application.js

$(function(){
  // Collect all text boxes
  $textboxes = $(":text");

  // call checkForEnter function when a key is pressed
  $textboxes.keydown(checkForEnter);

  // This function checks if the Enter key is pressed
  // If yes then moves the cursor to the next box
  function checkForEnter(event) {
    if (event.keyCode == 13) {
      numCurrentTextbox = $textboxes.index(this);
      if (numCurrentTextbox + 1 != null) {
        event.preventDefault();
        nextTextbox = $textboxes[numCurrentTextbox + 1];
        nextTextbox.select();
        return false;
      }
    }
  }
});