我在sample page的this library检查了色轮选择器。我想改变一些东西。在hsvDown at line 210的函数中，line of code将no-cursor的类添加到hsv_map。并在line 287他们删除了班级。
这里是.no-cursor的CSS：
.no-cursor .hsv-cursor, #hsv_map.no-cursor .cover {
cursor: none;
}
我想单独使用JavaScript来隐藏/显示光标，这意味着，无需添加/删除class。所以我尝试了以下几点：
JSFiddle的第220行：
hsv_mapCover.style.cursor = hsv_mapCursor.style.cursor = 'none';
JSFiddle轰鸣声中的第270行：
hsv_mapCover.style.cursor = hsv_mapCursor.style.cursor = 'crosshair';
当我运行代码时，光标始终存在。它并没有消失。我在开发工具中检查了它（在chrome中，通过点击F12），当你点击colorWheel时，会发生什么，.hsv-cursor删除了cursor属性。然后，当您取消选择（mouseUp事件）时，cursor属性将返回十字准线的类型，即正确的十字准线。
单击色轮时，我不希望删除cursor属性。我希望cursor为none。
为什么单击色轮时光标属性会被删除，如何在选择colorWheel时将cursor属性设为none？
;(function(window, undefined) {
"use strict"
// Some common use variables
var ColorPicker = window.ColorPicker,
Tools = ColorPicker || window.Tools, // provides functions like addEvent, ... getOrigin, etc.
colorSourceSelector = document.getElementById('description').getElementsByTagName('select')[0],
startPoint,
currentTarget,
currentTargetWidth = 0,
currentTargetHeight = 0;
/* ---------------------------------- */
/* ------- Render color patch ------- */
/* ---------------------------------- */
var testPatch = document.getElementById('testPatch'),
renderTestPatch = function(color) { // used in renderCallback of 'new ColorPicker'
var RGB = color.RND.rgb;
testPatch.style.cssText =
'background-color: rgba(' + RGB.r + ',' + RGB.g + ',' + RGB.b + ',' + color.alpha + ');' +
'color: ' + (color.rgbaMixBlack.luminance > 0.22 ? '#222' : '#ddd');
testPatch.firstChild.data = '#' + color.HEX;
};
/* ---------------------------------- */
/* ------ Render contrast patch ----- */
/* ---------------------------------- */
var contrastPatch = document.getElementById('contrastPatch'),
backGround = contrastPatch.firstChild,
renderContrastPatch = function(color) { // used in renderCallback of 'new ColorPicker'
var RGB = color.RND.rgb,
bgColor = color.background.RGB,
options = myColor.options ? myColor.options : myColor.color.options,
cBGColor = myColor ? options.customBG : {},
bgType,
alphaBG;
if (!cBGColor) {
// contrastPatch.style.display = 'none';
// return;
cBGColor = {
r: 1,
g: 1,
b: 1
};
}
alphaBG = options.alphaBG;
bgType = {
w: 'White',
b: 'Black',
c: 'Custom'
}[alphaBG];
cBGColor = alphaBG === 'b' ? {
r: 0,
g: 0,
b: 0
} : alphaBG === 'w' ? {
r: 1,
g: 1,
b: 1
} : cBGColor;
contrastPatch.style.cssText =
'background-color: rgb(' +
Math.round(cBGColor.r * 255) + ',' +
Math.round(cBGColor.g * 255) + ',' +
Math.round(cBGColor.b * 255) + ');' +
'color: ' + 'rgba(' + RGB.r + ',' + RGB.g + ',' + RGB.b + ',' + color.alpha + ');';
backGround.style.cssText =
'background-color: rgba(' +
bgColor.r + ',' +
bgColor.g + ',' +
bgColor.b + ',' + color.background.alpha + ');';
contrastPatch.children[1].firstChild.data = color['rgbaMixBGMix' + bgType] ?
