How to render data after uniapp network request

Uniapp is a cross-platform development framework that can easily publish an application to multiple platforms, such as iOS and Android. In Uniapp, we can use Vue.js to write applications, and after network requests, we can use Vue's data binding function to dynamically render data.

Network request is a very common operation, which can obtain data from the server. In Uniapp, we can use uni.request() to make network requests. This function accepts an object as a parameter, which contains some configuration information of the request, such as the requested URL, the requested method, and the requested data. The following is a simple example:

uni.request({
  url: 'https://api.example.com/data',
  method: 'GET',
  success: function(res) {
    console.log(res.data)
  }
})

From the above example, we can see that we can obtain the data returned by the server through the success callback function. In Vue, we can encapsulate this data in a data object and bind it to the view. The following is a simple example:

<template>
  <div>
    <ul>
      <li v-for="item in items">{{ item.name }}</li>
    </ul>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: []
    }
  },
  mounted() {
    uni.request({
      url: 'https://api.example.com/data',
      method: 'GET',
      success: (res) => {
        this.items = res.data
      }
    })
  }
}
</script>

From the above example, we can see that we first define a data object and bind it to the view. In the mounted hook function, we make a GET request to the server, and after the request is successful, the obtained data is assigned to the items object in data. Since we have bound the items object to a list in the view, we can see that the data in the list changes when our request is successful.

In actual development, we also need to consider some error handling situations. For example, we need to catch a request timeout error and give the user a friendly prompt when the error occurs. For this situation, we can use the fail and complete callback functions provided by uni.request(). The following is a simple example:

<template>
  <div>
    <ul>
      <li v-for="item in items">{{ item.name }}</li>
    </ul>
    <p v-if="error">{{ error }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: [],
      error: ''
    }
  },
  mounted() {
    uni.request({
      url: 'https://api.example.com/data',
      method: 'GET',
      success: (res) => {
        this.items = res.data
      },
      fail: (err) => {
        this.error = '网络异常，请检查您的网络设置'
      },
      complete: () => {
        console.log('请求完成')
      }
    })
  }
}
</script>

From the above example, we can see that in the event of a request failure, we will set the error object to an error message and bind it to view.

In general, network request is a very important technology. Uniapp and Vue.js can easily implement the rendering of data after network request. I hope the above introduction will be helpful to you.

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