An Angular treeview component with checkbox

• Angular
• Lodash
• Bootstrap 4
• Font Awesome 4

This component is currently supporting Bootstrap 4. If you are using Bootstrap 4 alpha 6, please downgrade to the older version 1.0.10.

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

• Unlimited tree level
• State: disabled / collapse, expand
• Filtering
• Internationalization (i18n) support
• Template
• Checkbox with tri-state

After install the above dependencies, install ngx-treeview via:

npm install ngx-treeview --save

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

import { TreeviewModule } from 'ngx-treeview';

@NgModule({
  declarations: [AppComponent, ...],
  imports: [TreeviewModule.forRoot(), ...],  
  bootstrap: [AppComponent]
})
export class AppModule {
}

<ngx-treeview
    [config]="config"
    [items]="items"
    (selectedChange)="onSelectedChange($event)"
    (filterChange)="onFilterChange($event)">
</ngx-treeview>

<ngx-dropdown-treeview
    [buttonClass]="buttonClass"
    [config]="config"
    [items]="items"
    (selectedChange)="onSelectedChange($event)"
    (filterChange)="onFilterChange($event)">
</ngx-dropdown-treeview>

config is optional. This is the default configuration:

{
   hasAllCheckBox: true,
   hasFilter: false,
   hasCollapseExpand: false,
   decoupleChildFromParent: false,
   maxHeight: 500
}

You can change default configuration easily because TreeviewConfig is injectable.

To map your JSON objects to TreeItem objects.

<ngx-dropdown-treeview
    [config]="config"
    [items]="items | ngxTreeview:'textField'"
    (selectedChange)="onSelectedChange($event)">
</ngx-dropdown-treeview>

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 }
           ]
       }
   ]
});

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.
• 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.

See example 4 & 5.

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