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js实现拾色器插件（ColorPicker）

程序员文章站 2022-06-24 16:30:09
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。...

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：

js实现拾色器插件（ColorPicker）

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。

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