滑动拼图
当前滑动组件 使用了 https://gitee.com/LongbowEnterprise/SliderCaptcha 作者的
在原基础上面 改动为 触发式
<div class="slidercaptcha card">
<div class="card-body" style="margin-left: -17px;">
<div id="captcha" >
<input type="hidden" id="cap_id" value="errors" />
<div id="captimg" style="display: none;"></div>
<div id="capslider" style=" height: 29px;"></div>
</div>
</div>
</div>
var $captcha = $('#captcha').sliderCaptcha({
repeatIcon: 'layui-icon layui-icon-refersh',
setSrc: function () {
return '/app/static/code/Pic'+ Math.round(Math.random()*4) + '.jpg';
},
remoteUrl:'/login/Captcha',
onSuccess: function () { //成功事件
$('#cap_id').val('success'); //
$(this).css('pointer-events','none');
}
});
$('#capslider').hover(function(){
//$('#captimg').slideDown(100);
$('#captimg').show();
});
$('.slidercaptcha').mouseleave(function(){
$('#captimg').hide();
});
使用了layui形式的
layui.define(['layer', 'form', 'table', 'jquery'], function (exports) {
var $ = layui.$
var SliderCaptcha = function (element, options) {
this.$element = $(element);
this.options = $.extend({}, SliderCaptcha.DEFAULTS, options);
this.$element.css({ 'position': 'relative', 'width': this.options.width + 'px', 'margin': '0 auto' });
this.init();
};
SliderCaptcha.VERSION = '1.0';
SliderCaptcha.DEFAULTS = {
width: 234, // canvas宽度
height: 155, // canvas高度
PI: Math.PI,
sliderL: 42, // 滑块边长
sliderR: 9, // 滑块半径
offset: 5, // 容错偏差
loadingText: '正在加载中...',
failedText: '再试一次',
barText: '向右滑动填充拼图',
successText:'验证成功',
repeatIcon: 'fa fa-repeat',
maxLoadCount: 3,
localImages: function () {
return 'images/Pic' + Math.round(Math.random() * 4) + '.jpg';
},
verify: function (arr, url) {
var ret = false;
//console.log(JSON.stringify(arr))
$.ajax({
url: url,
data: arr,
async: false,
cache: false,
type: 'post',
// contentType: 'application/json',
dataType: 'json',
success: function (result) {
ret = result.status;
}
});
return ret;
},
remoteUrl: null
};
function Plugin(option) {
return this.each(function () {
var $this = $(this);
var data = $this.data('lgb.SliderCaptcha');
var options = typeof option === 'object' && option;
if (data && !/reset/.test(option)) return;
if (!data) $this.data('lgb.SliderCaptcha', data = new SliderCaptcha(this, options));
if (typeof option === 'string') data[option]();
});
}
$.fn.sliderCaptcha = Plugin;
$.fn.sliderCaptcha.Constructor = SliderCaptcha;
var _proto = SliderCaptcha.prototype;
_proto.init = function () {
this.initDOM();
this.initImg();
this.bindEvents();
};
_proto.initDOM = function () {
var createElement = function (tagName, className) {
var elment = document.createElement(tagName);
elment.className = className;
return elment;
};
var createCanvas = function (width, height) {
var canvas = document.createElement('canvas');
canvas.width = width;
canvas.height = height;
return canvas;
};
var canvas = createCanvas(this.options.width - 2, this.options.height); // 画布
var block = canvas.cloneNode(true); // 滑块
var sliderContainer = createElement('div', 'sliderContainer');
var refreshIcon = createElement('i', 'refreshIcon layui-icon layui-icon-refresh');
var sliderMask = createElement('div', 'sliderMask');
var sliderbg = createElement('div', 'sliderbg');
var slider = createElement('div', 'slider');
var sliderIcon = createElement('i', 'layui-icon layui-icon-right');
var text = createElement('span', 'sliderText');
block.className = 'block';
text.innerHTML = this.options.barText;
var captimg=$('#captimg');
var capslider=$('#capslider');
var el = this.$element;
captimg.append($(canvas));
captimg.append($(refreshIcon));
captimg.append($(block));
slider.appendChild(sliderIcon);
sliderMask.appendChild(slider);
sliderContainer.appendChild(sliderbg);
sliderContainer.appendChild(sliderMask);
sliderContainer.appendChild(text);
capslider.append($(sliderContainer));
var _canvas = {
canvas: canvas,
block: block,
