VBScript Reference Manual for InduSoft Web Studio

VBScript Reference Manual InduSoft Web Studio
VBScript with Web Thin Clients
In a Web Thin Client environment, the browser serves as the host for both HTML web pages published
by the IWS Server, as well as the host for VBScript code segments that are associated with a particular
Screen or object on the Screen. Generally, Microsoft Internet Explorer serves as the browser in a Web
Thin Client environment. A InduSoft ActiveX Control (ISSymbol) is used to coordinate communications
between the IWS Server and a Web Thin Client.
In a Windows XP/2000/NT-based Web Thin Client environment, Microsoft Internet Explorer (e.g.
Version 6 or later) supports VBScripts and ActiveX by default. In a Windows CE-based Web Thin Client
environment, Microsoft Internet Explorer (typically provided with PocketPC products) supports both
VBScript and ActiveX, but VBScript support must be enabled in the Windows CE image (part of the
Platform Build process, typically done by the hardware supplier). Windows CE systems with Microsoft
Pocket Explorer (different that Microsoft Internet Explorer) will not work with VBScript as Pocket
Explorer does not support VBScript due to memory limitations. Also remember that any ActiveX
controls used on a Windows CE Web Thin Client must be developed to support Windows CE.
VBScript Interface Functioning related to a Web Thin Client
Global Procedures
VBScript Global Procedures are accessible to VBScript code segments that
execute on a Web Thin Client
Graphics Module
Operates on IWS Server PC only. Procedures and Variables not accessible to a
Web Thin Client.
This VBScript interface (for a Web Page) executes independently from the
VBScript Interface for a Screen running on the IWS Server.
• The Graphics_OnStart() subroutine starts when the Web Thin Client
Station is successfully logged in and ISSymbol is hosted on the Web
Screen Scripts
•
Browser
The Graphics_WhileRunning() subroutine executes on the Web Thin Client
while the Web Thin Client remains logged in and the ISSymbol Control
remain hosted on the Web Browser
• The Graphics_OnEnd() subroutine is executed once the Web Thin Client
logs off or the ISSymbol Control is no longer hosted by the Web Browser
Command Dynamic
This VBScript interface (for a Web Page) executes independently from the
VBScript Interface for a Screen running on the IWS Server.
ActiveX Event Handler
This VBScript interface (for a Web Page) executes independently from the
VBScript Interface for a Screen running on the IWS Server.
Background Task Startup
Operates on IWS Server PC only. Procedures and Variables not accessible to a
Web Thin Client.
Background Task Scripts
Operates on IWS Server PC only. Procedures and Variables not accessible to a
Web Thin Client.
Key Notes:
• Under Windows XP/2000/NT, to check or modify Internet Explorer’s settings for support
of VBScript and ActiveX Controls, open Internet Explorer, then click on Tools ->
Internet Options -> Security -> Custom Level.
• All VBScript interfaces unique to the Web Thin Client continue to have access to IWS
tags and IWS built-in functions.
• When using a Windows CE device for the Web Thin Client, be sure ActiveX support and
VBScript support is enabled. This is a function of the Windows CE OS image built
using Microsoft Platform Builder.
• When using a Windows CE device for the Web Thin Client, verify that MsgBox and
InputBox functions are enabled in the Windows CE OS image if you intent to use them,
62 InduSoft, Ltd.