Embedded ruby "erb" tags

Question

I have been going through a crash course of Ruby and Ruby on Rails and i can't figure this out: In embedded ruby html files, there are several tags. <% %> for execution <%= %> for output, but what function do these tags serve: <%= -%>, what's with the "-" sign at the end ?

Thanks.

The difference is explained in [this post](http://stackoverflow.com/q/7996695/158689) — Aliaksei Kliuchnikau, Feb 09 '12 at 10:07

score 2 · Accepted Answer · edited Jul 31 '14 at 19:06

2

This link contains a good overview of erb markup.

From the site:

RECOGNIZED TAGS

ERB recognizes certain tags in the provided template and converts
them based on the rules below:
<% Ruby code -- inline with output %>

<%= Ruby expression -- replace with result %>

<%# comment -- ignored -- useful in testing %>

% a line of Ruby code -- treated as <% line %> (optional -- see ERB.new)

%% replaced with % if first thing on a line and % processing is used

<%% or %%> -- replace with <% or %> respectively
All other text is passed through ERB filtering unchanged.

edited Jul 31 '14 at 19:06

jkeuhlen

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answered Feb 09 '12 at 10:08

ksol

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Links is dead. An archived version: http://wayback.archive.org/web/20100215150502/http://cheat.errtheblog.com/s/erb/ – Miscreant Feb 20 '13 at 16:19

score 1 · Answer 2 · edited Oct 28 '12 at 14:36

1

In ruby document there is not the details about this usage <%- or -%>. But it works well by this:

erbA = ERB.new(erbA_str, 1, '-', "@output_buffer")

Notice the 3rd parameter '-' ! It removes the pre or post blanks when using <%- and -%> accordingly.

edited Oct 28 '12 at 14:36

Nat Ritmeyer

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answered Apr 07 '12 at 14:08

fantaxy025025

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Embedded ruby "erb" tags

2 Answers2

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