How do you pass variables to main in Dart?

Question

I'm using Dart in a Django application. There are configuration parameters that need to be passed to Dart. How do you pass values to main()? At this point I'm considering creating hidden elements in the web page and using query to get the values. Is there a better approach?

Answer 1

Sounds like you are building a browser app?

(BTW, you can use new Options().arguments for command-line apps. Works great, but obviously there is no command line in browser apps :)

(Second, main() doesn't take arguments, so we have to find another way.)

OK, for a browser-app, what I might try doing is embedding some JSON into the page inside a <script> tag. Then, using query, find that element, parse the contents, and you're good to go.

In your HTML:

<script id="config">
  {"environment":"test"}
</script>

And in your Dart file:

import 'dart:html';
import 'dart:json' as json;

void main() {
  var config = json.parse(query("#config").innerHtml);

  print(config['environment']);
}

Hope that helps!