How I Can truncate in show_placeholder

[Eliezer J Romero C]

Hi everybody, I have a doubt with show_placeholder ,I need truncate or cut the number of characters that brings show_placeholder!

What is the correct method to do this? 

I've tried "truncateword"  but I understand that is not within attributes show_placeholder

[Martin Koistinen]

Heres what I do:

{% render_placeholder myobj.content as content %}{{ content|striptags|truncatewords:50 }}

I had to add the "as" form to render_placeholder to do it, but now its there for everyone =)