使用HTML5技术开发的超酷颜色选择器
日期：2012-10-23 来源：GBin1.comhttp://www.gbin1.com/technology/html/20121023-html-color-picker/title.jpg
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可能大家见过很多使用jquery/js开发的颜色选择器，今天这里我们将使用HTML5技术来自己实现一个更棒的颜色选择器。希望大家喜欢！
HTML代码
<!-- preview element --><div class="preview"></div><!-- colorpicker element --><div class="colorpicker" style="display:none"> <canvas id="picker" var="1" width="300" height="300"></canvas> <div class="controls"> <div><label>R</label> <input type="text" id="rVal" /></div> <div><label>G</label> <input type="text" id="gVal" /></div> <div><label>B</label> <input type="text" id="bVal" /></div> <div><label>RGB</label> <input type="text" id="rgbVal" /></div> <div><label>HEX</label> <input type="text" id="hexVal" /></div> </div></div>代码很简单，包含了2个部分，一个点击元素，一个用来展示颜色选择器的元素。
Javascript代码
$(function(){ var bCanPreview = true; // can preview // create canvas and context objects var canvas = document.getElementById('picker'); var ctx = canvas.getContext('2d'); // drawing active image var image = new Image(); image.onload = function () { ctx.drawImage(image, 0, 0, image.width, image.height); // draw the image on the canvas } // select desired colorwheel var imagesrc="images/colorwheel1.png"; switch ($(canvas).attr('var')) { case '2': imagesrc="images/colorwheel2.png"; break; case '3': imagesrc="images/colorwheel3.png"; break; case '4': imagesrc="images/colorwheel4.png"; break; case '5': imagesrc="images/colorwheel5.png"; break; } image.src = imageSrc; $('#picker').mousemove(function(e) { // mouse move handler if (bCanPreview) { // get coordinates of current position var canvasOffset = $(canvas).offset(); var canvasX = Math.floor(e.pageX - canvasOffset.left); var canvasY = Math.floor(e.pageY - canvasOffset.top); // get current pixel var imageData = ctx.getImageData(canvasX, canvasY, 1, 1); var pixel = imageData.data; // update preview color var pixelColor = "rgb("+pixel+", "+pixel+", "+pixel+")"; $('.preview').css('backgroundColor', pixelColor); // update controls $('#rVal').val(pixel); $('#gVal').val(pixel); $('#bVal').val(pixel); $('#rgbVal').val(pixel+','+pixel+','+pixel); var dColor = pixel + 256 * pixel + 65536 * pixel; $('#hexVal').val('#' + ('0000' + dColor.toString(16)).substr(-6)); } }); $('#picker').click(function(e) { // click event handler bCanPreview = !bCanPreview; }); $('.preview').click(function(e) { // preview click $('.colorpicker').fadeToggle("slow", "linear"); bCanPreview = true; });});大家可以看到，这是一个非常短的js代码，用来创建新的画布和对象，然后我们画出一个圆形的颜色板。你可以选择不同颜色底板。 这里使用一个参数来设定不同的选择。如下：
<canvas id="picker" var="1" width="300" height="300"></canvas><canvas id="picker" var="2" width="300" height="300"></canvas><canvas id="picker" var="3" width="300" height="300"></canvas><canvas id="picker" var="4" width="300" height="300"></canvas> <canvas id="picker" var="5" width="300" height="300"></canvas>下面我们添加事件：mousemove，click事件。这里使用jQuery来实现选择器的展现和隐藏。
$('.preview').click(function(e) { // preview click $('.colorpicker').fadeToggle("slow", "linear"); bCanPreview = true; });当我们的鼠标移动到选择对象上，我们需要刷新信息，例如，目前颜色
$('#picker').mousemove(function(e) { // mouse move handler if (bCanPreview) { // get coordinates of current position var canvasOffset = $(canvas).offset(); var canvasX = Math.floor(e.pageX - canvasOffset.left); var canvasY = Math.floor(e.pageY - canvasOffset.top); // get current pixel var imageData = ctx.getImageData(canvasX, canvasY, 1, 1); var pixel = imageData.data; // update preview color var pixelColor = "rgb("+pixel+", "+pixel+", "+pixel+")"; $('.preview').css('backgroundColor', pixelColor); // update controls $('#rVal').val(pixel); $('#gVal').val(pixel); $('#bVal').val(pixel); $('#rgbVal').val(pixel+','+pixel+','+pixel); var dColor = pixel + 256 * pixel + 65536 * pixel; $('#hexVal').val('#' + ('0000' + dColor.toString(16)).substr(-6)); }});$('#picker').click(function(e) { // click event handler bCanPreview = !bCanPreview;});CSS代码
不同颜色底板的CSS：
/* colorpicker styles */.colorpicker { background-color: #222222; border-radius: 5px 5px 5px 5px; box-shadow: 2px 2px 2px #444444; color: #FFFFFF; font-size: 12px; position: absolute; width: 460px;}#picker { cursor: crosshair; float: left; margin: 10px; border: 0;}.controls { float: right; margin: 10px;}.controls > div { border: 1px solid #2F2F2F; margin-bottom: 5px; overflow: hidden; padding: 5px;}.controls label { float: left;}.controls > div input { background-color: #121212; border: 1px solid #2F2F2F; color: #DDDDDD; float: right; font-size: 10px; height: 14px; margin-left: 6px; text-align: center; text-transform: uppercase; width: 75px;}.preview { background: url("../images/select.png") repeat scroll center center transparent; border-radius: 3px; box-shadow: 2px 2px 2px #444444; cursor: pointer; height: 30px; width: 30px;}希望大家喜欢！
http://www.gbin1.com/technology/html/20121023-html-color-picker/1.jpg
来源：使用HTML5技术开发的超酷颜色选择器
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