Vue.Draggable：如何“将项目拖到另一个项目上”而不是添加/删除 [英] Vue.Draggable: How to "drag an item onto another item" instead of adding/removing

问题描述

使用 https://github.com/SortableJS/Vue.Draggable

我有一个关于如何实现将文件拖入文件夹的经典示例的问题。
我看到 @change 事件获取有关被拖动项目的数据，但没有关于被拖动项目的数据。
关于如何实现这个目标的任何想法？

I have a question on how to achieve the classic example of dragging a file into a folder. I see the @change event gets data about the dragged item, but not about the item that its being dragged onto. Any ideas on how to achieve this?

以下是一个或多或少看起来的例子，但显然我希望能够重新分配 file.folder_name 里面的 onFoldersChange - 不知何故。
https://jsfiddle.net/u5nb48cs/2/

Here's an example of what it would look like more or less, but obviously I would like to be able to reassign the file.folder_name inside that onFoldersChange - somehow. https://jsfiddle.net/u5nb48cs/2/

谢谢！

推荐答案

如果你想让文件夹包含文件，每个文件夹需要能够保存文件并成为可拖动的目的地。

If you want the folders to contain files, each folder needs to be able to hold files and be a draggable destination.

var vm = new Vue({
  el: "#main",
  data: {
    folders: [{
      name: "Folder1",
      contents: []
    }, {
      name: "Folder2",
      contents: []
    }, {
      name: "Folder3",
      contents: []
    }],
    files: [{
      name: "foo",
      folder_name: "Folder1"
    }, {
      name: "bar",
      folder_name: 'Folder2'
    }]
  },
  methods: {
    onFoldersChange() {
      console.log(arguments);
    }
  }
});

.dragArea {
  min-height: 10px;
}

<script src="//cdn.jsdelivr.net/sortable/1.4.2/Sortable.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.4.2/vue.min.js"></script>
<script src="//cdn.rawgit.com/David-Desmaisons/Vue.Draggable/master/dist/vuedraggable.min.js"></script>
<div id="main">
  <h1>Vue Draggable</h1>
  <div class="drag">
    <h2>Folders</h2>
    <div v-for="(element, index) in folders" :key="index">{{element.name}}
      <draggable v-model="element.contents" class="dragArea" :options="{group:{ put:'files'}}" @change="onFoldersChange">
        <div v-for="item in element.contents">
          {{item.name}}
        </div>
      </draggable>
    </div>

    <h2>Files</h2>
    <draggable v-model="files" class="dragArea" :options="{group:{ name:'files'}}">
      <div v-for="(element, index) in files" :key="index">{{element.name}}</div>
    </draggable>
  </div>

</div>

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