I am new to JSF framework and Facelets as view, I am stuck with a problem now. I have got a page where i show some dropdown menu using <h:selectOneMenu> tag. On each selection i used to fire an ajax event using <f:ajax> event it all are working fine. But my problem is, if i select an option 2 on a select box and if I reloads the page again that particular select box will be selected with option 2 by default. I dont need this. I have to reload the select boxes along with page refresh. Please help me to solve this issue.
The selectbox shows the option that is set in the backing bean (and bound by the value attribute of <h:selectOneMenu>). The behavior after a page refresh depends on the scope of your backing bean. If it is session scoped, a page refresh doesn't reset the bean. You could change the scope to #ViewScoped to get the desired behavior. The bean then will be recreated after a full request.
Just set null to backing bean property that used in selectonemenu value after the selected action or set default value in property get method.
Related
Lets say I have a #ViewScoped Bean behind my current page A. Now the user navigates to page B via a normal get request, lets say to www.google.com.
When the user clicks the back button of the browser, I would like to restore the #ViewScope of the previous page, so that it appears exactly as it was left. Is that possible to achieve somehow?
I dont want to make my page A #SessionScoped so that the backing beans do not disturb each others state when opened in two browser tabs.
Since version 2.6 OmniFaces has this feature, is called #ViewScoped(saveInViewState = true) But with some caution!
It's very important that you understand that this setting has potentially a major impact in the size of the JSF view state, certainly when the view scoped bean instance holds "too much" data, such as a collection of entities for a data table, and that such beans will in fact never expire as they are stored entirely in the javax.faces.ViewState hidden input field in the HTML page. Moreover, the #PreDestroy annotated method on such bean will explicitly never be invoked, even not on an unload as it's quite possible to save or cache the page source and re-execute it at a (much) later moment.
A more programmatical solution is the #ConversationScoped. With the convertsation id as parameter can you restore the view.
conversationscope example
Yes it is possible, pass parameter like this using f:param this will pass your parameter to the next screen.
<h:commandLink action="screenName" value="#{search.participantName}">
<f:param value="#{searchcus.participantId}" name="PARTICIPANT_ID"/>
<f:param name="PARENT_SCREEN_CODE" value="SEARCH_PARTICIPANT"/>
</h:commandLink>
After that in init() method get value as a parameter to fetch the result.
I am using a master template (i.e. <ui:composition template> / <ui:define>) where I have a navigation panel on the left, and the content panel in the center. When I go to one of my pages that is #ViewScoped, I edit some of the fields, go to another page which reloads the content area, and then go back to the original page, and the fields are all still populated with data. This implies that the view never ended. I tried #RequestScoped which produces the results I want, but breaks all of the ajax in the page related to that bean.
What is the best way to reset a page to its original state?
Can anyone see what is happening, exactly, regarding my layout and content area (consisting of a ui:include) being updated that would cause this not to be considered a change of View?
By navigating the content of the page using a backing bean, a ui:include updated by ajax, all in the same page, JSF's current view never goes out of scope, which is why the backing ViewScoped beans are never reset after navigating.
One possible fix for this is to redesign the page to use traditional navigation. In other words, lets say you have several p:menuitems. Rather than assigning the actionListener to some backing bean function that sets the content page (followed by an update of the panel containing the ui:include), you would set the "action" of each menuitem to the page to which each corresponds. This has the effect of causing a page to be loaded when a menuitem is clicked.
This generated the requirement that I had to reorganize my template a little so that every page of my site was embedded in it. There's a little bit of flicker as the entire page reloads, but the beans are being reset accordingly.
I have a jsf page which has a selection popup. User can select the members from this popup and click on 'Add'. After that, the selected members will be displayed on main page. This popuup is opened and closed through javascript and page doesn't refresh in this process.
Now the question is how can I take these selected members up-to backing bean? can I attach them to backing bean property directly?
I have a variable in backing bean that needs to get reset to null whenever the associated page is opened using the relevant menu link. Is there a way to run a initialization code in the backing bean whenever the relevant menu link is clicked? Contsructor runs only the first time the menu link is clicked. I guess the bean is then retained in the jsf context and is not getting recreated. Is there a way to ensure a new object of that backing bean is created each time the menu link is clicked? Thanks!
Couldn't you just put the bean in request scope?
Another option would be to use a setpropertyactionlistener on the menu. When the menu is clicked, set the value to "null".
You have the following options:
1 . Change the bean to the request-scoped bean
2 . Use the action attribute to call the method on the backing bean to run the initialization code whenever the link is clicked , something like this:
<h:commandLink action="#{myBean.init}" value="My Link" />
And myBean.init() contains the initialization code
I have a situation where clicking a link in one column on the datatable opens A update FORM in the same page. The problem is when I hit the submit button for update, the render is set to false again of that update panel which was previously set true by parameter passed clicking the link.
I tried htmlhiddenInput and did setValue and getvalue but the value is lost. Is there any way I can save that parameter send from link, when clicked, even after submitting the form.
I achieved it doing session but I dont wanna use session.
Any help is appreciated, thanks.
If you're on JSF 2.0, declare the bean #ViewScoped. If you're yet on JSF 1.x, then install Tomahawk and use <t:saveState> to retain the bean property or even the entire bean in the subsequent request. E.g.
<t:saveState value="#{bean.renderTable}" />
or
<t:saveState value="#{bean}" />