如何在数据库中保存数字签名 [英] How to save digital signature in database
本文介绍了如何在数据库中保存数字签名的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有使用canvas进行签名控制的代码，我想将其存储在DB中
请帮帮我。
这里是我的代码
I have code for signature control using canvas, i want to store that in DB
please help me.
here is my code
<pre lang="text"><pre lang="text"><pre lang="text"><pre lang="text"><pre lang="text"><pre lang="text"><pre lang="HTML"><pre lang="HTML">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function loaded() {
var signature = new ns.SignatureControl({
containerId: 'container', callback: function () {
alert('hello');
}
});
signature.init();
}
window.addEventListener('DOMContentLoaded', loaded, false);
</script>
<script type="text/javascript">
(function (ns) {
// "use strict";
ns.SignatureControl = function (options) {
var containerId = options && options.canvasId || "container",
callback = options && options.callback || {},
label = options && options.label || "Signature",
cWidth = options && options.width || "300px",
cHeight = options && options.height || "300px",
btnClearId,
btnAcceptId,
canvas,
ctx;
function initCotnrol() {
createControlElements();
wireButtonEvents();
canvas = document.getElementById("signatureCanvas");
canvas.addEventListener("mousedown", pointerDown, false);
canvas.addEventListener("mouseup", pointerUp, false);
ctx = canvas.getContext("2d");
}
function createControlElements() {
var signatureArea = document.createElement("div"),
labelDiv = document.createElement("div"),
canvasDiv = document.createElement("div"),
canvasElement = document.createElement("canvas"),
buttonsContainer = document.createElement("div"),
buttonClear = document.createElement("button"),
buttonAccept = document.createElement("button");
labelDiv.className = "signatureLabel";
labelDiv.textContent = label;
canvasElement.id = "signatureCanvas";
canvasElement.clientWidth = cWidth;
canvasElement.clientHeight = cHeight;
canvasElement.style.border = "solid 2px black";
buttonClear.id = "btnClear";
buttonClear.textContent = "Clear";
buttonAccept.id = "btnAccept";
buttonAccept.textContent = "Accept";
canvasDiv.appendChild(canvasElement);
buttonsContainer.appendChild(buttonClear);
buttonsContainer.appendChild(buttonAccept);
signatureArea.className = "signatureArea";
signatureArea.appendChild(labelDiv);
signatureArea.appendChild(canvasDiv);
signatureArea.appendChild(buttonsContainer);
document.getElementById(containerId).appendChild(signatureArea);
}
function pointerDown(evt) {
ctx.beginPath();
ctx.moveTo(evt.offsetX, evt.offsetY);
canvas.addEventListener("mousemove", paint, false);
}
function pointerUp(evt) {
canvas.removeEventListener("mousemove", paint);
paint(evt);
}
function paint(evt) {
ctx.lineTo(evt.offsetX, evt.offsetY);
ctx.stroke();
}
function wireButtonEvents() {
var btnClear = document.getElementById("btnClear"),
btnAccept = document.getElementById("btnAccept");
btnClear.addEventListener("click", function () {
ctx.clearRect(0, 0, canvas.width, canvas.height);
}, false);
btnAccept.addEventListener("click", function () {
callback();
}, false);
}
function getSignatureImage() {
return ctx.getImageData(0, 0, canvas.width, canvas.height).data;
}
return {
init: initCotnrol,
getSignatureImage: getSignatureImage
};
}
})(this.ns = this.ns || {});
</script>
</head>
<body>
<form id="form1" runat="server">
<div id="container">
</div>
</form><pre lang="c#">
< / body>
< / html>
</body>
</html>
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