drag_and_drop.js

// Wrapper for RequireJS. It will make the standard requirejs(), require(), and
// define() functions from Require JS available inside the anonymous function.
//
// See https://edx-wiki.atlassian.net/wiki/display/LMS/Integration+of+Require+JS+into+the+system
(function (requirejs, require, define) {

requirejs.config({
    'baseUrl': '/static/js/capa/drag_and_drop/'
});

// The current JS file will be loaded and run each time. It will require a
// single dependency which will be loaded and stored by RequireJS. On
// subsequent runs, RequireJS will return the dependency from memory, rather
// than loading it again from the server. For that reason, it is a good idea to
// keep the current JS file as small as possible, and move everything else into
// RequireJS module dependencies.
requirejs(['main'], function (Main) {
    Main();
});

// End of wrapper for RequireJS. As you can see, we are passing
// namespaced Require JS variables to an anonymous function. Within
// it, you can use the standard requirejs(), require(), and define()
// functions as if they were in the global namespace.
}(RequireJS.requirejs, RequireJS.require, RequireJS.define)); // End-of: (function (requirejs, require, define)