From: "Aaron D. Gifford" <astounding@...>
Date: 2011-12-09T05:44:39+09:00
Subject: Re: Truncation using Pixels

If you're rendering in a web browser, unless you're using some sort of
Ruby plugin within the browser, you very likely won't ever be able to
know text width in pixels unless you were to implement a server-side
test renderer that used exactly the same algorithms and font data that
the browser did.

Your question looks a lot like this one in a sense:

http://stackoverflow.com/questions/118241/calculate-text-width-with-javascript

You could possibly do this within the browser using JavaScript and one
of the proposed text measuring methods the above link includes by
test-rendering a string (keeping it hidden so it's not actually seen
by the browser user), then adjusting your truncation (binary search
for optimum truncation width, maybe?).

Aaron out.