Thanks Rick I really appreciate the answer. This is the conclusion I
was coming to, too.
That JSP sounds like it could be useful to keep lying about seeing as
I'm fairly new to EL too.
Tbh (as u concur) I think this would be a fairly decent feature
request to ask for, seeing as the key is pretty important when dealing
with map-based objects.
Dean.
On 15/03/06, Rick Herrick <[EMAIL PROTECTED]> wrote:
> Dean Pullen wrote:
> > Seeing the replies that have been posted in the last few days, I'm
> surprised noone is able to help with this? :(
> >
> > On 13/03/06, Dean Pullen <[EMAIL PROTECTED]> wrote:
> >> Still not made any progress with this, and having looked through the
> achieves a few times I still haven't made any head way :-/
> >> I need to get hold of the current row object's key, but only the
> current row/bean's properties are accessbile. Surely there must be away
> using the EL to get the key?
>
> Dean:
>
> I think the sad reason for that is that there is no direct easy way to get
> the key that you want. For a nice graphic illustration, I've attached a
> hideous JSP file that I cooked up to show the various attributes available
> in all scopes.
>
> Note that the technique I use in here, of enumerating all of the
> attributes from every scope available, is actually useful in more than
> just this situation. It can be really helpful to figure out why you are
> or are not seeing particular results from EL. I use it an awful lot.
>
> Anyways, there's a Map containing Acegi User objects (this just happened
> to be a POJO I had available on the classpath, you can substitute whatever
> you want for illustration). These are stored in the map by a key
> unrelated to the bean names or propety values or anything. If you look at
> the huge Objects column, you'll see that the only place that those names
> (object1, object2, etc.) show up is in the map itself.
>
> But this also contains a work around that you can use to get the key for
> the current row. There are a number of caveats:
>
> * You have to do some pre-processing. This is where I grab the map keys
> and convert them into a list, then set that as a request attribute:
>
> List<String> keys = new ArrayList<String>(map.keySet());
> request.setAttribute("keys", keys);
>
> * You can then reference the list with an EL expression using the
> item_rowNum attribute. You have to subtract one, since the list is
> 0-based and the iteration counter is 1-based:
>
> ${keys[item_rowNum - 1]}
>
> So there is no implicit object generated for the Map key. You just have
> to jump through some hoops to get it yourself.
>
> This would actually be a nice thing to have, so that if the named object
> is a Map, create an extra implicit object called name_key, just like
> name_rowNum. This would be cool for IDs, anchors, other things like
> that...
>
> --
> Rick Herrick
> [EMAIL PROTECTED]
>
> I haven't got time for inner peace.
>
> "No reasonable definition of reality could be expected to permit
> this."--Albert Einstein, Boris Podolsky and Nathan Rosen in 1935
>
>
>
>
>
>
>
>
>
>
>
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