js实现拾色器插件（ColorPicker）
作者：Yirujet
这篇文章主要为大家详细介绍了js实现拾色器插件ColorPicker，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
对一个前端来说，颜色选择的插件肯定不陌生，许多小伙伴对这类插件的实现可能会比较好奇，这里奉上原生js版本的拾色器。
效果图：
讲下实现方式：
1.颜色除了RGB跟十六进制的表现外，还有一个HSV的表现形式。H（hue）是色相，值域是0度到360度，这个值控制的是你看到的是什么颜色，通俗点讲就是红橙黄绿...；S（saturation）是饱和度，值域是0到1，这个值控制颜色的鲜艳程度，可以理解为大红跟淡红的差别；V（value）可以理解为亮度，值域也是0到1。
2.rgb颜色跟hsv颜色的相互转化有专门的公式，可自行去百度了解下
3.面向对象的编程方式公认为易扩展，高复用。
整个目录结构如下：
COLORPICKER
--css
--common.css（样式）
--js
--colorPicker.js（插件主体）
--event.js（简易的发布者-订阅者实现）
--inherite.js（继承手段，寄生组合式）
ColorPicker.html
使用说明：
插件目前只支持传入h、s、v值来初始化颜色，若什么都不传，默认h、s、v都为0，实例化ColorPicker构造函数后，通过select方法初始化；目前只暴露了两个回调接口onHChange（色相改变触发）、onSVChange（饱和度或亮度改变触发）：
var aa = new ColorPicker();
aa.select(
// {
// h: 120,
// s: 1,
// b: 1
// }
);
aa.onHChange = function(e) {};
aa.onSVChange = function(e) {};
代码如下：
ColorPicker.html：
<!DOCTYPE html> <!--[if lt IE 7]> <html class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]--> <!--[if IE 7]> <html class="no-js lt-ie9 lt-ie8"> <![endif]--> <!--[if IE 8]> <html class="no-js lt-ie9"> <![endif]--> <!--[if gt IE 8]><!--> <html class="no-js"> <!--<![endif]--> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Color Picker</title> <meta name="description" content=""> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="./css/common.css" rel="external nofollow" > </head> <body> </body> <script type="text/javascript" src="js/event.js"></script> <script type="text/javascript" src="js/inherite.js"></script> <script type="text/javascript" src="js/colorPicker.js"></script> </html>
common.css：
body {
height: calc(100vh);
overflow: hidden;
background: gray;
}
.color-picker-container {
border: 0;
width: 300px;
margin: 0 auto;
}
.color-picker-container .val-container {
border: 1px solid silver;
text-align: center;
line-height: 30px;
font-weight: bold;
}
.color-picker-container .val-container .val {
width: 100%;
border: 0;
line-height: 32px;
text-align: center;
font-weight: bold;
}
.color-picker-container .picker-container {
position: relative;
width: 100%;
margin-top: 15px;
}
.color-picker-container .picker-container .pointer {
position: absolute;
width: 14px;
height: 14px;
border-radius: 50%;
border: 3px solid #FFFFFF;
margin-left: -9px;
margin-top: -9px;
top: 255px;
left: 0;
cursor: pointer;
}
.color-picker-container .picker-container .saturation-range {
float: left;
width: 255px;
height: 255px;
/* background-color: rgba(0, 0, 0, .2); */
box-shadow: 1px 1px 5px rgba(0, 0, 0, .6);
}
.color-picker-container .picker-container .saturation-range .cover {
width: 100%;
height: 100%;
background: -webkit-linear-gradient(top, rgb(0, 0, 0, 0) 0%, rgb(0, 0, 0) 100%);
background: linear-gradient(top, rgb(0, 0, 0, 0) 0%, rgb(0, 0, 0) 100%);
}
.color-picker-container .picker-container .hue-range {
float: right;
width: 30px;
height: 255px;
box-shadow: 1px 1px 5px rgba(0, 0, 0, .6);
background: -webkit-linear-gradient(top,
rgb(255, 0, 0) 0%,
rgb(255, 0, 255) 17%,
rgb(0, 0, 255) 34%,
rgb(0, 255, 255) 50%,
rgb(0, 255, 0) 67%,
rgb(255, 255, 0) 84%,
rgb(255, 0, 0) 100%);
background: linear-gradient(top,
rgb(255, 0, 0) 0%,
rgb(255, 0, 255) 17%,
rgb(0, 0, 255) 34%,
rgb(0, 255, 255) 50%,
rgb(0, 255, 0) 67%,
rgb(255, 255, 0) 84%,
rgb(255, 0, 0) 100%);
}
.color-picker-container .picker-container .hue-range .cursor {
position: relative;
width: 44px;
margin-top: -11px;
top: 255px;
cursor: n-resize;
}
.color-picker-container .picker-container .hue-range .cursor::before {
content: '';
display: inline-block;
width: 0;
height: 0;
border-style: solid;
border-top-width: 5px;
border-right-width: 0;
