html5手写签名的实现示例

月英 · 发表于 2024-1-12 10:58:11

前言

业务中需要用户进行签字，如何让用户在手机端进行签字？
示例如下

代码已分享至Gitee: https://gitee.com/lengcz/qianming
H5实现手写签字

创建一个html页面

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<!-- Always force latest IE rendering engine (even in intranet) & Chrome Frame
Remove this if you use the .htaccess -->
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="initial-scale=1.0, target-densitydpi=device-dpi" />
<meta name="viewport" content="initial-scale=1.0, width=device-height">
<script src="/js/modernizr.js"></script>
<!--[if lt IE 9]>
<script type="text/javascript" src="libs/flashcanvas.js"></script>
<![endif]-->
<style type="text/css">
div {
margin-top:1em;
margin-bottom:1em;
}
input {
padding: .5em;
margin: .5em;
}
select {
padding: .5em;
margin: .5em;
}
#signatureparent {
color:darkblue;
background-color:darkgrey;
/*max-width:600px;*/
padding:20px;
}
/*This is the div within which the signature canvas is fitted*/
#signature {
border: 2px dotted black;
background-color:lightgrey;
}
/* Drawing the 'gripper' for touch-enabled devices */
html.touch #content {
float:left;
width:92%;
}
html.touch #scrollgrabber {
float:right;
width:4%;
margin-right:2%;
background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAFCAAAAACh79lDAAAAAXNSR0IArs4c6QAAABJJREFUCB1jmMmQxjCT4T/DfwAPLgOXlrt3IwAAAABJRU5ErkJggg==)
}
html.borderradius #scrollgrabber {
border-radius: 1em;
}
</style>
</head>
<body>
<div>
<div id="content">
<div id="signatureparent">
<div>jSignature inherits colors from parent element. Text = Pen color. Background = Background. (This works even when Flash-based Canvas emulation is used.)</div>
<div id="signature"></div></div>
<div id="tools"></div>
<div><p>Display Area:</p><div id="displayarea"></div></div>
</div>
<div id="scrollgrabber"></div>
</div>
<script src="/js/jquery-3.2.1.min.js"></script>
<script type="text/javascript">
jQuery.noConflict()
</script>
<script>
/* @preserve
jQuery pub/sub plugin by Peter Higgins (dante@dojotoolkit.org)
Loosely based on Dojo publish/subscribe API, limited in scope. Rewritten blindly.
Original is (c) Dojo Foundation 2004-2010. Released under either AFL or new BSD, see:
http://dojofoundation.org/license for more information.
*/
(function($) {
var topics = {};
$.publish = function(topic, args) {
if (topics[topic]) {
var currentTopic = topics[topic],
args = args || {};
for (var i = 0, j = currentTopic.length; i < j; i++) {
currentTopic[i].call($, args);
}
}
};
$.subscribe = function(topic, callback) {
if (!topics[topic]) {
topics[topic] = [];
}
topics[topic].push(callback);
return {
"topic": topic,
"callback": callback
};
};
$.unsubscribe = function(handle) {
var topic = handle.topic;
if (topics[topic]) {
var currentTopic = topics[topic];
for (var i = 0, j = currentTopic.length; i < j; i++) {
if (currentTopic[i] === handle.callback) {
currentTopic.splice(i, 1);
}
}
}
};
})(jQuery);
</script>
<script src="/js/jSignature.min.noconflict.js"></script>
<script>
(function($){
$(document).ready(function() {
// This is the part where jSignature is initialized.
var $sigdiv = $("#signature").jSignature({'UndoButton':true})
// All the code below is just code driving the demo.
, $tools = $('#tools')
, $extraarea = $('#displayarea')
, pubsubprefix = 'jSignature.demo.'
var export_plugins = $sigdiv.jSignature('listPlugins','export')
, chops = ['<span><b>提取签名数据: </b></span><select>','<option value="">(select export format)</option>']
