小编典典

您如何在Aurelia中替代HttpClient?

json

我是Aurelia的新手。

您将如何更改以下代码以提供虚拟HttpClient,例如json读取器,而不是仅提供静态json数据集,从而无需开发服务器。

import {inject} from 'aurelia-framework';
import {HttpClient} from 'aurelia-fetch-client';

@inject(HttpClient)
export class Users {
  heading = 'Github Users';
  users = [];

  constructor(http) {
    http.configure(config => {
      config
        .useStandardConfiguration()
        .withBaseUrl('https://api.github.com/');
    });

    this.http = http;
  }

  activate() {
    return this.http.fetch('users')
      .then(response => response.json())
      .then(users => this.users = users);
  }
}

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2020-07-27

共1个答案

小编典典

要使原始文章中的演示代码达到可以替代HttpClient实现的状态,需要执行几个步骤。

第1步

在类的构造函数中删除配置代码…

这些行:

users.js

...
http.configure(config => {
  config
    .useStandardConfiguration()
    .withBaseUrl('https://api.github.com/');
});
...

应移至main.js文件:

main.js

export function configure(aurelia) {
  aurelia.use
    .standardConfiguration()
    .developmentLogging();

  configureContainer(aurelia.container);  // <--------

  aurelia.start().then(a => a.setRoot());
}

function configureContainer(container) {
  let http = new HttpClient();
  http.configure(config => {
    config
      .useStandardConfiguration()
      .withBaseUrl('https://api.github.com/');
  });
  container.registerInstance(HttpClient, http); // <---- this line ensures everyone that `@inject`s a `HttpClient` instance will get the instance we configured above.
}

现在我们的users.js文件应如下所示:

users.js

import {inject} from 'aurelia-framework';
import {HttpClient} from 'aurelia-fetch-client';

@inject(HttpClient)
export class Users {
  heading = 'Github Users';
  users = [];

  constructor(http) {
    this.http = http;
  }

  activate() {
    return this.http.fetch('users')
      .then(response => response.json())
      .then(users => this.users = users);
  }
}

第2步:

模拟HttpClient。

user.js模块仅使用fetch方法,该方法返回Response具有json方法的对象。这是一个简单的模拟:

let mockUsers = [...todo: create mock user data...];

let httpMock = {
  fetch: url => Promise.resolve({
    json: () => mockUsers
  })
};

第三步:

重新配置容器以使用http模拟:

在第1步中,我们向模块中添加了一个configureContainer函数,该函数main.js在容器中注册了已配置的HttpClient实例。如果我们想使用模拟版本,该configureContainer函数将更改为:

main.js

...

let mockUsers = [...todo: create mock user data...];

let httpMock = {
  fetch: url => Promise.resolve({
    json: () => mockUsers
  })
};

function configureContainer(container) {      
  container.registerInstance(HttpClient, httpMock);
}

有关在此处配置容器的更多信息:https : //github.com/aurelia/dependency-
injection/issues/73

2020-07-27