border-bottom-width: 5px;
border-left-width: 7px;
border-top-color: transparent;
border-bottom-color: transparent;
border-left-color: rgba(0, 0, 0, .5);
margin-left: -8px;
}
.color-picker-container .picker-container .hue-range .cursor::after {
content: '';
display: inline-block;
width: 0;
height: 0;
border-style: solid;
border-top-width: 5px;
border-right-width: 7px;
border-bottom-width: 5px;
border-left-width: 0;
border-top-color: transparent;
border-bottom-color: transparent;
border-right-color: rgba(0, 0, 0, .5);
margin-left: 33px;
}
.color-picker-container .picker-container::after {
content: '';
display: block;
clear: both;
line-height: 0;
visibility: hidden;
}
event.js：
function Event() {
this.bindEvent = [];
}
Event.prototype.addEvent = function(name, callback) {
if(typeof callback !== 'function') return;
var bExistEvent = false;
var untieEvent = function() {
if(window.removeEventListener) {
this.element.removeEventListener(name, callback);
} else if(window.detachEvent) {
this.element.detachEvent('on' + name, callback);
} else {
this.element['on' + name] = null;
}
};
for(var i = 0, len = this.bindEvent.length; i < len; i++) {
if(this.bindEvent[i].name == name) {
this.removeEvent(name);
this.bindEvent[i].untie = untieEvent;
this.bindEvent[i].event = callback;
bExistEvent = true;
break;
}
}
if(window.addEventListener) {
this.element.addEventListener(name, callback);
} else if(window.attachEvent) {
this.element.attachEvent('on' + name, callback);
} else {
this.element['on' + name] = callback;
}
if(!bExistEvent) {
this.bindEvent.push({
name: name,
event: callback,
untie: function() {
if(window.removeEventListener) {
this.element.removeEventListener(name, callback);
} else if(window.detachEvent) {
this.element.detachEvent('on' + name, callback);
} else {
this.element['on' + name] = null;
}
}
});
}
}
Event.prototype.removeEvent = function(name) {
if(typeof name === 'undefined' || name === '') return;
// 从已绑定事件列表中剔除
for(var i = 0, len = this.bindEvent.length; i < len; i++) {
if(this.bindEvent[i].name == name) {
this.bindEvent[i].untie.call(this); // 移除绑定事件
this.bindEvent.splice(i, 1); // 从事件列表删除
break;
}
}
}
Event.prototype.triggerEvent = function(name) {
var callback = null;
for(var i = 0, len = this.bindEvent.length; i < len; i++) {
if(this.bindEvent[i].name === name) {
callback = this.bindEvent[i].event;
}
}
if(typeof callback === 'function') {
callback.apply(this, [].slice.call(arguments).slice(1));
}
}
inherite.js：
function inheritObj(o) {
function F() {};
F.prototype = o;
return new F();
}
function inheritProto(subclass, supclass) {
subclass.prototype = inheritObj(supclass.prototype);
subclass.prototype.constructor = subclass;
}
function extend(p, o) {
for(var item in o) {
if(!p.hasOwnProperty(item)) {
p[item] = o[item];
}
}
}
function Container(className) {
this.element = null;
this.className = className || '';
this.parent = null;
this.children = [];
this.init();
}
Container.prototype.init = function() {
this.element = document.createElement(this.tagname || 'div');
this.className && (this.element.className = this.className);
}
Container.prototype.getElement = function() {
return this.element;
}
Container.prototype.add = function(item) {
item.parent = this;
this.children.push(item);
this.element.appendChild(item.getElement());
return this;
}
function Item(className, tagname) {
this.tagname = tagname || 'div';
Container.call(this, className);
delete this.children;
}
inheritProto(Item, Container);
Item.prototype.add = function() {
throw new Error('[[Type Item]] can not add any other item');
}
colorPicker.js：
(function() {
