indeterminate selection option for Tree table template

[Anzil-Aufait]

Is there any indeterminate selection option for Tree table grouping.
Only select all or unselect all option.

[mazdik]

<ng-template #rowCheckboxTemplate let-row="row">
  <span class="{{'dt-' + table.settings.selectionMode}}">
        <input [type]="table.settings.selectionMode"
              [checked]="table.selection.isSelected(this.row.$$index)"
              [indeterminate]="partiallySelectedRow(row)"
              (click)="onCheckboxClick(row)"/>
  </span>
</ng-template>

  getDescendants(row: Row) {
    const results = [];
    for (let i = row.$$index + 1; i < this.rows.length && row.$$level < this.rows[i].$$level; i++) {
      results.push(this.rows[i]);
    }
    return results;
  }

  partiallySelectedRow(row) {
    let descendant = this.getDescendants(row);
    // find any selected row
    // this.selection.isSelected(descRow.$$index)
  }

[Anzil-Aufait]

@mazdik , onCheckboxClick(row) there is no function with this name.

I'm adding an extra checkbox for dtHeaderTemplate template to select it's child rows.
Because there is no option for row multiselect in your work.

This is my stackblitz demo

[mazdik]

  onCheckboxClick(row: Row) {
    this.table.selection.toggle(row.$$index);
    this.table.events.onCheckbox(row);
  }

[Anzil-Aufait]

  onCheckboxClick(row: Row) {
    this.table.selection.toggle(row.$$index);
    this.table.events.onCheckbox(row);
  }

It's not working as expected.
It only selecting the first sibling, you can check here