293 lines
12 KiB
JavaScript
293 lines
12 KiB
JavaScript
(function ($) {
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'use strict';
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var SliderCaptcha = function (element, options) {
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this.$element = $(element);
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this.options = $.extend({}, SliderCaptcha.DEFAULTS, options);
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this.$element.css({ 'position': 'relative', 'width': this.options.width + 'px', 'margin': '0 auto' });
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this.init();
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};
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SliderCaptcha.VERSION = '1.0';
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SliderCaptcha.Author = 'argo@163.com';
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SliderCaptcha.DEFAULTS = {
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width: 280, // canvas宽度
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height: 155, // canvas高度
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PI: Math.PI,
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sliderL: 42, // 滑块边长
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sliderR: 9, // 滑块半径
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offset: 5, // 容错偏差
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loadingText: '正在加载中...',
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failedText: '再试一次',
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barText: '向右滑动填充拼图',
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repeatIcon: 'fa fa-repeat',
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maxLoadCount: 3,
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localImages: function () {
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return 'images/Pic' + Math.round(Math.random() * 4) + '.jpg';
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}
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};
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function Plugin(option) {
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return this.each(function () {
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var $this = $(this);
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var data = $this.data('lgb.SliderCaptcha');
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var options = typeof option === 'object' && option;
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if (!data && /init|reset|verify/.test(option)) return;
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if (!data) $this.data('lgb.SliderCaptcha', data = new SliderCaptcha(this, options));
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if (typeof option === 'string') data[option]();
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});
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}
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$.fn.sliderCaptcha = Plugin;
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$.fn.sliderCaptcha.Constructor = SliderCaptcha;
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var _proto = SliderCaptcha.prototype;
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_proto.init = function () {
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this.initDOM();
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this.initImg();
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this.bindEvents();
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};
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_proto.initDOM = function () {
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var createElement = function (tagName, className) {
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var elment = document.createElement(tagName);
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elment.className = className;
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return elment;
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};
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var createCanvas = function (width, height) {
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var canvas = document.createElement('canvas');
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canvas.width = width;
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canvas.height = height;
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return canvas;
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};
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var canvas = createCanvas(this.options.width - 2, this.options.height) // 画布
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var block = canvas.cloneNode(true) // 滑块
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var sliderContainer = createElement('div', 'sliderContainer');
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var refreshIcon = createElement('i', 'refreshIcon ' + this.options.repeatIcon);
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var sliderMask = createElement('div', 'sliderMask');
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var sliderbg = createElement('div', 'sliderbg');
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var slider = createElement('div', 'slider');
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var sliderIcon = createElement('i', 'fa fa-arrow-right sliderIcon');
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var text = createElement('span', 'sliderText');
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block.className = 'block'
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text.innerHTML = this.options.barText;
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var el = this.$element;
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el.append($(canvas));
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el.append($(refreshIcon));
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el.append($(block));
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slider.appendChild(sliderIcon);
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sliderMask.appendChild(slider);
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sliderContainer.appendChild(sliderbg);
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sliderContainer.appendChild(sliderMask);
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sliderContainer.appendChild(text);
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el.append($(sliderContainer));
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Object.assign(this, {
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canvas,
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block,
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sliderContainer: $(sliderContainer),
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refreshIcon,
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slider,
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sliderMask,
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sliderIcon,
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text: $(text),
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canvasCtx: canvas.getContext('2d'),
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blockCtx: block.getContext('2d')
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})
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};
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_proto.initImg = function () {
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var that = this;
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var isIE = window.navigator.userAgent.indexOf('Trident') > -1;
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var L = this.options.sliderL + this.options.sliderR * 2 + 3; // 滑块实际边长
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var drawImg = function (ctx, operation) {
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var l = that.options.sliderL;
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var r = that.options.sliderR;
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var PI = that.options.PI;
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var x = that.x;
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var y = that.y;
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ctx.beginPath()
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ctx.moveTo(x, y)
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ctx.arc(x + l / 2, y - r + 2, r, 0.72 * PI, 2.26 * PI)
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ctx.lineTo(x + l, y)
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ctx.arc(x + l + r - 2, y + l / 2, r, 1.21 * PI, 2.78 * PI)
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ctx.lineTo(x + l, y + l)
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ctx.lineTo(x, y + l)
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ctx.arc(x + r - 2, y + l / 2, r + 0.4, 2.76 * PI, 1.24 * PI, true)
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ctx.lineTo(x, y)
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ctx.lineWidth = 2
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ctx.fillStyle = 'rgba(255, 255, 255, 0.7)'
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ctx.strokeStyle = 'rgba(255, 255, 255, 0.7)'
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ctx.stroke()
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ctx[operation]()
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ctx.globalCompositeOperation = isIE ? 'xor' : 'overlay'
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}
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var getRandomNumberByRange = function (start, end) {
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return Math.round(Math.random() * (end - start) + start);
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};
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var img = new Image();
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img.crossOrigin = "Anonymous";
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var loadCount = 0;
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img.onload = function () {
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// 随机创建滑块的位置
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that.x = getRandomNumberByRange(L + 10, that.options.width - (L + 10));
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that.y = getRandomNumberByRange(10 + that.options.sliderR * 2, that.options.height - (L + 10));
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drawImg(that.canvasCtx, 'fill');
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drawImg(that.blockCtx, 'clip');
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that.canvasCtx.drawImage(img, 0, 0, that.options.width - 2, that.options.height);
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that.blockCtx.drawImage(img, 0, 0, that.options.width - 2, that.options.height);
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var y = that.y - that.options.sliderR * 2 - 1;
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var ImageData = that.blockCtx.getImageData(that.x - 3, y, L, L);
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that.block.width = L;
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that.blockCtx.putImageData(ImageData, 0, y);
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that.text.text(that.text.attr('data-text'));
