Accessing/modifying Ruby class attributes in Javascript/JQuery

Question

I am trying to access Ruby class attributes in a JS/JQ file.

Example:

class my_class
  attr_acessor :my_attr
end

In the Javascript, how can I access and modify this?

$('my_class').???

Community · Accepted Answer · 2017-05-23 11:52:29Z

1

ANSWER FOR UPDATED QUESTION

You cannot modify a Ruby object from JavaScript.

ANSWER FOR ORIGINAL QUESTION

You need to embed your Ruby code in JavaScript. Your js/html file must end in js.erb or html.erb.

Here is a quick example:

<script>
  var javascript_variable_attr = <%= @instance_of_my_class.my_attr %>
</script>

And FYI you cannot modify the Ruby object because you are not accessing the object in memory. Embedding Ruby will simply render the value into the js/html file. In other words, it is read only.

edited May 23, 2017 at 11:52

CommunityBot

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answered Jun 23, 2015 at 16:55

Mike S

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2 Comments

Aleksei Matiushkin Over a year ago

There is no templating engine, save for erb, huh?

Mike S Over a year ago

There is mustache if you don't like erb. It's much cleaner. But at a low level it's basically the same thing. github.com/mustache/mustache

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