sliderContainer: $(sliderContainer),
refreshIcon: refreshIcon,
slider: slider,
sliderMask: sliderMask,
sliderIcon: sliderIcon,
text: $(text),
canvasCtx: canvas.getContext('2d'),
blockCtx: block.getContext('2d')
};
if ($.isFunction(Object.assign)) {
Object.assign(this, _canvas);
}
else {
$.extend(this, _canvas);
}
};
_proto.initImg = function () {
var that = this;
var isIE = window.navigator.userAgent.indexOf('Trident') > -1;
var L = this.options.sliderL + this.options.sliderR * 2 + 3; // 滑块实际边长
var drawImg = function (ctx, operation) {
var l = that.options.sliderL;
var r = that.options.sliderR;
var PI = that.options.PI;
var x = that.x;
var y = that.y;
ctx.beginPath();
ctx.moveTo(x, y);
ctx.arc(x + l / 2, y - r + 2, r, 0.72 * PI, 2.26 * PI);
ctx.lineTo(x + l, y);
ctx.arc(x + l + r - 2, y + l / 2, r, 1.21 * PI, 2.78 * PI);
ctx.lineTo(x + l, y + l);
ctx.lineTo(x, y + l);
ctx.arc(x + r - 2, y + l / 2, r + 0.4, 2.76 * PI, 1.24 * PI, true);
ctx.lineTo(x, y);
ctx.lineWidth = 2;
ctx.fillStyle = 'rgba(255, 255, 255, 0.7)';
ctx.strokeStyle = 'rgba(255, 255, 255, 0.7)';
ctx.stroke();
ctx[operation]();
ctx.globalCompositeOperation = isIE ? 'xor' : 'destination-over';
};
var getRandomNumberByRange = function (start, end) {
return Math.round(Math.random() * (end - start) + start);
};
var img = new Image();
img.crossOrigin = "Anonymous";
var loadCount = 0;
img.onload = function () {
// 随机创建滑块的位置
that.x = getRandomNumberByRange(L + 10, that.options.width - (L + 10));
that.y = getRandomNumberByRange(10 + that.options.sliderR * 2, that.options.height - (L + 10));
drawImg(that.canvasCtx, 'fill');
drawImg(that.blockCtx, 'clip');
that.canvasCtx.drawImage(img, 0, 0, that.options.width - 2, that.options.height);
that.blockCtx.drawImage(img, 0, 0, that.options.width - 2, that.options.height);
var y = that.y - that.options.sliderR * 2 - 1;
var ImageData = that.blockCtx.getImageData(that.x - 3, y, L, L);
that.block.width = L;
that.blockCtx.putImageData(ImageData, 0, y + 1);
that.text.text(that.text.attr('data-text'));
};
img.onerror = function () {
loadCount++;
if (window.location.protocol === 'file:') {
loadCount = that.options.maxLoadCount;
console.error("can't load pic resource file from File protocal. Please try http or https");
}
if (loadCount >= that.options.maxLoadCount) {
that.text.text('加载失败').addClass('text-danger');
return;
}
img.src = that.options.localImages();
};
img.setSrc = function () {
var src = '';
loadCount = 0;
that.text.removeClass('text-danger');
if ($.isFunction(that.options.setSrc)) src = that.options.setSrc();
if (!src || src === '') src = 'https://picsum.photos/' + that.options.width + '/' + that.options.height + '/?image=' + Math.round(Math.random() * 20);
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
var xhr = new XMLHttpRequest();
xhr.onloadend = function (e) {
var file = new FileReader(); // FileReader仅支持IE10+
file.readAsDataURL(e.target.response);
file.onloadend = function (e) {
img.src = e.target.result;
};
};
xhr.open('GET', src);
xhr.responseType = 'blob';
xhr.send();
} else img.src = src;
};
img.setSrc();
this.text.attr('data-text', this.options.barText);
this.text.text(this.options.loadingText);
this.img = img;
};
_proto.clean = function () {
this.canvasCtx.clearRect(0, 0, this.options.width, this.options.height);
this.blockCtx.clearRect(0, 0, this.options.width, this.options.height);
this.block.width = this.options.width;
};
_proto.bindEvents = function () {
var that = this;
this.$element.on('selectstart', function () {
return false;
});
$(this.refreshIcon).on('click', function () {
that.text.text(that.options.barText);
that.reset();
if ($.isFunction(that.options.onRefresh)) that.options.onRefresh.call(that.$element);
});
var originX, originY, trail = [],
isMouseDown = false;
var handleDragStart = function (e) {
if (that.text.hasClass('text-danger')) return;
