[mod_python] Blank form values are not showing up in my mod_pyton/mpservlets environments

Graham Dumpleton grahamd at dscpl.com.au
Sat Aug 27 02:26:28 EDT 2005

You are probably correct. If I change the "action" to point at my own  
form input testing page:


and don't change anything, I get back:
   Form Values

   Name Value
   address1 leave the above blank
   address2 leave all checkboxes blank

So yes, "products" doesn't display if there is nothing selected. This  
though appears to be
because the browser doesn't send it, not that mod_python ignores it.  
You can see this if
you use a GET request and set "action" to:


Note how "products" isn't even encoded into the URL.

Looks like your handler is going to have to explicitly handle that  
case. This would not
generally be a problem if using a scheme which mapped form arguments  
to actual
function arguments like in publisher or Vampire as you could specify  
a default value of
None for products and use that this pick up that it wasn't set at all.


On 27/08/2005, at 3:59 PM, Scott Chapman wrote:

> Graham,
> It appears that the keep_blank_values toggle does not turn on  
> checkbox inputs that are empty?  It  retains intput text but so far  
> not checkboxes. :(
> Can you run a quick test of this and tell me if I'm going insane or  
> not?
> Save this locally then load it in your browser and submit it just  
> like it is:
> <html><head></head><body>
> <form name="user_form" id="user_form" class="marginForm"  
> method="GET" action="http://www.mischko.com/test">
>   <fieldset>
>     <legend>User Information</legend>
>     <label id="l_job_title" for="job_title">Job Title</label>
>     <input id="job_title" name="job_title" size="30" type="text"  
> value=""/><br/>
>     <label class="required" id="l_address1" for="address1">Address</ 
> label>
>     <input id="address1" name="address1" size="30" type="text"  
> value="leave the above blank"/><br/>
>     <label id="l_address2" for="address2">&nbsp;</label>
>     <input id="address2" name="address2" size="30" type="text"  
> value="leave all checkboxes blank"/><br/>
>   </fieldset>
>   <fieldset class="radio">
>     <legend>Products Offered</legend>
>     <input id="products1" name="products" value="Seed"  
> type="checkbox"/>
>     <label id="l_products1" for="products1">Seed</label><br/>
>     <input id="products2" name="products" value="Seed Mixes"  
> type="checkbox"/>
>     <label id="l_products2" for="products2">Seed Mixes</label><br/>
>     <input id="products3" name="products" value="Certified Seed"  
> type="checkbox"/>
>     <label id="l_products3" for="products3">Certified Seed</ 
> label><br/>
>     <input id="products4" name="products" value="Plants"  
> type="checkbox"/>
>     <label id="l_products4" for="products4">Plants</label><br/>
>     <input id="products5" name="products" value="Equipment &amp;  
> Supplies" type="checkbox"/>
>     <label id="l_products5" for="products5">Equipment & Supplies</ 
> label><br/>
>   </fieldset>
>   <input id="submit_user_form" class="submit" value="Submit"  
> type="submit"/><br/>
> </form></body></html>
> You'll see that products does not show up in the GET URL or the  
> test page.
> Scott
> Graham Dumpleton wrote:
>> On 27/08/2005, at 1:19 PM, Scott Chapman wrote:
>>> Can anyone shed any light on why blank form elements are not  
>>> showing up in mod_python?
>> Would this help:
>>   form = util.FieldStorage(req,keep_blank_values=1)
>> See documentation:
>>    http://www.modpython.org/live/current/doc-html/pyapi-util- 
>> fstor.html
>> Graham

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