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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

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 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-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;
             92%;
        }

        html.touch #scrollgrabber {
            float: right;
             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">
            <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 = 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="~/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 === 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)

                $('<div><textarea style="100%;height:7em;"></textarea></div>').appendTo($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)

                    var datapair = $sigdiv.jSignature("getData", "image");
                    var len = $sigdiv.jSignature('getData', 'native').length;
                    if (len > 0) {
                        $.post(
                            "/Test/UploadSignature?dt=" + new Date(),
                            {
                                imgData: datapair[1]
                            }, 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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原文地址：https://www.cnblogs.com/LiChen19951127/p/10932300.html