How to use Vue and Axios to implement CRUD operations on data
In front-end development, it is often necessary to interact with the back-end server to perform data addition, deletion, modification, and query (CRUD) operations. Vue is a popular JavaScript framework that helps us build interactive user interfaces. Axios is a Promise-based HTTP library that can help us easily communicate data with the server. By combining Vue and Axios, we can easily implement CRUD operations on data.
In this article, we will take a simple task management system as an example to demonstrate how to use Vue and Axios for CRUD operations.
- Create Vue instance
First, we need to create a Vue instance for data binding and operations. You can introduce Vue in an HTML file and create a Vue instance in JavaScript:
<!-- index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>CRUD Example</title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
<div id="app">
<!-- 页面内容 -->
</div>
<script src="app.js"></script>
</body>
</html>// app.js
var app = new Vue({
el: '#app',
data: {
tasks: []
},
methods: {
// CRUD方法
},
mounted: function() {
// 获取任务列表
}
}); In the above code, we create a Vue instance and define an empty object named tasks Array, used to store task lists. At the same time, we also defined some methods for CRUD operations.
- Get the task list
In Vue's mounted life cycle hook, we can use Axios to send a GET request to get the task list, and Assign the returned data to tasks:
// app.js
mounted: function() {
var vm = this;
axios.get('/api/tasks')
.then(function(response) {
vm.tasks = response.data;
})
.catch(function(err) {
console.error(err);
});
}In the above code, we use the get method of Axios to send a GET request to /api/tasks Interface, and then assign the returned data to tasks in the then callback function.
- Add a task
When adding a task, we need to send a POST request to the server and pass the data of the new task. You can define a addTask method in the Vue instance to handle this request:
// app.js
methods: {
addTask: function() {
var vm = this;
axios.post('/api/tasks', { title: 'New Task' })
.then(function(response) {
vm.tasks.push(response.data);
})
.catch(function(err) {
console.error(err);
});
}
}In the above code, we use the post method of Axios to send a POST request to /api/tasksinterface, and pass { title: 'New Task' } as the request body. In the then callback function, we append the new task data returned by the server to the tasks array.
- Update task
When updating a task, we need to send a PUT request to the server and pass the updated task data. You can define an updateTask method in the Vue instance to handle this request:
// app.js
methods: {
updateTask: function(task) {
var vm = this;
axios.put('/api/tasks/' + task.id, { title: task.title })
.then(function(response) {
// 更新成功
})
.catch(function(err) {
console.error(err);
});
}
}In the above code, we use the put method of Axios to send a PUT request to /api/tasks/:id interface, and pass the task ID and updated title as request parameters. In the then callback function, we can perform some operations after the update is successful.
- Delete tasks
When deleting a task, we need to send a DELETE request to the server and specify the ID of the task to be deleted. You can define a deleteTask method in the Vue instance to handle this request:
// app.js
methods: {
deleteTask: function(task) {
var vm = this;
axios.delete('/api/tasks/' + task.id)
.then(function(response) {
vm.tasks = vm.tasks.filter(function(t) {
return t.id !== task.id;
});
})
.catch(function(err) {
console.error(err);
});
}
}In the above code, we use the delete method of Axios to send a DELETE request to /api/tasks/:idInterface, and specify the ID of the task to be deleted. In the then callback function, we can use the filter method to filter out the tasks array that does not contain deleted tasks.
Through the above code examples, we can see how to use Vue and Axios to implement CRUD operations on data. Of course, in actual projects, we also need to carry out some expansion and optimization according to specific needs. I hope this article can help you better understand and apply Vue and Axios.
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