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              <h2>Minesweeper React</h2>

<h5>Based on the classic game, <a target="_new" href="http://en.wikipedia.org/wiki/Minesweeper_(video_game)">Minesweeper</a></h5>

<main id="app"></main>
            
          
!
            
              body, html
{
  padding: 1rem;  
}

#game-container {
  float: left;
  
  border: 1px solid #CCC;
  margin-bottom: 10px;
  padding: 15px;
}

.row
{
  display: flex;
}

.cell {
  width: 35px;
  height: 25px;
  border: 1px solid #CCC;
  padding: 10px 5px 5px 5px;

  background-color: #EEE;

  font-size: 16px;
  text-align: center;
  box-shadow: inset 5px 5px 10px #FFF, inset -3px -3px 5px #777;
  
  cursor: pointer;
  transition-property: background-color, box-shadow;
  transition-duration: 1s;
  transition-timing-function: ease-out;
}

.cell::selection {
  background: transparent;
}
.cell.revealed, .cell.flagged {
  cursor: default;
}
.cell.revealed {
  background-color: #DDD;
  -webkit-box-shadow: none;
  -moz-box-shadow: none;
  box-shadow: none;
}

$cellColors: (
  1: 'blue',
  2: 'green',
  3: 'red',
  4: 'purple',
  5: 'maroon',
  6: 'turquoise',
  7: 'black',
  8: 'white'
);

@each $name, $value in $cellColors {
  .cell.revealed.adj-#{$name} {
    color: #{$value};
  }
}

.cell.revealed.adj-M {
  font-family: "FontAwesome";
  background-color: #FFCCCC;
  
  &:after
  {
    content: '\f1e2';
  }
}

.cell.flagged {
  font-family: "FontAwesome";
  
  &:after
  {
    content: '\f024';
  }
}

.clearfix:after {
  visibility: hidden;
  display: block;
  content: "";
  clear: both;
  height: 0;
}

.status-msg {
  margin-bottom: 10px;
}

label {
  margin-right: 10px;
}

input[type="number"] {
  width: 70px;
  margin-right: 10px;
}

.m10 {
  margin: 10px 0;
}

.small-font
{
  font-size: .85rem;
}

            
          
!
            
              /*
	Minesweeper.js
	Author: Brian Glaz
	
	Desccription:
		React implementation of the classc game, Minesweeper	
*/

class GameContainer extends React.Component {
  constructor() {
    super();

    this.state = {
      grid: [], //will hold an array or cells
      minesFound: 0, //number of mines correctly flagged by user
      falseMines: 0, //number of mines incorrectly flagged
      minesRemaining: 10, //total number of mines - mines flagged
      statusMsg: "Playing...", //game status msg, 'Won','Lost', or 'Playing'
      statusMsgColor: "#000000", //status message font color
      playing: true,
      movesMade: 0, //keep track of the number of moves
      options: {
        rows: 8, //number of rows in the grid
        cols: 8, //number of columns in the grid
        mines: 10 //number of mines in the grid
      },
      userOptions: {
        rows: 8,
        cols: 8,
        mines: 10
      }
    };

    const methodsToBind = [
      "flagCell",
      "revealCell",
      "newGame",
      "validate",
      "handleMinMaxInputBlur",
      "gridToConsole"
    ];

    methodsToBind.forEach(
      methodName => (this[methodName] = this[methodName].bind(this))
    );

    //save initial state
    this.initialState = { ...this.state };

    if (!!localStorage["minesweeper-react"]) {
      this.loadFromLocal();
    } else {
      this.init(true);
    }
  }

  init(constructing = false) {
    const state = this.state,
      grid = Array.from(state.grid);

    //populate the grid with cells
    for (let r = 0; r < state.options["rows"]; r++) {
      grid.push([]);
      for (let c = 0; c < state.options["cols"]; c++) {
        grid[r].push({
          xpos: c,
          ypos: r,
          isMine: false,
          isRevealed: false,
          isFlagged: false,
          value: 0
        });
      }
    }

    //randomly assign mines
    if (state.options.mines > state.options.rows * state.options.cols) {
      state.options.mines = state.options.rows * state.options.cols;
    }

    let assignedMines = 0;
    while (assignedMines < state.options.mines) {
      let ypos = Math.floor(Math.random() * state.options.rows),
        xpos = Math.floor(Math.random() * state.options.cols),
        cell = grid[ypos][xpos];
      //assign and increment if cell is not already a mine
      if (!cell.isMine) {
        cell.isMine = true;
        cell.value = "M";
        assignedMines++;
      }
    }