'*' + color['rgbaMixBGMix' + bgType].WCAG2Ratio + '*' :
'-Test-';
};
/* ---------------------------------- */
/* ------- Render color values ------ */
/* ---------------------------------- */
var colorValues = document.getElementById('colorValues'),
renderColorValues = function(color) { // used in renderCallback of 'new ColorPicker'
var RND = color.RND;
colorValues.firstChild.data =
'rgba(' + RND.rgb.r + ',' + RND.rgb.g + ',' + RND.rgb.b + ',' + color.alpha + ')' + "\n" +
'hsva(' + RND.hsv.h + ',' + RND.hsv.s + ',' + RND.hsv.v + ',' + color.alpha + ')' + "\n" +
'hsla(' + RND.hsl.h + ',' + RND.hsl.s + ',' + RND.hsl.l + ',' + color.alpha + ')' + "\n" +
'CMYK(' + RND.cmyk.c + ',' + RND.cmyk.m + ',' + RND.cmyk.y + ',' + RND.cmyk.k + ')' + "\n" +
'CMY(' + RND.cmy.c + ',' + RND.cmy.m + ',' + RND.cmy.y + ')' + "\n" +
'Lab(' + RND.Lab.L + ',' + RND.Lab.a + ',' + RND.Lab.b + ')'; // + "\n" +
};
/* ---------------------------------- */
/* ---------- Color squares --------- */
/* ---------------------------------- */
var colorSquares = document.getElementById('color_squares'),
squares = colorSquares.children,
n = squares.length;
for (; n--;) { // draw random color values as background
squares[n].style.backgroundColor = 'rgb(' +
Math.round(Math.random() * 255) + ',' +
Math.round(Math.random() * 255) + ',' +
Math.round(Math.random() * 255) + ')';
}
Tools.addEvent(colorSquares, 'click', function(e) { // event delegation
var target = e.target || e.srcElement;
if (target.parentNode === this) {
myColor.setColor(target.style.backgroundColor);
startRender(true);
}
});
/* ---------------------------------- */
/* ---------- Color sliders --------- */
/* ---------------------------------- */
var sliders = document.getElementById('sliders'),
sliderChildren = sliders.children,
type,
mode,
max = {
rgb: {
r: 255,
g: 255,
b: 255
},
hsl: {
h: 360,
s: 100,
l: 100
},
cmy: {
c: 100,
m: 100,
y: 100
}
// hsv: {h: 360, s: 100, v: 100},
// cmyk: {c: 100, m: 100, y: 100, k: 100},
},
sliderDown = function(e) { // mouseDown callback
var target = e.target || e.srcElement,
id, len;
if (target !== this) {
if (e.preventDefault) e.preventDefault();
currentTarget = target.id ? target : target.parentNode;
id = currentTarget.id; // rgbR
len = id.length - 1;
type = id.substr(0, len); // rgb
mode = id.charAt(len).toLowerCase(); // R -> r
startPoint = Tools.getOrigin(currentTarget);
currentTargetWidth = currentTarget.offsetWidth;
sliderMove(e);
Tools.addEvent(window, 'mousemove', sliderMove);
startRender();
}
},
sliderMove = function(e) { // mouseMove callback
var newColor = {};
// The idea here is (so in the HSV-color-picker) that you don't
// render anything here but just send data to the colorPicker, no matter
// if it's out of range. colorPicker will take care of that and render it
// then in the renderColorSliders correctly (called in renderCallback).
newColor[mode] = (e.clientX - startPoint.left) / currentTargetWidth * max[type][mode];
myColor.setColor(newColor, type);
},
renderColorSliders = function(color) { // used in renderCallback of 'new ColorPicker'
for (var n = sliderChildren.length; n--;) {
var child = sliderChildren[n],
len = child.id.length - 1,
type = child.id.substr(0, len),
mode = child.id.charAt(len).toLowerCase();
if (child.id) child.children[0].style.width = (color.RND[type][mode] / max[type][mode] * 100) + '%';
}
};
Tools.addEvent(sliders, 'mousedown', sliderDown); // event delegation
Tools.addEvent(window, 'mouseup', function() {
Tools.removeEvent(window, 'mousemove', sliderMove);
stopRender();
});
/* ---------------------------------- */
/* ---- HSV-circle color picker ----- */
/* ---------------------------------- */
var hsv_map = document.getElementById('hsv_map'),
hsv_mapCover = hsv_map.children[1], // well...
