sl-vue-tree

Customizable draggable tree component for Vue.js

install

npm i sl-vue-tree

Quick start

<div id="app">
  <sl-vue-tree v-model="nodes"/>
</div>

<link rel="stylesheet" href="dist/sl-vue-tree-dark.css">
<script src="dist/sl-vue-tree.js"></script>

<script>

    var nodes = [
    {title: 'Item1', isLeaf: true},
    {title: 'Item2', isLeaf: true, data: { visible: false }},
    {title: 'Folder1'},
    {
      title: 'Folder2', isExpanded: true, children: [
        {title: 'Item3', isLeaf: true},
        {title: 'Item4', isLeaf: true}
      ]
    }
  ];

  new Vue({
    el: '#app',
    components: { SlVueTree },
    data: function () {
     return {
       nodes: nodes
     }
    }
  });
  
</script>    

The value property is array of ISlTreeNodeModel nodes:

interface ISlTreeNodeModel<TDataType> {
    title: string;
    isLeaf?: boolean;
    children?: ISlTreeNodeModel<TDataType>[];
    isExpanded?: boolean;
    isSelected?: boolean;
    data?: TDataType; // any serializable user data
}

For convenience the component's events returns ISlTreeNode objects those actually are ISlTreeNodeModel
with some computed props:

interface ISlTreeNode<TDataType> extends ISlTreeNodeModel<TDataType> {
    isFirstChild: boolean;
    isLastChild: boolean;
    isVisible: boolean;	// node is visible if the all of it's parents are expanded
    level: number; // nesting level
    ind: number; // index in the array of siblings 
    path: number[]; // path to node as array of indexes, for exaple [2, 0, 1] in example above is path to `Item4` 
    pathStr: string; // serialized path to node
    children: ISlTreeNode<TDataType>[];
}

You can get the list of ISlTreeNode from the computed slVueTree.nodes property

Props

prop	type	default	description
value	ISlTreeNodeModel[]	[]	An array of nodes to show. Each node represented by ISlTreeNodeModel interface
allowMultiselect	Boolean	true	Disable or enable the multiselect feature
edgeSize	Number	3	Offset in pixels from top and bottom for folder-node element. While dragging cursor is in that offset, the dragging node will be placed before or after the folder-node instead to be placed inside the folder.
scrollAreaHeight	Number	70	Offset in pixels from top and bottom for the component element. While dragging cursor is in that area, the scrolling starts.
maxScrollSpeed	Number	20	The scroll speed is relative to the cursor position. Defines the max scroll speed.

Computed props

prop	type	description
nodes	ISlTreeNode[]	List of nodes with some computed props. See ISlTreeNode interface.
cursorPosition	ICursorPosition	Represents the current cursor position that describes the action that will be applied to the dragged node while mouseup event. See ICursorPosition interface
selectionSize	Number	The count of selected nodes
isDragging	Boolean	True if nodes are dragging

interface ICursorPosition<TDataType> {
  node: ISlTreeNode<TDataType>;
  placement: 'before' | 'inside' | 'after';
}  

Events

event	callback arguments	description
input	nodes: ISlTreeNodeModel[]	triggers for any changes for value property
select	selectedNodes: ISlTreeNode[], event: MouseEvent	triggers when a node has been selected/deselected
toggle	toggledNode: ISlTreeNode, event: MouseEvent	triggers when a node has been collapsed/expanded
drop	draggingNodes: ISlTreeNode[], position: ICursorPosition, event: MouseEvent	triggers when dragging nodes have been dropped
nodeclick	node: ISlTreeNode, event: MouseEvent	handle click event on node
nodedblclick	node: ISlTreeNode, event: MouseEvent	handle dblclick event on node
nodecontextmenu	node: ISlTreeNode, event: MouseEvent	handle contextmenu event on node

Methods

method	description
getNode(path: number[]): ISlTreeNode	Find the node by using it's path
traverse(cb: (node: ISlTreeNode, nodeModel: ISlTreeNodeModel, siblings: ISlTreeNodeModel[]) => boolean)	Helpful method to traverse all nodes. The traversing will be stopped if callback returns false.
updateNode(path: number[], patch: Partial)	Update the node by using it's path
select(path: number[], addToSelection = false)	Select the node by using it's path
getNodeEl(): HTMLElement	Get the node HTMLElement by using it's path
getSelected(): ISlTreeNode[]	Get selected nodes
remove(paths: number[][])	Remove nodes by paths. For example .remove([[0,1], [0,2]])
getFirstNode(): ISlTreeNode	Get the first node in the tree
getLastNode(): ISlTreeNode	Get the last node in the tree
getNextNode(path: number[], filter?: (node: ISlTreeNode) => boolean): ISlTreeNode;	Get the next node. You can skip the next nodes by using filter
getPrevNode(path: number[], filter?: (node: ISlTreeNode) => boolean): ISlTreeNode;	Get the previous node. You can skip the previous nodes by using filter

Slots

slot	context	description
title	ISlTreeNode	Slot for item title
toggle	ISlTreeNode	Slot for expand/collapse button
sidebar	ISlTreeNode	Sidebar content
draginfo	SlVueTree	Slot that follows the mouse cursor while dragging. By default shows the dragging nodes count.

Example:

handle keydow and keyup events via getNextNode and getPrevNode methods

demo

Example:

add a folder or item icon via title slot

<sl-vue-tree v-model="nodes">
    <template slot="title" slot-scope="{ node }">

      <span class="item-icon">
        <i class="fa fa-file" v-if="node.isLeaf"></i>
        <i class="fa fa-folder" v-if="!node.isLeaf"></i>
      </span>
    
      {{ node.title }}
      
    </template>
</sl-vue-tree>

Example:

select all nodes

slVueTree.traverse((node, nodeModel, path) => {
    Vue.set(nodeModel, 'isSelected', true);
})

GitHub