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HTML

              
                <div class='container-fluid'>
  <div class='row'>
    <div class='col-sm-5 text-center'>
      <table>
        <tr>
          <td>
            <a href='#'>
              <div id='1' class='tiles row1 col1 diag1'></div>
            </a>
          </td>
          <td>
            <a href='#'>
              <div id='2' class='tiles row1 col2'></div>
            </a>
          </td>
          <td>
            <a href='#'>
              <div id='3' class='tiles row1 col3 diag2'></div>
            </a>
          </td>
        </tr>
        <tr>
          <td>
            <a href='#'>
              <div id='4' class='tiles row2 col1'></div>
            </a>
          </td>
          <td>
            <a href='#'>
              <div id='5' class='tiles row2 col2 diag1 diag2'></div>
            </a>
          </td>
          <td>
            <a href='#'>
              <div id='6' class='tiles row2 col3'></div>
            </a>
          </td>
        </tr>
        <tr>
          <td>
            <a href='#'>
              <div id='7' class='tiles row3 col1 diag2'></div>
            </a>
          </td>
          <td>
            <a href='#'>
              <div id='8' class='tiles row3 col2'></div>
            </a>
          </td>
          <td>
            <a href='#'>
              <div id='9' class='tiles row3 col3 diag1'></div>
            </a>
          </td>
        </tr>
      </table>
      <h3 id='turn' class='text-center'></h3>
    </div>
    <div class='col-sm-1 text-center'></div>
    <div class='col-sm-6'>
      <div id='opponent'>
        <h1>Opponent</h1>
        <input type="checkbox" id='human' class='opp' checked>
        <p>Human</p>
        </input>
        <input type="checkbox" id='dumbAI' class='opp'>
        <p>Dumb AI</p>
        </input>
        <input type="checkbox" id='smartAI' class='opp'>
        <p>Smart AI</p>
        </input>
      </div>

      <div id='symbol'>
        <h1>Player 1</h1>
        <input type="checkbox" id='x' class='sym'>
        <p>X</p>
        </input>
        <input type="checkbox" id='o' class='sym'>
        <p>O</p>
        </input>
      </div>

      <div id='score'>
        <h1>Score</h1>
        <p>Player 1: <span id='p1Score'>0</span></p>
        <br>
        <p>Opponent: <span id='oppScore'>0</span></p>
        <br>
        <p>Ties: <span id='tie'>0</span></p>
      </div>

    </div>

  </div>
</div>
              
            
!

CSS

              
                body {
  background-color: #699864;
}

table {
  display: inline-block;
  margin-top: 20px;
}

.tiles {
  background-color: white;
  border: 5px solid #699864;
  text-align: center;
  width: 3cm;
  height: 3cm;
  font-size: 2cm;
}

p {
  font-size: 20px;
  display: inline-block;
}

input {
  display: inline-block;
  vertical-align: center;
  width: 10%;
  zoom: 2;
}

a, a:hover, a:active, a:visited {
  text-decoration: none !important;
  color: #699864;
  font-family: papyrus, sans-serif;
}
              
            
!

JS

              
                var xSymbol, turn, player1, moves = 0, player2 = 'human', rows = ['.row1','.row2','.row3','.col1','.col2','.col3','.diag1','.diag2'];
$(document).ready(function() {
  
  // if opponent changes, reset score, turn, and symbol
  $('.opp').click(function() {
    $('input.opp, input.sym').filter(':checked').not(this).removeAttr('checked');
    player2 = $(this).attr('id');
    $('span').html('0');
    $('#turn, .tiles').empty();
    xSymbol = null;
  })

  // determine first player & symbol
  $('.sym').click(function() {
    $('input.sym').filter(':checked').not(this).removeAttr('checked');
    xSymbol = $('#x').is(':checked') ? true : false;
    player1 = xSymbol ? 'X' : 'O';
    turn = player1;
    
    $('#turn').html(player1+"'s turn");
  })
  
  // when you click a tile
  $('.tiles').click(function() {
    
    // make a move
    if (xSymbol != null) {  
      if ($(this).is(':empty')) {
        $(this).html(turn); // place symbol if it's a valid space
        moves++; // update how many turns have been taken
        checkWinOrTie(); // self explanatory
        opponent(player2); // opponent move
      } // end of if the tile is empty
    } // end of make sure symbol is chosen
    
    // if X or O not selected
    else {
      alert('Please choose X or O');
    }  
  }); // end of click tile
}) // end of doc ready


function opponent(player2) {
  // change to comp symbol
  xSymbol = !xSymbol;
  turn = xSymbol ? 'X' : 'O';
  
