Jquery电子签名制作_jSignature
今天用Jquery的jSignature库制作一个电子签名 后台.net core上传到指定文件夹
下载jquery库 提取码:rd9g
html
@{
Layout = null;
}
<!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" /><!-- this is for mobile (Android) Chrome -->
<meta name="viewport" content="initial-scale=1.0, width=device-height"><!-- mobile Safari, FireFox, Opera Mobile -->
<script src="~/lib/jSignature-master/libs/modernizr.js"></script>
<!--[if lt IE ]>
<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: %;
}
html.touch #scrollgrabber {
float: right;
width: %;
margin-right: %;
background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAFCAAAAACh79lDAAAAAXNSR0IArs4c6QAAABJJREFUCB1jmMmQxjCT4T/DfwAPLgOXlrt3IwAAAABJRU5ErkJggg==)
}
html.borderradius #scrollgrabber {
border-radius: 1em;
}
</style>
</head>
<body>
<div>
<div id="content">
<input type="button" value="上传" onclick="add()" />
<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="http://www.jq22.com/jquery/jquery-1.10.2.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 = {};
$.publish = function(topic, args) {
if (topics[topic]) {
var currentTopic = topics[topic],
args = args || {};
for (var i = , j = currentTopic.length; i < j; i++) {
currentTopic[i].call($, args);
}
}
};
$.subscribe = function(topic, callback) {
if (!topics[topic]) {
topics[topic] = [];
}
topics[topic].push(callback);
return {
"topic": topic,
"callback": callback
};
};
$.unsubscribe = function(handle) {
var topic = handle.topic;
if (topics[topic]) {
var currentTopic = topics[topic];
for (var i = , j = currentTopic.length; i < j; i++) {
if (currentTopic[i] === handle.callback) {
currentTopic.splice(i, );
}
}
}
};
})(jQuery);
</script>
<script src="~/lib/jSignature-master/libs/jSignature.min.noconflict.js"></script>
<script>
(function ($) {
$(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 === ) {
$('textarea', $tools).val(data.join(','))
$.publish(pubsubprefix + data[], 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[] + ';base64,' + btoa(data[])
$(i).appendTo($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[] + ',' + data[]
$(i).appendTo($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[] + ',' + data[]
$('<span><b>As you can see, one of the problems of "image" extraction (besides not working on some old Androids, elsewhere) is that it extracts A LOT OF DATA and includes all the decoration that is not part of the signature.</b></span>').appendTo($extraarea)
$(i).appendTo($extraarea)
var datapair = $sigdiv.jSignature("getData", "image");
var len = $sigdiv.jSignature('getData', 'native').length;
if (len > ) {
$.post(
"/Test/UploadSignature?dt=" + new Date(),
{
imgData: datapair[]
}, function (res) {
if (res.success) {
alert('上传成功!');
} else {
alert(res.message);
}
}
)
}
else {
alert("请先签名")
}
});
$.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>
控制器
[HttpPost]
public async Task<IActionResult> UploadSignature()
{
string imgData = HttpContext.Request.Form["imgData"].ToString();
var result = new Dictionary<string, object>();
bool Success = false;
string Message = "";
try
{
var dir = @"./wwwroot/Signature/";
if (!Directory.Exists(dir))
Directory.CreateDirectory(dir); var fileName = Guid.NewGuid(); var path = dir + fileName + ".jpg"; //using (var fileStream = new FileStream(path, FileMode.Create))
//{
// await file.CopyToAsync(fileStream);
// await fileStream.FlushAsync();
//} byte[] arr = Convert.FromBase64String(imgData);
MemoryStream ms = new MemoryStream(arr);
await ms.FlushAsync();
System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(ms);
bmp.Save(path, System.Drawing.Imaging.ImageFormat.Jpeg);
ms.Close();
Success = true;
Message = path.Replace("./wwwroot", string.Empty);
}
catch (Exception ex)
{
Success = false;
Message = ex.Message;
}
result.Add("success", Success);
result.Add("message", Message);
return Json(result);
}
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