javascript - Measure size of file uploaded using jQuery in ASP.NET

Question

How to measure file size using jquery,the following code works fine in firefox,chrome but it is not work in IE (7/8/9). Can any one help me how to measure file size in IE

var fi = document.getElementById('loadfile');
var sizeInMB = fi.files[0].size;
    sizeInMB = (sizeInMB / (1024 * 1024));
if (sizeInMB > 20)
    alert("File size more than 20MB");
else
    alert("File size less than 20MB");

Answer 1

试试这个方法：

<script runat="server">

    protected void UploadButton_Click(object sender, EventArgs e)
    {

        string savePath = @"c:\temp\uploads\";


        if (FileUpload1.HasFile)
        {                
            // Get the size in bytes of the file to upload.
            int fileSize = FileUpload1.PostedFile.ContentLength;

            // Allow only files less than 2,100,000 bytes (approximately 2 MB) to be uploaded.
            if (fileSize < 2100000)
            {

                // Append the name of the uploaded file to the path.
                savePath += Server.HtmlEncode(FileUpload1.FileName);


                FileUpload1.SaveAs(savePath);


                UploadStatusLabel.Text = "Your file was uploaded successfully.";
            }
            else
            {

                UploadStatusLabel.Text = "Your file was not uploaded because " + 
                                         "it exceeds the 2 MB size limit.";
            }
        }   
        else
        {

            UploadStatusLabel.Text = "You did not specify a file to upload.";
        }
    }
</script>