How to pass data to server using UniApp

UniApp is a framework for developing cross-platform applications. It can be used to quickly develop applications that work on different platforms at the same time. In applications, we often need to transfer data to the server. Here we introduce how to use UniApp to transfer data to the server.

1. UniApp sends a network request

UniApp provides an API uni.request() for initiating network requests to the remote server. This function needs to pass an object as a parameter, which contains the requested URL, request method, request header, request body and other information. The following is a basic example:

uni.request({
  url: 'https://www.example.com/api',
  method: 'POST',
  header: {
    'content-type': 'application/x-www-form-urlencoded'
  },
  data: {
    name: 'John',
    age: 30
  },
  success: function (res) {
    console.log(res.data)
  }
})

In the above code, a uni.request() function is first defined, and then this function is used to send to "https://www.example.com/api" Made a POST request. At the same time, an object containing the request header and request body is also passed. Among them, the content-type attribute of the request header specifies the type of the request body as application/x-www-form-urlencoded, and the key-value pair in the data attribute is the data that needs to be passed to the server.

2. Use Vue instances for data binding

In addition to the traditional methods, we can also transfer data more easily, such as using Vue instances for data binding. In the Vue instance, we can define a data attribute to store the data that needs to be passed to the server. In the Vue template, we can use {{data}} to reference the data. For example:

<template>
  <div>
    <input type="text" v-model="data.username">
    <input type="password" v-model="data.password">
    <button @click="onSubmit">Submit</button>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        data: {
          username: '',
          password: ''
        }
      }
    },
    methods: {
      onSubmit() {
        uni.request({
          url: 'https://www.example.com/api',
          method: 'POST',
          header: {
            'content-type': 'application/x-www-form-urlencoded'
          },
          data: this.data,
          success: function (res) {
            console.log(res.data)
          }
        })
      }
    }
  }
</script>

In the above example, we defined a template containing two input boxes and a button, and used the v-model directive to bind the input value in the component to the data attribute. When the user clicks the submit button, the onSubmit() method will be triggered, launching a POST request to the server and bringing the data in the vue instance.

3. Conclusion

At this point, we have a general understanding of how to transfer data to the server in UniApp. In different development scenarios, we will use different data transfer methods. Hope this article can be helpful to you.

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