3.26. Finishing up serveDrink()

Let's spend a little time practicing with the JavaScript substring() method, using the string you saw on the last two pages.

function serveDrink() {

  if (request.readyState == 4)These two lines should be
  pretty routine by now. {

    if (request.status == 200) {

      var response = request.responseText;

      var whichCoffeemaker = response.substring(0, 1);We want
      just the very first position in order to get the number of the coffee
      maker that finished up.

      var name = response.substring(1, response.length);The name
      returned by the server starts in the second position ("1"), and goes to
      the end of the string.

      if (whichCoffeemaker == "1") {

        var coffeemakerStatusDiv1 =

          document.getElementById("coffeemaker1-status");

        replaceText(coffeemakerStatusDiv1, "Idle");This code
        updates the status of whichever coffee maker finished brewing.

      } else {

        var coffeemakerStatusDiv2 =

          document.getElementById("coffeemaker2-status");

        replaceText(coffeemakerStatusDiv2, "Idle");

     }
     This last bit just lets the person who placed an order
     know that his coffee is now ready.
     alert(name + ", your coffee is ready!");

   } else

     alert("Error! Request status is " + request.status);

  }

}

So are we done? I'm ready to check this new coffee maker out for myself.