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Posted to users@tapestry.apache.org by Petri Wessman <or...@iki.fi> on 2008/03/18 14:45:29 UTC
[t4] rendering DirectLink from Java code (renderer)
Hello all, I have a new question. I'd need to generate a
DirectLink-style link from inside Java code (render method); in other
words, generate HTML that would duplicate the effect of this:
<a jwcid="@DirectLink" listener="listener:someAction"
parameters="ognl:someId">link text</a>
from a Java code method which has access to a IMarkupWriter object (and
the IPage, if needed).
Any tips on how to do this? I tried browsing the DirectLink.java source,
but the N levels of abstraction there mostly just gave me a headache :}.
The reason I need to do this is: I need to generate a listing of
"events" for a system. Some of those events will contain various system
object IDs, and I need to make those IDs into links that will point to
detail on the specific ID. There may be more than one link per line, or
none.
So I'd have stuff like:
* something happened
* something else happened to item XXX
* used requested item XXX to me merged with other type of item YYY
and I'd like to make those XXX and YYY parts into links that would lead
to a detail page on the given system object. The actual text is
localized (comes from page.getMessages()).
The only way I've figured to do this is to use a @Delegator object and
roll up my own renderer for the item line HTML.. but now I'm stumped at
the "how do I generate a Tapestry link from within code" step.
All help and pointers much appreciated :}
//Petri
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Re: [t4] rendering DirectLink from Java code (renderer)
Posted by Ben Dotte <be...@gmail.com>.
You're right about the number of methods in IDirect, sorry I forgot to
clarify that. I guess all of the places I am doing this, the class
implementing IDirect is an abstract Tapestry page or component. This
way Tapestry fills in all the details on those other methods and all I
need to implement is trigger().
I'm not sure how else to do it, unfortunately. If you're generating
the link in a page or component it's not too difficult, and I suppose
even if you aren't, you can always retrieve a page/component that
implements IDirect from the request cycle for that first parameter.
On Tue, Mar 18, 2008 at 11:16 AM, Petri Wessman <or...@iki.fi> wrote:
> Ben Dotte wrote:
> > Hi Petri,
> >
> > To generate a DirectLink href programmatically, you'll need a class
> > that implements IDirect. In the trigger() method on that, you can call
> > the intended listener. Refer to an instance of the class implementing
> > IDirect for the first parameter of DirectServiceParameter, set the
> > Direct engine service on it (@InjectObject("engine-service:direct") or
> > with a setter for a regular service), and create the href portion like
> > this:
> >
> > public String getDirectHref()
> > {
> > Object[] params = new Object[] { param1, param2, etc };
> > DirectServiceParameter dsParam = new DirectServiceParameter(this, params);
> > ILink link = directService.getLink(false, dsParam);
> > return link.getURL();
> > }
> >
> > HTH
> > Ben
>
> Thanks, that looks exactly what I'm looking for! I noticed DirectService
> in the API docs, but could not figure out quite how it should be used.
>
> One additional question, though: what's the smartest way to get a class
> that implements IDirect? That interface by itself requires that you
> implement a metric ton of methods, so I'm thinking there must be a
> smarter way.
>
> I tried
>
> public class TestDirectLink extends AbstractComponent implements IDirect
>
> and them implemented the few methods required by AbstractComponent and
> the IDynamicInvoker & IDirect interfaces, but I'm unsure of how to
> instantiate the class that so it can be used for creating the link.
>
> If I just create it as a POJO, I get a Tapestry exception when I try to
> use it:
>
> Exception: ....TestDirectLink@3c1[null] container is null.
>
> So I probably need to attach it to the current page (or something)? Or
> is AbstractComponent the wrong way to proceed, here?
>
> //Petri
>
>
>
>
> > On Tue, Mar 18, 2008 at 8:45 AM, Petri Wessman <or...@iki.fi> wrote:
> >> Hello all, I have a new question. I'd need to generate a
> >> DirectLink-style link from inside Java code (render method); in other
> >> words, generate HTML that would duplicate the effect of this:
> >>
> >> <a jwcid="@DirectLink" listener="listener:someAction"
> >> parameters="ognl:someId">link text</a>
> >>
> >> from a Java code method which has access to a IMarkupWriter object (and
> >> the IPage, if needed).
> >>
> >> Any tips on how to do this? I tried browsing the DirectLink.java source,
> >> but the N levels of abstraction there mostly just gave me a headache :}.
> >>
> >> The reason I need to do this is: I need to generate a listing of
> >> "events" for a system. Some of those events will contain various system
> >> object IDs, and I need to make those IDs into links that will point to
> >> detail on the specific ID. There may be more than one link per line, or
> >> none.
> >>
> >> So I'd have stuff like:
> >>
> >> * something happened
> >> * something else happened to item XXX
> >> * used requested item XXX to me merged with other type of item YYY
> >>
> >> and I'd like to make those XXX and YYY parts into links that would lead
> >> to a detail page on the given system object. The actual text is
> >> localized (comes from page.getMessages()).
> >>
> >> The only way I've figured to do this is to use a @Delegator object and
> >> roll up my own renderer for the item line HTML.. but now I'm stumped at
> >> the "how do I generate a Tapestry link from within code" step.
> >>
> >> All help and pointers much appreciated :}
> >>
> >> //Petri
> >>
> >> ---------------------------------------------------------------------
> >> To unsubscribe, e-mail: users-unsubscribe@tapestry.apache.org
> >> For additional commands, e-mail: users-help@tapestry.apache.org
> >>
> >>
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@tapestry.apache.org
> > For additional commands, e-mail: users-help@tapestry.apache.org
> >
>
>
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> For additional commands, e-mail: users-help@tapestry.apache.org
>
>
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Re: [t4] rendering DirectLink from Java code (renderer)
Posted by Petri Wessman <or...@iki.fi>.
