B4J Question How to open a new tab by viewing a pdf file using B4J as Web Server

[Gabino A. de la Gala]

I am using bj4 as a web server.
I have a web page with three buttons and every time I click on one of these buttons I launch the EjecutarTWP(params) process.

This process, what it does is to execute an external application using JShell that generates a pdf file with the desired results.

What I would like to achieve is that after generating the pdf file it will show it to me in an additional browser tab.

Sub EjecutarTWP(Parametros As Map) As String
    Dim jsEjecutarTWP As Shell
    jsEjecutarTWP.Initialize("jsEjecutarTWP", FileRun, params)
    jsEjecutarTWP.WorkingDirectory = Main.settings.Get("PathMyrtusF")
    jsEjecutarTWP.Run(-1)
    Return Parametros.Get("FicheroDestino")
End Sub

Sub jsEjecutarTWP_ProcessCompleted (Success As Boolean, ExitCode As Int, StdOut As String, StdErr As String)
    If Success And ExitCode = 0 Then
        Log("Success")
        Log(StdOut)
        Dim j As HttpJob
        j.Initialize("j", Me)
        j.PostString("http://127.0.0.1:51042/login_example/members/downloadpdf", "FicheroDestino=" & ParamsAux.Get("FicheroDestino") & "&CarpetaDestino=" & ParamsAux.Get("CarpetaDestino"))
        StartMessageLoop
    Else
        Log("Error: " & StdErr)
    End If
End Sub

Sub JobDone(j As HttpJob)
    If j.success Then
        Log(j.Success)       
    Else
        Log(j.errorMessage)
    End If
    j.Release
    StopMessageLoop
End Sub

 

[Erel]

This is the server code, right?

Why are you making a http request from the server?

 

[Gabino A. de la Gala]

This is the server code, right?

Why are you making a http request from the server?

In my land there is a saying: The one you don't know as the one who doesn't see ...

They are blind sticks that I am giving to see if I find a way to open a new tab in the client's browser showing the content of the generated PDF.

Is there any way to do it from the server side?

From the html part I do something similar with the following script

<script>
    $( document ).ready(function() {
        // Configuro lo correspondiente a la pulsación del botón 1
        $("#btn1").click(function(e) {
            e.preventDefault();
            $.ajax({
                type: "POST",
                url: "membersHandler",
                data: jQuery.param({ Opcion : "btn1", field2 : "hello2"}), 
               success: function(result)
               {
                   if (result.success) {
                        //window.location  = 'showpdf.html';
                        // Con esta opción hago que el pdf lo abra en una pestaña nueva...
                        setTimeout(function(){
                            window.open(result.PDFGenerado);
                        }, 1000);
                   }
                   else {
                        alert(result.errorMessage);
                   }
               },
                error: function (xhr, ajaxOptions, thrownError) {
                    alert(thrownError);
                }
            });
        });
    });
    </script>

But there are times that it takes to generate the pdf longer than expected and then it gives a 404 error.

That's why I thought it would be more reliable to open the pdf in the _Completed event of the server.

 

[rraswisak]

in html file usually i call target="_blank" for the url to be opened in new tab, don't know if this will work on jquery as well in your case. so you can try to change this:

window.open(result.PDFGenerado);

to

window.open(result.PDFGenerado, '_blank');