使用HTML5技术开发的超酷颜色选择器

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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[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]);

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