form.py 文件源码

def hidden_tag(self, *fields):
        """
        Wraps hidden fields in a hidden DIV tag, in order to keep XHTML
        compliance.

        .. versionadded:: 0.3

        :param fields: list of hidden field names. If not provided will render
                       all hidden fields, including the CSRF field.
        """

        if not fields:
            fields = [f for f in self if _is_hidden(f)]

        rv = [u'<div style="display:none;">']
        for field in fields:
            if isinstance(field, string_types):
                field = getattr(self, field)
            rv.append(text_type(field))
        rv.append(u"</div>")

        return Markup(u"".join(rv))