, name
for(var i in export_plugins){
if (export_plugins.hasOwnProperty(i)){
name = export_plugins[i]
chops.push('<option value="' + name + '">' + name + '</option>')
}
}
chops.push('</select><span><b> or: </b></span>')
$(chops.join('')).bind('change', function(e){
if (e.target.value !== ''){
var data = $sigdiv.jSignature('getData', e.target.value)
$.publish(pubsubprefix + 'formatchanged')
if (typeof data === 'string'){
$('textarea', $tools).val(data)
} else if($.isArray(data) && data.length === 2){
$('textarea', $tools).val(data.join(','))
$.publish(pubsubprefix + data[0], data);
} else {
try {
$('textarea', $tools).val(JSON.stringify(data))
} catch (ex) {
$('textarea', $tools).val('Not sure how to stringify this, likely binary, format.')
}
}
}
}).appendTo($tools)
$('<input type="button" value="Reset">').bind('click', function(e){
$sigdiv.jSignature('reset')
}).appendTo($tools)
$('<div><textarea style="width:100%;height:7em;"></textarea></div>').appendTo($tools)
$.subscribe(pubsubprefix + 'formatchanged', function(){
$extraarea.html('')
})
$.subscribe(pubsubprefix + 'image/svg+xml', function(data) {
try{
var i = new Image()
i.src = 'data:' + data[0] + ';base64,' + btoa( data[1] )
$(i).appendTo($extraarea)
} catch (ex) {
}
var message = [
"If you don't see an image immediately above, it means your browser is unable to display in-line (data-url-formatted) SVG."
, "This is NOT an issue with jSignature, as we can export proper SVG document regardless of browser's ability to display it."
, "Try this page in a modern browser to see the SVG on the page, or export data as plain SVG, save to disk as text file and view in any SVG-capabale viewer."
]
$( "<div>" + message.join("<br/>") + "</div>" ).appendTo( $extraarea )
});
$.subscribe(pubsubprefix + 'image/svg+xml;base64', function(data) {
var i = new Image()
i.src = 'data:' + data[0] + ',' + data[1]
$(i).appendTo($extraarea)
var message = [
"If you don't see an image immediately above, it means your browser is unable to display in-line (data-url-formatted) SVG."
, "This is NOT an issue with jSignature, as we can export proper SVG document regardless of browser's ability to display it."
, "Try this page in a modern browser to see the SVG on the page, or export data as plain SVG, save to disk as text file and view in any SVG-capabale viewer."
]
$( "<div>" + message.join("<br/>") + "</div>" ).appendTo( $extraarea )
});
$.subscribe(pubsubprefix + 'image/png;base64', function(data) {
var i = new Image()
i.src = 'data:' + data[0] + ',' + data[1]
$('<span><b>As you can see, one of the problems of "image" extraction (besides not working on some old Androids, elsewhere) is that it extracts A LOT OF DATA and includes all the decoration that is not part of the signature.</b></span>').appendTo($extraarea)
$(i).appendTo($extraarea)
});
$.subscribe(pubsubprefix + 'image/jsignature;base30', function(data) {
$('<span><b>This is a vector format not natively render-able by browsers. Format is a compressed "movement coordinates arrays" structure tuned for use server-side. The bonus of this format is its tiny storage footprint and ease of deriving rendering instructions in programmatic, iterative manner.</b></span>').appendTo($extraarea)
});
if (Modernizr.touch){
$('#scrollgrabber').height($('#content').height())
}
})
})(jQuery)
</script>
</body>
</html>

