SelectAllCheckboxState

Represents the possible states of the select-all checkbox.

html

 <kendo-grid-column>
  <ng-template kendoGridHeaderTemplate>
    <input
      kendoGridSelectAllCheckbox
      state="indeterminate"
       ...
    />
   </ng-template>
 <kendo-grid-column>

type SelectAllCheckboxState = "checked" | "unchecked" | "indeterminate";