VBScript Reference Manual for InduSoft Web Studio

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VBScript Reference Manual InduSoft Web Studio Graphics Script The Graphics Script is located in the Graphics Worksheet folder. Procedures and Variables declared in the Graphics Script interface are available locally but are not accessible by any Screen Script interface, or from any other VBScript interface within IWS. Procedures and Variables declared in a Screen Script interface are not accessible by the Graphics Script. If common Procedure(s) are required, they should be put into the Global Procedures interface. Note that the Graphics Script is scanned (processed) by IWS before the Screen Scripts. The Graphics Script has three different pre-configured subroutines to execute VBScript code. These subroutines execute the VBScript contained in them based on the event state of the Graphics Module. These are: Graphics_OnStart Code contained within this subroutine is automatically executed just once when the Graphics Module is started. This is a good area to initialize variables or execute start-up code. Graphics_WhileRunning Code contained within this subroutine is automatically executed continuously while the Graphics Module is running. The rate at which this subroutine is called depends on the performance of the hardware platform and other tasks running at the time. Graphics_OnEnd Code contained within this subroutine is automatically executed just once when the Graphics Module is closed. Graphic Script Icon in Graphics Worksheet folder VBScript Interface Key Notes: • Do not change the name of the pre-configured subroutines in the VBScript interface. Otherwise they many not properly execute. 46 InduSoft, Ltd.
InduSoft Web Studio VBScript Reference Manual The Graphics Script operates for both the Server (the host processor where the IWS application is running) and Web Thin Clients (web browser interface using Microsoft Internet Explorer). For the Server, the Graphics module is the Viewer task (the display on the host processor), while the ISSymbol control is the Graphics module for Web Thin Clients. The operation of the Graphics Script on the Server is described above, and starts when the application is started on the Server, assuming there are one or more screens. But since Web Thin Clients can log on at any time after the Server is started, the functioning of the Graphics Script is different for Web Thin Clients and is independent of the operation of the Graphics Script on the host Server. Web Thin Client operation is as follows: • When a Web Thin Client logs on to the Server, following completion of the log on process, the Graphics_OnStart subroutine will be executed for the Web Thin Client. This will occur each time any new Web Thin Client logs on to the Server. • Following completion of the execution of the Graphics_OnStart subroutine, the Graphics_WhileRunning subroutine will be executed for as long as the Web Thin Client (browser) hosts the ISSymbol control (i.e. while an active network link exists and the ISSymbol is active in the browser). • When the Web Thin Client is shut down or when the ISSymbol control is no longer hosted by the browser, the Graphics_OnEnd subroutine is executed Screen Scripts Screen Scripts are associated with individual graphical screens. These screens can be for display on the host Server (where the IWS application is running), for a Web Thin Client, or both. Procedures and Variables declared in a Screen Script VBScript interface are not accessible by any other VBScript interface within IWS. However, the Screen Script interface can access procedures declared in the Global Procedures script interface. Screen subfolder in Graphics Worksheet folder VBScript Interface InduSoft, Ltd. 47
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VBScript Reference Manual for InduSoft Web Studio

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