  // just change whose turn it is
  if (player2 == 'human') {
    $('#turn').html(turn+"'s turn");
  }
  
  else if (player2 == 'dumbAI') {
    // check to see if 2 of comp symbol in a row
    comp = 0; i = -1; filled = 0;
    while (comp != 2 && i<rows.length) {
      comp = 0; filled = 0; i++;
      $(rows[i]).each(function() {
        if ($(this).html() == turn) {
          comp++; 
        }
        if (!$(this).is(':empty')) {
          filled++;
        }
        if (filled == 3) {
          comp = 0; filled = 0; i++;
        }
      })
    }
    // offensive - go for the win
    if (comp == 2 && filled != 3) {
      $(rows[i]).html(turn);
    }
    else {
      // find the empty spaces
      empty = [];
      $('.tiles').each(function() {
        if ($(this).is(':empty')) {
          empty.push(parseInt($(this).attr('id')));
        }
      });
      // make a random move
      $('#'+String(empty.randEl())).html(turn);
    }
    // update moves, check end game, change symbol back to human
    moves++;
    checkWinOrTie();
    xSymbol = !xSymbol;
    turn = xSymbol ? 'X' : 'O';
  }
  
  else if (player2 == 'smartAI') {
    // take the center if it's empty
    if ($('#5').is(':empty')) {
      $('#5').html(turn)
      centerTakenFirst = false;
    }
    else {
      if (moves == 1) {
        centerTakenFirst = true;
      }
      // check to see if 2 of comp symbol in a row
      comp = 0; i = -1; filled = 0;
      while (comp != 2 && i<rows.length) {
        comp = 0; filled = 0; i++;
        $(rows[i]).each(function() {
          if ($(this).html() == turn) {
            comp++; 
          }
          if (!$(this).is(':empty')) {
            filled++;
          }
          if (filled == 3) {
            comp = 0; filled = 0; i++;
          }
        })
      }
      // offensive - go for the win
      if (comp == 2 && filled != 3) {
        $(rows[i]).html(turn);
      } 
      
      // if comp can't win, see if it can block
      else {
        // change back to my symbol to check it
        xSymbol = !xSymbol;
        turn = xSymbol ? 'X' : 'O';
        
        // check to see if 2 in a row of mine
        mine = 0; i = -1; filled = 0;
        while (mine != 2 && i<rows.length) {
          mine = 0; filled = 0; i++;
          $(rows[i]).each(function() {
            if ($(this).html() == turn) {
              mine++; 
            }
            if (!$(this).is(':empty')) {
              filled++;
            }
            if (filled == 3) {
              mine = 0; filled = 0; i++;
            }
          })
        }
        // change back to comp symbol
        xSymbol = !xSymbol;
        turn = xSymbol ? 'X' : 'O';
        // block if it needs to
        if (mine == 2) {
          $(rows[i]).each(function() {
            if ($(this).is(':empty')) {
              $(this).html(turn);
            }
          })
        }
        
        // or play a random move
        else {
          // force a corner move if human took center
          if (centerTakenFirst) {
            empty = ['1','3','7','9'];
          }
          // otherwise, make a random move
          else {
            empty = [];
            $('.tiles').each(function() {
              if ($(this).is(':empty')) {
                empty.push(parseInt($(this).attr('id')));
              }
            });
          }
          $('#'+String(empty.randEl())).html(turn);
          centerTakenFirst = false;
        }
      }
    } // end of else
    moves++;
    checkWinOrTie();
    xSymbol = !xSymbol;
    turn = xSymbol ? 'X' : 'O';
  } // end of if smartAI 
} // end of opponent

function checkWinOrTie() {
  // check to see if you won
  rows.forEach(function(element) {
    win = 0;
    $(element).each(function() {
      if ($(this).html() == turn) {
        win ++;
      }
    })
    if (win == 3) {
      $(element).css('background-color','gray');
      alert(turn+' wins!');
      champ = (turn == player1) ? $('#p1Score') : $('#oppScore');
      champ.html(parseInt(champ.html())+1);
      $('.tiles').empty();
      $('.tiles').css('background-color','white');
      moves = 0;
    }
  })
        
    // or is it a tie
    if (moves == 9) {
      alert('Shucks, it\'s a tie.');
      $('.tiles').empty();
      $('#tie').html(parseInt($('#tie').html())+1);
      moves = 0;
    }
}

Array.prototype.randEl = function () {
    return this[Math.floor(Math.random() * this.length)]
}
              
            
!
999px

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