JS problem

[Eugeniusz Rink]

Hi. I have a problem running JS.

script1:=
'  function WebSocketPrinter(options) { '+
'    var defaults = { '+
'        url: "ws://127.0.0.1:12212/printer", '+
'        onConnect: function () { '+
'        }, '+
'        onDisconnect: function () { '+
'        }, '+
'        onUpdate: function () { '+
'        }, '+
'    }; '+
'    var settings = Object.assign({}, defaults, options); '+
'    var websocket; '+
'    var connected = false; '+
'    var onMessage = function (evt) { '+
'        settings.onUpdate(evt.data); '+
'    }; '+
'    var onConnect = function () { '+
'        connected = true; '+
'        settings.onConnect(); '+
'    }; '+
'    var onDisconnect = function () { '+
'        connected = false; '+
'        settings.onDisconnect(); '+
'        reconnect(); '+
'    }; '+
'    var connect = function () { '+
'        websocket = new WebSocket(settings.url); '+
'        websocket.onopen = onConnect; '+
'        websocket.onclose = onDisconnect; '+
'        websocket.onmessage = onMessage; '+
'    }; '+
'    var reconnect = function () { '+
'        connect(); '+
'    }; '+
'    this.submit = function (data) { '+
'        if (Array.isArray(data)) { '+
'            data.forEach(function (element) { '+
'               websocket.send(JSON.stringify(element)); '+
'            }); '+
'        } else { '+
'            websocket.send(JSON.stringify(data)); '+
'        } '+
'    }; '+
'    this.isConnected = function () { '+
'        return connected; '+
'    }; '+
'    connect(); '+
'} ' +
'    var printService = new WebSocketPrinter(); '+
'    function printPDFBase64(typ,pdfbase64) { '+
'        printService.submit({ '+
'            ''type'': typ, '+
'            ''url'': ''tuxmed.pdf'', '+
'            ''file_content'': pdfbase64 '+
'        }); '+
'    } ';

UniSession.AddJS(script1);

I trigger a function with parameters:

UniSession.AddJS('printPDFBase64("'+UniApplication.Parameters.Values['gabinet']+'","'+pdf_base64+'")');

 

I get this error:

 

 

[Hayri ASLAN]

You need to make sure you are connected to websocket before sending the message

[Eugeniusz Rink]

10 minutes ago, Hayri ASLAN said:

You need to make sure you are connected to websocket before sending the message

If I add a script definition in UniServerModule: CustomFiles:='files/rs/js/websocket-printer.js'
run the function: UniSession.AddJS('printPDFBase64("'+UniApplication.Parameters.Values['office']+'","'+pdf_base64+'")'); It works properly and without errors... But this does not solve the problem, because I have to change the server port for each logging user. I need to change this entry in the JS script: url: "ws://127.0.0.1:12212/printer".

[Eugeniusz Rink]

Problem solved.
Below I show how I did it. This is a way to silently print PDF documents. I used the project: https://github.com/imTigger/webapp-hardware-bridge
You install the Windows client: https://github.com/imTigger/webapp-hardware-bridge/releases/tag/0.14.0

In the Delphi code:

function LoadJavaScriptFromFile(const FileName: string): string;
var
  FileStream: TFileStream;
  StreamSize: Int64;
  Buffer: AnsiString;
begin
  Result := '';
  FileStream := TFileStream.Create(FileName, fmOpenRead or fmShareDenyNone);
  try
    StreamSize := FileStream.Size;
    SetLength(Buffer, StreamSize);
    FileStream.Read(Buffer[1], StreamSize);
    Result := String(Buffer);
  finally
    FileStream.Free;
  end;
end;

[...]

var 

JavaScriptCode: String;

[...]

JavaScriptCode := LoadJavaScriptFromFile(UniServerModule.StartPath+'files\res\js\websocket-printer.js');
JavaScriptCode := StringReplace(JavaScriptCode, '$url$', '"ws://127.0.0.1:12213/printer"', [rfReplaceAll]);
JavaScriptCode := StringReplace(JavaScriptCode, '$typ$', ''''+UniApplication.Parameters.Values['gabinet']+'''', [rfReplaceAll]);
JavaScriptCode := StringReplace(JavaScriptCode, '$pdfbase64$', ''''+pdf_base64+'''', [rfReplaceAll]);
UniSession.AddJS(JavaScriptCode);

 

Of course, adapt the variables to your needs. The PDF file must be converted to Base64 without line-ending enters.

 

websocket-printer.js