originX = e.clientX || e.touches[0].clientX;
originY = e.clientY || e.touches[0].clientY;
isMouseDown = true;
};
var handleDragMove = function (e) {
if (!isMouseDown) return false;
var eventX = e.clientX || e.touches[0].clientX;
var eventY = e.clientY || e.touches[0].clientY;
var moveX = eventX - originX;
var moveY = eventY - originY;
if (moveX < 0 || moveX + 40 > that.options.width) return false;
that.slider.style.left = (moveX - 1) + 'px';
var blockLeft = (that.options.width - 40 - 20) / (that.options.width - 40) * moveX;
that.block.style.left = blockLeft + 'px';
that.sliderContainer.addClass('sliderContainer_active');
that.sliderMask.style.width = (moveX + 4) + 'px';
trail.push(Math.round(moveY));
};
var handleDragEnd = function (e) {
if (!isMouseDown) return false;
isMouseDown = false;
var eventX = e.clientX || e.changedTouches[0].clientX;
if (eventX === originX) return false;
that.sliderContainer.removeClass('sliderContainer_active');
that.trail = trail;
var data = that.verify();
if (data.spliced && data.verified) {
that.sliderContainer.addClass('sliderContainer_success');
$('.sliderText').show();
$('.slider').find('.layui-icon').removeClass('layui-icon-right').addClass('layui-icon-ok');
$('.refreshIcon').hide();
that.text.text('验证成功');
if ($.isFunction(that.options.onSuccess)) that.options.onSuccess.call(that.$element);
} else {
that.sliderContainer.addClass('sliderContainer_fail');
if ($.isFunction(that.options.onFail)) that.options.onFail.call(that.$element);
setTimeout(function () {
that.text.text(that.options.failedText);
that.reset();
}, 1000);
}
};
this.slider.addEventListener('mousedown', handleDragStart);
this.slider.addEventListener('touchstart', handleDragStart);
document.addEventListener('mousemove', handleDragMove);
document.addEventListener('touchmove', handleDragMove);
document.addEventListener('mouseup', handleDragEnd);
document.addEventListener('touchend', handleDragEnd);
document.addEventListener('mousedown', function () { return false; });
document.addEventListener('touchstart', function () { return false; });
document.addEventListener('swipe', function () { return false; });
};
_proto.verify = function () {
var arr = this.trail; // 拖动时y轴的移动距离
var left = parseInt(this.block.style.left);
var test = {
'y_guiji':JSON.stringify(arr),
'y_width':left,
'y_left':this.x
}
var verified = false;
if (this.options.remoteUrl !== null) {
verified = this.options.verify(test, this.options.remoteUrl);
}
else {
var sum = function (x, y) { return x + y; };
var square = function (x) { return x * x; };
var average = arr.reduce(sum) / arr.length;
var deviations = arr.map(function (x) { return x - average; });
var stddev = Math.sqrt(deviations.map(square).reduce(sum) / arr.length);
verified = stddev !== 0;
}
return {
spliced: Math.abs(left - this.x) < this.options.offset,
verified: verified
};
};
_proto.reset = function () {
this.sliderContainer.removeClass('sliderContainer_fail sliderContainer_success');
this.slider.style.left = 0;
this.block.style.left = 0;
this.sliderMask.style.width = 0;
this.clean();
this.text.attr('data-text', this.text.text());
this.text.text(this.options.loadingText);
this.img.setSrc();
};
layui.link(layui.cache.base + 'SliderCaptcha/slidercaptcha.css');
//对外暴露的接口
exports('SliderCaptcha', SliderCaptcha);
});
php后台验证
$data=json_decode($test['y_guiji'],true);
//计算sum
$sum=array_sum($data);
//平均数
$avg=$sum*1.0/count($data);
$sum2=0;
//计算平方差
foreach($data as $v) {
$sum2+=pow($v-$avg,2);
}
//用方差和来计算平均数
$stddev=$sum2/count($data);
//已经滑动了
if ($stddev != 0) {
//容错值设为5
$width=$test['y_left'];
$block=$test['y_width'];
$pic=$width-$block;
if ($pic>=0 && $pic<=5) {
$_SESSION['captha_code']=true;
exit(returnJson(array('msg'=>'验证成功','status'=>true)));
}
} else {
exit(returnJson(array('msg'=>'验证失败','status'=>false)));
}
css 里面
