vue-nested-draggable

This is a nested draggable component. This component does not have css, you need to add your style refer to demo. The demo style is less, not difficult. This component doesn't render node. It exposes a node rendering slot. Please refer to the demo for rendering.

Full examples

Touch

Support touch(single point).

Indexes

• Installation
• Usage
  • Global
  • Local
  • Data
  • Template
• Configuration
  • Props
  • Hooks
  • Tree properties
  • draggableHelperInfo: {event, options, store}
  • Events
  • Methods
  • node properties
  • node deep properties example
• Other
  • Demo css
• Development
• License

Installation

npm install @jambonn/vue-nested-draggable

or if you prefer yarn

yarn add @jambonn/vue-nested-draggable

Usage

Global

You may install Vue Nested Draggable globally:

import Vue from 'vue';
import VueNestedDraggable from '@jambonn/vue-nested-draggable';

Vue.component('draggable-tree', VueNestedDraggable.DraggableTree);

This will make <draggable-tree> available to all components within your Vue app.

Local

Include the carousel directly into your component using import:

import { DraggableTree } from '@jambonn/vue-nested-draggable';

export default {
  ...
  components: {
    DraggableTree
  }
  ...
};

Data

data: [
  {text: 'node 1'},
  {text: 'node 2'},
  {text: 'node 3 undraggable', draggable: false},
  {text: 'node 4'},
  {text: 'node 4 undroppable', droppable: false},
  {text: 'node 5', children: [
    {text: 'node 1'},
    {text: 'node 2', children: [
      {text: 'node 3'},
      {text: 'node 4'},
    ]},
    {text: 'node 2 undroppable', droppable: false, children: [
      {text: 'node 3'},
      {text: 'node 4'},
    ]},
    {text: 'node 2', children: [
      {text: 'node 3'},
      {text: 'node 4 undroppable', droppable: false},
    ]},
    {text: 'node 3'},
    {text: 'node 4'},
    {text: 'node 3'},
    {text: 'node 4'},
    {text: 'node 3'},
    {text: 'node 4'},
    {text: 'node 3'},
    {text: 'node 4'},
  ]},
]

Template

<draggable-tree :data="data" draggable="draggable" crosstree="crossTree">
    <div slot-scope="{data, store, vm}">
        <template v-if="!data.isDragPlaceHolder">
            <b v-if="data.children &amp;&amp; data.children.length" @click="store.toggleOpen(data)">
                {{data.open ? &apos;-&apos; : &apos;+&apos;}}&nbsp;
            </b>
            <span>{{data.text}}</span>
        </template>
    </div>
</tree>

Configuration

Props

// base tree
data: {}, // type Array
indent: {default: 16},
activatedClass: {default: 'active'},
openedClass: {default: 'open'}
space: {default: 10}, // space between node, unit px
// draggable tree
preventSelect: {default: true}, // if to prevent drag handler text be selected when drag, excluding input and textarea
getTriggerEl: {type: Function}, // get the el trigger drag, default is node self. arguments(nodeVm)
draggable: {}, // is the tree draggable, default false
droppable: {default: true}, // is the tree droppable, default true
crossTree: {}, // can a node of the tree be dragged into other tree, or receive other tree node

Hooks

ondragstart: {type: Function}, // hook. return false to prevent drag. arguments(node, draggableHelperInfo)
ondragend: {type: Function}, // hook. return false to prevent drop. arguments(node, draggableHelperInfo)

draggableHelperInfo

{event, options, store}

Properties

// base
rootData, // generated by tree
// draggable
dplh, // drag placeholder. globally unique.
trees, // array, all trees in the app. globally unique.

Events

// store is the tree vm
drag(node), // on drag start.
drop(node, targetTree, oldTree), // after drop.
change(node, targetTree, oldTree), // after drop, only when the node position changed
nodeOpenChanged(node) // on a node is closed or open

Methods

pure(node, withChildren, after)
/*
pure
return a node data without runtime properties.(!: property which starts with '_' will be removed)
withChildren: optional. after: Function, optional
the code about after(t is computed node data):
if (after) {
  return after(t, node) || t
}
return t
*/
getNodeById(id)
getActivated()
getOpened()
activeNode(node, inactiveOld)
toggleActive(node, inactiveOld)
openNode(node, closeOld)
toggleOpen(node, closeOld)
// follow methods are easy, so I paste their soure code
getPureData(after) { return this.pure(this.rootData, true, after).children } // after: Function, optional
deleteNode(node) { return hp.arrayRemove(node.parent.children, node) }
// add node: like array. eg: node.children.push(newNodeData)
// update node: just assign to the node properties directly
isNodeDraggable(node)
isNodeDroppable(node)

Node properties

// base
_id
_vm
parent
children: [],
open,
active: false,
style: {},
class: '',
innerStyle: {},
innerClass: '',
innerBackStyle: {},
innerBackClass: {},
// draggable
draggable // default true. Please check 'draggable & droppable' below
droppable // default true. Please check 'draggable & droppable' below
isDragPlaceHolder

Node deep properties example

node._vm // vm
node._vm.level // 节点层级, 只读
node._vm.store // tree
node.parent._vm // parent node vm
node._vm.store

Node max level

<draggable-tree :data="data" draggable="draggable" crosstree="crossTree" @drag="ondrag">
    <div slot-scope="{data, store, vm}">
        <template v-if="!data.isDragPlaceHolder">
            <b v-if="data.children &amp;&amp; data.children.length" @click="store.toggleOpen(data)">
                {{data.open ? &apos;-&apos; : &apos;+&apos;}}&nbsp;
            </b>
            <span>{{data.text}}</span>
        </template>
    </div>
</tree>

import { DraggableTree, depthFirstSearch } from '@jambonn/vue-nested-draggable';

export default {
  ...
    components: {
        DraggableTree
    },
    methods: {
        ondrag(node) {
          const maxLevel = 2
          let nodeLevels = 1
          depthFirstSearch(node, childNode => {
            if (childNode._vm.level > nodeLevels) {
              nodeLevels = childNode._vm.level
            }
          })
          nodeLevels = nodeLevels - node._vm.level + 1
          const childNodeMaxLevel = maxLevel - nodeLevels
          depthFirstSearch(this.originalData, childNode => {
            if (childNode === node) {
              return 'skip children'
            }
            if (!childNode._vm) {
              console.log(childNode)
            }
            this.$set(
              childNode,
              'droppable',
              childNode._vm.level <= childNodeMaxLevel,
            )
          })
        },
    },
  ...
};

Other

Demo css

.he-tree{
  border: 1px solid #ccc;
  padding: 20px;
  width: 300px;
}
.tree-node-inner{
  padding: 5px;
  border: 1px solid #ccc;
  cursor: pointer;
}
.draggable-placeholder-inner{
  border: 1px dashed #0088F8;
  box-sizing: border-box;
  background: rgba(0, 136, 249, 0.09);
  color: #0088f9;
  text-align: center;
  padding: 0;
  display: flex;
  align-items: center;
}

Project setup

yarn install

Compiles and hot-reloads for development

yarn serve

Compiles and minifies for production

yarn build

Lints and fixes files

yarn lint

License

This project is licensed under the MIT License - see the LICENSE.md file for details.