For csv export there is the ngGridCsvExportPlugin that you can find here

Just at a reference to the script and add the ngGridCsvExportPlugin to the gridOptions
(and activate the footer too by adding showFooter : true to the gridOption)

 $scope.gridOptions = {

        data: 'myData',

        plugins: [new ngGridCsvExportPlugin()],

        showFooter: true,

      };

A basic plunker where you can see it at work can be found here