如何保存html2canvas图像到系统文件夹中的jQuery [英] How to save html2canvas image into System Folder in jquery

问题描述

我有ID =这种形式，我有内部form1的形式的graph.Now我使用html2canvas得到这个form1.Here的形象是我的code ..

I have a form with id="form1" inside this form i have a graph.Now i am using html2canvas to get the image of this form1.Here is my code..

<script type="text/javascript">

      $(document).ready(function () {
          $('#add_button').click(function () {
              alert("hiii");
              $('form1').html2canvas();
              var queue = html2canvas.Parse();
              var canvas = html2canvas.Renderer(queue, { elements: { length: 1} });
              var img = canvas.toDataURL();
              window.open(img);
              alert("Hello");
          });
      });

  </script>

<form id="form1" runat="server">
<div style="padding-left:150px">
  <asp:Literal ID="FCLiteral1" runat="server"></asp:Literal>
</div>
<div style="padding-left:350px"><b>Demo</b></div>
</form>

 <input type="submit" id="add_button" value="Take Screenshot Of Div" " />

所以我的问题是如何能我这个图像保存到我的系统hardisk..Please帮我。

So my question is how can i save this image into my system hardisk..Please help me.

推荐答案

系统hardisk？我不明白，服务器或客户端？

System hardisk? I did not understand, server or client?

如果您希望用户自动下载图片，您将需要修改数据URI方案

If you want the user to download the image automatically, you will need to modify the Data URI scheme

试试这个：

添加在CSS

#myHideFrame {
    position: absolute;
    top: -9999px;
    width: 1px;
    height: 1px;
}

添加在Javascript

Add in Javascript

var img = canvas.toDataURL();
var frame = document.getElementById("myHideFrame");
if(!frame) {
    frame = document.createElement("iframe");
    frame.id = "myHideFrame";
    document.body.appendChild(frame);
}
frame.src = img.replace(/^data[:]image\/(png|jpg|jpeg)[;]/i, "data:application/octet-stream;");

不幸的是这个例子没有显示名字，为此，你将不得不做这样的事情（用户无需点击链接）：

Unfortunately this example does not show the name, for this you will have to do something like this (user need click in link):

var img = canvas.toDataURL();
var link = document.createElement("a");
link.download = "photo.png"; //Setup name file
link.href = img.replace(/^data[:]image\/(png|jpg|jpeg)[;]/i, "data:application/octet-stream;");
document.body.appendChild(link);

服务器

如果你想保存在服务器上，那么你需要使用阿贾克斯，例如使用jQuery：

SERVER

If you want to save on the server then you need to use Ajax, example with Jquery:

的Javascript文件，

Javascript file:

var img = canvas.toDataURL().replace(/^data[:]image\/(png|jpg|jpeg)[;]base64,/i, "");
$.ajax({
    "type": "POST",
    "url": "upload.aspx/UploadImage",
    "data": { 
        "imageData": img //Send to WebMethod
    }
}).done(function(o) {
    console.log(["Response:" , o]); 
});

您upload.aspx.cs文件的需要：

Your upload.aspx.cs file need:

...
[WebMethod()]
public static void UploadImage(string imageData)
{
    string fileNameWitPath = "custom_name.png";
    using (FileStream fs = new FileStream(fileNameWitPath, FileMode.Create))
    {
        using (BinaryWriter bw = new BinaryWriter(fs))
        {
            byte[] data = Convert.FromBase64String(imageData);//convert from base64
            bw.Write(data);
            bw.Close();
        }
    }
}
...

查看详情：<一href=\"http://www.dotnetfunda.com/articles/show/1662/saving-html-5-canvas-as-image-on-the-server-using-aspnet\">http://www.dotnetfunda.com/articles/show/1662/saving-html-5-canvas-as-image-on-the-server-using-aspnet

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