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Editorial Team
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Asked: 2026-06-11T14:14:00+00:00

I have been using vanilla javascript and im just rendering a simple alert message

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I have been using vanilla javascript and im just rendering a simple alert message but it renders the JS code as plane string in view. Here is my code

def index
render :js => "alert('Hello Rails');"
end

It renders the same string “alert(‘Hello Rails’);” for me in view instead of a alert message.
Im in Rails 3 and as Rails guide the code looks ok.

Any answers would be appreciated. Thanks

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1 Answer

  1. Editorial Team

    Compare two following snippets:

    <!DOCTYPE HTML>
<html lang="en-US">
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
    <script>
    alert('Hello Rails');
    </script>
</body>
</html>

<!DOCTYPE HTML>
<html lang="en-US">
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
    alert('Hello Rails');
</body>
</html>

    First one generates alert message, second just shows the the string. Browsers do not execute JS code unless it is wrapped with <script> tag. jQuery ajax calls in the @Erez answer also wrap response with <script> internally.

    So if you access your action directly try to wrap it with <script> , or, better, use javascript_tag helper (http://api.rubyonrails.org/classes/ActionView/Helpers/JavaScriptHelper.html#method-i-javascript_tag)

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