On Sunday, 28 April 2013 11:21:55 UTC-3, Jorge Toro wrote:
> 2013/4/25 Tomas Schertel <tsch...@gmail.com <javascript:>>
>
>>
>>
>> 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/
>
>
Nice example Jorge.
I'll try this :)
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