How to contact the backend in vue

Vue is a JavaScript framework for building user interfaces. It has many advantages, such as being easy to learn, customizable, making it easy to create complex single-page applications, and more. Vue usually looks at the problem from the perspective of front-end construction, but it needs to be integrated with the back-end in many projects to communicate with back-end applications such as databases and servers. This article will introduce how to use Vue to interact with the backend.

1. Backend settings

Before starting, make sure the backend application can receive requests from Vue. This usually requires setting up API endpoints to send requests to Vue and receive responses. In your backend code, you need to define routes for all requests sent by your Vue application. Routing is responsible for determining which function in the application will respond to Vue requests.

Add the following code to the routing file:

app.get('/getdata', function(req, res) {

res.send（sampledata）;

});

The above code defines the routing of the application so that when the "/getdata" endpoint is GET in the browser, the response defined in the code is returned.

2. Sending a request from a Vue application

The main method for Vue to request backend data is to use the Vue Resource plug-in. Vue Resource is an HTTP library that provides a service in Vue that can be used to send HTTP requests.

Add the following code to the Vue component:

import Vue from 'vue'
import VueResource from 'vue-resource'

Vue.use(VueResource);

export default {

name: 'my-component',
data () {
  return {
    results: {}
  }
},
created () {
    this.$http.get('/getdata')
        .then(response => {
            this.results = response.body;
        }, response => {
            console.log('Error fetching data');  
        });
    }

}

In the above code, when the component is created, it will call Vue's $http service to send a GET request to the server, and will The response is returned to the component. If the request returns data successfully, the component's template is rendered using the data.

3. Processing the backend response

When Vue Resource receives the response, it will return a Promise object. This object can be used to check whether the response was successful and, if so, use the data from the response.

In the above code, if the response is successful, the data in the response body is stored in the results object in the component. This object is then used to render Vue templates. If the request fails, an error message is printed.

This is the basic method of how to interact with the backend using Vue. To use more advanced functions, such as sending requests using POST, PUT, and DELETE methods, sending and processing form data, etc., you can view the Vue Resource documentation.

Summary

Vue is an important technology for modern web applications. The Vue Resource plugin is the main tool for interacting with the backend. When building Vue applications, integrating Vue Resources into your application is a must. Make sure your server is set up to receive Vue requests and send responses back to your application. By looking at the Vue Resource documentation, you can learn how Vue uses more features to interact with the backend.

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