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Friday, May 18, 2018
TMS WEB Core promises easy, fast and RAD component based web application development. For fast, real-time updates on a web page with light-weight server-communications, WebSockets are an ideal mechanism.
That is why TMS WEB Core also comes with a WebSocket client:
This is a non-visual component that makes it very easy to start using WebSocket based communication. Drop this component on the form, configure the WebSocket hostname & port and call WebSocketClient.Connect. When a connection is established, the OnConnect event is triggered. From the moment of connection, data sent by the WebSocket server is received via the event OnDataReceived. The signature of this event is:
procedure OnDataReceived(Sender: TObject; Origin: string; Data: TJSObject);
To create an online chat application using this WebSocket technology takes only a few configurations in the component to configure the WebSocket server and a couple of lines of code. There is the logic that performs the Connect & Disconnect:
procedure TWebForm1.Connect; begin if FConnected then begin WebSocketClient1.Disconnect; end else begin if WebEdit1.Text = '' then ShowMessage('Please enter a name first') else WebSocketClient1.Connect; end; end;
To send a message when connected, we simply send the message as color/sender/message pair via the WebSocketClient.Send() function. Each chat user can choose a color and messages from the user are displayed in his selected color:
procedure TWebForm1.SendMessage; var s: string; begin if FConnected and (WebEdit2.Text <> '') then begin s := TMSFNCColorPicker1.SelectedColor) + '~' + WebEdit1.Text + '~' + WebEdit2.Text; // limit message length s := Copy(s,1,256); WebSocketClient1.Send(TTMSFNCGraphics.ColorToHTML(s); WebEdit2.Text := ''; end; end;
procedure TWebForm1.WebSocketClient1DataReceived(Sender: TObject; Origin: string; Data: TJSObject); var it: TTMSFNCListBoxItem; sl: TStringList; s: String; n: string; c: TTMSFNCGraphicsColor; v: string; begin it := lst.Items.Add; s := Data.toString; sl := TStringList.Create; try TTMSFNCUtils.Split('~', s, sl); if sl.Count > 2 then begin c := TTMSFNCGraphics.HTMLToColor(sl); n := ''+sl+''; v := sl; it.Text := n + ' says:
' + v; it.TextColor := c; end; finally sl.Free; end; end;
There isn't much more to creating a chat application for your TMS WEB Core applications except of course to put a WebSocket server application on your server that can equally be written with Delphi. With TMS WEB Core we include a sample WebSocket server service application.
Thanks to TMS WEB Core, you can directly see the result of our demo in your favorite web browser, no need to install anything to explore! Head over to https://download.tmssoftware.com/tmsweb/demos/tmsweb_chatclient/ to start chatting.
TMS WEB Core chat client application running in the Chrome browser
TMS WEB Core chat client application running in the Safari browser on iPhone
Get started today: Technical previews of TMS WEB Core, TMS FNC UI web-enabled controls, web-enabled TMS XData, the first parts under the TMS RADical WEB umbrella are exclusively available now for all active TMS-ALL-ACCESS customers.
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