A Simple vue3 project for rendering items in a tree.

npm i vue3-tree-vue

<template>    
    <vue3-tree-vue :items="items" 
                   :isCheckable="false"  //Set to true if you want to get checkable items
                   :hideGuideLines="false"
                   @onCheck="onItemChecked"
                   @dropValidator="onBeforeItemDropped"
                   @onSelect="onItemSelected"
                   @onExpand="onItemExpanded"
                   >
      <!-- Applying some simple styling to tree-items -->
       <template v-slot:item-prepend-icon="treeViewItem" >
              <img src="https://github.com/geekhybrid/vue3-tree-vue/raw/main/assets/folder.svg"
                   alt="folder"
                   v-if="treeViewItem.type === 'folder'"
                   height="20" width="20" />
       </template>
    </vue3-tree-vue>
</template>

import 'vue3-tree-vue/dist/style.css'; // remember to add this in your component or maint.[ts/js]

  setup() {
    const onItemChecked = (checkedItems: TreeViewItem[]) => console.log(checkedItems);
    const onItemSelected = (item: TreeViewItem) => console.log(item);
    const onBeforeItemDropped = (droppedItem: TreeViewItem, dropHost: TreeViewItem | undefined) => {
      // dropHost == undefined means dropping at the root of the tree.

      // Here you can specify any kind of drop validation you will like.
      // this function should return true if the drop operation is valid.

      if (dropHost.type !== playlist) return false
      return true;
    }
    const onItemExpanded = (expandedItem: TreeViewItem) => {
      //to use this feature properly you need to set lazyLoad property as true 
      //fetch data
      const lazyLoadedItems = fetchFromApi(...);
      expandedItem.children.push(...lazyLoadedItems)
    }
    const items = ref<TreeViewItem[]>([]); // define your tree items here.

    return {
      onItemChecked,
      onItemSelected,
      onBeforeItemDropped,
      onItemExpanded,
      items
    }
  }

Selectable Tree Items

Checkable Tree Items

Drag and Drop

Properties of the TreeView

Basic properties of each tree-node.

export interface TreeViewItem {
  name: string;
  id?: string | number;
  children?: TreeViewItem[];
  checked?: boolean;
  selected?: boolean;
  expanded?: boolean;
  disabled?: boolean;// When disabled, an item can neither be selected nor checked
  meta?: any;// provides meta-data of any type per node.
}

Event Handlers

The `onCheck` event may be fired more than once to show the change in state of deep hierachies.

Styles

Slots

Classes