It's pretty basic:
<%= foo %> means print whatever is inside to the output. In Rails 2.3,
it means literally print it whatever it is. In Rails 3 and up, it
means html-escape it and print it.
<% foo %> means this is an instruction line, a bit of Ruby mixed in
among the HTML. You use this to start and end your loops over a
collection, or put an island of logic or data in the view. If you put
a puts command in there, then it's functionally the same thing as the
first one, but if you don't explicitly print anything, it's just a
program step.
<%- foo -%> means this is an instruction line, but in addition, don't
leave an extra line of whitespace where it was, just do the Ruby
instruction and don't add any whitespace.
Walter
On Jul 25, 2011, at 8:30 PM, Hassan Schroeder wrote:
On Mon, Jul 25, 2011 at 5:24 PM, Barney <[email protected]> wrote:
Do you have a link where I can read about the differences between <
%= ... , <%-... and <% ? I haven't spotted that in the "Agile Web
Development with Rails" book I'm reading.
Look in the index for "ERb" -- my old second edition covers this on
page 40-43.
HTH,
--
Hassan Schroeder ------------------------ [email protected]
http://about.me/hassanschroeder
twitter: @hassan
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