Rails + JS - Using instance variable (array of arrays with strings)

Question

I have the following in a html.erb file:

<%= @location_list = [['test',2]] %>
<script type="text/javascript">
 var test = <%= @location_list.to_json %>
 alert(test);
</script>

And the alert is not showing up.

However if I do <%= @location_list = [[3,2]] %> - The alert is showing up.

Why?

Kyle. Doing @location_list.to_json.html_safe did the trick, but I don't know why. — Hommer Smith
– Hommer Smith, Commented Mar 20, 2012 at 5:06

Ben Zhang · Accepted Answer · 2012-03-20 22:42:31Z

1

<%= %> tag means output something. In your case, you probably dont want to output anything, so I guess you are looking for <% @location_list = [['test',2]] %>, which means normal statement no output will be involved

Sorry, havn't really answer your question.

var test = <%= @location_list.to_json %>

should be

var test = "<%=j @location_list.to_json %>"

edited Mar 20, 2012 at 22:42

answered Mar 20, 2012 at 0:32

Ben Zhang

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