How does uniapp interact with the background?

With the continuous development of mobile Internet, the development of mobile applications is also becoming increasingly popular. As a developer, if you want to quickly develop high-quality mobile applications, you need to use some simple and fast development tools. This article will introduce uniapp, a cross-platform mobile application development framework, and detail how uniapp interacts with the backend.

1. Introduction to uniapp

Uniapp is a cross-platform framework developed based on vue.js. Developers only need to use the syntax and API of vue.js to complete multiple terminals (including Development of iOS, Android, H5, etc.). uniapp not only provides a variety of commonly used UI components, APIs and plug-ins, but also supports IDE development tools such as HBuilderX, providing developers with a better development experience and convenient development methods.

2. Background interaction process

In mobile application development, data interaction with the background is an essential link. The general process is that the application sends a request to the background, and the background processes the request and returns the data to the application. In uniapp, background interaction can be divided into the following steps:

1. Send a request

In uniapp, you can use the uni.request function to send a request. The parameters of this function include url (request address), method (request method), data (data sent to the server), header (request header), etc. For details, please refer to the instructions in the uniapp official documentation.

2. Background processing request

After receiving the request in the background, the request needs to be processed according to the interface document. Generally speaking, it is necessary to verify the request parameters, retrieve the database and return the query results, etc.

3. Return data

The background returns corresponding data based on the requested parameters and specific business logic. Generally speaking, data in JSON format can be returned to the application. The application can parse the returned data and then render it on the page.

4. Processing the returned data

The application needs to parse the data returned from the background. You can use the JSON.parse function provided by uniapp to convert strings into JSON format data. The parsed data can be rendered and displayed as needed.

3. Background interaction implementation

In actual development, in order to facilitate operation, the relevant code for background interaction is generally written in a separate file. Here we take obtaining product list data as an example to introduce how uniapp interacts with the background.

1. Calling data in the page

In the onLoad function of the page, call the uni.request function to send the request to the background and request to obtain the product list data. As shown below:

onLoad: function() {
  var _this = this;
  uni.request({
    url: 'http://www.xxxx.com/api/getGoodsList',
    method: 'post',
    success: function(res) {
      _this.goodsList = res.data;
    }
  });
}

2. Background processing request

The background needs to process the request according to the interface document. Here, we can write a simple PHP script to query product list data. As shown below:

<?php
header("Access-Control-Allow-Origin: *");
header("Content-Type: text/json; charset=utf-8");

$data = array(
  array(&#39;id&#39; => 1, 'name' => '商品1', 'price' => 100),
  array('id' => 2, 'name' => '商品2', 'price' => 200),
  array('id' => 3, 'name' => '商品3', 'price' => 300),
);

echo json_encode($data);
?>

3. Return data

After processing the request in the background, the data that needs to be returned is encoded in JSON format and returned to the application through the echo statement . After the application receives the data returned from the background, it will execute the code in the success function, parse the returned JSON data into an array, and assign the value of the array to the goodsList variable. The goodsList variable can be used for page rendering.

4. Summary

Through the above steps, we can realize data interaction with the background in uniapp. uniapp makes it easier and faster for us to develop mobile applications by providing a simple and easy-to-use API. At the same time, we also need to write corresponding code in the background to interact with the application. In actual development, it is necessary to comprehensively consider many factors and make corresponding adjustments and modifications according to specific needs in order to finally present a perfect mobile application.

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