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HTML

              
                <div id="app">
  <div>
    <div id="container" class="container" @mouseup="selectEnd" @mouseleave="selectEnd" @mousemove="dragPicker">
        <p class="title">Big Color Picker</p>
        <div class="inner">
            <div class="colorpicker-wrap">
                <div id="color-area" class="colorpicker" @mousedown="colorSelect" :style="pickerStyle">
                    <div :style="{left:colorCursor.left + 'px',top:colorCursor.top + 'px'}" class="colorpicker-cursor" :class="colorCursorState"></div>
                </div>
            </div>
            <div id="huepicker" class="huepicker" @mousedown="hueSelectStart">
                <div @mousedown="hueCursorClick" class="huepicker-cursor" :style="{top:hueCursorPos + 'px'}"></div>
            </div>
            <div class="preview_area">
                <div class="preview-wrap">
                    <div class="preview" :style="{backgroundColor:'#' + rgb2hex,opacity:alpha}"></div>
                </div>
                <div class="colorcode-wrap">
                    <div class="colorcode-boxes-wrap">
                        <div class="colorcode-boxes">
                            <div class="colorcode-box">
                                <span>R</span><input type="text" :value="rgb.r" @keydown="colorNumInput('r', arguments[0])" @blur="colorNumInput('r', arguments[0])">
                            </div>
                            <div class="colorcode-box">
                                <span>G</span><input type="text" :value="rgb.g" @keydown="colorNumInput('g', arguments[0])" @blur="colorNumInput('g', arguments[0])">
                            </div>
                            <div class="colorcode-box">
                                <span>B</span><input type="text" :value="rgb.b" @keydown="colorNumInput('b', arguments[0])" @blur="colorNumInput('b', arguments[0])">
                            </div>
                            <div class="colorcode-box">
                                <span>A</span><input type="text" :value="alphaInt" @keydown="colorNumInput('a', arguments[0])" @blur="colorNumInput('a', arguments[0])">
                            </div>
                        </div>
                        <div class="colorcode-boxes">
                            <div class="colorcode-box">
                                <span>H</span><input type="text" :value="hsv.h" @keydown="colorNumInput('h', arguments[0])" @blur="colorNumInput('h', arguments[0])">
                            </div>
                            <div class="colorcode-box">
                                <span>S</span><input type="text" :value="hsv.s" @keydown="colorNumInput('s', arguments[0])" @blur="colorNumInput('s', arguments[0])">
                            </div>
                            <div class="colorcode-box">
                                <span>V</span><input type="text" :value="hsv.v" @keydown="colorNumInput('v', arguments[0])" @blur="colorNumInput('v', arguments[0])">
                            </div>
                        </div>
                    </div>
                    <input type="text" class="colorcode-rgba" :value="rgbaCode" @blur="rgbaCodeInput" @keyup.13="rgbaCodeInput" @focus="focusAndSelect">
                    <input type="text" class="colorcode-hex" :value="'#' + rgb2hex" @blur="hexInput" @keyup.13="hexInput" @focus="focusAndSelect">
                </div>
            </div>
        </div>
    </div>
</div>
</div>
              
            
!

CSS

              
                .container {
    position: absolute;
    width: 710px;
    top: 20px;
    left: 20px;
    padding: 0px 13px 35px 35px;
    text-align: center;
    border-radius: 12px 12px 5px 5px;
    background: rgb(53, 53, 53);
    box-shadow: rgba(0, 0, 0, 0.5) 0px 5px 30px,
      rgba(255,255,255,1) 0 1px 1px inset,
      rgba(0,0,0,0.3) 0 -2px 1px inset;