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};
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img.onerror = function () {
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loadCount++;
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if (window.location.protocol === 'file:') {
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loadCount = that.options.maxLoadCount;
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console.error("can't load pic resource file from File protocal. Please try http or https");
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}
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if (loadCount >= that.options.maxLoadCount) {
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that.text.text('加载失败').addClass('text-danger');
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return;
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}
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img.src = that.options.localImages();
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};
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img.setSrc = function () {
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var src = '';
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loadCount = 0;
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that.text.removeClass('text-danger');
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if ($.isFunction(that.options.setSrc)) src = that.options.setSrc();
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if (!src || src === '') src = 'https://picsum.photos/' + that.options.width + '/' + that.options.height + '/?image=' + Math.round(Math.random() * 20);
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if (isIE) { // IE浏览器无法通过img.crossOrigin跨域，使用ajax获取图片blob然后转为dataURL显示
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var xhr = new XMLHttpRequest()
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xhr.onloadend = function (e) {
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var file = new FileReader(); // FileReader仅支持IE10+
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file.readAsDataURL(e.target.response);
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file.onloadend = function (e) {
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img.src = e.target.result;
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}
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}
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xhr.open('GET', src);
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xhr.responseType = 'blob';
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xhr.send();
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} else img.src = src;
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};
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img.setSrc();
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this.text.attr('data-text', this.options.barText);
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this.text.text(this.options.loadingText);
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this.img = img
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};
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_proto.clean = function () {
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this.canvasCtx.clearRect(0, 0, this.options.width, this.options.height);
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this.blockCtx.clearRect(0, 0, this.options.width, this.options.height);
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this.block.width = this.options.width;
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};
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_proto.bindEvents = function () {
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var that = this;
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this.$element.on('selectstart', function () {
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return false;
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});
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$(this.refreshIcon).on('click', function () {
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that.text.text(that.options.barText);
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that.reset();
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if ($.isFunction(that.options.onRefresh)) that.options.onRefresh.call(that.$element);
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});
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var originX, originY, trail = [],
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isMouseDown = false
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var handleDragStart = function (e) {
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if (that.text.hasClass('text-danger')) return;
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originX = e.clientX || e.touches[0].clientX;
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originY = e.clientY || e.touches[0].clientY;
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isMouseDown = true;
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};
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var handleDragMove = function (e) {
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if (!isMouseDown) return false;
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var eventX = e.clientX || e.touches[0].clientX;
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var eventY = e.clientY || e.touches[0].clientY;
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var moveX = eventX - originX;
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var moveY = eventY - originY;
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if (moveX < 0 || moveX + 40 > that.options.width) return false;
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that.slider.style.left = (moveX - 1) + 'px';
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var blockLeft = (that.options.width - 40 - 20) / (that.options.width - 40) * moveX;
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that.block.style.left = blockLeft + 'px';
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that.sliderContainer.addClass('sliderContainer_active');
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that.sliderMask.style.width = (moveX + 4) + 'px';
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trail.push(moveY);
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};
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var handleDragEnd = function (e) {
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if (!isMouseDown) return false
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isMouseDown = false
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var eventX = e.clientX || e.changedTouches[0].clientX
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if (eventX == originX) return false
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that.sliderContainer.removeClass('sliderContainer_active');
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that.trail = trail
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var {
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spliced,
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verified
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} = that.verify()
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if (spliced && verified) {
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that.sliderContainer.addClass('sliderContainer_success');
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if ($.isFunction(that.options.onSuccess)) that.options.onSuccess.call(that.$element);
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} else {
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that.sliderContainer.addClass('sliderContainer_fail');
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if ($.isFunction(that.options.onFail)) that.options.onFail.call(that.$element);
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setTimeout(() => {
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that.text.text(that.options.failedText);
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that.reset();
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}, 1000);
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}
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};
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this.slider.addEventListener('mousedown', handleDragStart);
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this.slider.addEventListener('touchstart', handleDragStart);
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document.addEventListener('mousemove', handleDragMove);
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document.addEventListener('touchmove', handleDragMove);
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document.addEventListener('mouseup', handleDragEnd);
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document.addEventListener('touchend', handleDragEnd);
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document.addEventListener('mousedown', function () { return false; });
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document.addEventListener('touchstart', function () { return false; });
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};
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_proto.verify = function () {
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var sum = function (x, y) { return x + y; };
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var square = function (x) { return x * x; };
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var arr = this.trail // 拖动时y轴的移动距离
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var average = arr.reduce(sum) / arr.length;
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var deviations = arr.map(function (x) { return x - average; });
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var stddev = Math.sqrt(deviations.map(square).reduce(sum) / arr.length);
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var left = parseInt(this.block.style.left);
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return {
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spliced: Math.abs(left - this.x) < this.options.offset,
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verified: stddev !== 0, // 简单验证下拖动轨迹，为零时表示Y轴上下没有波动，可能非人为操作
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}
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};
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_proto.reset = function () {
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this.sliderContainer.removeClass('sliderContainer_fail sliderContainer_success');
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this.slider.style.left = 0
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this.block.style.left = 0
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this.sliderMask.style.width = 0
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this.clean()
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this.text.attr('data-text', this.text.text());
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this.text.text(this.options.loadingText);
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this.img.setSrc();
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};
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})(jQuery); |