On Thursday 29 December 2005 11:06, Andreas Idl wrote:
> Hi
>
> 1. session = use visit objects for session values.
> 2. parameters between to pages = you may call a setter of the destination
> page
>
> here an example of a directlink listener:
>
> Integer value= (Integer)cycle.getServiceParameters()[0];
> DestinationPage page = (DestinationPage)
> cycle.getPage("DestinationPage");
> page.setValue(value);
> cycle.activate(page);
>
> Andreas
That seems more complex than it need be. The examples below carries an
integer variable around between all the pages called function which is used
to determine a high level function I am performing
I do something like the following
In the template
<form jwcid="@Form" listener="listener:doUpdate" delegate="bean:delegate">
<span jwcid="@Hidden" value="ognl:function" />
...
</form
and in the java PageClass
@InjectPage("Select")
public abstract Select getSelectPage();
public abstract void setFunction(int function);
public abstract int getFunction();
public IPage doUpdate () {
Select select = getSelectPage();
select.setFunction(getFunction()); // Don't say done anything
return select;
}
This shows calling a new page called "Select" with the function that I am
carrying around in a hidden field in my form. (It was set in a similar way by
the previous caller to this page.)
This avoids the need to create a session for the user with the additional
overhead that it needs.
It is of course also possible to set a new parameter via DirectLink parameters
Here is a little snippet from a table (using contrib:table) where the
directlink has a parameter (an id) which gets passed to the listener and then
on to the called page
<td jwcid="[EMAIL PROTECTED]">
<a jwcid="[EMAIL PROTECTED]"
listener="listener:doEdit"
parameters="ognl:{function,components.table.tableRow.id}"
class="name"
><span jwcid="@Insert"
value="ognl:components.table.tableRow.surname"
>Chandler</span></a></td>
And from the page class
@InjectPage("Edit")
public abstract Edit getEditPage();
public Edit doEdit(int function, int id) {
Edit edit = getEditPage();
// ignore the function parameter - not using it in the html -
set directly
edit.setFunction(Function.EDIT);
edit.setPersonId(id);
return edit;
}
Again, avoiding setting up a session at this point.
Just a little point about ordering on the target page. The page attach
listener in the last example is fired at the point where I call
getEditPage(). I use the parameter id to read the database in the edit page.
I have to do that in the Page Validate Listener - since when the page attach
listener is called the value is not yet set.
--
Alan Chandler
http://www.chandlerfamily.org.uk
Open Source. It's the difference between trust and antitrust.
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
