How to set page refresh in uniapp

When developing uniapp applications, we often encounter situations where the page needs to be refreshed, such as the page needs to be re-rendered after the data is updated. Therefore, how to set up page refresh in the uniapp application has become a very important issue.

This article will introduce several common methods of setting page refresh in uniapp to help developers better deal with this problem.

1. Using vue's life cycle

In vue, the component's life cycle function provides a series of methods to monitor the component's life cycle events, including beforeCreate, created, beforeMount, mounted , beforeUpdate, updated, beforeDestroy and destroyed, etc.

Among them, the mounted and updated life cycle functions are very suitable for page refresh. The mounted lifecycle function is called immediately after the component is mounted, while the updated lifecycle function is called immediately after the component is updated. Therefore, we can use these two functions to monitor page changes and re-render the page.

The specific implementation method is as follows:

<template>
  <div>
    <!-- 页面内容 -->
  </div>
</template>

<script>
export default {
  data() {
    return {
      data: []
    }
  },
  mounted() {
    this.getData()
  },
  methods: {
    // 获取数据
    async getData() {
      // 发送请求获取数据
      const res = await this.$http.get('/api/data')
      // 将数据保存到data中
      this.data = res.data
      // 调用$nextTick方法以便更新完成后再进行操作
      this.$nextTick(() => {
        // 进行页面刷新
        window.location.reload()
      })
    }
  }
}
</script>

In this example, we send a request to obtain data in the mounted function, and then use the $nextTick method to ensure that the page is refreshed after the data update is completed. The window.location.reload method is used here to refresh the page.

2. Use the API provided by uniapp

In addition to using vue's life cycle function to refresh the page, uniapp also provides some APIs to facilitate developers to refresh the page.

1. Page refresh by switching routes

uniapp provides a uni.reLaunch method, which can be used to close all pages and open a new page. Through this method, we can refresh the page.

The specific implementation method is as follows:

<template>
  <div>
    <!-- 页面内容 -->
  </div>
</template>

<script>
export default {
  data() {
    return {
      data: []
    }
  },
  async getData() {    
    // 发送请求获取数据
    const res = await this.$http.get('/api/data')
    // 将数据保存到data中
    this.data = res.data
    // 调用uni.reLaunch方法进行页面刷新
    uni.reLaunch({
      url: '/pages/xxx/xxx'
    })
  }
}
</script>

In this example, we refresh the page by calling the uni.reLaunch method. It should be noted that when calling this method, you need to pass in the path of the newly opened page.

2. Use event bus to implement page refresh

uniapp also provides an EventBus event bus, which can be used to uniformly manage communication between components. Through the publish-subscribe model, we can achieve real-time updates of the page.

The specific implementation method is as follows:

• Create a new EventBus.js file in the common directory:

import Vue from 'vue'
export default new Vue()

• In the component that needs to refresh the page , listen for events:

import EventBus from '@/common/EventBus.js'

export default {
  data() {
    return {
      data: []
    }
  },
  mounted() {
    this.getData()
  },
  methods: {
    async getData() {
      const res = await this.$http.get('/api/data')
      this.data = res.data
      // 触发事件，通知其他订阅者进行更新
      EventBus.$emit('data-change')
    }
  }
}

• In the component that needs to update data, subscribe to events:

import EventBus from '@/common/EventBus.js'

export default {
  data() {
    return {
      data: []
    }
  },
  mounted() {
    // 订阅事件
    EventBus.$on('data-change', () => {
      this.getData()
    })
  },
  methods: {
    async getData() {
      const res = await this.$http.get('/api/data')
      this.data = res.data
    }
  }
}

In this example, we operate EventBus Listen and subscribe, and notify other subscribers to update by triggering events after the data update is completed. In this way, the effect of refreshing the page in real time can be achieved.

To sum up, uniapp provides a variety of ways to refresh the page. Developers can choose the most suitable method for application development according to specific requirements.

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