Ruby array to js array in .js.erb file on rails

Question

I'm trying to turn a ruby array into a js array in a js.erb file. I've checked all questions on this in stack overflow but it isn't working for me.

Here is the function

  function c(c) {
   js_array = <%= raw @keys.to_json %>;
   b.selection.remove(), b.html.insert('js_array[0]');
    }

It throws the error Uncaught TypeError: Cannot read property '0' of null

Im still learning js so im not sure what is going wrong here

The ruby @keys array defiantly has data in it because I'm printing that on the same page.

And if i change the array to js_array = ['gwfe', 'efw', 'efwe']; it works fine. This makes me believe something is going wrong when trying to convert the ruby array into a js array.

Todd Drinkwater · Accepted Answer · 2021-05-06 19:53:47Z

4

After converting the array to JSON, you just need to mark it as HTML safe so it will render Javascript code.

This will do the trick:

<%= @keys.to_json.html_safe %>

answered May 6, 2021 at 19:53

Todd Drinkwater

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Jeremy Rajan · Accepted Answer · 2016-01-18 02:32:13Z

1

I assume, you are gettings @keys data from db or local. Could you try gon gem to pass the values from ruby to js. Here is the railscast tutorial for the same: http://railscasts.com/episodes/324-passing-data-to-javascript?view=asciicast

And see, if that works.

Let me know.

edited Jan 18, 2016 at 2:32

answered Jan 18, 2016 at 0:57

Jeremy Rajan

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12 Comments

Rob Over a year ago

Changed it to js_array = <%=raw @keys.to_a%>; and it still doesn't work.

Jeremy Rajan Over a year ago

Could you, pass me the print output for @keys.to_a and try removing raw from the print?

Jeremy Rajan Over a year ago

Could you try this and see this as well js_array = <%=escape_javascript @keys.to_json %> ?

Jeremy Rajan Over a year ago

Well, that is an extra step which I feel is un-necessary. Can you move the js function from erb file to your rails view and see how it goes? The one which contains escape js.

Jeremy Rajan Over a year ago

Might as well, look into this as well. railscasts.com/episodes/…

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