web前端 | 颜色选择器

参考：https://www.cnblogs.com/Grewer/p/8652078.html

代码：

<!DOCTYPE html>
<!-- saved from url=(0044)https://grewer.github.io/JsDemo/colorPicker/ -->
<html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    
    <title>colorPicker</title>
    <link rel="stylesheet" href="./colorPicker_files/colorPicker.css">
</head>
<body>
<div>
<div id="chooseColor" style="background-color: rgb(255, 255, 255);"></div>
<div id="pickBox" style="display: none;">
    <div class="colorBox">
        <div class="color" style="background-color: rgb(255, 0, 0);">
            <div class="white"></div>
            <div class="black"></div>
            <div class="point" style="left: 0px; top: 0px;">
                <div class="p"></div>
            </div>
        </div>
        <div class="colorSelect">
            <div class="colorBar"></div>
            <div class="thumb bar"></div>
        </div>
    </div>
    <div class="transparency" style="background-color: rgb(255, 255, 255);">
        <div class="transparencyBar"></div>
        <div class="thumb trans"></div>
    </div>
    <div class="operate">
        <input autocomplete="off" class="rgbaText" type="text" value="rgba(255,255,255,1)">
        <button id="confirm">确认</button>
    </div>
</div>
</div>

<script src="./colorPicker_files/index.js"></script>
</body></html>

#pickBox {
    width: 300px;
    height: 200px;
    border: 1px solid #ddd;
    border-radius: 3px;
    box-shadow: 0 2px 12px 0 rgba(0, 0, 0, .1);
    background-color: #fff;
    padding: 6px;
    position: absolute;
}

.transparency {
    position: relative;
    width: 280px;
    height: 12px;

}

.color {
    position: relative;
    width: 280px;
    height: 150px;
    float: left;
}

.color .white {
    background: linear-gradient(90deg, #fff, hsla(0, 0%, 100%, 0));
    position: absolute;
    width: 100%;
    height: 100%;
}

.color .black {
    background: linear-gradient(0deg, #000, transparent);
    position: absolute;
    width: 100%;
    height: 100%;
}

.colorSelect {
    width: 12px;
    height: 150px;
    float: right;
    position: relative;
    box-sizing: border-box;
}

.colorBar {
    background: linear-gradient(180deg, red 0, #ff0 17%, lime 33%, cyan 50%, blue 67%, #f0f 83%, red);
    height: 100%;
}

.colorBox {
    overflow: hidden;
    margin-bottom: 6px;
}

.colorSelect .thumb {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 4px;
    box-sizing: border-box;
    border-radius: 1px;
    background: #fff;
    border: 1px solid #f0f0f0;
    box-shadow: 0 0 2px rgba(0, 0, 0, .6);
    z-index: 1;
}

.transparency .thumb {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 4px;
    box-sizing: border-box;
    border-radius: 1px;
    background: #fff;
    border: 1px solid #f0f0f0;
    box-shadow: 0 0 2px rgba(0, 0, 0, .6);
    z-index: 1;
}

.color .point {
    position: absolute;
}

.color .point > div {
    width: 4px;
    height: 4px;
    box-shadow: 0 0 0 1.5px #fff, inset 0 0 1px 1px rgba(0, 0, 0, .3), 0 0 1px 2px rgba(0, 0, 0, .4);
    border-radius: 50%;
    transform: translate(-2px, -2px);
}

.transparency .transparencyBar {
    background: linear-gradient(90deg, hsla(0, 0%, 100%, 0) 0, #fff);
    height: 100%;
}

.operate input {
    float: left;
    font-size: 12px;
    height: 24px;
    margin: 0;
    box-sizing: border-box;
    outline: 0;
}

.operate {
    margin-top: 6px;
    text-align: right;
}

#pickBox button {
        margin: 0;
    font-size: 12px;
    line-height: 0;
    background-color: #fff;
    color: #333;
    border: 1px solid #ddd;
    border-radius: 3px;
    cursor: pointer;
    outline: 0;
    width: 80px;
    text-align: center;
    -webkit-appearance: none;
    transition: .3s;
}

