html+jQuery实现拖动滑块图片拼图验证码插件【移动端适用】
程序员文章站
2022-12-18 18:56:50
电脑和手机移动端都适用的jquery拖动滑块图片拼图验证码插件，通过鼠标拖动或触屏滑动填充拼图来进行安全验证，点击刷新可以更换当前待验证的图片。
html & css：...
电脑和手机移动端都适用的jquery拖动滑块图片拼图验证码插件，通过鼠标拖动或触屏滑动填充拼图来进行安全验证，点击刷新可以更换当前待验证的图片。
html & css：
<!doctype html>
<html lang="zh">
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>拖动滑块图片拼图验证码插件</title>
<!--框架样式-->
<link href="css/bootstrap.min.css" rel="external nofollow" rel="stylesheet">
<!--图标样式-->
<link href="https://cdn.bootcss.com/font-awesome/5.7.2/css/all.min.css" rel="stylesheet">
<!--主要样式-->
<link href="disk/slidercaptcha.css" rel="external nofollow" rel="stylesheet" />
<style>
.slidercaptcha {
margin: 0 auto;
width: 314px;
height: 286px;
border-radius: 4px;
box-shadow: 0 0 10px rgba(0, 0, 0, 0.125);
margin-top: 40px;
}
.slidercaptcha .card-body {
padding: 1rem;
}
.slidercaptcha canvas:first-child {
border-radius: 4px;
border: 1px solid #e6e8eb;
}
.slidercaptcha.card .card-header {
background-image: none;
background-color: rgba(0, 0, 0, 0.03);
}
.refreshicon {
top: -54px;
}
</style>
</head>
<body>
<div class="container-fluid">
<div class="form-row">
<div class="col-12">
<div class="slidercaptcha card">
<div class="card-header">
<span>请完成安全验证</span>
</div>
<div class="card-body"><div id="captcha"></div></div>
</div>
</div>
</div>
</div>
<script src="js/jquery-1.11.0.min.js" type="text/javascript"></script>
<script src="disk/longbow.slidercaptcha.js"></script>
<script>
$('#captcha').slidercaptcha({
repeaticon: 'fa fa-redo',
setsrc: function () {
return 'http://images.sdgxgz.com/pic' + math.round(math.random() * 136) + '.jpg';
},
onsuccess: function () {
alert('验证通过!');
}
});
</script>
</body>
</html>
disk/slidercaptcha.css：
body {
overflow-x: hidden;
}
.block {
position: absolute;
left: 0;
top: 0;
}
.slidercontainer {
position: relative;
text-align: center;
line-height: 40px;
background: #f7f9fa;
color: #45494c;
border-radius: 2px;
}
.sliderbg {
position: absolute;
left: 0;
right: 0;
top: 0;
background-color: #f7f9fa;
height: 40px;
border-radius: 2px;
border: 1px solid #e6e8eb;
}
.slidercontainer_active .slider {
top: -1px;
border: 1px solid #1991fa;
}
.slidercontainer_active .slidermask {
border-width: 1px 0 1px 1px;
}
.slidercontainer_success .slider {
top: -1px;
border: 1px solid #52ccba;
background-color: #52ccba !important;
}
.slidercontainer_success .slidermask {
border: 1px solid #52ccba;
border-width: 1px 0 1px 1px;
background-color: #d2f4ef;
}
.slidercontainer_success .slidericon:before {
content: "\f00c";
}
.slidercontainer_fail .slider {
top: -1px;
border: 1px solid #f57a7a;
background-color: #f57a7a !important;
}
.slidercontainer_fail .slidermask {
border: 1px solid #f57a7a;
background-color: #fce1e1;
border-width: 1px 0 1px 1px;
}
.slidercontainer_fail .slidericon:before {
content: "\f00d";
}
.slidercontainer_active .slidertext, .slidercontainer_success .slidertext, .slidercontainer_fail .slidertext {
display: none;
}
.slidermask {
position: absolute;
left: 0;
top: 0;
height: 40px;
border: 0 solid #1991fa;
background: #d1e9fe;
border-radius: 2px;
}
.slider {
position: absolute;
top: 0;
left: 0;
width: 40px;
height: 40px;
background: #fff;
box-shadow: 0 0 3px rgba(0, 0, 0, 0.3);
cursor: pointer;
transition: background .2s linear;
border-radius: 2px;
display: flex;
align-items: center;
justify-content: center;
}
.slider:hover {
background: #1991fa;
}
.slider:hover .slidericon {
background-position: 0 -13px;
}
.slidertext {
position: relative;
}
.slidericon {
}
.refreshicon {
position: absolute;
right: 0;
top: 0;
cursor: pointer;
margin: 6px;
color: rgba(0,0,0,.25);
font-size: 1rem;
z-index: 5;
transition: color .3s linear;
}
.refreshicon:hover {
color: #6c757d;
}
disk/longbow.slidercaptcha.js：
(function ($) {
'use strict';
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.author = 'argo@163.com';
slidercaptcha.defaults = {
width: 280, // 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',