    //update cell values, check for adjacent mines
    for (let ypos = 0; ypos < state.options["rows"]; ypos++) {
      for (let xpos = 0; xpos < state.options["cols"]; xpos++) {
        //no need to update mines
        if (!grid[ypos][xpos].isMine) {
          let mineCount = 0,
            adjCells = this.getAdjacentCells(xpos, ypos, grid);
          for (let i = adjCells.length; i--; ) {
            if (adjCells[i].isMine) {
              mineCount++;
            }
          }

          grid[ypos][xpos].value = mineCount;
        }
      }
    }
    if (constructing) {
      state.grid = grid;
    } else {
      this.setState({ grid });
    }
  }

  newGame() {
    const state = this.state,
      userOptions = state.userOptions, //grab a copy of user options from inputs
      newState = { ...this.initialState, userOptions, options: userOptions }; //apply user options on top of default options

    newState.minesRemaining = newState.options.mines;
    this.setState(newState, this.init);
  }

  getAdjacentCells(xpos, ypos, grid = []) {
    const state = this.state;
    let results = [];
    for (
      let rowPos = ypos > 0 ? -1 : 0;
      rowPos <= (ypos < state.options.rows - 1 ? 1 : 0);
      rowPos++
    ) {
      for (
        let colPos = xpos > 0 ? -1 : 0;
        colPos <= (xpos < state.options.cols - 1 ? 1 : 0);
        colPos++
      ) {
        results.push(Object.assign({}, grid[ypos + rowPos][xpos + colPos]));
      }
    }
    return results;
  }

  revealCell(xpos, ypos, moveCount = false) {
    const state = this.state,
      grid = Array.from(state.grid);

    let cell = grid[ypos][xpos];

    if (!cell.isRevealed && !cell.isFlagged && state.playing) {
      cell.isRevealed = true;

      //end the game if user clicked a mine
      if (cell.isMine) {
        this.setState({
          statusMsg: "Sorry, you lost!",
          playing: false,
          statusMsgColor: "#EE0000"
        });
      } else if (!cell.isFlagged && cell.value == 0) {
        //if the clicked cell has 0 adjacent mines, we need to recurse to reveal out all adjacent 0 cells
        const adjCells = this.getAdjacentCells(cell.xpos, cell.ypos, grid);
        for (let i = 0, len = adjCells.length; i < len; i++) {
          this.revealCell(adjCells[i].xpos, adjCells[i].ypos, grid);
        }
      }
      if (moveCount) {
        this.setState({ movesMade: state.movesMade + 1 });
      }

      this.setState({ grid });
    }
  }

  flagCell(xpos, ypos, e) {
    e.preventDefault();
    const state = this.state,
      grid = Array.from(state.grid);
    let cell = grid[ypos][xpos];

    if (!cell.isRevealed && state.playing) {
      if (!cell.isFlagged) {
        cell.isFlagged = true;
        this.setState({ minesRemaining: state.minesRemaining - 1 });
        if (cell.isMine) {
          this.setState({ minesFound: state.minesFound + 1 });
        } else {
          this.setState({ falseMines: state.falseMines + 1 });
        }
      } else {
        cell.isFlagged = false;
        this.setState({ minesRemaining: state.minesRemaining + 1 });
        if (cell.isMine) {
          this.setState({ minesFound: state.minesFound - 1 });
        } else {
          this.setState({ falseMines: state.falseMines + 1 });
        }
      }

      this.setState({ grid, movesMade: state.movesMade + 1 });
    }
  }

  validate() {
    const state = this.state;

    if (state.minesFound == state.options.mines && state.falseMines == 0) {
      this.setState({
        statusMsg: "You won!!",
        playing: false,
        statusMsgColor: "#00CC00"
      });
    } else {
      this.setState({
        statusMsg: "Sorry, you lost!",
        playing: false,
        statusMsgColor: "#EE0000"
      });
    }
  }

  handleMinMaxInputBlur(newStateObj = {}) {
    let newState = Object.assign({ ...this.state.userOptions }, newStateObj);
    this.setState({ userOptions: newState });
  }

  gridToConsole() {
    const state = this.state;
    let result = "";
    for (let r = 0, r_len = state.grid.length; r < r_len; r++) {
      for (let c = 0, c_len = state.grid[r].length; c < c_len; c++) {
        result += state.grid[r][c].value + " ";
      }
      result += "\n";
    }
    console.log(result);
  }

