I am new to Dart. To become familiar with Dart, I created this script. It works fine with the editor and pub serve. But pub serve dart2js logs these two warnings, which I do not understand:
coloring.dart:
import 'dart:math';
import 'dart:html';
import 'dart:async';
const String CLICK_ME = 'Click me to pause!';
void randomColoring(StreamSubscription subscription) {
final Random random = new Random();
final Element intro = querySelector("#intro");
final ElementList<Element> boxes = querySelectorAll('.box');
final Element info = querySelector("#info");
subscription.onData((eventValue) {
var box = random.nextInt(boxes.length); /// WARNING
var hexCssColor = random.nextInt(0xFFFFFF + 1).toRadixString(16)
.padLeft(6, "0").toUpperCase();
boxes[box].style.background = "#$hexCssColor"; /// WARNING
info.text = eventValue.toString();
print("box: $box - hexCssColor: $hexCssColor - count: $eventValue");
});
var text = intro.text;
intro
..text = CLICK_ME
..onClick.listen((mouseEvent) {
if (subscription.isPaused) {
intro.text = CLICK_ME;
subscription.resume();
} else {
intro.text = text;
subscription.pause();
}
});
}
There is a bug for the []
operator of ElementList
https://code.google.com/p/dart/issues/detail?id=19628 (fixed at June 26).
What Dart version are you using?
I wasn't able to find something about length
but I guess it's a bug in Dart2JS.
You can report it at http://dartbug.com/new
But maybe the fix for the []
bug applies here as well.