An Angular 2 tree component with checkbox and multiple level
Branch: master
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.

ng2-dropdown-treeview Build Status npm version

An Angular 2 tree component with checkbox and multiple level.

This component is discontinued anymore. It's compatible with both Angular 2 & 4.
But if you are using Angular 4, should switch to my new component ngx-treeview


You can customize CSS yourself to break down dependencies to Bootstrap & Font Awesome.


  • Unlimited tree levels
  • Item state: checked, disabled
  • Collapse / Expand
  • Text filtering
  • Internationalization (i18n) support
  • Template



After install the above dependencies, install ng2-dropdown-treeview via:

npm install --save ng2-dropdown-treeview

Once installed you need to import our main module in your application module:

import {DropdownTreeviewModule} from 'ng2-dropdown-treeview';

  declarations: [AppComponent, ...],
  imports: [DropdownTreeviewModule.forRoot(), ...],  
  bootstrap: [AppComponent]
export class AppModule {


Treeview dropdown:


Treeview without dropdown:


config is optional. This is the default configuration:

   isShowAllCheckBox: true,
   isShowFilter: false,
   isShowCollapseExpand: false,
   maxHeight: 500

You can change default configuration easily because TreeviewConfig is injectable.

Pipe leoTreeview:

To map your JSON objects to TreeItem objects.

    [items]="items | leoTreeview:'textField'"

Create a TreeviewItem:

const itCategory = new TreeviewItem({
   text: 'IT', value: 9, children: [
           text: 'Programming', value: 91, children: [{
               text: 'Frontend', value: 911, children: [
                   { text: 'Angular 1', value: 9111 },
                   { text: 'Angular 2', value: 9112 },
                   { text: 'ReactJS', value: 9113 }
           }, {
               text: 'Backend', value: 912, children: [
                   { text: 'C#', value: 9121 },
                   { text: 'Java', value: 9122 },
                   { text: 'Python', value: 9123, checked: false }
           text: 'Networking', value: 92, children: [
               { text: 'Internet', value: 921 },
               { text: 'Security', value: 922 }

You can pass the second paramater 'autoCorrectChecked' with value=true (default is false) in constructor of TreeviewItem to correct checked value of it and all of its descendants. In some cases, you need to push or pop children flexibly, checked of parent may be not correct. Then you need to call function correctChecked() to help to correct from root to its descendants.

const vegetableCategory = new TreeviewItem({
   text: 'Vegetable', value: 2, children: [
       { text: 'Salad', value: 21 },
       { text: 'Potato', value: 22 }
vegetableCategory.children.push(new TreeviewItem({ text: 'Mushroom', value: 23, checked: false }));
vegetableCategory.correctChecked(); // need this to make 'Vegetable' node to change checked value from true to false


Extract data from list of checked TreeviewItem and send it in parameter of event selectedChange. Some built-in TreeviewEventParser:

  • DefaultTreeviewEventParser: return values of checked items.
  • DownlineTreeviewEventParser: return list of checked items in orginal order with their ancestors.
  • OrderDownlineTreeviewEventParser: return list of checked items in checked order with their ancestors. Note that: value of a leaf must be different from value of other leaves.

TreeviewItem Template:

See example 4.


I am very appreciate for your ideas, proposals and found bugs which you can leave in github issues. Thanks in advance!