我正在试用签名板并设置其中一个示例。但我不知道如何将图像保存为 jpeg 或类似格式。
我正在尝试保存图像，然后将其显示在占位符中，这样我就可以看到它是否有效。
下面是我的代码:
默认.aspx
<head runat="server">
<script src="scripts/jquery.min.js"></script>
<script src="scripts/jquery.signaturepad.min.js"></script>
<script src="scripts/json2.min.js"></script>
<link rel="stylesheet" href="scripts/jquery.signaturepad.css"/>
<script type="text/javascript">
$(document).ready(function () {
$('.sigPad').signaturePad({ drawOnly: true });
});
</script>
<title></title>
</head>
<body>
<form id="form1" runat="server" class="sigPad">
<label for="name">Print your name</label>
<input type="text" name="name" id="name" class="name"/>
<p class="drawItDesc">Draw your signature</p>
<ul class="sigNav">
<li class="drawIt"><a href="#draw-it">Draw It</a></li>
<li class="clearButton"><a href="#clear">Clear</a></li>
</ul>
<div class="sig sigWrapper">
<div class="typed"></div>
<canvas class="pad" width="198" height="55"></canvas>
<input type="hidden" name="output" class="output"/>
</div>
<button type="submit">I accept the terms of this agreement.</button>
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
</form>
</body>
</html>
Default.aspx.cs
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
var sigToImg = new SignatureToImage();
var signatureImage = sigToImg.SigJsonToImage(signatureJson);
// I want to be able to add the image to Placeholder1 after the post back
}
}
最佳答案
//HTML5
<div id="sketch" style="width: 400px; height: 245px; border: 1px solid #999999;float:left">
<canvas id="signature"></canvas>
</div>
//Javascript
var mycanvas = document.getElementById("signature"); //get your canvas
var image = mycanvas.toDataURL("image/png"); //Convert
document.getElementById("imgsaveSignature").src = image;
document.getElementById("imgsaveSignature").style.display = "inline";
image = image.replace('data:image/png;base64,', '');
document.getElementById("hdnSignatureImageData").value = image;
//in the code behind
Using fs As New FileStream(SignatureImgPath, FileMode.Create)
Using bw As New BinaryWriter(fs)
Dim data As Byte() = Convert.FromBase64String(hdnSignatureImageData.Value)
bw.Write(data)
bw.Close()
End Using
fs.Close()
End Using
关于c# - 签名板保存图像，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19303285/