JavaScript function fails to execute when attempting to call it after opening email client with attachment

//deliver the email to the recipient in eml format
Response.ClearHeaders();
Response.Clear();
Response.Buffer = true;
Response.ContentType = "message/rfc822";
Response.AddHeader("content-length", bin.Length.ToString());
Response.AddHeader("content-disposition", "attachment; filename=\"email.eml\"");
Response.OutputStream.Write(bin, 0, bin.Length);
Response.Flush();
HttpContext.Current.ApplicationInstance.CompleteRequest();

//The JavaScript function call does not execute.                       
ClientScript.RegisterStartupScript(GetType(), Guid.NewGuid().ToString(), "closeLoading();", true);

Removing the code that sends users a .eml file allows everything to work smoothly. I am attempting to close a loading dialog after completing a process. This application, built with web forms in C#, is of an older version.

I trigger the Loading popup using a basic JavaScript command "loading.show();"

It appears that the ContentType may be causing issues. Any suggestions?

Appreciate any help.

javascriptc#asp.net

Answer №1

If a Javascript method is not firing, it could be due to the use of Response.Flush(); which prematurely ends the response life cycle.

To work around this issue, consider creating a new file with a `.ashx` extension specifically for handling email operations.

For example, you can create a file named DownloadMailHandler.ashx:

public class DownloadMailHandler : IHttpHandler  
{  
    public void ProcessRequest(HttpContext context)  
    {  
        var bin = null;//create email content
        context.Response.ClearHeaders();
        context.Response.Clear();
        context.Response.Buffer = true;
        context.Response.ContentType = "message/rfc822";
        context.Response.AddHeader("content-length", bin.Length.ToString());
        context.Response.AddHeader("content-disposition", "attachment; filename=\"email.eml\"");
        context.Response.OutputStream.Write(bin, 0, bin.Length);
        context.Response.Flush();
    }  
  
    public bool IsReusable  
    {  
        get  
        {  
            return false;  
        }  
    }  
}

To trigger the email download from your Javascript function, redirect to the `.ashx` file using the following code:

ClientScript.RegisterStartupScript(this.GetType(), Guid.NewGuid().ToString(), "closeLoading()", true);
Response.Redirect("DownloadMailHandler.ashx");

Please note that the method does not specify how the `bin` value is obtained, but you can pass parameters through the querystring to the `.ashx` file in order to create the `bin` object. See: Passing parameter from .aspx.cs to .ashx

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