  }
  .title {
    display: inline-block;
    text-align: center;
    color: rgb(204, 204, 204);
    font-family: arial;
    padding-bottom: 3px;
    width: 100%;
    margin:14px 0;
  }
  .inner {
    display: flex;
    justify-content: space-between;
  }
  .colorpicker-wrap {
    background-color:#fff;
    background-image: linear-gradient(45deg, #ccc 25%, transparent 25%, transparent 75%, #ccc 75%, #ccc),
      linear-gradient(45deg, #ccc 25%, transparent 25%, transparent 75%, #ccc 75%, #ccc);
    background-position: 0 0, 12px 12px;
    background-size: 24px 24px;
  }
  .colorpicker {
    position: relative;
    overflow: hidden;
    width: 410px;
    height: 410px;
    background-color: rgb(255, 0, 0);
    background-image: linear-gradient(rgba(0, 0, 0, 0), rgb(0, 0, 0)), linear-gradient(to right, rgb(255, 255, 255), rgba(255, 255, 255, 0));
  }
  .colorpicker-cursor {
    pointer-events: none;
    position: absolute;
    width: 17px;
    height: 17px;
    left: 400px;
    top: -9px;
    box-sizing: border-box;
    background: linear-gradient(transparent 46%, white 46%, white 53%, transparent 53%), linear-gradient(90deg, transparent 47%, white 47%, white 53%, transparent 53%);
    border: 1px solid white;
    border-radius: 50%;
  }
  .colorpicker-cursor.black {
    border-color:black;
    background: linear-gradient(transparent 46%, black 46%, black 53%, transparent 53%), linear-gradient(90deg, transparent 47%, black 47%, black 53%, transparent 53%);
  }
  .huepicker {
    position: relative;
    width: 70px;
    height: 410px;
    background-image: linear-gradient(
      hsl(360,100%,50%),
      hsl(300,100%,50%),
      hsl(240,100%,50%),
      hsl(180,100%,50%),
      hsl(120,100%,50%),
      hsl(60,100%,50%),
      hsl(0,100%,50%)
    );
  }
  .huepicker-cursor {
    position: absolute;
    right: -13px;
    border-right: 10px solid rgb(255, 255, 255);
    border-top: 7px solid transparent;
    border-bottom: 7px solid transparent;
  }
  .preview-wrap {
    margin-right: 20px;
    margin-bottom: 20px;
    background-color:#fff;
    background-image: linear-gradient(45deg, #ccc 25%, transparent 25%, transparent 75%, #ccc 75%, #ccc),
      linear-gradient(45deg, #ccc 25%, transparent 25%, transparent 75%, #ccc 75%, #ccc);
    background-position: 0 0, 10px 10px;
    background-size: 20px 20px;
  }
  .preview {
    width: 150px;
    height: 120px;
    background: rgb(255, 0, 0);
  }
  .colorcode-wrap {
    color: rgb(255, 255, 255);
    font-size: 17px;
  }
  .colorcode-boxes-wrap {
    display: flex;
    flex-direction: row;
    justify-content: flex-start;
  }
  .colorcode-boxes {
    flex-basis: 41%;
    margin-right: 8px;
    margin-bottom: 15px;
  }
  input {
    border-radius: 2px;
    border: 1px solid #777;
    background: #555;
    color: #FFF;
  }
  .colorcode-box span {
    display: inline-block;
    width: 18px;
    font-size: 15px;
  }
  .colorcode-box input{
    display: inline-block;
    padding: 5px 7px;
    width: 28px;
    margin-bottom:10px;
    margin-left: 3px;
    font-size: 15px;

  }
  .colorcode-rgba {
    display: block;
    width: 136px;
    margin-bottom:15px;
    padding: 8px 5px;
    font-size: 13px;
  }
  .colorcode-hex {
    display: block;
    width: 136px;
    padding: 5px;
    font-size: 17px;
  }
              
            
!

