javascript - Using $(this) in JQuery -

i have table binding jquery datatable. there 3 check boxes in each table/grid row- book,modify,view. aim check validation when saving grid/table. if of row has 3 check boxes unchecked, want display validation message(i.e. checking @ least 1 checkbox mandatory). check validation wrote code below-

function validate() {     $(grid1.fngetdata()).each(function () {         if ($(this).has('true')) {             return true;         }     });     return false; } 

$(this) have values -

book: false id: 945 modify: false name: "adgas" view: false 

how can re-write code whenever book,modify , view have value false

ps: there can multiple rows unchecked or mixed

function validate() {     var allok = true;      $(grid1.fngetdata()).each(function () {         var row = $(this);         if (!row.book && !row.modify && !row.view)         {             allok = false;             }      });     return alok; // make `validate` return true if rows validate. }