diff -r b97d08ebac0e -r 56e1c1721299 app/soc/views/helper/forms.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/soc/views/helper/forms.py	Fri Oct 03 23:59:49 2008 +0000
@@ -0,0 +1,172 @@
+#!/usr/bin/python2.5
+#
+# Copyright 2008 the Melange authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Helpers used to display various views that are forms.
+"""
+
+__authors__ = [
+  '"Chen Lunpeng" <forever.clp@gmail.com>',
+  '"Todd Larsen" <tlarsen@google.com>',
+  ]
+
+
+from google.appengine.ext.db import djangoforms
+
+from django import newforms as forms
+from django.utils import safestring
+
+
+class DbModelForm(djangoforms.ModelForm):
+  """Subclass of Django ModelForm that fixes some label and help_text issues.
+
+  The default behavior of ModelForm is to use the verbose_name in all
+  lowercase, capitalizing only the first character, as the displayed field
+  label.  This class uses verbose_name unaltered as the visible field label
+  instead.
+
+  The Property classes used by the App Engine Datastore do not have a
+  help_text parameter to their constructor.  In a Model class, a help_text
+  attribute *can* be added to the property after it is created, but the
+  help text will not be automatically passed along to the Django ModelForm.
+  This class detects the presence of a help_text attribute and adds it to
+  the corresponding form field object.
+
+  ugettext_lazy() proxies used for internationalization in the Model will
+  still work correctly with this new behavior, as long as the original
+  strings are used as the translation keys.
+  """
+
+  def __init__(self, *args, **kwargs):
+    """Fixes label and help_text issues after parent initialization.
+
+    Args:
+      *args, **kwargs:  passed through to parent __init__() constructor
+    """
+    super(DbModelForm, self).__init__(*args, **kwargs)
+
+    for field_name in self.fields.iterkeys():
+      # Since fields can be added only to the ModelForm subclass, check to
+      # see if the Model has a corresponding field first.
+      if hasattr(self.Meta.model, field_name):
+        model_prop = getattr(self.Meta.model, field_name)
+
+        # Check if the Model property defined verbose_name, and copy that
+        # verbatim to the corresponding field label.
+        if hasattr(model_prop, 'verbose_name'):
+          self.fields[field_name].label = model_prop.verbose_name
+
+        # Check if the Model property added help_text, and copy that verbatim
+        # to the corresponding field help_text.
+        if hasattr(model_prop, 'help_text'):
+          self.fields[field_name].help_text = model_prop.help_text
+
+
+class SelectQueryArgForm(forms.Form):
+  """URL query argument change control implemented as a Django form.
+  """
+
+  ONCHANGE_JAVASCRIPT_FMT = '''
+<script type="text/javascript"> 
+  function changeArg_%(arg_name)s(item) 
+  {
+    var idx=item.selectedIndex;
+    item.selected=true;
+    var value=item.value 
+    var url = location.href 
+    var reg = /%(arg_name)s=\d+/ 
+    url = url.replace(reg, "%(arg_name)s="+value) 
+    if(url.match(reg))
+      document.location.href = url 
+   else
+      document.location.href = "%(page_path)s?%(arg_name)s="+value; 
+  }
+</script>
+'''
+
+  def __init__(self, page_path, arg_name, choices, field_name,
+               *form_args, **form_kwargs):
+    """
+    Args:
+      page_path: (usually request.path)
+      arg_name: the URL query parameter that determines which choice is
+        selected in the selection control
+      choices: list (or tuple) of value/label string two-tuples, for example:
+        (('10', '10 items per page'), ('25', '25 items per page'))
+      field_name: name of the selection field in the form
+      *form_args: positional arguments passed on to the Form base
+        class __init__()
+      *form_kwargs: keyword arguments passed on to the Form base
+        class __init__()
+    """
+    super(SelectQueryArgForm, self).__init__(*form_args, **form_kwargs)
+    
+    self._script = safestring.mark_safe(self.ONCHANGE_JAVASCRIPT_FMT % {
+        'arg_name': arg_name, 'page_path': page_path,})
+ 
+    onchange_js_call = 'changeArg_%s(this)' % arg_name
+    
+    self.fields[field_name] = forms.ChoiceField(
+        label='', choices=choices,
+        widget=forms.widgets.Select(attrs={'onchange': onchange_js_call}))
+      
+  def as_table(self):
+    """Returns form rendered as HTML <tr> rows -- with no <table></table>.
+    
+    Prepends <script> section with onchange function included.
+    """
+    return self._script + super(SelectQueryArgForm, self).as_table()
+
+  def as_ul(self):
+    """Returns form rendered as HTML <li> list items -- with no <ul></ul>.
+    
+    Prepends <script> section with onchange function included.
+    """
+    return self._script + super(SelectQueryArgForm, self).as_ul()
+
+  def as_p(self):
+    """Returns form rendered as HTML <p> paragraphs.
+    
+    Prepends <script> section with onchange function included.
+    """
+    return self._script + super(SelectQueryArgForm, self).as_p()
+
+
+DEF_SELECT_QUERY_ARG_FIELD_NAME_FMT = 'select_query_arg_%(arg_name)s'
+
+def makeSelectQueryArgForm(
+    request, arg_name, initial_value, choices,
+    field_name_fmt=DEF_SELECT_QUERY_ARG_FIELD_NAME_FMT):
+  """Wrapper that creates a customized SelectQueryArgForm.
+
+  Args:
+    request: the standard Django HTTP request object
+    arg_name: the URL query parameter that determines which choice is
+      selected in the selection control
+    initial_value: the initial value of the selection control
+    choices: list (or tuple) of value/label string two-tuples, for example:
+      (('10', '10 items per page'), ('25', '25 items per page'))
+    field_name_fmt: optional form field name format string; default is
+      DEF_SELECT_QUERY_ARG_FIELD_NAME_FMT; contains these named format
+      specifiers:
+        arg_name: replaced with the arg_name argument
+
+  Returns:
+    a Django form implementing a query argument selection control, for
+    insertion into a template
+  """
+  field_name = field_name_fmt % {'arg_name': arg_name}
+  return SelectQueryArgForm(request.path, arg_name, choices, field_name,
+                            initial={field_name: initial_value})