javascript in my .html.erb using embedded ruby--escaping problems

Question

I'm trying to embed data I have defined in my controller in my view. in view.html.erb:

<script>
some_var = <%= @var_data %>
some_ints = <%= @int_data %>
</script>

in my controller:

@var_data = ['hi', 'bye']
@int_data = [1,2,3,4]

however, when I view the generated html file, it looks like

<script>
some_var = [&quot;hi&quot;, &quot;bye&quot;]
some_ints = [1,2,3,4]
</script>

ie the ints are fine but all the quotes got escaped. I tried

some_var = <%= @var_data.map {|i| i.html_safe} %>

instead but it didn't do anything (and also html_safe didn't work on the whole array). How should I do this?

Thanks

i'm new to js--is it necessary? (also I'm not sure when/if I should be using var in front of my variable names. (using jquery if that matters) — butterywombat
– butterywombat, Commented Feb 3, 2011 at 16:02
oh, i read somewhere ; is only needed if things are on the same line? — butterywombat
– butterywombat, Commented Feb 3, 2011 at 16:09
despite JS can run without semicolons in the end of line, they are necessary. Watch about the semicolon insertion here youtube.com/watch?v=hQVTIJBZook — Mauricio
– Mauricio, Commented Feb 3, 2011 at 16:49

Mauricio · Accepted Answer · 2011-02-03 15:37:27Z

7

have you tried this?

<%=raw @var_data %>

answered Feb 3, 2011 at 15:37

Mauricio

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5 Comments

butterywombat Over a year ago

thanks! that did it. i was trying @var_data.raw instead, which was a nomethoderror.

butterywombat Over a year ago

I didn't find many people having to do this/talk about this though--is it more of a hack or quite common?

Mauricio Over a year ago

I think it's quite common, Rails3 escapes html automatically before printing on an erb for security reasons. But there are some use cases (like yours) when you need to display the raw html.

Phantomwhale Over a year ago

Just spent quite some time looking for this answer, so thanks to poster and answerer ! However, I had to actually use <%= raw @var_data.collect{|c| '"'+c+'"'}.join(",")%> to get the output of "hi", "bye" - using just <%=raw @var_data %> got me just hibye

Jason Kim Over a year ago

This is so useful! Thank you. I've been searching for this solution everywhere.

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