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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <main>
  
  <div class="container">
    <h1>Tic Tac Toe</h1>
    <p>Choose your marker and opponent to begin</p>
    <!-- THIS SHOULD BE ANIMATED -->
    <div class="player-start">
      <div id="player-select-container">
         <h3>Choose marker</h3>
         <button class="js-player-select playerX" id="player-X" value="X">X</button> 
         
         <button class="js-player-select playerO" id="player-O" value="O">O</button>
      </div>
      <div id="opponent-select-container" class="js-hidden">
        <h3>Choose opponent</h3>
        <button class="opponent AI" value="AI">COMPUTER</button> 
        <button class="opponent HUMAN" value="HUMAN">HUMAN</button>
      </div>
      <button class="js-reset" id="reset">RESET</button> 
    </div>
    <!-- END animated div -->
    <div class="js-gameboard" id="gameboard"></div>

  </div>
</main>
<footer>
  <h2>Built by Jack</h2>
</footer>
<script src="js/index.js"></script><!-- </html> -->
            
          
!
            
              /* Page styles */
html {
  background: -webkit-linear-gradient(90deg, #dee1e1 10%, #f4f4f4 90%); /* Chrome 10+, Saf5.1+ */ 
  background: -moz-linear-gradient(90deg, #dee1e1 10%, #f4f4f4 90%); /* FF3.6+ */background: linear-gradient(90deg, #dee1e1 10%, #f4f4f4 90%); /* W3C */
  height: 100vh;
  position: relative;
}
h1, h2, h3, h4, h5, p {
  margin: 0;
}
body {
  font-family: Tahoma;
  font-size: 20px;
  margin: 0; /* bottom = footer height */
}
footer {
  bottom: 2px;  
  height: 40px;  
  margin-top: 40px;  
  text-align: center;  
  vertical-align: middle; 
  position: relative;
  width:100%;
}
.container {
  text-align: center;
}
/* END Page styles */

/* Buttons */
button {
  background: white;
  cursor: pointer;
  margin: .5em;
  padding: 1em;
}
.playerX {
  margin-right: 1em;
}
.playerO {
  margin-left: 1em;
}
.js-reset {
  margin: 1em auto;
}
button:hover, .tile:hover  {
  background: #D7D6D7;
  cursor: pointer;
  -webkit-transition: .3s ease;
          transition: .3s ease;
}
/* END Buttons */

/* Gameboard */
.js-gameboard {
  box-shadow: 1px 1px 1px 1px rgba(0, 0, 0, 0.45);
  height: 14.65em;
  margin: 0 auto;
  width: 15em;
}
.tile {
    width: 5em;
    height: 5em;
    border: 1px solid black;
    background-color: white;
    display: inline-block;
    margin: -1px;
    margin-bottom: -5px
}
.checked:after {
  content: attr(data-check);
  font-size: 3em;
  line-height: 1.5em;
  padding: .4em;
} 
.active-tile {
  pointer-events: auto;
}
.inactive-tile {
  pointer-events: none;
}

/* Player Start UI */
.player-start {
  margin: .5em auto;
  width: 75%;
  padding: .5em;
}
#opponent-select-container {
  display: none;
}
/* END Player Start UI */
            
          
!
            
              /* TO DO
=> Learn the minimax algorithm
=> refactor
*/
// Set global player variables
var opponent,
  player_mark;
/* Set winning tiles */
var winners = [
  [0, 1, 2],
  [3, 4, 5],
  [6, 7, 8],
  [0, 3, 6],
  [1, 4, 7],
  [2, 5, 8],
  [0, 4, 8],
  [6, 4, 2]
];
var opponent_button_container = document.getElementById("opponent-select-container"),
      opponent_buttons          = document.querySelectorAll(".opponent"),
      player_button_container   = document.getElementById("player-select-container"),
      player_buttons            = document.querySelectorAll(".js-player-select"),
      gameboard                 = document.querySelector("#gameboard");

document.getElementById("reset").addEventListener("click", reset);
/* Initialise app */
initialize();
/* * * * * 
 * Logic *
 * * * * */
function initialize() {
    /* Create the gameboard and tiles */
    var tiles = Array(9).fill();
    var player_turn = 1,
      player_mark_O = [],
      player_mark_X = [];
    // Initialise button styles
    player_button_container.setAttribute("style", "display: inline-block, opacity: 1;");
    // opponent_button_container.style.display = "none";
    /* CREATE AI
    => maybe there could be a ranking based on whether the computer checkmark is within the winner array
       1. SCENARIO with computer X starting:
       - X picks tile 6 (i.e) gameboard[6], then the winning arrays include the following indexes: winners[2], winners[3], winners[5].
       - I put an O in tile 4 (i.e) gameboard[4].
       - Now the computer cannot use winners[5] but the following are still available: winners[2], winners[3].
       - Computer X now chooses winners[2] and randomly picks tile 7 or 8 within that array using Math.random()
       - I select tile 8, making winners[2] and winners[5] impossible and only winners[3] left.
       - Computer select tile 3 or tile 0 from winners[3] 
       - If I block him now, it's basically a tied game at best, Math.random() all available tiles to finish the game.
       