复制代码

modernizr.js

/* Modernizr 2.5.2 (Custom Build) | MIT & BSD
* Build: http://www.modernizr.com/download/#-borderradius-csscolumns-canvas-touch-mq-cssclasses-addtest-teststyles-testprop-testallprops-prefixes-domprefixes-fullscreen_api
*/
;window.Modernizr = function(a, b, c) {
function A(a) {
j.cssText = a
}
function B(a, b) {
return A(m.join(a + ";") + (b || ""))
}
function C(a, b) {
return typeof a === b
}
function D(a, b) {
return !!~("" + a).indexOf(b)
}
function E(a, b) {
for (var d in a)
if (j[a[d]] !== c)
return b == "pfx" ? a[d] : !0;
return !1
}
function F(a, b, d) {
for (var e in a) {
var f = b[a[e]];
if (f !== c)
return d === !1 ? a[e] : C(f, "function") ? f.bind(d || b) : f
}
return !1
}
function G(a, b, c) {
var d = a.charAt(0).toUpperCase() + a.substr(1)
, e = (a + " " + o.join(d + " ") + d).split(" ");
return C(b, "string") || C(b, "undefined") ? E(e, b) : (e = (a + " " + p.join(d + " ") + d).split(" "),
F(e, b, c))
}
var d = "2.5.2", e = {}, f = !0, g = b.documentElement, h = "modernizr", i = b.createElement(h), j = i.style, k, l = {}.toString, m = " -webkit- -moz- -o- -ms- ".split(" "), n = "Webkit Moz O ms", o = n.split(" "), p = n.toLowerCase().split(" "), q = {}, r = {}, s = {}, t = [], u = t.slice, v, w = function(a, c, d, e) {
var f, i, j, k = b.createElement("div"), l = b.body, m = l ? l : b.createElement("body");
if (parseInt(d, 10))
while (d--)
j = b.createElement("div"),
j.id = e ? e[d] : h + (d + 1),
k.appendChild(j);
return f = ["", "<style>", a, "</style>"].join(""),
k.id = h,
m.innerHTML += f,
m.appendChild(k),
l || g.appendChild(m),
i = c(k, a),
l ? k.parentNode.removeChild(k) : m.parentNode.removeChild(m),
!!i
}, x = function(b) {
var c = a.matchMedia || a.msMatchMedia;
if (c)
return c(b).matches;
var d;
return w("@media " + b + " { #" + h + " { position: absolute; } }", function(b) {
d = (a.getComputedStyle ? getComputedStyle(b, null) : b.currentStyle)["position"] == "absolute"
}),
d
}, y = {}.hasOwnProperty, z;
!C(y, "undefined") && !C(y.call, "undefined") ? z = function(a, b) {
return y.call(a, b)
}
: z = function(a, b) {
return b in a && C(a.constructor.prototype[b], "undefined")
}
,
Function.prototype.bind || (Function.prototype.bind = function(b) {
var c = this;
if (typeof c != "function")
throw new TypeError;
var d = u.call(arguments, 1)
, e = function() {
if (this instanceof e) {
var a = function() {};
a.prototype = c.prototype;
var f = new a
, g = c.apply(f, d.concat(u.call(arguments)));
return Object(g) === g ? g : f
}
return c.apply(b, d.concat(u.call(arguments)))
};
return e
}
);
var H = function(c, d) {
var f = c.join("")
, g = d.length;
w(f, function(c, d) {
var f = b.styleSheets[b.styleSheets.length - 1]
, h = f ? f.cssRules && f.cssRules[0] ? f.cssRules[0].cssText : f.cssText || "" : ""
, i = c.childNodes
, j = {};
while (g--)
j[i[g].id] = i[g];
e.touch = "ontouchstart"in a || a.DocumentTouch && b instanceof DocumentTouch || (j.touch && j.touch.offsetTop) === 9
}, g, d)
}([, ["@media (", m.join("touch-enabled),("), h, ")", "{#touch{top:9px;position:absolute}}"].join("")], [, "touch"]);
q.canvas = function() {
var a = b.createElement("canvas");
return !!a.getContext && !!a.getContext("2d")
}
,
q.touch = function() {
return e.touch
}
,
q.borderradius = function() {
return G("borderRadius")
}
,
q.csscolumns = function() {
return G("columnCount")
}
;
for (var I in q)
z(q, I) && (v = I.toLowerCase(),
e[v] = q[I](),
t.push((e[v] ? "" : "no-") + v));
return e.addTest = function(a, b) {
if (typeof a == "object")
for (var d in a)
z(a, d) && e.addTest(d, a[d]);
else {
a = a.toLowerCase();
if (e[a] !== c)
return e;
b = typeof b == "function" ? b() : b,
g.className += " " + (b ? "" : "no-") + a,
e[a] = b
}
return e
}
,
A(""),
i = k = null,
e._version = d,
e._prefixes = m,
e._domPrefixes = p,
e._cssomPrefixes = o,
e.mq = x,
e.testProp = function(a) {
return E([a])
}
,
e.testAllProps = G,
e.testStyles = w,
g.className = g.className.replace(/(^|\s)no-js(\s|$)/, "$1$2") + (f ? " js " + t.join(" ") : ""),
e
}(this, this.document),
Modernizr.addTest("fullscreen", function() {
for (var a = 0; a < Modernizr._domPrefixes.length; a++)
if (document[Modernizr._domPrefixes[a].toLowerCase() + "CancelFullScreen"])
return !0;
return !!document.cancelFullScreen || !1
});

复制代码

运行测试用例

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html5手写签名的实现示例

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