this.ColorPicker = function() {
Container.call(this);
this.hsv = [0, 0, 0];
this.rgb = [0, 0, 0];
this.svFieldHsv = [0, 1, 1];
this.svFieldRgb = [0, 0, 0];
}
inheritProto(ColorPicker, Container);
ColorPicker.prototype.init = function() {
this.element = document.createElement('div');
this.element.className = 'color-picker-container';
var _container = createContainer(),
_self = this;
Event.call(_container);
extend(_container, Event.prototype);
createVal.call(this);
createSV.call(_container);
createH.call(_container);
_container.addEvent('sv-change', function(e) {
// 暴露出饱和度change接口
_self.onSVChange(e);
});
_container.addEvent('h-change', function(e) {
// 暴露出色相change接口
_self.onHChange(e);
});
this.add(_container);
}
ColorPicker.prototype.select = function(opt) {
if(opt && typeof opt !== 'undefined') {
this.hsv[0] = opt.h || 0;
this.hsv[1] = opt.s || 0;
this.hsv[2] = opt.b || 0;
this.svFieldHsv[0] = opt.hue || 0;
}
if(this.children[0].children[0].getElement().value !== '') {
var val = this.children[0].children[0].getElement().value,
regRgb = /rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)/,
r = val.replace(regRgb, '$1'),
g = val.replace(regRgb, '$2'),
b = val.replace(regRgb, '$3');
this.hsv = rgb2hsv(r, g, b);
this.svFieldHsv[0] = this.hsv[0];
}
this.svFieldRgb = hsv2rgb(this.svFieldHsv[0], this.svFieldHsv[1], this.svFieldHsv[2]);
this.updateSVField();
this.rgb = hsv2rgb(this.hsv[0], this.hsv[1], this.hsv[2]);
this.updateSVPointer();
this.updateVal(opt);
this.children[1].children[0].getElement().style.cssText += ';left: ' + this.hsv[1] * 255 + 'px;top: ' + (255 - this.hsv[2] * 255) + 'px;';
this.children[1].children[2].children[0].getElement().style.cssText += ';top: ' + (255 - this.hsv[0]) + 'px;';
document.body.appendChild(this.element);
return this;
}
ColorPicker.prototype.updateSVField = function() {
this.children[1].children[1].getElement().style.cssText = ';background: -webkit-linear-gradient(left, rgb(255, 255, 255) 0%, rgb(' + ~~this.svFieldRgb[0] + ', ' + ~~this.svFieldRgb[1] + ', ' + ~~this.svFieldRgb[2] + ') 100%)';
}
ColorPicker.prototype.updateSVPointer = function() {
this.children[1].children[0].getElement().style.cssText += ';background-color: rgb(' + ~~this.rgb[0] + ', ' + ~~this.rgb[1] + ', ' + ~~this.rgb[2] + ')';
}
ColorPicker.prototype.updateVal = function() {
var _hsv_temp = [0, 0, 0];
if(this.hsv[1] < 0.5 && this.hsv[2] > 0.5) {
_hsv_temp = [this.hsv[0], 1, 0];
} else {
_hsv_temp = [this.hsv[0], 0, 1];
}
var _rgb_temp = hsv2rgb(_hsv_temp[0], _hsv_temp[1], _hsv_temp[2]);
this.children[0].children[0].getElement().style.cssText += ';text-shadow: 0 0 5px;color: rgb(' + ~~_rgb_temp[0] + ', ' + ~~_rgb_temp[1] + ', ' + ~~_rgb_temp[2] + ');background-color: rgb(' + ~~this.rgb[0] + ', ' + ~~this.rgb[1] + ', ' + ~~this.rgb[2] + ')';
this.children[1].children[0].getElement().style.cssText += ';border-color: rgb(' + ~~_rgb_temp[0] + ', ' + ~~_rgb_temp[1] + ', ' + ~~_rgb_temp[2] + ')';
this.children[0].children[0].getElement().value = 'rgb(' + ~~this.rgb[0] + ', ' + ~~this.rgb[1] + ', ' + ~~this.rgb[2] + ')';
}
ColorPicker.prototype.onSVChange = function(callVal) {
arguments.callee.call(this, callVal);
return this;
}
ColorPicker.prototype.onHChange = function(callVal) {
arguments.callee.call(this, callVal);
return this;
}
function createVal() {
var _container = new Container('val-container'),
_input = new Item('val', 'input');
Event.call(_input);
extend(_input, Event.prototype);
_input.addEvent('blur', this.select.bind(this));
_container.add(_input);
this.add(_container);
}
function createContainer() {
