A Simple Treeview Component for VueJS with No Added Dependencies

Vue Teatree

A simple treeview component for VueJS with no added dependencies.

Install

yarn add vue-teatree # (or use npm)

https://www.npmjs.com/package/vue-teatree

Example

Import your components:

import { Teatree, NodeType, NodeName, NodeToggle } from "vue-teatree";

Teatree is the main component you will pass your data to (below).
NodeType contains the Typescript interface that defines each node type.
NodeName is a pre-built component you will pass into a slot.
NodeToggle is a pre-built component you will pass into a slot.

NodeName and NodeToggle are provided as a convenience. Feel free to write your own.

Prepare your data

const data: NodeType[] = [
  {
    name: "parent",
    show: true,
    showChildren: true,
    selected: false,
    children: [
      {
        name: "child",
        show: true,
        showChildren: true,
        selected: false,
        children: [
          {
            name: "grandchild",
            show: true,
            showChildren: true,
            selected: false,
            children: [],
          },
        ],
      },
    ],
  },
];

Pass it into Teatree

<Teatree :roots="data">
  <template slot="node-toggle" slot-scope="{ node }">
    <NodeToggle :node="node" />
  </template>
  <template slot="node-name" slot-scope="{ node }">
    <NodeName
      :node="node"
      :handleNodeLeftClick="() => {}"
      :handleNodeRightClick="() => {}"
    />
  </template>
</Teatree>

More details

The Teatree treeview is purely a function of your data. If you want to make changes to the treeview (e.g. toggling children, hiding nodes etc.) you should modify the data object.
NodeToggle and NodeName can be replaced with your own components and passed into the node-toggle and node-name slots respectively.

NodeType

Teatree accepts an array of NodeType as its roots prop. This means you can render multiple roots in the treeview.

interface NodeType {
  // show: toggling this will show/hide the node and its children
  show: boolean;
  // showChildren: toggling this will toggle its children
  showChildren: boolean;
  // selected: toggling this will apply the "selected" CSS style
  selected: boolean;
  // children: the children must also conform to the node specification
  children: Array<NodeType>;
  // name: the name of the node
  name: string;
  // icon: base64 encoded icon (optional)
  icon?: string;
  // data: payload by the user of the library (optional)
  data?: object;
}

NodeToggle

It is a pre-built component to render the node’s toggle. If you want to implement your own, take a look at the source code!

Props:

Name	Type	Required	Notes
`node`	`NodeType`	Yes

NodeName

It is a pre-built component to render the node’s name. If you want to implement your own, take a look at the source code!

It has a number of props that can be wired up to provide additional functionality (track clicks etc.):

Name	Type	Required	Notes
`node`	`NodeType`	Yes
`handleNodeLeftClick`	`(event: any, node: NodeType) => any`	Yes	Pass an empty function `() => {}` if you don’t have one.
`handleNodeRightClick`	`(event: any, node: NodeType) => any`	Yes	Pass an empty function `() => {}` if you don’t have one.

Styling

Import default styles using: @import "~vue-teatree/build/Teatree.css";

Here are all the default styles. Override them to your liking:

Teatree

.teatree {
  cursor: pointer;
  height: 100%;
  overflow: hidden;
}

.teatree-node {
  padding-right: 0.25rem;
}

.teatree-node-item {
  display: flex;
  align-items: center;
  height: 1.5rem;
  background: transparent;

  /* hack to make hover the full width of parent */
  padding-left: 100%;
  margin-left: -100%;
  padding-right: 100%;
  margin-right: -100%;
}

.teatree-node-item:hover {
  background-color: #718096;
}

.teatree-node-item-selected {
  background-color: #718096;
}

.teatree-node-item-name-padded-leaf {
  padding-left: 1.25rem;
}

NodeToggle

.teatree-node-item-icon {
  display: flex;
  align-items: center;
  margin-left: 0.5rem;
  color: #cbd5e0;
}

NodeName

.teatree-node-item-name {
  display: inline-block;
  font-size: 0.875rem;
  color: #a0aec0;
  margin-left: 0.5rem;
  user-select: none;

  /* truncate */
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.teatree-node-item-name-padded {
  padding-left: 1.5rem;
}

Common use cases

The following code/advice is not well tested. Apologies for any errors.

Toggle everything shut

You can achieve an effect similar to VSCode where you can toggle/collapse all nodes closed. You need to write a simple tree-traversal:

const toggleTreeClosed = (rootNode: NodeType) => {
  rootNode.showChildren = false;
  rootNode.children.forEach((child) => toggleTreeClosed(child));
};

Hide leaves

If you’re using the treeview for a file explorer, it might be useful to hide the leaves, and only show the parent directories. You can use the show node property to hide the leaf nodes.

const isLeaf = (node: NodeType) => {
  return !node.children.length;
};

const hideTreeLeaves = (rootNode: NodeType) => {
  if (isLeaf(rootNode)) {
    rootNode.show = false;
  } else {
    rootNode.children.forEach((child) => hideTreeLeaves(child));
  }
};

Show a right-click menu

You’ll need something like: https://github.com/rawilk/vue-context.

Use the handleNodeRightClick component prop to call the context menu:

export default class MyComponent extends Vue {
  handleNodeRightClick(node: NodeType, event: any) {
    this.$refs.menu.open(event, node);
  }
}

<vue-context ref="menu">
  <template slot-scope="child">
    <your-menu-component :node="child.data" />
  </template>
</vue-context>

Download Details:

Author: sarimabbas

Live Demo: https://sarimabbas.github.io/vue-teatree/

GitHub: https://github.com/sarimabbas/vue-teatree

#vuejs #javascript #vue-js #vue