Get the grid values based on the row index on the client side in JavaScript
function onColAttViewButtonClick(gridIndex) {
gvCollectionNotes.GetRowValues(gridIndex, 'CustomerNumber;CompanyName;ID', OnColGetATTViewRowValues);
}
//function is called when onAttViewButtonClick completes its callback
function OnColGetATTViewRowValues(values) {
CustomerNum = values[0];
CompanyName = values[1];
var colID = values[2];
gvColAttachments.PerformCallback(CustomerNum + "|" + CompanyName + "|" + "ShowData" + "|" + colID);
popColDownload.Show();
}