JS

              
                new Vue({
  el: "#app",
  data: function() {
    return {
      rgb: {
        r: 255,
        g: 0,
        b: 0
      },
      hsv: {
        h: 360,
        s: 100,
        v: 100
      },
      alpha: 1,
      colorPickerSize: 410,
      hueChangeFlg: false,
      hueCursorClickFlg: false,
      hueCursorSize: 14,
      colorChangeFlg: false,
      colorCursorSize: 16,
      container: {
        left: 40,
        top: 40
      },
      mouseDownFlg: false
    };
  },
  methods: {
    //色相領域クリック
    hueSelectStart: function(event) {
      this.hueChangeFlg = true;
      var ajustY = 0;

      if (this.hueCursorClickFlg) {
        ajustY = this.hueCursorPos + this.hueCursorSize/2;
      }

      this.hsv.h = Math.round(
        Math.abs((event.offsetY + ajustY) * this.hueUnit - 360)
      );
      this.rgb = this.hsv2rgb;
    },
    //色相カーソルクリック
    hueCursorClick: function() {
      this.hueCursorClickFlg = true;
    },
    //カラーピッカークリック
    colorSelect: function(event) {
      this.colorChangeFlg = true;
      this.hsv.s = Math.round((event.offsetX) * this.colorUnit);
      this.hsv.v = Math.round(
        Math.abs((event.offsetY) * this.colorUnit - 100)
      );

      this.rgb = this.hsv2rgb;
    },
    //ドラッグ時
    dragPicker: function(event) {
      var cx = event.pageX;
      var cy = event.pageY - document.documentElement.scrollTop;

      var container = document.getElementById("container");
      var colorArea = document.getElementById("color-area");
      var conT = container.offsetTop;
      var conL = container.offsetLeft;

      //色相ドラッグ
      if (this.hueChangeFlg) {
        var hueArea = document.getElementById("huepicker");
        var ht = hueArea.offsetTop + conT;
        var hh = hueArea.clientHeight;

        var hueCursorPos = cy - ht;
        if (hueCursorPos < 0) {
          hueCursorPos = 0;
        } else if (hueCursorPos > hh) {
          hueCursorPos = hh;
        }

        this.hsv.h = Math.round(Math.abs(this.hueUnit * hueCursorPos - 360));
        this.rgb = this.hsv2rgb;
      }

      //カラーピッカードラッグ
      if (this.colorChangeFlg) {
        var ct = colorArea.offsetTop + conT;
        var cl = colorArea.offsetLeft + conL;
        var ch = colorArea.clientHeight;
        var cw = colorArea.clientWidth;

        var colorCursorPosY = cy - ct;
        if (colorCursorPosY < 0) {
          colorCursorPosY = 0;
        } else if (colorCursorPosY > ch) {
          colorCursorPosY = ch;
        }
        var colorCursorPosX = cx - cl;
        if (colorCursorPosX < 0) {
          colorCursorPosX = 0;
        } else if (colorCursorPosX > cw) {
          colorCursorPosX = cw;
        }
        this.hsv.s = Math.round(colorCursorPosX * this.colorUnit);
        this.hsv.v = Math.round(
          Math.abs(colorCursorPosY * this.colorUnit - 100)
        );
        this.rgb = this.hsv2rgb;
      }
    },
    //マウスアップで全フラグを解除
    selectEnd: function() {
      this.hueChangeFlg = false;
      this.colorChangeFlg = false;
      this.hueCursorClickFlg = false;
    },
    //16進数コード入力
    hexInput: function(event) {
      var hex = event.target.value;
      hex = hex.replace(/#/, "");
      if (!hex.match(/[A-Fa-f0-9]+/)) {
        return false;
      } else {
        if (hex.length != 6 && hex.length != 3) {
          return false;
        } else {
          if (hex.length == 3) {
            hex =
              hex.charAt(0) +
              hex.charAt(0) +
              hex.charAt(1) +
              hex.charAt(1) +
              hex.charAt(2) +
              hex.charAt(2);
          }
        }
      }
      this.rgb = this.hex2rgb(hex);
      this.hsv = this.rgb2hsv;
    },
    //RGBA HSB入力時
    colorNumInput: function(color, event) {
      if (event.type != "keydown" && event.type != "blur") {
        return false;
      } else {
        var val = event.target.value;
        if (!val.match(/\d+/)) {
          return false;
        }
        val = Number(val);

