npm package: @mrodrig/vuedraggable
Description: draggable component for vue
Author: David Desmaisons
Latest version: 2.19.0

<p align="center"><img width="140"src="https://raw.githubusercontent.com/SortableJS/Vue.Draggable/master/logo.png"></p>
<h1 align="center">Vue.Draggable</h1>

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Vue component (Vue.js 2.0) or directive (Vue.js 1.0) allowing drag-and-drop and synchronization with view model array.

Based on and offering all features of [Sortable.js](https://github.com/RubaXa/Sortable)

## Demo

![demo gif](https://raw.githubusercontent.com/SortableJS/Vue.Draggable/master/example.gif)

## Live Demo

https://david-desmaisons.github.io/draggable-example/

## Features

* Full support of [Sortable.js](https://github.com/RubaXa/Sortable) features:
    * Supports touch devices
    * Supports drag handles and selectable text
    * Smart auto-scrolling
    * Support drag and drop between different lists
    * No jQuery dependency
* Keeps in sync HTML and view model list
* Compatible with Vue.js 2.0 transition-group
* Cancellation support
* Events reporting any changes when full control is needed
* Reuse existing UI library components (such as [vuetify](https://vuetifyjs.com), [element](http://element.eleme.io/), or [vue material](https://vuematerial.io) etc...) and make them draggable using `element` and `componentData` props

## Backers

 <a href="https://flatlogic.com/admin-dashboards">
 <img width="190" style="margin-top: 10px;" src="https://flatlogic.com/assets/logo-d9e7751df5fddd11c911945a75b56bf72bcfe809a7f6dca0e32d7b407eacedae.svg">
 </a>

Admin Dashboard Templates made with Vue, React and Angular.

## Installation

### With npm or yarn 

```bash
yarn add vuedraggable

npm i -S vuedraggable
```

**Beware it is vuedraggable for Vue 2.0 and not vue-draggable which is for version 1.0**

### with direct link 
```html

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.5.2/vue.min.js"></script>
<!-- CDNJS :: Sortable (https://cdnjs.com/) -->
<script src="//cdn.jsdelivr.net/npm/sortablejs@1.7.0/Sortable.min.js"></script>
<!-- CDNJS :: Vue.Draggable (https://cdnjs.com/) -->
<script src="//cdnjs.cloudflare.com/ajax/libs/Vue.Draggable/2.17.0/vuedraggable.min.js"></script>

```

[cf example section](https://github.com/SortableJS/Vue.Draggable/tree/master/examples)

## For Vue.js 2.0

Use draggable component:

### Typical use:
``` html
<draggable v-model="myArray" :options="{group:'people'}" @start="drag=true" @end="drag=false">
   <div v-for="element in myArray" :key="element.id">{{element.name}}</div>
</draggable>
```
.vue file:
``` js
  import draggable from 'vuedraggable'
  ...
  export default {
        components: {
            draggable,
        },
  ...
```

### With `transition-group`:
``` html
<draggable v-model="myArray">
    <transition-group>
        <div v-for="element in myArray" :key="element.id">
            {{element.name}}
        </div>
    </transition-group>
</draggable>
```

Draggable component should directly wrap the draggable elements, or a `transition-component` containing the draggable elements.


### With footer slot:
``` html
<draggable v-model="myArray" :options="{draggable:'.item'}">
    <div v-for="element in myArray" :key="element.id" class="item">
        {{element.name}}
    </div>
    <button slot="footer" @click="addPeople">Add</button>
</draggable>
```
### With header slot:
``` html
<draggable v-model="myArray" :options="{draggable:'.item'}">
    <div v-for="element in myArray" :key="element.id" class="item">
        {{element.name}}
    </div>
    <button slot="header" @click="addPeople">Add</button>
</draggable>
```

### With Vuex:

```html
<draggable v-model='myList'>
``` 

```javascript
computed: {
    myList: {
        get() {
            return this.$store.state.myList
        },
        set(value) {
            this.$store.commit('updateList', value)
        }
    }
}
```


### Props
#### value
Type: `Array`<br>
Required: `false`<br>
Default: `null`

Input array to draggable component. Typically same array as referenced by inner element v-for directive.<br>
This is the preferred way to use Vue.draggable as it is compatible with Vuex.<br>
It should not be used directly but only though the `v-model` directive:
```html
<draggable v-model="myArray">
```

#### list
Type: `Array`<br>
Required: `false`<br>
Default: `null`

Alternative to the `value` prop, list is an array to be synchronized with drag-and-drop.<br>
The main difference is that `list` prop is updated by draggable component using splice method, whereas `value` is immutable.<br>
**Do not use in conjunction with value prop.**

#### options
Type: `Object`<br>
Required: `false`

Option used to initialize the sortable object see: [sortable option documentation](https://github.com/RubaXa/Sortable#options)<br>
Note that all the method starting by "on" will be ignored as draggable component expose the same API via events.

As an example, a drag handle can be added using this binding `:options="{handle:'.handle'}"`. Read the linked documentation for other options available to you.

#### element
Type: `String`<br>
Default: `'div'`

HTML node type of the element that draggable component create as outer element for the included slot.<br>
It is also possible to pass the name of vue component as element. In this case, draggable attribute will be passed to the create component.<br>
See also [componentData](#componentdata) if you need to set props or event to the created component.

#### clone
Type: `Function`<br>
Required: `false`<br>
Default: `(original) => { return original;}`<br>

Function called on the source component to clone element when clone option is true. The unique argument is the viewModel element to be cloned and the returned value is its cloned version.<br>
By default vue.draggable reuses the viewModel element, so you have to use this hook if you want to clone or deep clone it.

