func (r *FormRenderer) WriteHelp(w io.Writer, field *form.Field, help string) error {
span := html.Span(html.Text(help))
span.Attrs = html.Attrs{"class": "help-block"}
_, err := span.WriteTo(w)
return err
}
func (r *FormRenderer) WriteError(w io.Writer, field *form.Field, err error) error {
span := html.Span(html.Text(err.Error()))
span.Attrs = html.Attrs{"class": "help-block"}
_, werr := span.WriteTo(w)
return werr
}