forms.py 文件源码

def __call__(self, field, **kwargs):
        """Render widget."""
        kwargs.setdefault('id', field.id)
        html = ["<!-- data: %r -->" % (field.data, ), '<div %s>' % html_params(**kwargs)]
        html.extend(self.render_select("year", field))
        html.extend(self.render_select("month", field))
        html.extend(self.render_select("day", field))
        html.append("</div>")
        return HTMLString(''.join(html))