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Demo: Select Widget (with optgroup and label attributes)

Captured submission

None

Code (click to show in context) 

    @view_config(
        renderer="templates/form.pt",
        name="select_with_optgroup_and_label_attributes",
    )
    @demonstrate("Select Widget (with optgroup and label attributes)")
    def select_with_optgroup_and_label_attributes(self):

        # One may or may not notice any difference with
        # 'select_with_optgroup' above, depending on the browser being
        # used. See widget's documentation for further details.
        from deform.widget import OptGroup

        choices = (
            ("", "Select your favorite musician"),
            OptGroup(
                "Guitarists",
                ("page", "Jimmy Page"),
                ("hendrix", "Jimi Hendrix"),
            ),
            OptGroup(
                "Drummers",
                ("cobham", "Billy Cobham"),
                ("bonham", "John Bonham"),
            ),
        )

        long_label_gener = lambda group, label: " - ".join(  # noQA
            (group, label)
        )

        class Schema(colander.Schema):
            musician = colander.SchemaNode(
                colander.String(),
                widget=deform.widget.SelectWidget(
                    values=choices, long_label_generator=long_label_gener
                ),
            )

        schema = Schema()
        form = deform.Form(schema, buttons=("submit",))

        return self.render_form(form)