[Zope] trees

[Michel Pelletier]

> -----Original Message-----
> From: Oleg Machulski [mailto:oleg_machulski@geocities.com]
> Sent: Monday, May 24, 1999 4:18 AM
> To: Dmitry B. Khlonin; zope@zope.org
> Subject: Re: [Zope] trees
> 
> 
> I tried the following DTML code:
> 
> <!--#call "REQUEST.set('ttt', {'a1': {'b': 'bbb1', 'c': 'ccc1', 'a':
> 'aaa1'}, 'b': 'bbb', 'c': 'ccc', 'a2': {'b': 'bbb2', 'c': 'ccc2', 'a':
> 'aaa2'}, 'a': 'aaa'} )"-->
> 
> <!--#tree name="ttt" branches="keys" leaves="keys"-->
>   <!--#var id-->, '<!--#var expr="_"-->'
> <!--#/tree-->
> 

The objects that your tree tag iterates over must have an 'id' attribute
if you want to say <!--#var id-->  Otherwise the DocumentTemplate will
look 'up' in the namespace and find the folders 'id', like it does.

Unlike, 'in' where there is a 'sequence-item' variable, the 'tree' tag
has no coresponding 'tree-item' variable.  It is just assumed you are
iterating over objects with attributes that you are looking for.

Adding a 'tree-item' looks like a good idea, then you could say <!--#var
"tree-item[0]"--> to get what looks like your looking for.  Patches, as
allways, are welcome, otherwise this will go on the back burner.

-Michel

PS: Oleg, can you not send HTML formated mail to the list?  It makes it
a bit difficute to answer your mail from mailers that don't support
HTML.

> 
> and it generates the tree with 5 branches (accoarding to 5 
> keys in array
> 'ttt'), 
> but <!--#var id--> is substituted as id of folder, containing 
> this dtml
> method. 
> I just do not know why this construction works :-), but seems, we have
> to guess 
> 2 things: 
>   1) how to retrieve leaves for each branch 
>   2) which symbol to use in the body of the #tree tag to display
> contents.
> 
> after we guess guess it, it is possible to write 2 external python
> methods, 
> which will retrieve corresponding sets from the database. 
> 
> btw, I tried to find an example of such a custom tree in the Zope
> examples, 
> or elsewhere in the internet, but search failed :-(
> 
> -- 
> Best regards
> 
>         Oleg Machulski
> ----------------------------------------------------
> http://www.geocities.com/SiliconValley/Network/7671/
> mailto:oleg_machulski@geocities.com
> 
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