JSF - Change the action for a h:commandButton (2.0)

https://stackoverflow.com/questions/3807746

jsf
jsf-2

25-09-2019
|

문제

Im new into JSF 2.0. On the last version i understand that if i want change rules about "what send to the client" i just need to configure the faces-config.xml.

Now, on version 2.0, how can manage the Action? For example, if i have this on a index.xhtml

<h:commandButton id="submit" value="submit" action="response" />

and i need to call a page called response.html (not xhtml) or that page placed into /folder/response.html, or somethings else? How can do it? I know JSF 2.0 is very flexible about these things (the concept of href links is beaten). So i think i can manage this with other methodologies, right?

해결책

The action can point two things:

A method expression action="#{bean.methodname}" where the method look like this:
```
@ManagedBean
@RequestScoped
public class Bean {
    public String methodname() {
        // Do some business task here.
        return "response";
    }
}
```
After executing the method the action will effectively end up containing the return value of the method, like so: action="response".

You can also control the outcome "dynamically" the usual Java way:
```
public String methodname() {
    if (someCondition) {
        return "somepage";
    } else {
        return "anotherpage";
    }
}
```
Depending on the condition outcome, the action will end up like action="somepage" or action="anotherpage"
Another XHTML page in the same folder as the current XHTML page. You just have to specify the filename: action="response".

Either way, it will go to the XHTML page which is composed by outcome + ".xhtml" where outcome is the action value (e.g. response.xhtml, somepage.xhtml or anotherpage.xhtml) which is supposed to be in the same folder as the XHTML file containing the h:commandButton.

You don't need to configure anything in faces-config.xml for this. Previously, during JSF 1.x ages you would need to define <navigation-case> for this.

JSF - Change the action for a h:commandButton (2.0)

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