Mapにデコードしてjsonパイプを噛ませる

ajax_component.dart

library component.ajax;

import "package:angular2/angular2.dart";
import "dart:html";
import 'dart:convert';

@Component(selector: "ajax-data")
@View(
    template: "<p>{{ data | json }}</p><button (click)='getData()'>Get data.json</button>")
class AjaxComponent {
  Map<String, dynamic> data;

  AjaxComponent() {
    data = {};
  }

  getData() async {
    this.data = await HttpRequest.request("./data/data.json").then((req) {
      return JSON.decode(req.responseText);
    });
  }
}