RF4. Obtaining URL parameters

[sukharevd]

Let's say I have a page which should contain different data-grid in accordance with the parameter of URL (e.g. /activities.xhtml?type=today). Each item of the list should have the link to somewhere, and this 'somewhere' should know the value of that URL parameter.

There is a controller to decide which list to show. This controller is stored in request scope [and I think it should be so]. As far as I understand there is no way to transmit url parameter through the link inside data-grid item while transfered data is stored in request scope. So I made special bean in session scope to store url parameter.

Unfortunately I could not make it works properly. The bean in session scope often stores old value of url-value instead of new one.

If you're lucky and my computer is up you can see it here

http://dsps.in:8080/richparams/activities.xhtml

Just navigate using menu. 'Type' parameter will not be always synchronised with the content of page.

My question is why does it work in such a weird way and how to make it works properly?

I attaches sources of sample project which does nothing but show this problem.

[bleathem]

You can use the <f:viewParam> introduced with JSF 2.0 to map request parameters to backing bean.

If you are stuck on JSF 1.x, have a look at prettyfaces (http://ocpsoft.com/prettyfaces/) to achieve the same effect.

Lastly, you can always lok at the facesContext.getExternalContext().getRequestParameterMap(), and parse the request parameters in your backing bean yourself.

[sukharevd]

I DO use JSF2 and f:viewParam descriptor.

It looks like they don't work in the way they should.

[iabughosh]

hi Sukharev,

I saw this code in your attachment :

<rich:panelMenuItem>

                                        <h:outputLink value="activities.xhtml?type=today">

                                                  <h:outputText value="Today Activities"></h:outputText>

                                        </h:outputLink>

                                        <f:param name="current" value="Today Activities" />

                              </rich:panelMenuItem>

try replacing it with this:

<rich:panelMenuItem>

<h:link outcome="activities.xhtml" includeViewParams="true" value="Today Activities">

   <f:param name="type" value="today" />

</h:link>

<f:param name="current" value="Today Activities" />

</rich:panelMenuItem>

regards.

[sukharevd]

Amazing!

But why is it so?

[iabughosh]

with JSF 2 , h:link is designed to submit GET requests and pass URL parameters using f:param or outcome="yourpage.xhtml?param=value", unlike the other commands which uses POST requests.

[sukharevd]

Cool! Thank you!