hsv_mapCursor = hsv_map.children[2],
hsv_barBGLayer = hsv_map.children[3],
hsv_barWhiteLayer = hsv_map.children[4],
hsv_barCursors = hsv_map.children[6],
hsv_barCursorsCln = hsv_barCursors.className,
hsv_Leftcursor = hsv_barCursors.children[0],
hsv_Rightcursor = hsv_barCursors.children[1],
colorDisc = document.getElementById('surface'),
colorDiscRadius = colorDisc.offsetHeight / 2,
luminanceBar = document.getElementById('luminanceBar'),
hsvDown = function(e) { // mouseDown callback
var target = e.target || e.srcElement;
if (e.preventDefault) e.preventDefault();
currentTarget = target.id ? target : target.parentNode;
startPoint = Tools.getOrigin(currentTarget);
currentTargetHeight = currentTarget.offsetHeight; // as diameter of circle
Tools.addEvent(window, 'mousemove', hsvMove);
hsv_mapCover.style.cursor = hsv_mapCursor.style.cursor = 'none';
hsvMove(e);
startRender();
},
hsvMove = function(e) { // mouseMove callback
var r, x, y, h, s;
if (currentTarget === hsv_map) { // the circle
r = currentTargetHeight / 2,
x = e.clientX - startPoint.left - r,
y = e.clientY - startPoint.top - r,
h = 360 - ((Math.atan2(y, x) * 180 / Math.PI) + (y < 0 ? 360 : 0)),
s = (Math.sqrt((x * x) + (y * y)) / r) * 100;
myColor.setColor({
h: h,
s: s
}, 'hsv');
} else if (currentTarget === hsv_barCursors) { // the luminanceBar
myColor.setColor({
v: (currentTargetHeight - (e.clientY - startPoint.top)) / currentTargetHeight * 100
}, 'hsv');
}
},
renderHSVPicker = function(color) { // used in renderCallback of 'new ColorPicker'
var pi2 = Math.PI * 2,
x = Math.cos(pi2 - color.hsv.h * pi2),
y = Math.sin(pi2 - color.hsv.h * pi2),
r = color.hsv.s * (colorDiscRadius - 5);
hsv_mapCover.style.opacity = 1 - color.hsv.v;
// this is the faster version...
hsv_barWhiteLayer.style.opacity = 1 - color.hsv.s;
hsv_barBGLayer.style.backgroundColor = 'rgb(' +
color.hueRGB.r + ',' +
color.hueRGB.g + ',' +
color.hueRGB.b + ')';
hsv_mapCursor.style.cssText =
'left: ' + (x * r + colorDiscRadius) + 'px;' +
'top: ' + (y * r + colorDiscRadius) + 'px;' +
// maybe change className of hsv_map to change colors of all cursors...
'border-color: ' + (color.RGBLuminance > 0.22 ? '#333;' : '#ddd');
hsv_barCursors.className = color.RGBLuminance > 0.22 ? hsv_barCursorsCln + ' dark' : hsv_barCursorsCln;
if (hsv_Leftcursor) hsv_Leftcursor.style.top = hsv_Rightcursor.style.top = ((1 - color.hsv.v) * colorDiscRadius * 2) + 'px';
};
Tools.addEvent(hsv_map, 'mousedown', hsvDown); // event delegation
Tools.addEvent(window, 'mouseup', function() {
Tools.removeEvent(window, 'mousemove', hsvMove);
hsv_mapCover.style.cursor = hsv_mapCursor.style.cursor = 'crosshair';
stopRender();
});
// generic function for drawing a canvas disc
var drawDisk = function(ctx, coords, radius, steps, colorCallback) {
var x = coords[0] || coords, // coordinate on x-axis
y = coords[1] || coords, // coordinate on y-axis
a = radius[0] || radius, // radius on x-axis
b = radius[1] || radius, // radius on y-axis
angle = 360,
rotate = 0,
coef = Math.PI / 180;
ctx.save();
ctx.translate(x - a, y - b);
ctx.scale(a, b);
steps = (angle / steps) || 360;
for (; angle > 0; angle -= steps) {
ctx.beginPath();
if (steps !== 360) ctx.moveTo(1, 1); // stroke
ctx.arc(1, 1, 1, (angle - (steps / 2) - 1) * coef, (angle + (steps / 2) + 1) * coef);
if (colorCallback) {
colorCallback(ctx, angle);
} else {
ctx.fillStyle = 'black';
ctx.fill();
}
}
ctx.restore();
},
drawCircle = function(ctx, coords, radius, color, width) { // uses drawDisk
width = width || 1;
radius = [
(radius[0] || radius) - width / 2, (radius[1] || radius) - width / 2
];
drawDisk(ctx, coords, radius, 1, function(ctx, angle) {
ctx.restore();
ctx.lineWidth = width;
ctx.strokeStyle = color || '#000';
ctx.stroke();
});
};
if (colorDisc.getContext) {
drawDisk( // HSV color wheel with white center
colorDisc.getContext("2d"), [colorDisc.width / 2, colorDisc.height / 2], [colorDisc.width / 2 - 1, colorDisc.height / 2 - 1],
360,
function(ctx, angle) {
var gradient = ctx.createRadialGradient(1, 1, 1, 1, 1, 0);
gradient.addColorStop(0, 'hsl(' + (360 - angle + 0) + ', 100%, 50%)');
gradient.addColorStop(1, "#FFFFFF");
ctx.fillStyle = gradient;
ctx.fill();
}
);
drawCircle( // gray border
colorDisc.getContext("2d"), [colorDisc.width / 2, colorDisc.height / 2], [colorDisc.width / 2, colorDisc.height / 2],
'#555',
3
);
// draw the luminanceBar bar
var ctx = luminanceBar.getContext("2d"),
gradient = ctx.createLinearGradient(0, 0, 0, 200);
gradient.addColorStop(0, "transparent");
gradient.addColorStop(1, "black");
ctx.fillStyle = gradient;
ctx.fillRect(0, 0, 30, 200);
}
/*
* This script is set up so it runs either with ColorPicker or with Color only.