repeaticon: 'fa fa-repeat',
maxloadcount: 3,
localimages: function () {
return 'images/pic' + math.round(math.random() * 4) + '.jpg';
}
};
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;
$.fn.slidercaptcha.constructor = slidercaptcha;
var _proto = slidercaptcha.prototype;
_proto.init = function () {
this.initdom();
this.initimg();
this.bindevents();
};
_proto.initdom = function () {
var createelement = function (tagname, classname) {
var elment = document.createelement(tagname);
elment.classname = classname;
return elment;
};
var createcanvas = function (width, height) {
var canvas = document.createelement('canvas');
canvas.width = width;
canvas.height = height;
return canvas;
};
var canvas = createcanvas(this.options.width - 2, this.options.height) // 画布
var block = canvas.clonenode(true) // 滑块
var slidercontainer = createelement('div', 'slidercontainer');
var refreshicon = createelement('i', 'refreshicon ' + this.options.repeaticon);
var slidermask = createelement('div', 'slidermask');
var sliderbg = createelement('div', 'sliderbg');
var slider = createelement('div', 'slider');
var slidericon = createelement('i', 'fa fa-arrow-right slidericon');
var text = createelement('span', 'slidertext');
block.classname = 'block'
text.innerhtml = this.options.bartext;
var el = this.$element;
el.append($(canvas));
el.append($(refreshicon));
el.append($(block));
slider.appendchild(slidericon);
slidermask.appendchild(slider);
slidercontainer.appendchild(sliderbg);
slidercontainer.appendchild(slidermask);
slidercontainer.appendchild(text);
el.append($(slidercontainer));
object.assign(this, {
canvas,
block,
slidercontainer: $(slidercontainer),
refreshicon,
slider,
slidermask,
slidericon,
text: $(text),
canvasctx: canvas.getcontext('2d'),
blockctx: block.getcontext('2d')
})
};
_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' : 'overlay'
}
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);
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.$element);
});
var originx, originy, trail = [],
ismousedown = false
var handledragstart = function (e) {
if (that.text.hasclass('text-danger')) return;
originx = e.clientx || e.touches[0].clientx;
originy = e.clienty || e.touches[0].clienty;
ismousedown = true;
};
var handledragmove = function (e) {
if (!ismousedown) return false;
var eventx = e.clientx || e.touches[0].clientx;
var eventy = e.clienty || e.touches[0].clienty;
var movex = eventx - originx;
var movey = eventy - originy;
if (movex < 0 || movex + 40 > that.options.width) return false;
that.slider.style.left = (movex - 1) + 'px';
var blockleft = (that.options.width - 40 - 20) / (that.options.width - 40) * movex;
that.block.style.left = blockleft + 'px';
that.slidercontainer.addclass('slidercontainer_active');
that.slidermask.style.width = (movex + 4) + 'px';
trail.push(movey);
};
var handledragend = function (e) {
if (!ismousedown) return false
ismousedown = false
var eventx = e.clientx || e.changedtouches[0].clientx
if (eventx == originx) return false
that.slidercontainer.removeclass('slidercontainer_active');
that.trail = trail
var {
spliced,
verified
} = that.verify()
if (spliced && verified) {
that.slidercontainer.addclass('slidercontainer_success');
if ($.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(() => {
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; });
};
_proto.verify = function () {
var sum = function (x, y) { return x + y; };
var square = function (x) { return x * x; };
var arr = this.trail // 拖动时y轴的移动距离
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);
var left = parseint(this.block.style.left);
return {
spliced: math.abs(left - this.x) < this.options.offset,
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
}
};
_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();
};
})(jquery);
附录1：需要注意css和js的引用路径；
总结
以上所述是小编给大家介绍的html+jquery实现拖动滑块图片拼图验证码插件希望对大家有所帮助
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