invoke a action method everytime a page is accessed FROM ano

[antispart]

I have a SFSB in conversation scope. But I want to have the option of passing it request parameters.

So, for example:

<s:link value="Search" action="search">
<f:param name="searchPattern" value="#{oldbean.searchPattern}"/>
</s:link>

Now, I need some way of telling the searchActionBean to use the RequestParameter searchPattern instead of another one living in conversation scope (they cant be the same property b/c of some other complication).

Now, if i put an action=... in pages.xml this will get called everytime the page/view is accessed. Instead I only want this action method to be invoked when the request parameter comes in. I thought I could stick a call to this method in the setter but the setter seems to be called regardless of whether the RequestParameter is specified.

Anyone have any ideas what i can do?

[pmuir]

I think that the @RequestParameter will only be not-null when you have an f:param specified. So use an action method run through pages.xml, check for not-null, and act accordingly.

[antispart]

Thanks petemuir.

I have the following code:

actionBean

 @Begin(join=true)
 public void foo() {
 if(player!=null)
 log.debug("set");
 }
 public void setBar(String bar) {
 this.bar= bar;
 }
 public String getBar) {
 return bar;
 }

pages.xml

<page view-id="/players/plays.xhtml" action="#{playerPlayAction.foo}"/>

xhtml

<s:link ... >
 <f:param name="bar" value="test"/>
</s:link>

While foo() gets called every time the page is accessed. the setBar() method is never called.

If I add:

<param name="bar" value="#{actionBean.bar}"/>

to the pages.xml then the setBar() is called, BUT.

Once i've navigated to the page 1 time from the s:link now the bar property is always not-null (note that this is a conversation scoped bean).

Is there any solution to this?

[norman.richards]

If you need a very peculiar strategy, why not just look up the value as a request attribute directly?

[pmuir]

1) If you put a

<param name="bar" value="#{actionBean.bar}"/>

into pages.xml it causes the param to be propagated.

2) Try this in the action bean (without param in pages.xml)

@RequestParameter
private String bar;

@Begin(join=true)
public void foo() {
 if(player!=null)
 log.debug("set");
}

[antispart]

petemuir,

I tried:

action bean:

 @RequestParameter
 private String bar;

 @Begin(join=true)
 public void foo() {
 if(bar!=null)
 log.debug("set");
 }

xhtml:

<s:link ...>
 <f:param name="bar" value="testtest"/>
</s:link>

pages.xml:

<page view-id="/players/plays.xhtml" action="#{playerPlayAction.foo}"/>

Now, when foo() gets called with the s:link the @RequestParameter bar is never set. But if i use an h:outputLink or just type the url string myself then the @RequestParameter does get set. Is this expected behavior?

The advantage of s:link is that I could continue a conversation (add "join=true" to the foo() method) AND pass in params via a @RequestParam.

Is this not meant to work with s:link or am I do something wrong?

[pmuir]

Now, when foo() gets called with the s:link the @RequestParameter bar is never set. But if i use an h:outputLink or just type the url string myself then the @RequestParameter does get set. Is this expected behavior?

Not sure, sorry. You could just use a commandLink with s:conversationPropagation I think.

[antispart]

Thanks. Your help is always appreciated.