Web presentation engine¶

BrowseName: PresentationEngine
SuperType: Presentation engine (PresentationEngine)
TypeView path: Tipi > UI > Web presentation engine

When a client connects at runtime to the specified web server URL, generate an interactive session for the authenticated user.

Applications

This Presentation engine is used for both typical HMI applications to run on targets with an operator panel and for blind devices, when we want to make available a web user interface to which multiple users can be connected from different web browsers. In a project there can only be one of them.

When a client connects to the web server, the object generates an interactive session (see Sessions and locale) for the authenticated user. The same user can access the project from multiple devices, and for each the object generates an additional interactive session. In every session the initial window set is created.

Use the object at runtime

Display the user interface from the browser

With the application running, navigate to the address listed in the Endpoint URL property.

Display a specific window using shortcut

To directly display a specific window among those available in the project (Window objects children of the UI folder), add the path /windows/ followed by the BrowseName of the desired window to the URL (e.g.: localhost:8843/windows/Window02).

Tip

this shortcut is particularly useful in a scenario where multiple clients connect to the same web server to display a different window to each of them.

Properties¶

Name	BrowseName	DataType	Description
Dynamic variables polling time	DynamicVariablesPollingTime	Duration	Time interval for the periodic reading of the dynamic link source field variables.
Protocol	Protocol	Protocol
IP address	IPAddress	String
Port	Port	UInt16
Hostname	Hostname	String
Maximum number of connections	MaxNumberOfConnections	UInt32	Maximum number of clients that can connect to the web server
Start window	StartWindow	NodeId	Type of start Window object to create at the start of the session. (Inherited from Presentation engine)
Style sheet	StyleSheet	NodeId	Set the styles of graphical objects, either globally or for specific object classes. (Inherited from Presentation engine)
Enable virtual keyboard	EnableVirtualKeyboard	Boolean	Enable/disable the virtual keyboard. (Inherited from Presentation engine)
Starting user	StartingUser	NodeId	The starting user with which to authenticate the session. (Inherited from Presentation engine)
Session	Session	NodeId	(Inherited from Presentation engine)
	Sessions	Collection of UISession	(Inherited from Presentation engine)