跨浏览器在客户端检查文件大小，然后将其上传到服务器？ [英] Cross-browser checking on file size at client side before uploading it to the server?

问题描述

客户端验证对于提高可用性非常重要。

是否有任何跨浏览器方法来验证文件大小，然后将其上传到服务器。我使用asp.net文件上传控件。

我发现一些第三方控件可以检查：

http://ajaxuploader.com/Demo/simple-upload.aspx p>

和

http://demo.essentialobjects.com/Default.aspx?path=AJAXU

但是如何？

解决方案

以前，在文件发送到服务器之前确定文件大小的唯一方法是使用thick than javascript侧插件/附加组件。这些必须安装在客户端系统上。例如。使用SWFUpload，Java applet，ActiveX控件。

现在，您可以使用HTML5 File API，例如：

  var size = document.getElementById（'myfile'）。files [0] .size; 
  

Client side validation is important to improve usability.

Is there any cross-browser way to validate the file size before uploading it to the server. I am using asp.net file upload control.

I found some third-party controls do that check:

http://ajaxuploader.com/Demo/simple-upload.aspx

and

http://demo.essentialobjects.com/Default.aspx?path=AJAXU

but How?

解决方案

Previously, the only way to determine the filesize before the file was sent over to the server was to have 'thicker than javascript' client-side plugins/add-ons. These would have to be installed on the client system. E.g. using SWFUpload, Java applets, ActiveX controls.

Now, you can use the HTML5 File API, i.e.:

var size = document.getElementById('myfile').files[0].size;

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