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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: 15.1em;
}
.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;
}

.ai {
  color: firebrick;
}

/* 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 letiables
let opponent,
    currentPlayer;
/* Set winning tiles */
const 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]
];
const opponentButtonDiv = document.getElementById("opponent-select-container"),
        opponentButtons = document.querySelectorAll(".opponent"),
        playerButtonDiv = document.getElementById("player-select-container"),
          playerButtons = 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 */
  const tiles = Array(9).fill();
  let turnCounter = 1,
    Ocoords = [],
    Xcoords = [];
  
  
  // Initialise button styles
  playerButtonDiv.setAttribute("style", "display: inline-block, opacity: 1;");
  /* 
   * 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");
    currentPlayer = opponent;
    array.push(index);
    // Check which tile was clicked to compae with winning tiles 
    console.log(`currentPlayer: ${array}`);
  }


  tiles.forEach((tile, i, arr) => {
    
    tile = document.createElement("div")
    tile.setAttribute("class", "tile checked active-tile");
    gameboard.appendChild(tile);
    
    
    // Add X's and O's
    tile.addEventListener("click", function(e) {
      // Increment turnCounter to see what round we are up to    
      turnCounter++;
      
      
      if (opponent === "HUMAN") {
        (currentPlayer === "X") 
          ? markTiles(tile, "X", "O", Xcoords, i)
          : markTiles(tile, "O", "X", Ocoords, i);
      } // END human V human if statement
      
      
      /* Begin Human V Computer Battle */
      if (opponent === "AI" && currentPlayer === "X") {
          
        markTiles(tile, "X", "O", Xcoords, i);

        let      aiTile = document.querySelectorAll(".ai"),
            activeTiles = document.querySelectorAll(".active-tile"),

            // random tile index is not registering in my comparison array

            randomTileIndex = Math.floor(Math.random() * activeTiles.length),
            randomTile = activeTiles[randomTileIndex];
            randomTile.classList.add("ai");


        markTiles(randomTile, "O", "X", Ocoords, randomTileIndex);
        // markRandomTiles( randomTile, "O", Ocoords, randomTileIndex );
      } else {
        
        markTiles(this, "O", "X", Xcoords, i);
        markRandomTiles(randomTile, "X", Xcoords);
        currentPlayer = "O";
        
      } // close AI functionality
      
      
      /* 
       * Find a winning match
       */
      winners.forEach((winner) => {
        // Check winner array against player array
        function filterWinner(winner, player) {
          return winner.every((el) => {
            return player.indexOf(el) !== -1;
          });
        }
        

        // Alert the correct winner
        function alertWinner(player) {
          swal({
            title: `PLAYER ${player} WINS`,
            type: 'success',
          });
          reset();
        }
        

        // If a match is found alert and restart
        if ( filterWinner( winner, Ocoords ) ) {
          alertWinner("O");
        } else if ( filterWinner( winner, Xcoords ) ) {
          alertWinner("X");
        }

      }); // close winners forEach loop
      
     
      // TIE game & restart when all boxes are full
      turnCounter >= 10 && reset();
      
      
    }); // Close tile event listeners 
  }); // Close tiles forEach function
} // Close initialize function


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


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


// Set player buttons and set currentPlayer, then fadeout
player_and_opponent(playerButtons, "currentPlayer", playerButtonDiv);
player_and_opponent(opponentButtons, "opponent", opponentButtonDiv);



/* Reset the game by removing & replacing tiles */
function reset() {
  initialize();
  remove_tiles('tile');
  
  // Remove excess tiles to ensure 9 will always show
  function remove_tiles(className) {
    let elements = document.getElementsByClassName(className);
    while (elements.length > 9) {
      elements[0].parentNode.removeChild(elements[0]);
    }
  } // end remove tile function
} // Close reset function
            
          
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