How to implement drag-and-drop sorting and drag-and-drop operations in uniapp

Uniapp is a cross-platform development framework. Its powerful cross-end capabilities allow developers to develop various applications quickly and easily. It is also very simple to implement drag-and-drop sorting and drag-and-drop operations in Uniapp, and it can support drag-and-drop operations of a variety of components and elements. This article will introduce how to use Uniapp to implement drag-and-drop sorting and drag-and-drop operations, and provide specific code examples.

The drag-and-drop sorting function is very common in many applications. For example, it can be used to implement drag-and-drop sorting of lists, drag-and-drop sorting of icons, etc. Let's take the drag-and-drop sorting of a list as an example to introduce how to implement it.

First, we need to define a draggable list component in the template of the page, for example:

<template>
  <view>
    <view v-for="(item, index) in list" :key="item.id" draggable="true" @dragstart="handleDragStart(index)">
      {{ item.name }}
    </view>
  </view>
</template>

Define list data in data to store the list data, for example:

data() {
  return {
    list: [
      { id: 1, name: '列表项1' },
      { id: 2, name: '列表项2' },
      { id: 3, name: '列表项3' },
      { id: 4, name: '列表项4' },
    ]
  }
},

Then define the handleDragStart method in methods to handle the drag start event, for example:

methods: {
  handleDragStart(index) {
    // 设置拖拽数据
    event.dataTransfer.setData("index", index);
  }
},

Next, we also need to add dragover and drop events for each list item, for Handle operations during dragging. For example:

<template>
  <view>
    <view v-for="(item, index) in list" :key="item.id" draggable="true" @dragstart="handleDragStart(index)" @dragover="handleDragOver" @drop="handleDrop(index)">
      {{ item.name }}
    </view>
  </view>
</template>

Define the handleDragOver method and handleDrop method in methods, which are used to handle the element position transformation during the dragging process and the data processing after the dragging is completed. For example:

methods: {
  handleDragOver(event) {
    event.preventDefault();
  },

  handleDrop(targetIndex) {
    const sourceIndex = event.dataTransfer.getData("index");
    // 交换列表项的位置
    const temp = this.list[sourceIndex];
    this.list[sourceIndex] = this.list[targetIndex];
    this.list[targetIndex] = temp;
  }
},

Through the above code, we have implemented a simple list drag and drop sorting function. When the user drags a list item, the handleDragStart event is triggered and its index information is stored in the drag data. During the dragging process, the default event is prevented from occurring through the handleDragOver event, and then the index information is used to exchange the position of the list item in the handleDrop event, thereby realizing drag and drop sorting.

In addition to drag and drop sorting, Uniapp also supports drag and drop operations with other functions, such as dragging elements to designated areas, dragging and dropping files to upload, etc. Developers can flexibly apply drag-and-drop operations based on specific needs by combining the APIs and components provided by Uniapp.

In short, through Uniapp’s cross-platform capabilities, we can easily implement various drag-and-drop operations, and the code is concise and clear. I hope the introduction in this article will be helpful to you. If you have any other questions, please feel free to continue the discussion.

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