#### move
Type: `Function`<br>
Required: `false`<br>
Default: `null`<br>

If not null this function will be called in a similar way as [Sortable onMove callback](https://github.com/RubaXa/Sortable#move-event-object).
Returning false will cancel the drag operation.

```javascript
function onMoveCallback(evt, originalEvent){
   ...
    // return false; — for cancel
}
```
evt object has same property as [Sortable onMove event](https://github.com/RubaXa/Sortable#move-event-object), and 3 additional properties:
 - `draggedContext`:  context linked to dragged element
   - `index`: dragged element index
   - `element`: dragged element underlying view model element
   - `futureIndex`:  potential index of the dragged element if the drop operation is accepted
 - `relatedContext`: context linked to current drag operation
   - `index`: target element index
   - `element`: target element view model element
   - `list`: target list
   - `component`: target VueComponent

HTML:
```HTML
<draggable :list="list" :move="checkMove">
```
javascript:
```javascript
checkMove: function(evt){
    return (evt.draggedContext.element.name!=='apple');
}
```
See complete example: [Cancel.html](https://github.com/SortableJS/Vue.Draggable/blob/master/examples/Cancel.html), [cancel.js](https://github.com/SortableJS/Vue.Draggable/blob/master/examples/script/cancel.js)

#### componentData
Type: `Object`<br>
Required: `false`<br>
Default: `null`<br>

This props is used to pass additional information to child component declared by [element props](#element).<br>
Value:
* `props`: props to be passed to the child component
* `on`: events to be subscribe in the child component

Example (using [element UI library](http://element.eleme.io/#/en-US)):
```HTML
<draggable element="el-collapse" :list="list" :component-data="getComponentData()">
    <el-collapse-item v-for="e in list" :title="e.title" :name="e.name" :key="e.name">
        <div>{{e.description}}</div>
     </el-collapse-item>
</draggable>
```
```javascript
methods: {
    handleChange() {
      console.log('changed');
    },
    inputChanged(value) {
      this.activeNames = value;
    },
    getComponentData() {
      return {
        on: {
          change: this.handleChange,
          input: this.inputChanged
        },
        props: {
          value: this.activeNames
        }
      };
    }
  }
```

### Events

* Support for Sortable events:

  `start`, `add`, `remove`, `update`, `end`, `choose`, `sort`, `filter`, `clone`<br>
  Events are called whenever onStart, onAdd, onRemove, onUpdate, onEnd, onChoose, onSort, onClone are fired by Sortable.js with the same argument.<br>
  [See here for reference](https://github.com/RubaXa/Sortable#event-object-demo)

  Note that SortableJS OnMove callback is mapped with the [move prop](https://github.com/SortableJS/Vue.Draggable/blob/master/README.md#move)

HTML:
```HTML
<draggable :list="list" @end="onEnd">
```

* change event

  `change` event is triggered when list prop is not null and the corresponding array is altered due to drag-and-drop operation.<br>
  This event is called with one argument containing one of the following properties:
  - `added`:  contains information of an element added to the array
    - `newIndex`: the index of the added element
    - `element`: the added element
  - `removed`:  contains information of an element removed from to the array
    - `oldIndex`: the index of the element before remove
    - `element`: the removed element
  - `moved`:  contains information of an element moved within the array
    - `newIndex`: the current index of the moved element
    - `oldIndex`: the old index of the moved element
    - `element`: the moved element

### Slots

Limitation: neither header or footer slot works in conjunction with transition-group.

#### Header
Use the `header` slot to add none-draggable element inside the vuedraggable component.
Important: it should be used in conjunction with draggable option to tag draggable element.
Note that header slot will always be added before the default slot regardless its position in the template.
Ex:

``` html
<draggable v-model="myArray" :options="{draggable:'.item'}">
    <div v-for="element in myArray" :key="element.id" class="item">
        {{element.name}}
    </div>
    <button slot="header" @click="addPeople">Add</button>
</draggable>
```

#### Footer
Use the `footer` slot to add none-draggable element inside the vuedraggable component.
Important: it should be used in conjunction with draggable option to tag draggable element.
Note that footer slot will always be added after the default slot regardless its position in the template.
Ex:

``` html
<draggable v-model="myArray" :options="{draggable:'.item'}">
    <div v-for="element in myArray" :key="element.id" class="item">
        {{element.name}}
    </div>
    <button slot="footer" @click="addPeople">Add</button>
</draggable>
```

### Gotchas
  - Drag operation with empty list:

    To be able to drag items on an empty draggable component, set a min-height greater than 0 on the `draggable` component or the `transition-group` if any and ensure the transition group has display: block; otherwise height won't work.

### Fiddle

- Simple:
https://jsfiddle.net/dede89/sqssmhtz/

- Two Lists:
https://jsfiddle.net/dede89/32ao2rpm/

- Example with list clone:
https://jsfiddle.net/dede89/t3m5krea/

- Example with transition-group:
https://jsfiddle.net/dede89/m2v0orcn/

- Example with table:
https://jsfiddle.net/dede89/L54yu3L9/

- Example with remove button
 on list elements
 https://jsfiddle.net/dede89/5Leuhh1n/
 
 ### Full demo example

[draggable-example](https://github.com/David-Desmaisons/draggable-example)

## For Vue.js 1.0

[See here](documentation/Vue.draggable.for.ReadME.md)

```