var _container = new Container('picker-container');
return _container;
}
function createSV() {
var _pointer = new Item('pointer'),
_saturationRange = new Container('saturation-range'),
_cover = new Item('cover'),
_self = this;
Event.call(_pointer);
extend(_pointer, Event.prototype);
_saturationRange.add(_cover);
function cursorDown(e) {
var _top = typeof e.target.style.top === 'undefined' ? 255 : parseFloat(e.target.style.top),
_left = typeof e.target.style.left === 'undefined' ? 0 : parseFloat(e.target.style.left),
_distanceY, _distanceX, realTop, realLeft;
function move(e2) {
_distanceY = e2.clientY - e.clientY;
_distanceX = e2.clientX - e.clientX;
realTop = _top + _distanceY;
realLeft = _left + _distanceX;
realTop < 0 && (realTop = 0);
realTop > 255 && (realTop = 255);
realLeft < 0 && (realLeft = 0);
realLeft > 255 && (realLeft = 255);
e.target.style.top = realTop + 'px';
e.target.style.left = realLeft + 'px';
_self.parent.hsv[1] = realLeft / 255;
_self.parent.hsv[2] = (255 - realTop) / 255;
_self.parent.rgb = hsv2rgb(_self.parent.hsv[0], _self.parent.hsv[1], _self.parent.hsv[2]);
_self.parent.updateSVPointer();
_self.parent.updateVal();
}
function up() {
document.removeEventListener('mousemove', move);
document.removeEventListener('mouseup', up);
_self.triggerEvent('sv-change', [realLeft / 255, (255 - realTop) / 255]);
}
document.addEventListener('mousemove', move);
document.addEventListener('mouseup', up);
}
_pointer.addEvent('mousedown', cursorDown);
this.add(_pointer)
.add(_saturationRange);
}
function createH() {
var _hueRange = new Container('hue-range'),
_cursor = new Item('cursor'),
_self = this;
Event.call(_cursor);
extend(_cursor, Event.prototype);
function cursorDown(e) {
var _top = typeof e.target.style.top === 'undefined' ? 255 : parseFloat(e.target.style.top),
_distance, realTop;
function move(e2) {
_distance = e2.clientY - e.clientY;
realTop = _top + _distance;
realTop < 0 && (realTop = 0);
realTop > 255 && (realTop = 255);
e.target.style.top = realTop + 'px';
_self.parent.svFieldHsv[0] = 255 - realTop;
_self.parent.svFieldRgb = hsv2rgb(_self.parent.svFieldHsv[0], _self.parent.svFieldHsv[1], _self.parent.svFieldHsv[2]);
_self.parent.updateSVField();
_self.parent.hsv[0] = 255 - realTop;
_self.parent.rgb = hsv2rgb(_self.parent.hsv[0], _self.parent.hsv[1], _self.parent.hsv[2]);
_self.parent.updateSVPointer();
_self.parent.updateVal();
}
function up() {
document.removeEventListener('mousemove', move);
document.removeEventListener('mouseup', up);
_self.triggerEvent('h-change', 255 - realTop);
}
document.addEventListener('mousemove', move);
document.addEventListener('mouseup', up);
}
_cursor.addEvent('mousedown', cursorDown);
_hueRange.add(_cursor);
this.add(_hueRange);
}
function hsv2rgb(h, s, v) {
h = h / 255 * 360;
var hi = Math.floor(h / 60) % 6,
f = h / 60 - Math.floor(h / 60),
p = v * (1 - s),
q = v * (1 - f * s),
t = v * (1 - (1 - f) * s),
c = [
[v, t, p],
[q, v, p],
[p, v, t],
[p, q, v],
[t, p, v],
[v, p, q]
][hi];
return [c[0] * 255, c[1] * 255, c[2] * 255];
}
function rgb2hsv(r, g, b) {
var max = Math.max(r, g, b),
min = Math.min(r, g, b),
h, s, v,
d = max - min;
if (max == min) {
h = 0;
} else if (max == r) {
h = 60 * ((g - b) / d);
} else if (max == g) {
h = 60 * ((b - r) / d) + 120;
} else {
h = 60 * ((r - g) / d) + 240;
}
s = max == 0 ? 0 : (1 - min / max);
v = max;
if(h < 0) {
h += 360;
}
return [h * 255 / 360, s, v / 255];
}
})()
var aa = new ColorPicker();
aa.select(
// {
// h: 120,
// s: 1,
// b: 1
// }
);
aa.onHChange = function(e) {};
aa.onSVChange = function(e) {};
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。