         |   |
       0 | 1 | 2   winners = [0,1,2], [3,4,5], [6,7,8], [0,3,6], [1,4,7], [2,5,8], [0,4,8], [6,4,2] 
      ___|___|___
         |   |  
       3 | 4 | 5
      ___|___|___
         |   | 
       6 | 7 | 8
         |   |    
    */
    /* 
     * Setup classes and append to div forEach tile
     */
  function markTiles(that, player, opponent, array, index) {
    that.dataset.check = player;
    that.classList.remove("active-tile");
    that.classList.add("inactive-tile");
    player_mark = opponent;
    array.push(index);
    // Check which tile was clicked to compae with winning tiles 
    console.log(`PLAYER X: ${array}`);
  }
  
  function markRandomTiles(that, AI, array) {
    player_turn++;
    that.dataset.check = AI;
    that.classList.remove("active-tile");
    that.classList.add("inactive-tile");
    console.log("a");
    console.log(array);
    console.log("b");
    console.log(array.length);
    array.push(1);
    console.log(array);
    console.log("c");
  }

    tiles.forEach((tile, i, arr) => {
      tile = document.createElement("div")
      tile.setAttribute("class", "tile checked active-tile");
      
      // Add each tile to the gameboard
      gameboard.appendChild(tile);
      // Add X's and O's
      tile.addEventListener("click", function() {
        // Increment player_turn to see what round we are up to    
        player_turn++;
        if (opponent === "HUMAN") {
          // Alternate between X & O
           (player_mark === "X") 
             ? markTiles(this, "X", "O", player_mark_X, i) 
             : markTiles(this, "O", "X", player_mark_O, i); 
        } // END human V human if statement
        /* Begin Human V Computer Battle */
        else if (opponent === "AI") {
            if (player_mark === "X")  {
              
              markTiles(this, "X", "O", player_mark_X, i);
              
              var activeTiles = document.querySelectorAll(".active-tile"),
                  randomTile = activeTiles[Math.floor(Math.random() * activeTiles.length)];
               console.log(activeTiles);
               markRandomTiles(randomTile, "O", player_mark_O);
               //player_mark_O.push(randomTile);
              console.log(player_mark_O);
              // player_mark_O.push(randomTile);
              // console.log(player_mark_O.push(randomTile));
              player_mark = "X";
            
            
            } else {
             
             markTiles(this, "O", "X", player_mark_X, i);
              
             
               markRandomTiles(randomTile, "X", player_mark_X);
              player_mark = "O";
           }
        } 
        
        /* 
         * Find a winning match
         */
        winners.forEach((winner) => {
          // Check winner array against player array
          function sort_winner(winner, player) {
            return winner.every((el) => {
              return player.indexOf(el) !== -1;
            });
          }
          
          // Alert the correct winner
          function alert_winner(player) {
            swal({
              title: `PLAYER ${player} WINS`,
              type: 'success',
            });
            reset();
          }
          
          // If a match is found alert and restart
          if (sort_winner(winner, player_mark_O)) {
            alert_winner("O");
          } else if (sort_winner(winner, player_mark_X)) {
            alert_winner("X");
          }
          
        });
        // TIE game & restart when all boxes are full
        player_turn === 10 && reset();
        
      }); // Close tile event listeners 
    }); // Close tiles forEach function
  } // Close initialize function


  /* 
   * Fade out buttons
   */
function fadeOut(element) {
  var opacity = 1,
    speed = 18;
  // decrease opacity over time
  function decrease() {
    opacity -= 0.05;
    if (opacity <= 0) {
      //reveal opponent button
      opponent_button_container.setAttribute("style", "display: block; opacity: 1;");
      // compvare fadOut for both buttons
      element.style.display = "none";
      return true;
    }
    element.style.opacity = opacity;
    setTimeout(decrease, speed);
  }
  decrease();
}

  /* * * * * * * * * * 
   * Player buttons  *
   * * * * * * * * * */
function player_and_opponent(el, selection, container) {
  return el.forEach((item) => {
    item.addEventListener("click", function() {
      // set global variables (yes, i know this is sketchy :\ )
      window[selection] = item.value;
      fadeOut(container);
    });
  });
}

// Call player buttons
player_and_opponent(player_buttons, "player_mark", player_button_container);
player_and_opponent(opponent_buttons, "opponent", opponent_button_container);
console.log("testing", player_mark);

/* Reset the game by removing & replacing tiles */
function reset() {
  // Reinitialize, however this creates 2 boards => see remove_tiles hack below.
  initialize();
  remove_tiles('tile');
  // Remove excess tiles to ensure 9 will always show
  function remove_tiles(className) {
    var elements = document.getElementsByClassName(className);
    while (elements.length > 9) {
      elements[0].parentNode.removeChild(elements[0]);
    }
  }
} // Close reset function

            
          
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