Multi Select Box With Tree Structured Data Dropdown List

Dmitry Zhuravkov February 10, 2023


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A user-friendly multi select JS library that allows the user to select single or multiple options from a tree-style hierarchical dropdown list.


Import the Treeselect's JavaScript and Stylesheet

import Treeselect from '../dist/treeselect-js.mjs.js';

Create an empty DIV container to hold the Multi-Select dropdown box

Define your nested options as follows

const options = [
    name: 'JavaScript',
    value: 'JavaScript',
    children: [
        name: 'React',
        value: 'React',
        children: [
          name: 'React.js',
          value: 'React.js',
          children: []
          name: 'React Native',
          value: 'React Native',
          children: []
        name: 'Vue',
        value: 'Vue',
        children: []
    name: 'HTML',
    value: 'html',
    children: [
        name: 'HTML5',
        value: 'HTML5',
        children: []
        name: 'XML',
        value: 'XML',
        children: []

Initialize the Treeselect and populate the Multi-Select dropdown box with the data you just created

const treeselect = new Treeselect({
  parentHtmlContainer: document.querySelector('.example'),
  options: options,

Available options to customize the Treeselect

const treeselect = new Treeselect({
  // parent container element
  parentHtmlContainer: HTMLElement,
  // an array of option values
  value: [],
  // define your options here
  options: [],
  // keep the tree select always open
  alwaysOpen: true,
  // open all options to this level
  openLevel: 0,
  // append the Treeselect to the body
  appendToBody: false,
  // shows selected options as tags
  showTags: true,
  // text to show if you use 'showTags'
  tagsCountText: '{count} {tagsCountText}',
  // shows remove icon
  clearable: true,
  // is searchable?
  searchable: true,
  // placeholder text
  placeholder: 'Search...',
  // text to display when no results found
  emptyText: 'No results found...',
  // converts multi-select to the single value select
  isSingleSelect: false,
  // returns groups if they selected instead of separate ids
  isGroupedValue: false,
  // It is impossible to select groups. You can select only leaves.
  disabledBranchNode: false,
  // auto, top, bottom
  direction: 'auto',
  // shows count of children near the group's name.
  showCount: false,
  // group options
  grouped: true,
  // element that appends to the end of the dropdown list
  listSlotHtmlComponent: null,
  // is dropdown list disabled?
  disabled: false,
  // add the list as a static DOM element
  // this prop will be ignored if you use appendToBody.
  staticList: false,
  // id attribute for the accessibility.
  id: '',
  // { arrowUp, arrowDown, arrowRight, attention, clear, cross, check, partialCheck }
  // object contains all svg icons
  iconElements: {},
  srcElement: null,
  // callback and functions
  inputCallback: undefined,
  openCallback: undefined,
  closeCallback: undefined,
  nameChangeCallback: undefined,
  mount: () => void,
  updateValue: (newValue: ValueOptionType[]) => void,
  destroy: () => void,
  focus: () => void,
  toggleOpenClose: () => void,

Trigger a function every time an option has been selected

treeselect.srcElement.addEventListener('input', (e) => {

API methods

// update options
// remount and update settings
// toggle between open & close
// set focus on treeselect input without open/close state changes.
// destroy the instance


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