title: django dropdownlist onchange submission
body: <p>I am showing to the user a dropdown list from this form:</p>
  
  <pre><code>class CronForm(forms.Form):
      days = forms.ModelChoiceField(queryset=Day.objects.all().order_by('day'))
  
  class Day(models.Model):
      day = models.CharField(max_length=200, default='')
      month = models.CharField(max_length=200, default='')
      def __unicode__(self):
          return self.day
  </code></pre>
  
  <p>And It is shown at the template this way: </p>
  
  <pre><code>&lt;form method="post" onchange=change()&gt;
      {{ days }}
  &lt;/form&gt;
  </code></pre>
  
  <p>What I want is to submit this form when the user selects an option from the dropdown list. For example, the user could be redirected to a new url, and internally the program would capture the POST data. But everything I find is related to the <code>&lt;select&gt;</code> tag, like calling a javascript function onchange of the select element. But as the select element is IN the ModelChoiceField form, I don't know how to do it.
  Any help would be very appreciated! </p>