B4J Question [WebApp] submit and refresh page

[jinyistudio]

Hi

1. I try upload a file to b4j server. file can upload but why the page is refreshing every time. Could i stop refreshing page when i click the submit button ?

2. cloud i assigned a filename in FileUploaded ? following code is save as a tempfile name.

html code

<div class="form-group">
                   <label for="inputEmail">公司Logo檔(max size 100kb)</label>
                   <form id="uploadfileform" action="filehelper" method="post" enctype="multipart/form-data" >
                    <div class="form-inline">
                        <div class="col-sm-10">                          
                               <input type="file" name="uploadfileform" id="logo1">
                           </div>
                        <input type="submit" name="submit" value="Upload">                          
                       </div>
                   </form>
            </div>

B4j code

Sub Handle(req As ServletRequest, resp As ServletResponse)
    'get the callback module from the session (multiple modules can use this handler)
    Dim callback As Object = req.GetSession.GetAttribute("file_upload_sender")
   
    Try
        Dim data As Map = req.GetMultipartData(File.Combine(File.DirApp, "files"), 100000)
        CallSubDelayed2(callback, "FileUploaded", data)
    Catch
        CallSubDelayed2(callback, "FileError", LastException.Message)
        resp.SendError(500, LastException.Message)
    End Try
End Sub

Public Sub FileUploaded(parts As Map)
    Dim filePart As Part = parts.Get("uploadfileform")
    Dim s1 As String="File uploaded successfully: " & filePart.SubmittedFilename & _
        " size = " & NumberFormat(File.Size("", filePart.TempFile) / 1000, 0, 0) & "kb"
    WebUtils.bsAlert(bsalert,s1)   
    ' File.Delete("", filePart.TempFile)
    'ws.Flush 'this is a server event so we need to explicitly call Flush
End Sub

 

[Erel]

See the online example: https://b4x.com:51041/websocket_with_fileupload/index.html

It doesn't refresh the page.