How to get parameters from the URL in JSF properly?

Question

I believe there are 2 ways to get the parameters from the URL in JSF.

One being in the bean:

Map<String, String> params =FacesContext.getCurrentInstance().
                   getExternalContext().getRequestParameterMap();
String parameterOne = params.get("parameterOne");

and the other one being in the facelets page

<f:metadata>
    <f:viewParam name="parameterOne" value="#{bean.parameterOne}"/>
</f:metadata>

Obviously the latter one will require a field in the class and getter / setter for it.

Besides that, what are the differences between these 2 different approaches? Which one should be preferred?

Pretty neat article on a disadvantage of `` http://jdevelopment.nl/stateless-stateful-jsf-view-parameters/ — Andy, Jul 27 '13 at 01:04
@Andy: which is solved by OmniFaces `` (from the very same author as the article you linked there). — BalusC, Jul 27 '13 at 03:20
@BalusC Yes, I actually found this in one of your [blog entries](http://balusc.blogspot.com/2012/03/stateless-view-parameter.html). I thought OP might like. Heck, I learned about this myself just a few hours ago. — Andy, Jul 27 '13 at 04:06
Set param in view associating with bean attribute, take a look http://stackoverflow.com/questions/13495797/how-to-get-request-parameters-from-view-scoped-jsf-bean — Diogo Alves, Jan 27 '15 at 14:51

score 54 · Accepted Answer · edited May 23 '17 at 12:34

54

I think this may help: Get Request and Session Parameters and Attributes from JSF pages

In fact, there should be a query:

<h:outputText value="#{param['id']}" />

edited May 23 '17 at 12:34

Community

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answered Jul 26 '13 at 20:30

Christian Kuetbach

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I think the question is "How do I get a URL-parameter in my View, without adding a method in the view?" – Christian Kuetbach Jul 27 '13 at 19:26
5

Additionally, you can use `` for a more friendly syntax. – Bruno Gasparotto Sep 01 '17 at 18:32

How to get parameters from the URL in JSF properly?

1 Answers1