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HTML 

              
                <h2>React Color Picker 3</h2>
<div id="color-picker-container"></div>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Open+Sans);
body {
  margin: 0;
  padding: 0;
  background-color: #e6e6e6;
}
h2 {
  background-color: #dbdbdb;
  margin: 0;
  margin-bottom: 15px;
  padding: 10px;
  font-family: 'Open Sans';
}
#color-label {
  margin-left: 15px;
  position: relative;
  height: 20px;
  width: 40px;
  border: none;
}
#color-select {
  position: relative;
  left: 60px; 
  top: -22px;
  background-color: white;
  border: solid 1px #ccc;
  padding: 5px;
  height: 200px;
  width: 175px;
  opacity: 0;
  transition: all 0.3s;
}
canvas:hover {
  cursor: crosshair;
}
#color-strip {
  margin-left: 5px;
}
p {
  margin: 20px 0 0 70px;
}
!

JS 

              
                var contexts = [];
var wB = 150;
var hB = 150;
var wS = 20;
var hS = 150;
var drag = false;
var rgbColor = 'rgb(0,0,0)';

var ColorPickerContainer = React.createClass({
  getInitialState: function() {
    return {
      isPickerVisible: true,
      color: rgbColor
    };
  },
  togglePicker: function(id) {
    this.setState({isPickerVisible: !this.state.isPickerVisible});
  },
  blockFill: function() {
    this.ctxB.rect(0, 0, wB, hB);
    this.gradientBlock();
  },
  stripFill: function() {
    this.ctxS.rect(0, 0, wS, hS);
    var grd1 = this.ctxS.createLinearGradient(0, 0, 0, hS);
    grd1.addColorStop(0, 'rgb(255, 0, 0)'); // red
    grd1.addColorStop(0.17, 'rgb(255, 255, 0)'); // yellow
    grd1.addColorStop(0.34, 'rgb(0, 255, 0)'); // green
    grd1.addColorStop(0.51, 'rgb(0, 255, 255)'); // aqua
    grd1.addColorStop(0.68, 'rgb(0, 0, 255)'); // blue
    grd1.addColorStop(0.85, 'rgb(255, 0, 255)'); // magenta
    grd1.addColorStop(1, 'rgb(255, 0, 0)'); // red
    this.ctxS.fillStyle = grd1;
    this.ctxS.fill();
  },
  gradientBlock: function() {
    this.ctxB.fillStyle = rgbColor;
    this.ctxB.fillRect(0, 0, wB, hB);
    var grdWhite = this.ctxB.createLinearGradient(0, 0, wB, 0);
    grdWhite.addColorStop(0, 'rgb(255,255,255)');
    grdWhite.addColorStop(1, 'transparent');
    this.ctxB.fillStyle = grdWhite;
    this.ctxB.fillRect(0, 0, wB, hB);
    var grdBlack = this.ctxB.createLinearGradient(0, 0, 0, hB);
    grdBlack.addColorStop(0, 'transparent');
    grdBlack.addColorStop(1, 'rgb(0,0,0)');
    this.ctxB.fillStyle = grdBlack;
    this.ctxB.fillRect(0, 0, wB, hB);
  },
  selectColor: function(ctx, e, self) {
    var x = e.nativeEvent.offsetX;
    var y = e.nativeEvent.offsetY;
    var imageData = ctx.getImageData(x, y, 1, 1).data;
    rgbColor = 'rgb(' + imageData[0] + ',' + imageData[1] + ',' + imageData[2] + ')';
    self.setState({color: rgbColor});
  },
  selectColorSquare: function (color, self) {
    rgbColor = color;
    self.setState({color: rgbColor});
  },
  clickStrip: function (e) {
    var color = e.target.style.backgroundColor;
    color ? this.selectColorSquare(color, this) : this.selectColor(this.ctxS, e, this);
    this.gradientBlock(); 
  },
  mouseDownBlock: function(e) {
    drag = true;
    this.selectColor(this.ctxB, e, this);
  },
  mouseMoveBlock: function(e) {
    if (drag) {
      this.selectColor(this.ctxB, e, this);
    }
  },
  mouseUpBlock: function() {
    drag = false;
  },
  setContexts: function(ctxB, ctxS) {
    this.ctxB = ctxB;
    this.ctxS = ctxS;
  },
  render: function() {
    return (
      <div>
        <ColorLabel isChecked={this.state.isPickerVisible} 
                    color={this.state.color} 
                    handleClick={this.togglePicker}
                    id={this.props.id} />
        <ColorPicker isVisible={this.state.isPickerVisible} 
                     color={this.state.color} 
                     setContexts={this.setContexts}
                     mouseDownBlock={this.mouseDownBlock} 
                     mouseMoveBlock={this.mouseMoveBlock} 
                     mouseUpBlock={this.mouseUpBlock} 
                     clickStrip={this.clickStrip}
                     blockFill={this.blockFill}
                     stripFill={this.stripFill}
                     id={this.props.id} />
      </div>
    );
  }
});

