jqwidgets-framework/demos/Angular/src/tree/keyboardnavigation/app.component.html

jQWidgets is an advanced Angular, Vue, Blazor, React, Web Components, jquery, ASP .NET MVC, Custom Elements and HTML5 UI framework.

<jqxTree style="float: left;"#myTree tabindex="1"
         [width]="250" [height]="350" [source]="source">
</jqxTree>

<div style="font-family: Verdana; font-size: 12px; width: 400px; margin-left: 20px; float: left;">
  <ul>
    <li><b>Tab</b> - Like other widgets, the jqxTree widget receives focus by tabbing into it. Once focus is received, users will be able to use the keyboard to change the selection. A second tab will take the user out of the widget.</li>
    <li><b>Shift+Tab</b> - reverses the direction of the tab order. Once in the widget, a Shift+Tab will take the user to the previous focusable element in the tab order.</li>
    <li><b>Up and Down</b> arrow keys - move between visible items.</li>
    <li><b>Left Arrow</b> key - on an expanded item, collapses the item.</li>
    <li><b>Left Arrow</b> key - on a collapsed or end item moves focus to the item's parent item.</li>
    <li><b>Right Arrow</b> key - on a collapsed item expands the item.</li>
    <li><b>Right Arrow</b> key - on an expanded item, moves to the first child item, or does nothing on an end item.</li>
    <li><b>Home</b> key - moves to the top item in the tree view.</li>
    <li><b>End</b> key - moves to the last item in the tree view.</li>
  </ul>
</div>