How to implement draggable components in Vue documentation

Vue is a very popular open source JavaScript framework that provides a wealth of components and tools to simplify front-end development. One particularly useful component is the draggable component. This article will introduce the implementation of draggable components in Vue documents.

Vue provides a plug-in called draggable to implement dragging features. This plug-in can add draggable features to any element in Vue, and supports advanced features such as optional sorting and limiting the movement range when dragging.

In this article, we will use Vue-cli and npm to create and manage projects. Vue-cli is an officially provided Vue scaffolding tool that can quickly create Vue-based applications.

First, execute the following command in the command line to install Vue-cli:

npm install -g vue-cli

Next, we will Create a new Vue project using Vue-cli:

vue init webpack drag-and-drop

This command will use webpack as the build tool and create a project named New Vue project for drag-and-drop. During this period, you can choose whether to install other extensions such as vue-router and ESLint.

After the installation is complete, you can use the following command to enter the directory where the project is located:

cd drag-and-drop

Next, we need to install draggable Plugin:

npm install vuedraggable

This will install the latest version of the draggable plugin.

Now, we can use draggable plugins in Vue components. To demonstrate how to use draggable components, we will create a simple application that contains a to-do list. Users can reorder the task list by dragging tasks.

Open the src/components/TodoList.vue file and add the following code:

<template>
  <div>
    <h2>待办事项列表</h2>
    <draggable v-model="tasks">
      <div v-for="(task,index) in tasks" :key="index">
        <input type="checkbox" v-model="task.completed">
        <span>{{ task.title }}</span>
      </div>
    </draggable>
    <button @click="addTask()">添加任务</button>
  </div>
</template>

<script>
import draggable from 'vuedraggable';

export default {
  name: 'TodoList',
  components: {
    draggable,
  },
  data() {
    return {
      tasks: [
        { title: '完成Vue项目', completed: false },
        { title: '阅读Vue文档', completed: true },
        { title: '学习JavaScript', completed: false },
      ],
    };
  },
  methods: {
    addTask() {
      this.tasks.push({
        title: '新增任务',
        completed: false,
      });
    },
  },
};
</script>

This component defines a card that contains our task list. We use draggable components to make each task draggable.

In this example, we use the v-model directive to bind the task array. This means that we can rearrange this array by dragging tasks, thereby changing the order of the tasks.

We can also see an "Add Task" button. Clicking this button will add a new task to the task array.

We also use the computed attribute to calculate the number of unfinished tasks.

Finally, we need to add the TodoList component to our application.

Open the src/App.vue file and add the following code:

<template>
  <div id="app">
    <TodoList />
  </div>
</template>

<script>
import TodoList from '@/components/TodoList';

export default {
  name: 'App',
  components: {
    TodoList,
  }
};
</script>

This component defines our application and adds the TodoList component to the page.

Congratulations, you have successfully created a to-do list that can be sorted by drag-and-drop with Vue.

Vue-cli and draggable plugins are powerful tools for building powerful Vue applications. However, it should be noted that this article only provides a basic example. If you want to use Vue's drag and drop feature in actual applications, you will need to apply and modify it to meet your needs.

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