var ColorPicker = React.createClass({
  getInitialState: function() {
    return {
      color: rgbColor
    }
  },
  componentDidMount: function() {
    var self = this;
    var canvasB = this.refs.canvasBlock;
    var canvasS = this.refs.canvasStrip;
    var ctxB = canvasB.getContext('2d');
    var ctxS = canvasS.getContext('2d');
    contexts.push(ctxB, ctxS);    
    self.props.setContexts(ctxB, ctxS);    
    contexts.forEach(function(item) {
      self.props.blockFill(item);
      self.props.stripFill(item);
    });
  },
  render: function(e) {
    var styles = {
      opacity: this.props.isVisible ? '1' : '0'
    };
    return (
      <div id="color-select" style={styles}>
        <div id="color-picker" className={this.props.id}>
          <canvas id="color-block" 
                  height={hB} 
                  width={wB} 
                  onMouseDown={this.props.mouseDownBlock}
                  onMouseMove={this.props.mouseMoveBlock}
                  onMouseUp={this.props.mouseUpBlock}
                  ref="canvasBlock"></canvas>
          <canvas id="color-strip" 
                  height={hS} 
                  width={wS} 
                  onClick={this.props.clickStrip}
                  ref="canvasStrip"></canvas>
        </div>
        <ColorTable handleClick={this.props.clickStrip} />
      </div>
    );
  }
});

var ColorTable = React.createClass({
  render: function () {
    var self = this;
    var colors = [
      'rgb(255, 65, 54)', // Red   
      'rgb(255, 133, 27)', // Orange 
      'rgb(255, 220, 0)', // Yellow  
      'rgb(1, 255, 112)', // Lime
      'rgb(46, 204, 64)', // Green
      'rgb(57, 204, 204)', // Teal
      'rgb(127, 219, 255)', // Aqua
      'rgb(0, 116, 217)', // Blue
      'rgb(177, 13, 201)', // Purple
      'rgb(240, 18, 190)', // Magenta
      'rgb(133, 20, 75)', // Maroon
      'rgb(17, 17, 17)', // Black
      'rgb(170, 170, 170)', // Gray
      'rgb(255, 255, 255)'  // White
    ];
    var styles = {
      position: 'relative',
      height: '50px',
      width: '175px',
      marginLeft: '2px'
    };
    return (
      <div id="color-table" style={styles}>
        {colors.map(function(color) {
          var style = {
            backgroundColor: color,
            border: 'solid 1px #ccc',
            height: '20px',
            width: '20px',
            marginRight: '3px',
            display: 'inline-block'
          };
          return <div style={style} onClick={self.props.handleClick}></div>
        })}
      </div>
    );
  }
});

var ColorLabel = React.createClass({
  handleClick: function() {
    this.props.handleClick();
  },
  render: function() {
    var styles = {
      backgroundColor: this.props.color
    };
    return(
      <div>
        <button type='button' id='color-label' className={this.props.id} style={styles} onClick={this.props.handleClick.bind(this, this.props.id)}  />
      </div>
    ); 
  }
});

var App = React.createClass({
  render: function() {
    return <ColorPickerContainer />
  }
});

React.render(
  <App />,
  document.getElementById('color-picker-container')
);
!
999px

Console