How to handle java script/error/exception alert using WebDriver

WebDriver would support handling js alerts using Alert interface.

         

          // Bring control on already opened alert

               Alert alert = driver.switchTo().alert();

          // Get the text/message of the alert or prompt

               alert.getText(); 

         

         // Click ok button of alert

              alert.accept();

         // Click Cancel button of alert

              alert.dismiss();