        if (event.type == "keydown") {
          if (
            event.key != "Enter" &&
            event.key != "ArrowUp" &&
            event.key != "ArrowDown" &&
            !event.shiftKey
          ) {
            return false;
          } else {
            var changeNum = 1;
            if (event.shiftKey) {
              changeNum = 10;
            }

            if (event.key == "ArrowUp") {
              val += changeNum;
            } else if (event.key == "ArrowDown") {
              val -= changeNum;
            }
          }
        }

        if (color == "r" || color == "b" || color == "g") {
          if (val > 255) {
            val = 255;
          } else if (val < 0) {
            val = 0;
          }
          if (color == "r") {
            this.rgb.r = val;
          } else if (color == "g") {
            this.rgb.g = val;
          } else if (color == "b") {
            this.rgb.b = val;
          }
          this.hsv = this.rgb2hsv;
        } else if (color == "a") {
          if (val > 100) {
            val = 100;
          } else if (val < 0) {
            val = 0;
          }
          this.alpha = (val / 100).toFixed(2);
        } else if (color == "h" || color == "s" || color == "v") {
          if (color == "h") {
            if (val > 360) {
              val = 360;
            } else if (val < 0) {
              val = 0;
            }
            this.hsv.h = val;
          } else if (color == "s") {
            if (val > 100) {
              val = 100;
            } else if (val < 0) {
              val = 0;
            }
            this.hsv.s = val;
          } else if (color == "v") {
            if (val > 100) {
              val = 100;
            } else if (val < 0) {
              val = 0;
            }
            this.hsv.v = val;
          }
          this.rgb = this.hsv2rgb;
        }
      }
    },
    //rgbaコード入力時
    rgbaCodeInput: function(event) {
      var rgbaCode = event.target.value;

      rgbaCode = rgbaCode.replace(/rgba?/, "");
      rgbaCode = rgbaCode.replace(/\(/, "");
      rgbaCode = rgbaCode.replace(/\)/, "");
      rgbaCode = rgbaCode.replace(/\ /, "");
      var rgbaCodeAry = rgbaCode.split(",");

      if (rgbaCodeAry.length < 3) {
        return false;
      } else {
        if (
          !rgbaCodeAry[0].match(/\d+/) ||
          !rgbaCodeAry[1].match(/\d+/) ||
          !rgbaCodeAry[2].match(/\d+/)
        ) {
          return false;
        }
      }

      this.rgb.r = rgbaCodeAry[0];
      this.rgb.g = rgbaCodeAry[1];
      this.rgb.b = rgbaCodeAry[2];
      this.alpha = rgbaCodeAry[3];
      this.hsv = this.rgb2hsv;
    },

    //テキストボックスフォーカス
    focusAndSelect: function(event) {
      event.target.select();
    },

