Question

将对象从Javascript转换为Dart类计数器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并将其转换为什么？建立工厂？
Dart中是否有内置的东西，我不知道会处理这个问题？

处理此问题的首选dart方式是什么？

Answer 1

有几个库允许从JSON数据创建Dart对象。请参阅morph，dartson或serialization。

您还可以通过添加如下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'];
}

将JS对象转换为Dart类

1 个答案: