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Editorial Team
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Asked: 2026-05-18T20:23:57+00:00

I need to get a ruby array in to a javascript array and I’m

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I need to get a ruby array in to a javascript array and I’m getting a parse error.

var characters = <%= @poop.to_json %>;

That is how I’m embedding ruby into inline javascript and it’s coming up with a parse error. How should I be getting this ruby array into javascript?

I’m embedding this into an .html.erb file so ruby should be getting to the variable before javascript.

This is what safari console is showing:

alt text

Update

I had a form that had three fields js, css, and html respectively so I would put my javascript in a form and then it would put it into the header.

<head>
  <%= @game.javascript %>
 </head>

So as you can see I was embedding ruby in javascript that was the output of a ruby object so the reason ruby wasn’t getting to it first was that it had already got to it and treated the <%= %> just like another string.

Ahh, I up voted you all for the help. Thanks!

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1 Answer

  1. Editorial Team

    You’re treating a .js file like an .erb file – it’s not. JavaScript files aren’t parsed by Ruby – anything in public is sent as-is.

    One way to get @poop into your JavaScript is to have a Rails action that renders json, then load that with XHR.

    Alternatively, you could output @poop in the HTML template in a <script> tag, then load the contents of that script tag from your JavaScript.

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