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!
<!-- preview element --> <p class="preview"></p> <!-- colorpicker element --> <p class="colorpicker" style="display:none"> <canvas id="picker" var="1" width="300" height="300"></canvas> <p class="controls"> <p><label>R</label> <input type="text" id="rVal" /></p> <p><label>G</label> <input type="text" id="gVal" /></p> <p><label>B</label> <input type="text" id="bVal" /></p> <p><label>RGB</label> <input type="text" id="rgbVal" /></p> <p><label>HEX</label> <input type="text" id="hexVal" /></p> </p> </p>
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。
$(function(){ var bCanPreview = true; // can preview // create canvas and context objects var canvas = document.getElementById('picker'); var ctx = canvas.getContext('2d'); // drawing active image var image = new Image(); image.onload = function () { ctx.drawImage(image, 0, 0, image.width, image.height); // draw the image on the canvas } // select desired colorwheel var imagesrc="images/colorwheel1.png"; switch ($(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[0]+", "+pixel[1]+", "+pixel[2]+")"; $('.preview').css('backgroundColor', pixelColor); // update controls $('#rVal').val(pixel[0]); $('#gVal').val(pixel[1]); $('#bVal').val(pixel[2]); $('#rgbVal').val(pixel[0]+','+pixel[1]+','+pixel[2]); var dColor = pixel[2] + 256 * pixel[1] + 65536 * pixel[0]; $('#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; });
$('#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[0]+", "+pixel[1]+", "+pixel[2]+")"; $('.preview').css('backgroundColor', pixelColor); // update controls $('#rVal').val(pixel[0]); $('#gVal').val(pixel[1]); $('#bVal').val(pixel[2]); $('#rgbVal').val(pixel[0]+','+pixel[1]+','+pixel[2]); var dColor = pixel[2] + 256 * pixel[1] + 65536 * pixel[0]; $('#hexVal').val('#' + ('0000' + dColor.toString(16)).substr(-6)); } }); $('#picker').click(function(e) { // click event handler bCanPreview = !bCanPreview; });
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 > p { border: 1px solid #2F2F2F; margin-bottom: 5px; overflow: hidden; padding: 5px; } .controls label { float: left; } .controls > p 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!
以上就是使用HTML5技术开发的超酷颜色选择器的内容,更多相关内容请关注PHP中文网(www.php.cn)!