crispy_forms_field.py 文件源码

def render(self, context):
        # Nodes are not threadsafe so we must store and look up our instance
        # variables in the current rendering context first
        if self not in context.render_context:
            context.render_context[self] = (
                template.Variable(self.field),
                self.attrs,
                template.Variable(self.html5_required)
            )

        field, attrs, html5_required = context.render_context[self]
        field = field.resolve(context)
        try:
            html5_required = html5_required.resolve(context)
        except template.VariableDoesNotExist:
            html5_required = False

        widgets = getattr(field.field.widget, 'widgets', [field.field.widget])

        if isinstance(attrs, dict):
            attrs = [attrs] * len(widgets)

        for widget, attr in zip(widgets, attrs):
            class_name = widget.__class__.__name__.lower()
            class_name = class_converter.get(class_name, class_name)
            css_class = widget.attrs.get('class', '')
            if css_class:
                if css_class.find(class_name) == -1:
                    css_class += " %s" % class_name
            else:
                css_class = class_name

            if (
                TEMPLATE_PACK == 'bootstrap3'
                and not is_checkbox(field)
                and not is_file(field)
            ):
                css_class += ' form-control'

            widget.attrs['class'] = css_class

            # HTML5 required attribute
            if html5_required and field.field.required and 'required' not in widget.attrs:
                if field.field.widget.__class__.__name__ is not 'RadioSelect':
                    widget.attrs['required'] = 'required'

            for attribute_name, attribute in attr.items():
                attribute_name = template.Variable(attribute_name).resolve(context)

                if attribute_name in widget.attrs:
                    widget.attrs[attribute_name] += " " + template.Variable(attribute).resolve(context)
                else:
                    widget.attrs[attribute_name] = template.Variable(attribute).resolve(context)

        return field