#pickBox button:hover {
    border-color: #51bbdd;
    color: #51bbdd;
}

#pickBox button:focus {
    border-color: #2c9edd;
    color: #2c9edd;
}

.operate button {
    height: 24px;
}

#chooseColor {
    width: 30px;
    height: 30px;
    border: 1px solid #999;
    margin: 5px;
    cursor: pointer;
}

var pick, colorElement, chooseColor, colorPoint, colorBar, rgbaText, colorBarThumb, transparency, transparencyBar, transparencyThumb;
chooseColor = document.getElementById('chooseColor');
//color长宽
var colorWidth, colorHeight, transparencyBarWidth;
var pickBoxOffsetTop, pickBoxOffsetLeft;
var init = function () {
    pick = document.getElementById('pickBox');
    colorElement = pick.querySelector('.color');
    colorPoint = pick.querySelector('.point');
    colorBar = pick.querySelector('.colorBar');
    rgbaText = pick.querySelector('.rgbaText');
    colorBarThumb = pick.querySelector('.bar.thumb');
    transparency = pick.querySelector('.transparency');
    transparencyBar = pick.querySelector('.transparencyBar');
    transparencyThumb = pick.querySelector('.transparency .thumb');
    //color长宽
    colorWidth = colorElement.clientWidth;
    colorHeight = colorElement.clientHeight;
    transparencyBarWidth = transparencyBar.clientWidth;
    pickBoxOffsetTop = pick.getBoundingClientRect().top;
    pickBoxOffsetLeft = pick.getBoundingClientRect().left;
};
init();
var isMoveColor = false;
var isMoveColorBar = false;
var isMoveTransparency = false;
var transparencyCache = 1;
var changeColor = function (x, y) {
    if (x === void 0) { x = 0; }
    if (y === void 0) { y = 0; }
    var _a = rgbToObj(colorElement.style.backgroundColor), r = _a.r, g = _a.g, b = _a.b;
    //右上 RGB;
    var difference = {
        r: 255 - r,
        g: 255 - g,
        b: 255 - b
    };
    var scaleX = x / colorWidth;
    scaleChange(difference, scaleX);
    var result = {
        r: 255 - difference.r,
        g: 255 - difference.g,
        b: 255 - difference.b
    };
    var scaleY = y / colorHeight;
    scaleChange(result, 1 - scaleY);
    var RGBA = objToRGBA(result);
    chooseColor.style.backgroundColor = RGBA;
    rgbaText.value = RGBA;
    transparency.style.backgroundColor = objToRGB(result);
};
var scaleChange = function (diff, scale) {
    for (var i in diff) {
        diff[i] = (scale * diff[i]) | 0;
    }
};
var pxToNumber = function (px) {
    if (px === void 0) { px = '0px'; }
    return Number(px.slice(0, -2));
};
var objToRGBA = function (obj) {
    return "rgba(" + obj.r + "," + obj.g + "," + obj.b + "," + transparencyCache + ")";
};
var objToRGB = function (obj) {
    return "rgb(" + obj.r + "," + obj.g + "," + obj.b + ")";
};
var rgbToObj = function (rgbString) {
    var array = rgbString.split(',');
    return { r: Number(array[0].split('(')[1]), g: Number(array[1]), b: Number(array[2].slice(0, -1)) };
};
var colorBarRange = function (scale) {
    switch (true) {
        case scale < .17:
            return { rank: scale / .17, arr: [{ r: 255, g: 0, b: 0 }, { r: 255, g: 255, b: 0 }] };
        case scale < .33:
            return { rank: (scale - .17) / .16, arr: [{ r: 255, g: 255, b: 0 }, { r: 0, g: 255, b: 0 }] };
        case scale < .5:
            return { rank: (scale - .33) / .17, arr: [{ r: 0, g: 255, b: 0 }, { r: 0, g: 255, b: 255 }] };
        case scale < .67:
            return { rank: (scale - .5) / .17, arr: [{ r: 0, g: 255, b: 255 }, { r: 0, g: 0, b: 255 }] };
        case scale < .83:
            return { rank: (scale - .67) / .16, arr: [{ r: 0, g: 0, b: 255 }, { r: 255, g: 0, b: 255 }] };
        default:
            return { rank: (scale - .83) / .17, arr: [{ r: 255, g: 0, b: 255 }, { r: 255, g: 0, b: 0 }] };
    }
};
var getTransparency = function (rank) {
    return Number((1 - rank / transparencyBarWidth).toFixed(2));
};
var changeColorBar = function (scale) {
    var range = colorBarRange(scale);
    var rangeArr = range.arr;
    var diff = {
        r: rangeArr[0].r - rangeArr[1].r,
        g: rangeArr[0].g - rangeArr[1].g,
        b: rangeArr[0].b - rangeArr[1].b
    };
    var result = rangeArr[1];
    for (var i in diff) {
        result[i] = result[i] + diff[i] * (1 - range.rank) | 0;
