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Showing content from https://docs.dhtmlx.com/suite/tree/configuration/ below:

JavaScript Tree - Configuration | DHTMLX Suite 9 Docs

Configuration Checkboxes for items​

DHTMLX Tree provides enhanced system of checkbox manipulations. In addition to standard two-state checkboxes that allow check/uncheck tree items, it also uses three-state checkboxes that include an intermediate state, when just some children of a parent item are checked.

In order to enable checkboxes for items, make use of the checkbox configuration option:

const tree = new dhx.Tree("tree_container", {checkbox: true});

Related sample: Tree. Inline editing, drag-and-drop and checkboxes

Collapsed mode​

To initialize a tree in the collapsed state, use the collapsed property:

const tree = new dhx.Tree("tree_container", {
collapsed: true,
});

Related sample: Tree. Collapsed mode

Editing of items​

It is possible to enable editing of the text of Tree items before initialization of the component using the editable configuration property:

const tree = new dhx.Tree("tree_container", {editable: true});

Related sample: Tree. Inline editing, drag-and-drop and checkboxes

Key navigation​

You can switch on key navigation in a tree with the keyNavigation property before initialization of the component:

const tree = new dhx.Tree("tree_container", {keyNavigation: true});

After that you need to select any item and then apply Arrow keys:

Up arrow key to move selection to the item above the currently selected one Down arrow key to move selection to the item below the currently selected one Right arrow key to open a selected folder Left arrow key to close a selected opened folder

Related sample: Tree. Key navigation

Selection of items​

Related sample: Tree. Disable selection

The default configuration of Tree provides you with the selection feature that allows highlighting a Tree item. To disable selection in a Tree you need to set the selection configuration property to false:

const tree = new dhx.Tree("tree_container", {
selection: false,
});

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