src/main/resources/public/js/zTree_v3/demo/js/keyboard_navigation.js

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/*
 * JQuery zTree keyboard navigation extension
 * zTree v3.5.42 or later
 * http://www.xbrlquery.com/
 *
 * Copyright (c) 2019 Bill Seddon
 *
 * Licensed same as jquery - MIT License
 * http://www.opensource.org/licenses/mit-license.php
 *
 * Date: 2020-02-18
 */

( function ($) 
{
	/**
	 * Creates a function that adds keyboard navigation:
	 * Home: home key (keycode 36)				Goes to the first root element is visible
	 * End: end key (keycode 35)				Goes to the last leaf node and will expand nodes and scroll the element into view
	 * Down: right cursor key (keycode 39)		Goes to the next visible node in the tree following the hierarchy
	 * Next: down cursor key (keycode 40)		Goes to the next visible node at the same level
	 * Up: up cursor key (keycode 37)			Goes to the prior visible node at the same level
	 * Previous: left cursor key (keycode 38)	Goes to the prior visible node following the hierarchy
	 * Toggle: space key (keycode 32)			Toggles the expand/collapse state of a parent node
	 */
	$.fn.zTreeKeyboardNavigation = function(zTree, element)
		{
			if (typeof element === 'string' || element instanceof String)
			{
				element = $(element);
			}

			var rootNodes = zTree.getNodes();
			if ( ! rootNodes ) return;

			var focusSelectedNode = function()
			{
				if( ( selectedNodes = zTree.getSelectedNodes() ) && selectedNodes.length )
				{
					$("#" + selectedNodes[0].tId ).focus();
				}
			}

			$(element).bind( 'keydown', function( e )
				{
					var selectedNodes = zTree.getSelectedNodes();
					var selectedNode = selectedNodes.length ? selectedNodes[0] : null;

					var processSpace = function()
					{
						// If there are no nodes or the selected node is not a parent, get out
						if ( selectedNode && selectedNode.isParent )
						{
							// Toggle the node
							zTree.expandNode( selectedNode, null, null, null, false );
						}
					}
					
					var processHome = function()
					{
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