最有效的Aurelia绑定方式为单身对象 [英] Most efficient Aurelia binding way for a singleton object

问题描述

这是一个非常基本的JavaScript和Aurelia问题。

Here's a pretty fundamental JavaScript and Aurelia question.

假设我有一个单例对象，例如 User 它通常会从服务器获取更新，它返回一个全新的用户对象。

Let's say that I have a singleton object, for example User and it would often get updates from the server, which returns a whole new User object.

现在，要更新视图，我有两个选项（我知道）：

Now, to push the update to the views, I have two options (that I know of):

1. 更新现有的每个属性用户到新的用户的手动（这也需要映射每个属性）。

1. Update every property of the existing User to that of the new User's manually (this would also require mapping every property).

替换对象引用，并为所有侦听器推送 EventAggregator 通知，以重新查询用户对象

Replace the object reference and push an EventAggregator notification for all listeners to re-query the User object.

我目前已经选择了1号选项，问题，但没有阻止。

I have currently gone for option number 1, which has raised some issues, but nothing blocking.

哪一个更有效率和/或提供更多的优势？

Which one would be more efficient and/or provide more benefits over the other?

推荐答案

这是我的意见n。您不必使用 EventAggregator ，您也不必为更新每个资源而奋斗。您可以创建助手类（ AppState 或某些东西）来保存您的用户对象。在您的元素中，注入 AppState 类，并创建一个getter函数来返回 User 对象（使用 @computedFrom 或 aurelia-calculated 以避免脏检查）。例如：

Here's my opinion. You don't have to use EventAggregator, and you also don't have to struggle updating every property. You could create helper class (AppState or something) to hold your User object. In your elements, inject the AppState class and create a getter function to return the User object (use @computedFrom or aurelia-computed to avoid dirty-checking). For example:

JS

import { AppState, MyClass } from './app-state';
import { computedFrom } from 'aurelia-framework';

export class MyElement {

  static inject = [AppState];

  constructor(appState) {
    this.appState = appState;

  }

  @computedFrom('appState.obj')
  get obj() {
    return this.appState.obj;
  }

  updateObject() {
    this.appState.obj = new MyClass(); 
  }
}

HTML

<template>
  <h1>Element 1</h1>
  <button click.delegate="updateObject()">Update Object</button>
  <br><br>
  ${obj.p1} 
  <br><br><br>
  ${obj.p2}
</template>

运行示例 https://gist.run/?id=f2ed9769343513b0819115863ff64c34

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