* The difference here is that ColorPicker has a renderCallback that Color doesn't have
* therefor we have to set a render intervall in case it's missing...
* setInterval() can be exchanged to window.requestAnimationFrame(callBack)...
*
* If you want to render on mouseMove only then get rid of startRender(); in
* all the mouseDown callbacks and add doRender(myColor.colors); in all
* mouseMove callbacks. (Also remove all stopRender(); in mouseUp callbacks)
*/
var doRender = function(color) {
renderTestPatch(color);
renderContrastPatch(color);
renderColorValues(color);
renderColorSliders(color);
renderHSVPicker(color);
// colorModel.innerHTML = displayModel(color); // experimental
},
renderTimer,
// those functions are in case there is no ColorPicker but only Colors involved
startRender = function(oneTime) {
if (isColorPicker) { // ColorPicker present
myColor.startRender(oneTime);
} else if (oneTime) { // only Colors is instanciated
doRender(myColor.colors);
} else {
renderTimer = window.setInterval(
function() {
doRender(myColor.colors);
// http://stackoverflow.com/questions/2940054/
}, 13); // 1000 / 60); // ~16.666 -> 60Hz or 60fps
}
},
stopRender = function() {
if (isColorPicker) {
myColor.stopRender();
} else {
window.clearInterval(renderTimer);
}
},
renderCallback = doRender,
// finally the instance of either ColorPicker or Colors (export for debugging purposes)
color_ColorPicker = new(ColorPicker || Colors)({
customBG: '#808080',
imagePath: 'images/'
}),
color_Colors = new Colors(),
myColor,
isColorPicker = colorSourceSelector.value === 'ColorPicker';
myColor = window.myColor = color_Colors;
// in case ColorPicker is not there...
if (!isColorPicker) { // initial rendering
doRender(myColor.colors);
}
colorSourceSelector.onchange = function(e) {
if (this.value === 'Colors') {
color_ColorPicker.color.options.renderCallback = function(color) {};
myColor = window.myColor = color_Colors;
isColorPicker = false;
doRender(myColor.colors);
} else {
color_ColorPicker.color.options.renderCallback = doRender;
myColor = window.myColor = color_ColorPicker;
isColorPicker = true;
doRender(myColor.color.colors);
}
}
function conversionTest(skipDisplay) {
if (skipDisplay) console.time('convertAll');
// conversion test
var convert = myColor.color ? myColor.color.convertColor : myColor.convertColor,
x = 0.85,
y = 0.33,
z = 0.23,
k = 0.1,
modes = ['hsl', 'hsv', 'rgb', 'cmy', 'cmyk', 'Lab', 'XYZ', 'HEX'],
color = {},
fromMode = '',
toMode = '',
counter = 0,
value,
colorOut = [],
valueOut = [],
isLab = false;
for (var o = 2; o--;) {
for (var n = 0, m = modes.length; n < m; n++) {
if (modes[n] === 'HEX') {
color = '89ABCD';
} else {
color = {};
isLab = modes[n] === 'Lab';
color[modes[n][0]] = o && !isLab ? x : Math.round(x * 100) + (isLab ? x : 0);
color[modes[n][1]] = o && !isLab ? y : Math.round(y * 100) + (isLab ? y : 0);
color[modes[n][2]] = o && !isLab ? z : Math.round(z * 100) + (isLab ? z : 0);
if (modes[n] === 'cmyk') {
color[modes[n][3]] = o ? k : Math.round(k * 100);;
}
}
fromMode = o ? modes[n] : modes[n].toUpperCase();
for (var d = 2; d--;) {
for (var p = 0, q = modes.length; p < q; p++) {
toMode = d ? modes[p] : modes[p].toUpperCase();
if (fromMode !== toMode) { // && fromMode !== 'LAB' && toMode !== 'LAB') {
if ((!d && /(?:XYZ|HEX)/.test(toMode)) || // good to avoid double 2XYZ or 2HEX
(!o && /(?:XYZ|HEX)/.test(fromMode))) { // good to avoid double XYZ2 or HEX2
// do nothing
} else {
