$(document).ready(function() {

    $(document).on("click","a#Ribbon\\.ListItem\\.Manage\\.Delete-Medium",function() {
        debugger;
        if($('a#Ribbon\\.ListItem\\.Manage\\.Delete-Medium:not(.ms-cui-disabled)').length > 0){
            var selectedRows = $('table[summary="TestList"] tr[class*="s4-itm-selected"]');

            for (let item of selectedRows) {
                $.ajax
                ({
                    url: _spPageContextInfo.webAbsoluteUrl + "/_api/web/sitegroups/getbyname('SharePointTestGroup')/users/getbyemail('" + item.cells[2].innerText + "')",
                    type: "POST",
                    headers:
                    {
                        "Accept": "application/json;odata=verbose",
                        "Content-Type": "application/json;odata=verbose",
                        "IF-MATCH": "*",
                        "X-HTTP-Method": "DELETE",
                        "X-RequestDigest": $("#__REQUESTDIGEST").val()
                    },
                    success: function (data, status, xhr) {
                        debugger;
                        console.log('deleted');
                    },
                    error: function (xhr, status, error) {
                        debugger;
                        console.log("Failed");
                    }
                });
            }
        }
    });
});