Rails - May 2008 - Struggling with Date fields - select_month and select_year

Hi,

I collect month and year from user for a particular field called start
date.
Year is mandatory where as month is optional.

Initially i used date_select for the field, but moved away when i learnt
that in date_select if user doesnt choose the month, month is set to Jan
by default.

So i thought of using, separate fields for month and year of type
integer. Tried using select_date and select_year, but could not set
default to blank in those methods.

So moved to plain html listing for select: Shown for date below

select id="magazine_start_date_month"
name="magazine[start_date_month]">
<option value=""></option>
<option value="1">January</option>
<option value="2">February</option>
<option value="3">March</option>
<option value="4">April</option>
<option value="5">May</option>
<option value="6">June</option>
<option value="7">July</option>
<option value="8">August</option>
<option value="9">September</option>
<option value="10">October</option>
<option value="11">November</option>
<option value="12">December</option>
</select>
 and similarly for year too.

But when i tied to edit this, the fields are not getting populated but
value is stored correctly in db.

Any suggestions?
I knw i have done many foolish/naive things to get here, but i have
found no other way.

Regards,
Sandeep G
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On May 20, 2008, at 1:42 AM, Sandeep Gudibanda wrote:
> So moved to plain html listing for select: Shown for date below
>
> select id="magazine_start_date_month" name="magazine 
> [start_date_month]">
> <option value=""></option>
> <option value="1">January</option>
> <option value="2">February</option>
> <option value="3">March</option>
> <option value="4">April</option>
> <option value="5">May</option>
> <option value="6">June</option>
> <option value="7">July</option>
> <option value="8">August</option>
> <option value="9">September</option>
> <option value="10">October</option>
> <option value="11">November</option>
> <option value="12">December</option>
> </select>
>  and similarly for year too.
>
> But when i tied to edit this, the fields are not getting populated but
> value is stored correctly in db.
If that''s your exact code, then you haven''t provided for any
way to
mark which item has been selected.

Just like you have to populate the value="" attribute in <input>
tags, you have to populate the selected="selected" attribute of the  
<select> tag.

Here''s the tedous way to do that, which whos you the prinicple. It  
assumes your form data is in

<select id="magazine_start_date_month" name="magazine 
[start_date_month]">

<option value=""></option>

<option value="1"<%= if magazine.start_date_month ==
''1''; ''
selected="selected"''; end %>>January</option>

<option value="2"<%= if magazine.start_date_month ==
''2''; ''
selected="selected"''; end %>>February</option>

<option value="3"<%= if magazine.start_date_month ==
''3''; ''
selected="selected"''; end %>>March</option>
...
</select>


Of course doing that manually for all select tags in your app can be  
tedious and prone to errors, so writing a generic routine to draw  
these things is usually a good idea. I have a general purpose library  
for defining, caching, and drawing value lists like this.

-- greg willits



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hmmm. pretty tedious.

Why doesn''t select_month and select_year doesn''t provide
options to
choose default and also suport for form variables, just the way 
date_select is done.
Or do they provide and I am just blind to it?

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Thanks Greg. I managed to write a helper function to return the option 
tag with selected = "selected" set.

Helper Function:
def build_selected_option_for_months(value)
    months = Date::MONTHNAMES
    return ''<option value="'' + value.to_s +
''"selected="selected">'' +
months[value] + ''</option>''
end
In the view:

option value=""></option>
<option value="1">January</option>
<option value="2">February</option>
<option value="3">March</option>
<option value="4">April</option>
<option value="5">May</option>
<option value="6">June</option>
<option value="7">July</option>
<option value="8">August</option>
<option value="9">September</option>
<option value="10">October</option>
<option value="11">November</option>
<option value="12">December</option>
<%= build_selected_option_for_months(@user_company.start_date_month) %>
</select>
Thanks a lot again.

Regards,
Sandeep G

Sandeep Gudibanda wrote:
> 
> hmmm. pretty tedious.
> 
> Why doesn''t select_month and select_year doesn''t provide
options to
> choose default and also suport for form variables, just the way 
> date_select is done.
> Or do they provide and I am just blind to it?
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