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Fixed #4018 -- Added code to allow callables as initial data in newforms. Thanks for the patch, David Danier.

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@5209 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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Russell Keith-Magee
2007-05-12 15:50:32 +00:00
parent 330cc98c73
commit 2345029d0d
3 changed files with 61 additions and 0 deletions
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58
tests/regressiontests/forms/tests.py
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@@ -2752,6 +2752,64 @@ then the latter will get precedence.
<li>Username: <input type="text" name="username" value="babik" maxlength="10" /></li>
<li>Password: <input type="password" name="password" /></li>
# Callable initial data ########################################################
The previous technique dealt with raw values as initial data, but it's also
possible to specify callable data.
>>> class UserRegistration(Form):
... username = CharField(max_length=10)
... password = CharField(widget=PasswordInput)
We need to define functions that get called later.
>>> def initial_django():
... return 'django'
>>> def initial_stephane():
... return 'stephane'
Here, we're not submitting any data, so the initial value will be displayed.
>>> p = UserRegistration(initial={'username': initial_django}, auto_id=False)
>>> print p.as_ul()
<li>Username: <input type="text" name="username" value="django" maxlength="10" /></li>
<li>Password: <input type="password" name="password" /></li>
The 'initial' parameter is meaningless if you pass data.
>>> p = UserRegistration({}, initial={'username': initial_django}, auto_id=False)
>>> print p.as_ul()
<li><ul class="errorlist"><li>This field is required.</li></ul>Username: <input type="text" name="username" maxlength="10" /></li>
<li><ul class="errorlist"><li>This field is required.</li></ul>Password: <input type="password" name="password" /></li>
>>> p = UserRegistration({'username': u''}, initial={'username': initial_django}, auto_id=False)
>>> print p.as_ul()
<li><ul class="errorlist"><li>This field is required.</li></ul>Username: <input type="text" name="username" maxlength="10" /></li>
<li><ul class="errorlist"><li>This field is required.</li></ul>Password: <input type="password" name="password" /></li>
>>> p = UserRegistration({'username': u'foo'}, initial={'username': initial_django}, auto_id=False)
>>> print p.as_ul()
<li>Username: <input type="text" name="username" value="foo" maxlength="10" /></li>
<li><ul class="errorlist"><li>This field is required.</li></ul>Password: <input type="password" name="password" /></li>
A callable 'initial' value is *not* used as a fallback if data is not provided.
In this example, we don't provide a value for 'username', and the form raises a
validation error rather than using the initial value for 'username'.
>>> p = UserRegistration({'password': 'secret'}, initial={'username': initial_django})
>>> p.errors
{'username': [u'This field is required.']}
>>> p.is_valid()
False
If a Form defines 'initial' *and* 'initial' is passed as a parameter to Form(),
then the latter will get precedence.
>>> class UserRegistration(Form):
... username = CharField(max_length=10, initial=initial_django)
... password = CharField(widget=PasswordInput)
>>> p = UserRegistration(auto_id=False)
>>> print p.as_ul()
<li>Username: <input type="text" name="username" value="django" maxlength="10" /></li>
<li>Password: <input type="password" name="password" /></li>
>>> p = UserRegistration(initial={'username': initial_stephane}, auto_id=False)
>>> print p.as_ul()
<li>Username: <input type="text" name="username" value="stephane" maxlength="10" /></li>
<li>Password: <input type="password" name="password" /></li>
# Help text ###################################################################
You can specify descriptive text for a field by using the 'help_text' argument