value = convert(color, fromMode + '2' + toMode);
if (!skipDisplay) {
colorOut = [];
for (var s in color) {
colorOut.push(s + ': ' + color[s]);
}
colorOut = fromMode === 'HEX' ? '"' + color + '"' : '{' + colorOut.join(', ') + '}';
valueOut = [];
for (var s in value) {
valueOut.push(s + ': ' + value[s]);
}
valueOut = toMode === 'HEX' ? '"' + value + '"' : '{' + valueOut.join(', ') + '}';
console.log('convertColor(' + colorOut + ', "' + fromMode +
'2' + toMode + '") = ' + valueOut);
}
counter++;
}
}
}
}
}
}
console.log('Tested ' + counter + ' conversion combinations (excluding same to same)');
if (!skipDisplay) console.log('Call conversionTest(true) for timer (incl. calculations in for loops though...)');
if (skipDisplay) console.timeEnd('convertAll');
}
window.conversionTest = conversionTest;
// conversionTest();
})(window);.cp-app {
display: none;
}<link href="https://rawgit.com/PitPik/colorPicker/master/index.css" rel="stylesheet" />
<div id="testPatch">.</div>
<div id="contrastPatch">
<div></div><i>-Test-</i>
</div>
<div id="colorValues">.</div>
<div id="sliders" class="sliders">
<div id="rgbR">
<div></div>
</div>
<div id="rgbG">
<div></div>
</div>
<div id="rgbB">
<div></div>
</div>
<div id="hslH">
<div></div>
</div>
<div id="hslS">
<div></div>
</div>
<div id="hslL">
<div></div>
</div>
<!-- <div id="cmyC"><div></div></div>
<div id="cmyM"><div></div></div>
<div id="cmyY"><div></div></div> -->
</div>
<div id="hsv_map">
<canvas id="surface" width="200" height="200"></canvas>
<div class="cover"></div>
<div class="hsv-cursor"></div>
<div class="bar-bg"></div>
<div class="bar-white"></div>
<canvas id="luminanceBar" width="25" height="200"></canvas>
<div class="hsv-barcursors" id="hsv_cursors">
<div class="hsv-barcursor-l"></div>
<div class="hsv-barcursor-r"></div>
</div>
</div>
<div id="color_squares">
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>
<div id="description">Demo patches: demonstrate how to build color pickers and how Colors' / ColorPicker's API work. Patches are linked to
<select>
<option value="Colors">Colors</option>
<option value="ColorPicker">ColorPicker</option>
</select>
<p>See a simple jQuery implementation <a href="jQuery_implementation/">preview here</a> or a simple javaScript implementation <a href="javaScript_implementation/">preview here</a>
</p>
</div>
<script type="text/javascript" src="https://rawgit.com/PitPik/colorPicker/master/colors.js"></script>
<script type="text/javascript" src="https://rawgit.com/PitPik/colorPicker/master/colorPicker.data.js"></script>
<script type="text/javascript" src="https://rawgit.com/PitPik/colorPicker/master/colorPicker.js"></script>
<script type="text/javascript" src="index.js"></script>
答案 0 :(得分：2)
问题出现在renderHSVPicker函数的lines 275-277上，其中呈现光标时正在设置.cssText属性：
hsv_mapCursor.style.cssText =
'left: ' + (x * r + colorDiscRadius) + 'px;' +
'top: ' + (y * r + colorDiscRadius) + 'px;' +
// ...
此CSS将覆盖您在hsvDown回调中设置的光标样式。
设置这些属性时，简单的解决方案是将cursor设置为none：
hsv_mapCursor.style.cssText =
'left: ' + (x * r + colorDiscRadius) + 'px;' +
'top: ' + (y * r + colorDiscRadius) + 'px;' +
'cursor: none;' +
// ...
您仍然需要在cursor / mousedown回调中为封面元素设置mouseup属性：
// In the mousedown callback (line 220):
Tools.addEvent(window, 'mousemove', hsvMove);
hsv_mapCover.style.cursor = 'none';
// In the mouseup callback (line 271):
Tools.addEvent(window, 'mouseup', function() {
Tools.removeEvent(window, 'mousemove', hsvMove);
hsv_mapCover.style.cursor = '';
stopRender();
});