Examples

We start with a simple credential validation example. Before we proceed let setup virtualenv environment:

$ virtualenv env
$ env/bin/easy_install wheezy.html

Signin Widget

Suppose we need add user credential input to HTML form. In case of error would be good display it next to each input. Domain model looks like this:

class Credential(object):

    def __init__(self):
        self.username = ''
        self.password = ''

Here is what we can get in html template:

>>> from wheezy.html import widget
>>> credential = Credential()
>>> errors = {}
>>> credential = widget(credential, errors)
>>> credential.username.label('Username:')
<label for="username">Username:</label>
>>> credential.username.textbox(autocomplete='off')
<input autocomplete="off" type="text" id="username"
  value="" name="username" />
>>> credential.username.error()

Look how this changes in case of errors:

>>> errors = {'username': ['Required field cannot be left blank.']}
>>> credential = widget(credential, errors)
>>> credential.username.label('Username:')
<label class="error" for="username">Username:</label>
>>> credential.username.textbox(autocomplete='off')
<input name="username" value="" autocomplete="off"
   class="error" type="text" id="username" />
>>> credential.username.error()
<span class="error">Required field cannot be left blank.</span>

General error message:

>>> errors = {'__ERROR__': ['The username or password provided is incorrect.']}
>>> credential = widget(credential, errors)
>>> credential.error()
<span class="error-message">The username or password
  provided is incorrect.</span>