[Zope] Restatement of list problem

[Schmidt, Allen J.]

So then is there ANY way to definitively determine that something is a list
or not?

Have not tried but on first look it seems Dieter's solution would blow up if
not a list, correct?



-----Original Message-----
From: Jens Vagelpohl [mailto:jens@zope.com]
Sent: Friday, June 21, 2002 8:53 AM
To: Schmidt, Allen J.
Cc: 'zope@zope.org'
Subject: Re: [Zope] Restatement of list problem


string.find will blow up if this is really a list. if it is a string it 
will be OK. however, the dtmlin will blow up if you have a string. it will 
be fine if you have a list.

jens


On Friday, June 21, 2002, at 08:35 , Schmidt, Allen J. wrote:

> You are correct in how the hidden fields were set up.
> In your example, what if 'br' comes in as a single...not a list? Won't the
> dtml-in throw an error if it's not a list??
>
> My thought was to try this (semi-pseudo code):
>
> <if br>
>  <if string.find(br,'[')>  //then it's a list
>   <in br>
>     type=hidden name=sequence-item
>   </in>
>  <else> // not a list but a single
>     type=hidden name=br
>  </if>
> </if>
>
>
> Won't using the string.find expose the list so the dtml-in won't blow up?
>
>
> Thanks!!
>
> -Allen
>
>
> -----Original Message-----
> From: Dieter Maurer [mailto:dieter@handshake.de]
> Sent: Wednesday, June 19, 2002 1:49 PM
> To: Schmidt, Allen J.
> Cc: 'zope@zope.org'
> Subject: Re: [Zope] Restatement of list problem
>
>
> Schmidt, Allen J. writes:
>> Maybe I over-complicated my original request.
>>
>> I have a form field that is a list:
>> ['2 DR CONVERTIBLE','2 DR COUPE','2 DR HATCHBACK']
>>
>> The URL looks like this:
>> vehicleList?bt=2+DR+CONVERTIBLE&bt=2+DR+COUPE&bt=2+DR+HATCHBACK
>>
>> When I pick for years 2002 and 2001 for the above body types, the URL
>> changes a bit:
>>
>
vehicleList?yr%3Alist=2002&yr%3Alist=2001&bt%3Alist=%5B%272+DR+CONVERTIBLE%2
>> 7%2C+%272+DR+COUPE%27%2C+%272+DR+HATCHBACK%27%5D
> This looks as if you would have your list in a hidden variable
> of the form
>
>    <input name="bt:list" type="hidden" value="&dtml-bt;">
>
> When this arrives at the Zope server, you will get a list with
> one string that respresents the former list as a string.
>
> You need instead:
>
>    <dtml-in br>
>      <input name="bt:list" type="hidden" value="&dtml-sequence-item;">
>    </dtml-else>
>      <input name="bt:tokens" type="hidden" value="">
>    </dtml-in>
>
>    i.e. each list element must gets its one "input" control.
>
>
> Dieter
>
>
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