Ben Dotte wrote:
> Hi Petri,
>
> To generate a DirectLink href programmatically, you'll need a class
> that implements IDirect. In the trigger() method on that, you can call
> the intended listener. Refer to an instance of the class implementing
> IDirect for the first parameter of DirectServiceParameter, set the
> Direct engine service on it (@InjectObject("engine-service:direct") or
> with a setter for a regular service), and create the href portion like
> this:
>
> public String getDirectHref()
> {
> Object[] params = new Object[] { param1, param2, etc };
> DirectServiceParameter dsParam = new DirectServiceParameter(this, params);
> ILink link = directService.getLink(false, dsParam);
> return link.getURL();
> }
>
> HTH
> Ben
Thanks, that looks exactly what I'm looking for! I noticed DirectService
in the API docs, but could not figure out quite how it should be used.
One additional question, though: what's the smartest way to get a class
that implements IDirect? That interface by itself requires that you
implement a metric ton of methods, so I'm thinking there must be a
smarter way.
I tried
public class TestDirectLink extends AbstractComponent implements IDirect
and them implemented the few methods required by AbstractComponent and
the IDynamicInvoker & IDirect interfaces, but I'm unsure of how to
instantiate the class that so it can be used for creating the link.
If I just create it as a POJO, I get a Tapestry exception when I try to
use it:
Exception: ....TestDirectLink@3c1[null] container is null.
So I probably need to attach it to the current page (or something)? Or
is AbstractComponent the wrong way to proceed, here?
//Petri
> On Tue, Mar 18, 2008 at 8:45 AM, Petri Wessman <or...@iki.fi> wrote:
>> Hello all, I have a new question. I'd need to generate a
>> DirectLink-style link from inside Java code (render method); in other
>> words, generate HTML that would duplicate the effect of this:
>>
>> <a jwcid="@DirectLink" listener="listener:someAction"
>> parameters="ognl:someId">link text</a>
>>
>> from a Java code method which has access to a IMarkupWriter object (and
>> the IPage, if needed).
>>
>> Any tips on how to do this? I tried browsing the DirectLink.java source,
>> but the N levels of abstraction there mostly just gave me a headache :}.
>>
>> The reason I need to do this is: I need to generate a listing of
>> "events" for a system. Some of those events will contain various system
>> object IDs, and I need to make those IDs into links that will point to
>> detail on the specific ID. There may be more than one link per line, or
>> none.
>>
>> So I'd have stuff like:
>>
>> * something happened
>> * something else happened to item XXX
>> * used requested item XXX to me merged with other type of item YYY
>>
>> and I'd like to make those XXX and YYY parts into links that would lead
>> to a detail page on the given system object. The actual text is
>> localized (comes from page.getMessages()).
>>
>> The only way I've figured to do this is to use a @Delegator object and
>> roll up my own renderer for the item line HTML.. but now I'm stumped at
>> the "how do I generate a Tapestry link from within code" step.
>>
>> All help and pointers much appreciated :}
>>
>> //Petri
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tapestry.apache.org
>> For additional commands, e-mail: users-help@tapestry.apache.org
>>
>>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tapestry.apache.org
> For additional commands, e-mail: users-help@tapestry.apache.org
>
---------------------------------------------------------------------
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Re: [t4] rendering DirectLink from Java code (renderer)
Posted by Ben Dotte <be...@gmail.com>.
Hi Petri,
To generate a DirectLink href programmatically, you'll need a class
that implements IDirect. In the trigger() method on that, you can call
the intended listener. Refer to an instance of the class implementing
IDirect for the first parameter of DirectServiceParameter, set the
Direct engine service on it (@InjectObject("engine-service:direct") or
with a setter for a regular service), and create the href portion like
this:
public String getDirectHref()
{
Object[] params = new Object[] { param1, param2, etc };
DirectServiceParameter dsParam = new DirectServiceParameter(this, params);
ILink link = directService.getLink(false, dsParam);
return link.getURL();
}
HTH
Ben
On Tue, Mar 18, 2008 at 8:45 AM, Petri Wessman <or...@iki.fi> wrote:
> Hello all, I have a new question. I'd need to generate a
> DirectLink-style link from inside Java code (render method); in other
> words, generate HTML that would duplicate the effect of this:
>
> <a jwcid="@DirectLink" listener="listener:someAction"
> parameters="ognl:someId">link text</a>
>
> from a Java code method which has access to a IMarkupWriter object (and
> the IPage, if needed).
>
> Any tips on how to do this? I tried browsing the DirectLink.java source,
> but the N levels of abstraction there mostly just gave me a headache :}.
>
> The reason I need to do this is: I need to generate a listing of
> "events" for a system. Some of those events will contain various system
> object IDs, and I need to make those IDs into links that will point to
> detail on the specific ID. There may be more than one link per line, or
> none.
>
> So I'd have stuff like:
>
> * something happened
> * something else happened to item XXX
> * used requested item XXX to me merged with other type of item YYY
>
> and I'd like to make those XXX and YYY parts into links that would lead
> to a detail page on the given system object. The actual text is
> localized (comes from page.getMessages()).
>
> The only way I've figured to do this is to use a @Delegator object and
> roll up my own renderer for the item line HTML.. but now I'm stumped at
> the "how do I generate a Tapestry link from within code" step.
>
> All help and pointers much appreciated :}
>
> //Petri
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tapestry.apache.org
> For additional commands, e-mail: users-help@tapestry.apache.org
>
>
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