2013/4/25 Tomas Schertel <tscher...@gmail.com>
>
>
> On Wednesday, 24 April 2013 19:58:42 UTC-3, Steven Brown wrote:
>>
>> I have a few questions, and I'm not even sure how to google for them. I
>> am writing a page with a form. The form consists of several identical
>> lines of fields, where the user can fill in as many or as few lines of
>> information as they want. So, each line is going to have a date field, a
>> dropdown indicating a selected option, and a text box for some notes. Now,
>> I'm sure I could implement this by building the python-side form array with
>> a loop, where every time through the loop adds another set of fields to the
>> list of fields. My question is, on the HTML side, how should I access them
>> to render them? My first instinct is to just use an eval statement;
>> something like
>>
>> $:for i in range(10):
>> eval('form.date' + i + '.render()')
>> eval('form.choice' + i + '.render()')
>> eval('form.notes' + i + '.render()')
>> print '<br/ >'
>>
>> But this seems inelegant, not least because everyone has always drilled into
>> me to never
>> use eval except in the most dire of circumstances. Is there a better way?
>> What would also be
>> good, is if there was some way I could define how to render a single line,
>> in another place,
>>
>> and then call that process inside the for loop above.
>>
>> Another thing I am trying to do in the cleanest, most efficient way possible
>> is change
>> what's in the dropdown, depending on what is selected in the date field (and
>> later another
>>
>> dropdown). I found this:
>> http://stackoverflow.com/**questions/8763564/how-do-i-**update-a-dropdown-menu-when-**another-dropdown-menu-option-**is-selected
>>
>> <http://stackoverflow.com/questions/8763564/how-do-i-update-a-dropdown-menu-when-another-dropdown-menu-option-is-selected>
>>
>> which suggests using jQuery, but I'm wondering first, if there is any way
>> strictly within web.py
>> to do it. Second, I am going to populate the dropdown from a database, and
>> the only way I can
>> figure of doing everything, I need to a database query for every set of
>> options. So, am I
>>
>> correct in that assumption, or is there is a way to minimize dB hits.
>>
>> Finally, is there a better place to get documentation for web.py? webpy.org
>> seems pretty sparse,
>>
>> not to mention poorly organized.
>>
>>
> To populate dropdown with database values, you can use a jquery plugin.
> Two examples:
> https://github.com/tuupola/jquery_chained
> http://github.e-sites.nl/populate/
>
>
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I think this can help you:
http://jolthgs.wordpress.com/2012/07/28/listas-desplegables-encadenadas-con-ajax-en-jquery/
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