Why does the error "TypeError: newsList is not a function" occur?

Question

JavaScript

newsList = (news_id) ->
  alert news_id
  return

In the html code I write this:

<script>
  newsList(10);
</script>

In response, I get this error:
TypeError: newsList is not a function. (In 'newsList(10)', 'newsList' is an instance of HTMLDivElement)
(anonymous function)
What's the problem then? Judging by the CoffeeScript documentation, functions are written exactly like this... Well, in JS they are called exactly like that.

Answer 1

This is because newsList will be declared in the local scope, your code will be wrapped in (function() {...}).call(this);
If you want to use it as in your example, you need to explicitly specify it:

window.newsList = (news_id) ->
  alert news_id
  return