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Asked: 2026-06-03T06:44:32+00:00

I have the following coffeescript code to generate and alert box: show_alert = ()

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I have the following coffeescript code to generate and alert box:

show_alert = () ->
  alert("Hello! I am an alert box!")

which compiles to:

(function() {
  var show_alert;

  show_alert = function() {
    return alert("Hello! I am an alert box!");
  };

}).call(this);

in my html I have the following

<input onclick='show_alert()' type='button' value='Show alert box' />

However, no alert box shows? The following is the html copied from the browser:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
  <head>
    <title>Test Rails Application</title>
    <style type='text/css'>.application h1 {
  color: lime; }
</style>
    <script type='text/javascript'>(function() {
  var show_alert;

  show_alert = function() {
    return alert("Hello! I am an alert box!");
  };

}).call(this);
</script>
  </head>
  <body>
    <h1>Hello from applicaiton.html.haml</h1>
    <div class='application'><h1>Hello World</h1>
<input onclick='show_alert()' type='button' value='Show alert box' />
</div>
  </body>
</html>

Why am I not able to get an alert box to show up?

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1 Answer

  1. Editorial Team

    Your problem is that the generated javascript code is in another scope. You have to solve this
    by either adding the -b parameter to the coffeescript compiler or export your function
    explicitly via

    root = exports ? this
root.show_alert = () -> alert("Hello! I am an alert box!")

    For more information about the exporting and scope issue have a look at https://stackoverflow.com/a/4215132/832273

    I created a working jsfiddle with the above coffeescript code

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