    //16進数→RGB値
    hex2rgb: function(hex) {
      return {
        r: parseInt(hex.slice(0, 2), 16),
        g: parseInt(hex.slice(2, 4), 16),
        b: parseInt(hex.slice(4), 16)
      };
    }
  },
  computed: {
    rgbaCode: function() {
      var alpha = this.alpha;
      if (alpha == 1.0) {
        alpha = 1;
      } else if (alpha == 0.0) {
        alpha = 0;
      }
      return (
        "rgba(" +
        this.rgb.r +
        "," +
        this.rgb.g +
        "," +
        this.rgb.b +
        "," +
        alpha +
        ")"
      );
    },
    hueUnit: function() {
      return 360 / this.colorPickerSize;
    },
    hueCursorPos: function() {
      return Math.round(
        Math.abs(this.hsv.h - 360) / this.hueUnit - this.hueCursorSize / 2
      );
    },
    colorUnit: function() {
      return 100 / this.colorPickerSize;
    },
    colorCursor: function() {
      return {
        left: this.hsv.s / this.colorUnit - this.colorCursorSize / 2,
        top:
          Math.abs(this.hsv.v / this.colorUnit - this.colorPickerSize) -
          this.colorCursorSize / 2
      };
    },
    //カラーピッカーのカーソルの位置によって色を変える
    colorCursorState: function() {
      var color = "white";
      if (this.hsv.h <= 201 && this.hsv.h >= 22) {
        if (this.hsv.v >= 50) {
          color = "black";
        } else {
          color = "white";
        }
      } else {
        if (this.hsv.v >= 50 && this.hsv.s <= 71) {
          color = "black";
        } else {
          color = "white";
        }
      }
      return color;
    },
    alphaInt: function() {
      return Math.round(this.alpha * 100);
    },
    pickerStyle: function() {
      return {
        backgroundColor: "hsl(" + this.hsv.h + ",100%,50%)",
        opacity: this.alpha
      };
    },
    //RGB→16進数
    rgb2hex: function() {
      this.rgb.r = Math.round(this.rgb.r);
      this.rgb.g = Math.round(this.rgb.g);
      this.rgb.b = Math.round(this.rgb.b);
      return (
        ("00" + this.rgb.r.toString(16)).slice(-2) +
        ("00" + this.rgb.g.toString(16)).slice(-2) +
        ("00" + this.rgb.b.toString(16)).slice(-2)
      );
    },
    //RGB→HSV
    rgb2hsv: function() {
      var rr,
        gg,
        bb,
        r = this.rgb.r / 255,
        g = this.rgb.g / 255,
        b = this.rgb.b / 255,
        h,
        s,
        v = Math.max(r, g, b),
        diff = v - Math.min(r, g, b),
        diffc = function(c) {
          return (v - c) / 6 / diff + 1 / 2;
        };
      if (diff == 0) {
        h = s = 0;
      } else {
        s = diff / v;
        rr = diffc(r);
        gg = diffc(g);
        bb = diffc(b);

        if (r === v) {
          h = bb - gg;
        } else if (g === v) {
          h = 1 / 3 + rr - bb;
        } else if (b === v) {
          h = 2 / 3 + gg - rr;
        }
        if (h < 0) {
          h += 1;
        } else if (h > 1) {
          h -= 1;
        }
      }

      if (this.hsv.h == 360 && h == 0) {
        h = 1;
      }
      return {
        h: Math.round(h * 360),
        s: Math.round(s * 100),
        v: Math.round(v * 100)
      };
    },
    //HSV→RGB
    hsv2rgb: function() {
      var h = this.hsv.h;
      var s = this.hsv.s;
      var v = this.hsv.v;

      var max = v;
      var min = max - s / 255 * max;
      var rgb = { r: 0, g: 0, b: 0 };

      if (h == 360) {
        h = 0;
      }

      s = s / 100;
      v = v / 100;

      if (s == 0) {
        rgb.r = v * 255;
        rgb.g = v * 255;
        rgb.b = v * 255;
        return rgb;
      }

      var dh = Math.floor(h / 60);
      var p = v * (1 - s);
      var q = v * (1 - s * (h / 60 - dh));
      var t = v * (1 - s * (1 - (h / 60 - dh)));

      switch (dh) {
        case 0:
          rgb.r = v;
          rgb.g = t;
          rgb.b = p;
          break;
        case 1:
          rgb.r = q;
          rgb.g = v;
          rgb.b = p;
          break;
        case 2:
          rgb.r = p;
          rgb.g = v;
          rgb.b = t;
          break;
        case 3:
          rgb.r = p;
          rgb.g = q;
          rgb.b = v;
          break;
        case 4:
          rgb.r = t;
          rgb.g = p;
          rgb.b = v;
          break;
        case 5:
          rgb.r = v;
          rgb.g = p;
          rgb.b = q;
          break;
      }

      rgb.r = Math.round(rgb.r * 255);
      rgb.g = Math.round(rgb.g * 255);
      rgb.b = Math.round(rgb.b * 255);
      return rgb;
    }
  }
});

              
            
!
999px

Console