onBeforeDelete

fires before an item is removed

function onBeforeDelete(
    // the ID of the item
    id: string|number
): boolean

Returns

boolean returning false will prevent the item from being removed

Example

grid.data.attachEvent("onBeforeDelete", function(id){
    //... some code here ...
    // return false to block operation
    return true;
});

Details

Returning false from the event handler will block further processing, and the item will not be deleted.