Reading a file after it has been successfully uploaded to a server

Implemented HTML code to receive a file and send it to the server. However, I prefer to keep the data on the client side instead of the server. How can I achieve this while still being able to access the data? The solution needs to be compatible with IE8 or at least IE9. On the client side, I'm using Javascript and KnockoutJS, while on the server side, C#/asp.net MVC is being utilized.

This is how the file is currently sent to the server. As it's a POST Method, I assume there should be a way to return something. Perhaps I am misunderstanding its usage.

@using (Html.BeginForm("loadReport", "home", FormMethod.Post, new {enctype="multipart/form-data"})){ 

 <input type="file" name="FileUpload1" /><br />
 <input type="submit" name="Submit" id="Submit" value="Upload" />}


    public ActionResult loadReport()
    {
        foreach (string upload in Request.Files)
        {
            //     if (!Request.Files[upload].HasFile()) continue;
            string path = AppDomain.CurrentDomain.BaseDirectory;
            string filename = Path.GetFileName(Request.Files[upload].FileName);
            Request.Files[upload].SaveAs(Path.Combine(path, filename));
            System.Diagnostics.Debug.WriteLine(Path.GetFileName(Request.Files[upload].FileName));
        }
        return this.Json(new { });
    }

The above snippets are from a blog post that explains how to upload files to the server. Instead of returning JSON data, they returned a view. Testing this method led to a new page loading rather than receiving a JSON file for my Javascript.

Answer №1

When you upload a file to the server, it remains stored on the server and cannot be accessed directly from the client side unless
1.) You read the content of the file from the server side during page rendering and display it.
2.) Utilize AJAX to request the file's content and then manipulate the result using JavaScript.

Therefore, once the file is saved, you can use AJAX to fetch its content or reload the page and inject the file's content into the rendered page.

I hope this explanation clarifies any confusion and proves to be helpful.

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