New dart.js bootstrap script for apps

client/dart.js

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Bootstrap support for Dart scripts on the page as this script.
+
+if (!document.implementation.hasFeature('dart', '1.0')) {
+  window.addEventListener("DOMContentLoaded", function (e) {
+      // Fall back to compiled JS.

[danrubel, 2012/01/20 21:20:36]

Do we need a "is Dart available in this browser" check here so that samples will
run "natively" in Dartium?

[vsm, 2012/01/20 21:55:27]

Line 7 is that check.  Note, we will probably change how to do the check, but
only this file needs updating.

+      var scripts = document.getElementsByTagName("script");
+      var length = scripts.length;
+      for (var i = 0; i < length; ++i) {
+        if (scripts[i].type == "application/dart") {
+          var script = document.createElement('script');
+          // Remap foo.dart to foo.js.
+          // TODO:
+          // - Support in-browser compilation.
+          // - Handle inline Dart scripts.
+          if (scripts[i].src && scripts[i].src != '') {
+            script.src = scripts[i].src + '.js';
+            document.body.appendChild(script);

[dgrove, 2012/01/20 20:57:03]

won't this break scripts that want to look at their parent? (e.g., they're
counting on executing at a specific point in the DOM?)

[vsm, 2012/01/20 21:55:27]

Modified to replace the original script.

On 2012/01/20 20:57:03, dgrove wrote:

+          }
+        }
+      }
+    }, false);
+}