    }
    return result;
};
var changeTransparency = function (x) {
    var transparency = getTransparency(x);
    transparencyThumb.style.left = x + 'px';
    transparencyCache = transparency;
    var currentColor = rgbaText.value.split(',');
    currentColor.splice(currentColor.length - 1, 1, transparency + ')');
    var changeTransparencyColor = currentColor.join(',');
    rgbaText.value = changeTransparencyColor;
    chooseColor.style.backgroundColor = changeTransparencyColor;
};
pick.addEventListener('mousedown', function (ev) {
    var target = ev.target;
    switch (target.className) {
        case 'p':
            return isMoveColor = true;
        case 'point':
            return isMoveColor = true;
        case 'thumb bar':
            return isMoveColorBar = true;
        case 'thumb trans':
            return isMoveTransparency = true;
    }
}, false);
pick.addEventListener('click', function (ev) {
    var target = ev.target;
    var x = ev.offsetX, y = ev.offsetY;
    switch (target.className) {
        case 'colorBar':
            colorBarThumb.style.top = y + 'px';
            var result = changeColorBar(y / colorHeight);
            colorElement.style.backgroundColor = objToRGB(result);
            return changeColor(pxToNumber(colorPoint.style.left), pxToNumber(colorPoint.style.top));
        case 'black':
            colorPoint.style.left = x + 'px';
            colorPoint.style.top = y + 'px';
            return changeColor(x, y);
        case 'transparencyBar':
            return changeTransparency(x);
    }
}, false);
document.addEventListener('mousemove', function (ev) {
    var target = ev.target;
    var cx = ev.clientX + document.documentElement.scrollLeft || window.pageXOffset || document.body.scrollLeft, cy = ev.clientY + document.documentElement.scrollTop || window.pageYOffset || document.body.scrollTop;
    switch (true) {
        case isMoveTransparency:
            if (target.className !== 'thumb trans') {
                var diffX = cx - pickBoxOffsetLeft - 7;
                if (diffX < 0)
                    diffX = 0;
                if (diffX > transparencyBarWidth)
                    diffX = transparencyBarWidth;
                changeTransparency(diffX);
            }
            return false;
        case isMoveColorBar:
            if (target.className !== 'thumb bar') {
                var diffY = cy - pickBoxOffsetTop - 7;
                if (diffY < 0)
                    diffY = 0;
                if (diffY > colorHeight)
                    diffY = colorHeight;
                colorBarThumb.style.top = diffY + 'px';
                var result = changeColorBar(diffY / colorHeight);
                colorElement.style.backgroundColor = objToRGB(result);
                changeColor(pxToNumber(colorPoint.style.left), pxToNumber(colorPoint.style.top));
            }
            return false;
        case isMoveColor:
            if (target.className !== 'p' && target.className !== 'point') {
                var diffX = cx - pickBoxOffsetLeft - 7, diffY = cy - pickBoxOffsetTop - 7;
                if (diffX < 0)
                    diffX = 0;
                if (diffY < 0)
                    diffY = 0;
                if (diffX > colorWidth)
                    diffX = colorWidth;
                if (diffY > colorHeight)
                    diffY = colorHeight;
                changeColor(diffX, diffY);
                colorPoint.style.left = diffX + 'px';
                colorPoint.style.top = diffY + 'px';
            }
            return false;
    }
}, false);
chooseColor.addEventListener('click', function () {
    pick.style.display = 'block';
    init();
}, false);
document.getElementById('confirm').addEventListener('click', function () {
    pick.style.display = 'none';
});
document.addEventListener('mouseup', function () {
    isMoveColor = false;
    isMoveColorBar = false;
    isMoveTransparency = false;
}, false);
//# sourceMappingURL=index.js.map

posted @ 2022-03-06 12:59 Mz1 阅读(269) 评论(0) 编辑收藏举报

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web前端 | 颜色选择器

web前端 | 颜色选择器

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