1

将对象从 Javascript 转换为 Dart 类对应部分的最佳模式是什么?

// car.dart
import 'part.dart';
class Car {
  String paintColor;
  List<Part> parts;
}

// part.dart
class Part {
  String name;
  String SKU;
}

// main.dart
import 'dart:html';
import 'dart:js';

import 'car.dart';

void main() {
  var body = document.querySelector('body');
  body.addEventListener('carSelect', loadCarHandler, false);
}

void loadCarHandler(event) {

  // this is the contents of a CustomEvent from outside dart
  // goal is to convert it into Car and Parts
  LinkedHashMap obj = event.detail;

  /*
  this is what the `obj` looks like inside the debugger
  obj = _LinkedHashMap
    :paintColor = 'Red'
    :parts = List[2]
      0 = _LinkedHashMap
        :name = 'Wheel'
        :SKU = 'Z123
      1 = _LinkedHashMap
        :name = 'Tire'
        :SKU = 'Z456'
  */

}

我应该在处理程序中进行转换吗?
允许构造函数获取 LinkedHashMap 并在那里转换它?
创建工厂?
Dart 中是否有内置的东西我不知道可以处理这个问题?

处理此问题的首选飞镖方式是什么?

4

1 回答 1

4

有几个库允许从 JSON 数据创建 Dart 对象。请参阅morphdartsonserialization

您还可以通过添加这样的构造函数来避免镜像:

class Car {
  String paintColor;
  List<Part> parts;

  Car();
  Car.fromJson(json)
      : paintColor = json['paintColor'],
        parts = json['parts'].map((e) => new Part.fromJson(e)).toList();
}

class Part {
  String name;
  String SKU;

  Part();
  Part.fromJson(json)
      : name = json['name'],
        SKU = json['SKU'];
}
于 2014-04-11T20:43:08.063 回答