How to get all the ID of all checked checkbox inside a Jquery bootgrid?

The entire code works and the bootgrid is populated by data's. I have 2 rows inside the bootgrid and when I click the checkbox, it alerts the ID.

If I put a check on the other checkbox, it also pop up the id. My problem is, how can I get all the ID if I check the check all box (TITLE)?

Once I click the check all box, it alerts an ID, but only the last one, which is the Admin. How can I get all the ID of all checked box? Here is my code.

var table = $('#user-list');

table.bootgrid({
    css     : {
        icon        : 'zmdi icon',
        iconColumns : 'zmdi-view-list',
        iconDown    : 'zmdi-caret-down',
        iconRefresh : 'zmdi-refresh',
        iconUp      : 'zmdi-caret-up',
    },
    labels  : {
        noResults   : noResult,
        loading     : loadingTable,
    },
    ajax         : true,
    url          : '/users/list',
    selection    : true,
    rowCount     : [10, -1],
    multiSelect  : true,
    navigation   : 2,
}).on("selected.rs.jquery.bootgrid", function(e, rows)
{
    alert("Selected: " + rows[0].id);
});