FormEncode Example 1 (FormExample1)

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"""Demo for using FormEncode with Webware."""

# Tested with Webware 1.1 and FormEncode 1.2.2

from formencode import compound, Invalid, htmlfill, Schema, validators
from WebKit.Examples.ExamplePage import ExamplePage


form_template = '''<h2>Tell me about yourself</h2>

<form action="FormExample1" method="POST">

<p><label for="name">Your name:</label><br>
<form:error name="name">
<input type="text" id="name" name="name"></p>

<p><label for="age">Your age:</label><br>
<form:error name="age">
<input type="text" id="age" name="age"></p>

<p>Your favorite color:<br>
<form:error name="color">
<input type="checkbox" value="red" name="color"> Red &nbsp;
<input type="checkbox" value="blue" name="color"> Blue &nbsp;
<input type="checkbox" value="black" name="color"> Black &nbsp;
<input type="checkbox" value="green" name="color"> Green</p>

<p><input type="submit" value="Submit"></p>
</form>'''


class FormSchema(Schema):
    name = validators.String(not_empty=True)
    age = validators.Int(min=13, max=99)
    color = compound.All(validators.Set(),
        validators.OneOf(['red', 'blue', 'black', 'green']))


class FormExample1(ExamplePage):
    """Demo for using FormEncode with Webware."""

    def getDefaults(self):
        return dict(age='enter your age', color=['blue'])

    def writeStyleSheet(self):
        ExamplePage.writeStyleSheet(self)
        self.writeln('''<style type="text/css">
.error {background-color: #fdd}
.error-message {color:#a00}
</style>''')

    def awake(self, trans):
        ExamplePage.awake(self, trans)
        if self.request().hasField('name'):
            fields = self.request().fields()
            try:
                fields = FormSchema.to_python(fields, self)
            except Invalid, e:
                errors = dict((k, v.encode('utf-8'))
                    for k, v in e.unpack_errors().iteritems())
            else:
                errors = None
        else:
            fields = self.getDefaults()
            errors = None
        self.rendered_form = htmlfill.render(form_template,
            defaults=fields, errors=errors)

    def writeContent(self):
        self.write(self.rendered_form)