How does uniapp implement the offline messaging function?

With the popularity and development of mobile Internet, message push has become one of the standard functions of mobile applications. In real application scenarios, users often encounter a situation where when the device cannot connect to the Internet, they may miss some important messages. In order to solve this problem, Jiguang Push provides an offline messaging function, which can temporarily store push messages on the Jiguang server and push them to users again after the device is connected to the Internet. In the uniapp application, the implementation of offline messages is also very simple.

1. Aurora push configuration

First, you need to register a developer account on the Aurora official website and create an application. Then follow the guidelines of the official documentation to complete the basic configuration of the application (such as filling in the application name, package name, signature, etc.), and integrate the Aurora Push SDK into the uniapp application.

2. Offline message settings

In order to use Jiguang’s offline message function, we need to enable the offline message option on Jiguang’s official website console

Next, in the uniapp application Add the following code to the main.js file:

import Vue from 'vue'
import App from './App'

// 引入uni推送插件
import { getRegistrationId } from '@/common/jpush.js'

Vue.config.productionTip = false

App.mpType = 'app'

const app = new Vue({
  ...App
})

// 获取极光注册id
getRegistrationId()

// 将app实例挂载在uni上
uni.$app = app

app.$mount()

In this code, we first introduce a file named "jpush.js", which we need to create manually. Next, we obtain the Aurora registration ID of the device through the "getRegistrationId" method and cache it. The implementation of this method is described in the next section.

3. Offline message acquisition

In the previous section, we mentioned a file named "jpush.js", which will implement the acquisition of the Aurora registration ID of the device, and Cache it. The code of this file is as follows:

// 引入uni-app插件包
import { jpush } from '@uni/plugins'

/**
 * 获取极光注册id
 */
export function getRegistrationId() {
  // 先尝试从缓存中获取
  let registrationId = uni.getStorageSync('jpushRegistrationId')
  if (registrationId) {
    return registrationId
  }
  // 调用极光推送插件获取注册id
  jpush.getRegistrationID({
    success(res) {
      console.log('获取jpush注册id成功', res)
      // 缓存注册id
      uni.setStorageSync('jpushRegistrationId', res.registrationId)
      // 将注册id发送到后台服务器
      sendRegistrationIdToServer(res.registrationId)
    },
    fail(err) {
      console.error('获取jpush注册id失败', err)
    }
  })
}

In the above code, we first try to get the Aurora registration ID of the device from the cache, and if it already exists in the cache, it returns directly. If it does not exist in the cache, call the "getRegistrationID" method of the jpush plug-in in uni-app to obtain the device's registration ID. At this time, the "res" object returned in the successful callback function contains the registration ID information of the device. We cache this registration ID in local storage and send it to the backend server so that when the device cannot connect to the Internet, the server can use this registration ID to temporarily store offline messages on the Aurora server.

4. Check offline messages when the application starts

When the device is reconnected to the Internet, we want to obtain the offline messages temporarily stored by the Jiguang server in order to push them to the user. This process requires checking whether the device has offline messages when the app starts and pushing them to the user one by one. This logic is implemented in the following code:

// 引入uni-app插件包
import { jpush } from '@uni/plugins'

// 在应用启动时检查离线消息
checkOfflineMessage()

/**
 * 应用启动时检查离线消息
 */
function checkOfflineMessage() {
  // 调用极光推送插件获取离线消息
  jpush.getOfflineMessage({
    success(res) {
      console.log('获取离线消息成功', res)
      // 将离线消息依次推送给用户
      res.forEach(message => pushMessageToUser(message))
    },
    fail(err) {
      console.error('获取离线消息失败', err)
    }
  })
}

/**
 * 推送离线消息给用户
 * @param {Object} message 
 */
function pushMessageToUser(message) {
  // 在这里将离线消息推送给用户
  // ...
}

In the above code, we first call the "checkOfflineMessage" method when the application starts to check whether the device has offline messages. In this method, we call the "getOfflineMessage" method in the jpush plug-in in uni-app to obtain offline messages. The "res" object in the success callback function contains all offline message information. Here we can push offline messages to users in sequence.

Summary

Through the introduction of this article, readers can learn how to integrate the Aurora offline messaging function in the uniapp application. Specifically, it includes the following steps:

1. Integration of Aurora Push SDK
2. Enable the offline messaging option in the Aurora official website console
3. Get the Aurora of the device when the application starts Register the ID and cache it in local storage and backend server
4. Check if the device has offline messages when the app starts and push them to the user

By the above In this step, we can implement the offline messaging function in the uniapp application to provide users with a better service experience.

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