1. Is the filter always the token between the "?" and the first "@" in a url?

2. If a url has no filter, the previous filter is always presumed?

No, not necessarily.


No, without a filter you get an error.

Ok, how do you determine what the filter is, then?

As for #2, your answer doesn't make sense. Valid URL's in the XSL files don't always have filters in them. Some are simply the name of the template. For example, the stock track.xsl template includes the link: "Track_Credits.xsl". There's no filter specified there.

- Jeff

Please look at the code I sent you (explorer.pas).
Look for the handling of SaveTemplate and SaveFilter.

Ok, how do you handle the situation I posted above for the link to "Track_Credits.xsl" in "Track.xsl"?

I have my code working for some time now, I'm just not sure I'm doing things the most efficient way.

- Jeff

In function TFrmExplorer.GetCATraxxData the Filter is saved to SaveFilter (conditional).

if not NoSave then
begin
SaveTemplate:=Template;
SaveFilter:=Filter;
end;

In procedure TFrmExplorer.ViewerHotSpotClick the various possibilities is checked.
In this case (Track_Credits.xsl) it will be trapped here:

if ContainsStr(URL, '.xsl') then
begin
Template:=HAPgetToken(URL,'?',1);
Filter:=Copy(URL,Length(Template) + 2,
Length(URL) - Length(Template) - 1);
if Filter = '' then Filter:=SaveFilter;
end

Since there is no filter, SaveFilter is used.
SaveFilter will contain "ID=1"

Hope that helps.

Why would ID=1? What if that's not the id of the track being displayed in the track.xsl template?

Do this. Bring up track.xsl?id=2. Now click on the link linking to Track_Credits.xsl. The link is:
That's valid in the Catraxx explorer (it's even from a default template). How does your code handle that?

- Jeff

Oh, I see. You're using "ID=1" as an example. You save the last filter, and if there's no new filter, you use the last filter. That's what I'm doing, although it gets tough if you're tracking multiple connections (each with its own filter).

That is not difficult. Is something not working correctly?


Not? Trying to generate either a record or list page without a filter will result in an error ("invalid record id" or "no filter criteria").


That is because the explorer module keeps track of the record id of the "active" record, and automatically uses this id as the filter when linking to a record page if a filter is not specificed. If you want to use the standard templates, you have to do this yourself.

Exactly. If the URL has not filter specified, the explorer module uses the last good filter. The URL has no filter, though, and no error is specified. That was my question.

- Jeff

Only for record pages, though.


I thought you were talking about the data server, not the explorer module...