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jQuery Tic-Tac-Toe

Note: This lab does not work on the Learn IDE (we are in the process of upgrading it!). You can skip it for now and come back to it when it's upgraded OR you can switch to a local environment:


Make a tic-tac-toe game that behaves like the following video.

Right click on the link below and select "Save link as..." to see a video of how your game should behave.



You may never have built a "single page app" before so check out the directory structure. Here we're using a Rails app to serve up some HTML. There's really only one view, the main root route. Once rails loads that everything will be done using AJAX with rails serving as our API.

We'll be leveraging the asset pipeline to load all our JavaScript so check out the manifest. The main HTML file is in views/home/index.html Our JS code needs to do two things. We'll first need to create a simple game of Tic Tac Toe. Once that's done we'll need to figure out how to let the user persist the state of their game and see old games. Lastly the user should be able to click on an old game and resume playing that game.

The grid is made by a table. Each square is in a table row, or tr and each square is a table data, or td (you could also call this a cell).

Each td has two data attributes: x and y coordinates. The top left td had an x of 0 and a y of 0.

<td data-x="0" data-y="0"></td>

The middle td has an x of 1 and a y of 1.

<td data-x="1" data-y="1"></td>

The lower right corner has an x of 2 and a y of 2.

<td data-x="2" data-y="2"></td>

JavaScript TTT

For the actual TTT functionality, we've given you a lot of structure and the tests force you down a pretty specific path as far as what functions you should define and what they should do.

  • attachListeners()
    • You must have a function called attachListeners() which the tests call to attach the click handlers to the page after the DOM has been loaded
    • When a client clicks on a cell, the function doTurn() should be called and passed a parameter of the event
  • doTurn()
    • Increment the variable turn by one
    • Should call on the function updateState() and pass it the event
    • Should call on checkWinner()
  • player()
    • If the turn number is even, this function should return the string "X", else it should return the string "O"
  • updateState()
    • This method should call on player() and add the return value of this function to the clicked cell on the table
  • checkWinner()
    • This function should evaluate the board to see if anyone has won
    • If there is a winner, this function should make one of two strings: "Player X Won!" or "Player O Won!". It should then pass this string to message().
  • message()
    • This function should accept a string and add the string to the div with an id of "message"


Because this is the final project in the JavaScript section, for the persistence functionality we've intentionally left the implementation vague. The tests are integration tests which actually simulate a user clicking around in the browser rather than us telling you exactly what functions to define and what they should do. In theory it wouldn't matter what backend framework and language you used to implement the functionality. In practice, there are some rspec tests that make sure your server responds in a sensible way. The only thing the tests require is that the server responds to a few routes:

  • GET "/games"
  • POST "/games/:id"
  • PATCH "/games/:id"

Note On the JavaScript side the actual tests will mock out the responses so your backend should send the responses the front end tests are simulating.

Running learn will only run the Jasmine tests. If you want to run the Rspec tests, make sure you run rspec separately. If you seem to be having issues running the Rspec tests, run spring stop followed by rspec.


View jQuery Tic Tac Toe on and start learning to code for free.


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  • Ruby 12.2%
  • HTML 3.1%
  • CSS 2.1%