[Mini program taro best practice] Asynchronous action elegant practice (simplified process)

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Overview

When we got the official action of project requests
you need to write two functions (a return type, a dispatch), super trouble, as shown below.

function articleList(data) {
  return { type: LIST, payload: data }
}

export function list() {
  console.log('list')
  return (dispatch) => {
    Taro.request({
      url: 'http://api.shudong.wang/v1/article/list',
      data: {
        foo: 'foo',
        bar: 10
      },
      header: {
        'content-type': 'application/json'
      }
    }).then((res) => {
      dispatch(articleList(res.data.article)) // 需要在另一个函数 dispatch
    })
  }
}

If every function is written like this, it will be extremely painful and a lot of redundant code, so how should we design it?

design

• Parameters: type type, function (automatic dispatch)

After this design, we can use actions extremely simply

/**
 * 创建API Action
 *
 * @export
 * @param actionType Action类型
 * @param [func] 请求API方法，返回Promise
 * @returns 请求之前dispatch { type: ${actionType}_request }
 *          请求成功dispatch { type: ${actionType}, payload: ${resolveData} }
 *          请求失败dispatch { type: ${actionType}_failure, payload: ${rejectData} }
 */
export function createApiAction(actionType, func = () => {}) {
  return (
    params = {},
    callback = { success: () => {}, failed: () => {} },
    customActionType = actionType,
  ) => async (dispatch) => {
    try {
      dispatch({ type: `${customActionType  }_request`, params });
      const data = await func(params);
      dispatch({ type: customActionType, params, payload: data });

      callback.success && callback.success({ payload: data })
      return data
    } catch (e) {
      dispatch({ type: `${customActionType  }_failure`, params, payload: e })

      callback.failed && callback.failed({ payload: e })
    }
  }
}

Minimal use

With the encapsulated API asynchronous action described in the previous article, it has become so simple

import { createApiAction } from './index'

export const list = createApiAction(LIST, params => api.get('news/list', params))

All codes

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