I have a JSF page with a form. The submit button is an <h:commantButton> with an action that calls a backing bean function, which in turn does some calculations and then returns a string which is the name of the next page to view.
This works as expected. On this page is an <h:link> with an outcome of another JSF page. When on this third page if the user clicks the browser back button they are taken to the first page with the form and not the second page. Why is this? I should mention that the backing bean is session scoped.
Thanks,
Doug
This is normal, if you verify your URL, you will see that it doesn't change when you click on the h:commandButton. If you want it to change correctly in the first place, you can modify your action like this : youraction?faces-redirect=true.
More info :
JSF : Page Forward vs Page Redirect
Related
How is navigation from a Facelet page
<p:commandLink action="xyz.xhtml">
or a backing bean
<p:commandLink action="#{bean.redirect}">
public class Bean{
public String redirect(){
.....
return "xyz.xhtml";
}
}
different from each other?
How is navigation from a xhtml page or a backing bean different from each other.
There's no difference. The both examples invoke a POST request and instructs JSF to render the view associated with the given outcome. The backing bean method has the only advantage that it allows you to perform some business logic beforehand or even control the outcome value programmatically.
However, if you don't have any business logic at all and solely want to have an idempotent link to another page, then using a command link is actually a bad practice. Using POST for page-to-page navigation is not user nor SEO friendly. The target page is not bookmarkable (the URL remains the one of the page where the POST form was been submitted to) nor searchbot-crawlable (it is using JavaScript to submit a hidden form).
You should instead use a normal link.
<h:link outcome="xyz.xhtml">
This generates a SEO-friendly <a> element with the full URL in its href and ends up in an user-friendly bookmarkable URL.
See also:
When should I use h:outputLink instead of h:commandLink?
How to navigate in JSF? How to make URL reflect current page (and not previous one)
Check out the documentation of p:commandLink here, which says the following for action attribute:
A method expression or a string outcome to process when command is
executed.
Now, as action="xyz.xhtml" returns String xyz.xhtml you're redirected accordingly and for action="#{bean.redirect}" which again returns xyz.xhtml you are again redirected according to the returned String.
How to check the previous page in mvc 3 application.
Previous Page.
On click of the above link I have to go back to previous page.
How to do this ?
This will depend on how is the navigation organized on your website. One possibility is to use the history.go(-1) javascript function which will simply simulate the browser back button:
Previous Page.
Another possibility is to have the calling page pass a ReturnUrl query string parameter to this page which could be used to construct the link:
Previous Page.
Of course this assumes that when you called the controller action that rendered this view you have passed the ReturnUrl query string parameter.
Same as Matthew's answer but using a session variable. That way you could update it selectively in the Action you want. For example, on a POST action you wouldn't want them to go back to that view with form values there. What you really want is for them to go back to the page before that.
public ActionResult MyNextPage(string prevUrl)
{
Session["prevUrl "] = prevUrl;
View();
}
Then in the View:
Previous Page
Note that if session is expired or null it will throw an exception.
I need help. I'm new to JSF and im using JSF2 and richfaces in my project.
I want to clear the form for which I'm using <f:ajax render="#form"/> in refresh button. I have an ADD button on that screen which adds one record and I hit refresh then it's going to the default page. But when I once again go to enter a record then those values which I entered earlier remain in the form fields.
Can anyone please help me out with this issue?
Assuming that you mean the browser's refresh button when you say "I hit refresh", then that can happen if you've incorrectly placed the bean holding view scoped data in the session scope. You're then basically reusing the very same bean as the form is previously been submitted to. Putting the bean in the view scope instead of the session scope should fix this problem. The view scope ends when you navigate to a different page or fires a new request (as by hitting browser's refresh button).
See also:
How to choose the right bean scope?
Update if you're due to bad design restricted to using session scope, then you might want to hack this around by a
<f:event type="preRenderView" listener="#{sessionScopedBeanWhichShouldActuallyBeViewScoped.resetModel}" />
with
public void resetModel() {
if (!FacesContext.getCurrentInstance().isPostback()) {
model = null;
}
}
This will clear the model on every GET request. However, regardless of this hack, you'll still run into serious problems when the enduser opens the same view in a different browser tab/window within the same session.
The right solution is to put the bean in the view scope instead of the session scope, as said earlier.
I added a filter in my struts 2 application. I am using this filter to check cookie values. If appropriate cookie is found then i want to redirect user to home page rather than normal login page.
So for displaying home page I want to call struts 2 action associated with home page.
I tried calling homepage.execute() method from filter, but this does not display the result(jsp page) associated with home page.
Please suggest me some way to call homepage action from fiter class.
I don't know what your requirements are, but usually using a Struts 2 interceptor is a better idea.
Anyway you can't invoke action directly from Java because it would not trigger the framework stuff. Instead you should consider to redirect to the mapped url of the action (for example: response.sendRedirect("http://your_host_name/your_action_name.action") )
is there a way to get or store the last page visited? Example if I'm on a List Page with a New link that loads a page with form. If the user cancels, you go back to the previous page (List Page).
Thanks
Well, in web forms, you would use: Request.UrlReferrer
http://msdn.microsoft.com/en-us/library/system.web.httprequest.urlreferrer.aspx
So I assume you can also use that in MVC, accessible through the HttpContext property of the RequestContext acessible by teh controller.