  saveToLocal(nextState) {
    const jsonData = JSON.stringify(nextState);
    localStorage["minesweeper-react"] = jsonData;
  }

  loadFromLocal() {
    this.state = JSON.parse(localStorage["minesweeper-react"]);
  }

  componentWillUpdate(nextProps, nextState) {
    this.saveToLocal(nextState);
  }

  render() {
    const state = this.state;

    return (
      <div>
        <section id="game-cotainer" className="clearfix">
          {state.grid.map((row, ypos) => {
            return (
              <div className="row" key={`row-${ypos}`}>
                {row.map((col, xpos) => {
                  const cell = state.grid[ypos][xpos];
                  return (
                    <Cell
                      key={`cell-${xpos}-${ypos}`}
                      value={cell.value}
                      isRevealed={cell.isRevealed}
                      isFlagged={cell.isFlagged}
                      isMine={cell.isMine}
                      xpos={cell.xpos}
                      ypos={cell.ypos}
                      onLeftClick={this.revealCell}
                      onRightClick={this.flagCell}
                    />
                  );
                })}
              </div>
            );
          })}
        </section>

        <div>
          <div className="m10">
            F = Flagged, M = Mine, Left Click to reveal a cell, Right Click to
            flag a cell
          </div>

          <div className="status-msg">
            <strong>Mines Remaining:</strong> {state.minesRemaining}
          </div>

          <div className="status-msg">
            <strong>Moves Made:</strong> {state.movesMade}
          </div>

          <div className="status-msg">
            <strong>Game Status:</strong>{" "}
            <span style={{ color: state.statusMsgColor }}>
              {state.statusMsg}
            </span>
          </div>

          <div className="m10">
            <input type="button" value="Did I win?" onClick={this.validate} />
          </div>

          <div className="m10">
            <label for="new_rows">Rows:</label>
            <MinMaxInput
              stateVal="rows"
              placeholder="rows"
              min="3"
              max="19"
              value={state.userOptions.rows}
              onBlur={this.handleMinMaxInputBlur}
            />
            <label for="new_cols">Cols:</label>
            <MinMaxInput
              stateVal="cols"
              placeholder="cols"
              min="3"
              max="19"
              value={state.userOptions.cols}
              onBlur={this.handleMinMaxInputBlur}
            />
            <label for="new_mines">Mines:</label>
            <MinMaxInput
              stateVal="mines"
              placeholder="mines"
              min="1"
              max={state.userOptions.cols * state.userOptions.rows}
              value={state.userOptions.mines}
              onBlur={this.handleMinMaxInputBlur}
            />
            <div className="small-font">*max size: 19 x 19</div>
            <input
              type="button"
              className="m10"
              value="Create new game!"
              onClick={this.newGame}
            />
          </div>

          <div>
            <input type="button" value="Cheat!" onClick={this.gridToConsole} />
            <div className="small-font">*grid layout printed to JS console</div>
          </div>
        </div>
      </div>
    );
  }
}

//Cell component representing individual cells on the game board
const Cell = props => {
  const {
    value,
    isRevealed,
    isFlagged,
    isMine,
    xpos,
    ypos,
    onLeftClick,
    onRightClick
  } = props;

  const getCssClasses = () => {
    return classNames("cell", `adj-${value}`, {
      revealed: isRevealed,
      flagged: isFlagged
    });
  };

  const handleClick = e => {
    onLeftClick(xpos, ypos, true);
  };

  const handleRightClick = e => {
    onRightClick(xpos, ypos, e);
  };

  return (
    <div
      className={getCssClasses()}
      onClick={handleClick}
      onContextMenu={handleRightClick}
    >
      {isRevealed && !isMine && value !== 0 ? value : ""}
    </div>
  );
};

//Helper input component to validate user inputted options
const MinMaxInput = props => {
  const { min, max, placeholder, stateVal, value, onBlur } = props;

  const handleBlur = e => {
    let val = parseInt(e.target.value);
    if (val < min) {
      val = min;
    } else if (val > max) {
      val = max;
    }

    e.target.value = val;

    let returnObj = {};
    returnObj[stateVal] = val;
    onBlur(returnObj);
  };

  return (
    <input
      type="number"
      placeholder={placeholder}
      defaultValue={value}
      min={min}
      max={max}
      onBlur={handleBlur}
    />
  );
};

ReactDOM.render(<GameContainer />, document.getElementById("app"));

            
          
!
999px
Loading ..................

Console