inputFileUpload component on the page loses its value.
What can I do to achieve this? Please help.
This is fully by HTML specification and completely outside control of JSF. It's by HTML specification for security reasons not possible to (re)display the value of a HTML input file field with a value coming from the server side. Otherwise a hazard scenario as shown in this answer would be possible.
You need to redesign the form in such way that the input file field is not been updated during confirmation. You can use among others JavaScript/ajax for this: just submit the form by ajax and make sure that the input file field is not been updated on ajax response.
I use the primesfaces p:fileUpload tag, witch works fine. But I need to be able to ad a description to the files I upload. How can I do this?
I added a textfield on my page and assigned it to a bean property. But how Can I update it when pressing the primefaces upload button? (The fileUpload is ajax, so not the entire form is submitted. I don't want to submit the whole form because I don't want validation errors when uploading files)
Or should I need to use another tag (other library)?
Roel
I am trying to implement an audit trail functionality for my web application that records:
lastModified (timestamp)
modifiedBy (user information)
userComment (reason for value change)
for each of my input fields (input fields are spread over several forms with different backing beans and different valueHolder classes).
The first two (lastModified and modifiedBy) are easily done with the help of an JPA AuditListener and #PrePersit and #PreUpdate methods.
The third one is a bit tricky since it requires user interaction. Best would be a dialog that asks for the user comment.
So there are (at least) two open issues: Can I establish a "global" valueChangeListener for all input fields in my application? Is this possible without attaching <f:valueChangeListener> to each single input component? Second: How can I grab the user comment. My idea is to put a p:dialog in my web page template but this dialog needs to know from which input component it is called.
Can I establish a "global" valueChangeListener for all input fields in my application? Is this possible without attaching to each single input component?
Yes, with a SystemEventListener which get executed during PreRenderViewEvent. You need to walk through the component tree as obtained by FacesContext#getViewRoot() to find all components which are an instanceofEditableValueHolder (or something more finer-grained) and then add the new YourValueChangeListener() by the addValueChangeListener() method. See also this answer how to register the system event listener: How to apply a JSF2 phaselistener after viewroot gets built?
Second: How can I grab the user comment. My idea is to put a p:dialog in my web page template but this dialog needs to know from which input component it is called.
You could in YourValueChangeListener#processValueChange() set the component in question as a property of some request or view scoped which you grab by evaluateExpressionGet().
Recorder recorder = (Recorder) context.getApplication().evaluateExpressionGet(context, "#{recorder}", Recorder.class);
recorder.setComponent(event.getComponent());
// ...
It will execute the EL and auto-create the bean in its scope if necessary. The bean in turn should also hold the property representing the user comment. Finally, you can use it in your <p:dialog>.
<p>You have edited #{recorder.component.label}, please mention the reason:</p>
...
<h:inputText value="#{recorder.comment}" />