VBScript Reference Manual for InduSoft Web Studio

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VBScript Reference Manual InduSoft Web Studio • Variables declared in a Background Task Script Group have a local scope for its specific Script Group only. Variables cannot be shared with other Script Groups, nor any other VBScript Interface. • Background Task Script Groups cannot declare their own Procedures (Subroutines and Functions). • The Execution Field of the Script Group will only support IWS tags or built-in functions. No support for VBScript variables or Procedures is provided in the Execution Field. However, the Background Task Script Groups can do the following: • Access Procedures and Variables within the Background Task Startup Script. • Access Procedures declared in Global Procedures. To create a new Script Group, right-click on the Script subfolder in the Tasks tab of the Workspace. Select the Insert option from the pop-up menu. Note that the Startup Script is already defined. To open (edit) an existing Script Group, simply click its icon in the Script subfolder of the Tasks workspace tab. The code configured in each Script Group is executed by the Background Task. IWS scans the Script Groups sequentially (based on the number of the group) and executes only the Groups in which the condition configured in the Execution Field of the Script Group is set to or is evaluated to be TRUE (a value different from 0). When any Script Group is saved during runtime (e.g. from an on-line configuration download), the Startup Script interface will be executed again, and the current value of the local variables contained in any Script Group will be reset, if any exist. 52 InduSoft, Ltd.
InduSoft Web Studio VBScript Reference Manual Since the Background Task Script Groups run on the IWS Server, there is no effect with Web Thin Clients. Key Notes: • The Execution Field of the Script Group only supports syntax as specified by the IWS built-in language. • Before executing the application, be sure to save (or close) the Screen after any VBScript is entered. Otherwise it might not be updated. This is true for all VBScript interfaces. • If any Script Group is saved during runtime (i.e. on-line configuration), the Startup Script Group will be executed again and the current value of local variables will be reset Scope of VBScript Procedures and Variables The following table summarizes the relationship between the IWS VBScript interface location and its Scope of Variables and Procedures. The table also defines where the Scripts are located Item Global Procedures Graphics Scripts Screen Scripts Command Dynamic Scope of Procedures and Variables All Procedures are global, Variables are accessible only within Global Procedures (local) Procedures and Variables accessible within Graphics Script interface only. Can Call Global Procedures. Procedures and Variables accessible within Screen where the Script is written. Screen Script procedures accessible to ActiveX Events for ActiveX objects contained in the Screen. Can Call Global Procedures. Variables and Script accessible only in Object where the Script is configured. Can Call Global Procedures. Execution Functionality Location/Access Procedures are accessible to any Script on the host Server Executes on host Server and/or Web Thin Client where any screen is displayed. Executes on host Server and/or Web Thin Client where the specific screen is displayed Executes on host Server and/or Web Thin Client where the screen with the specific Object is displayed Declaration of Procedures (Functions and Subroutines) that are available globally Condition-based execution - Graphics Start - Graphics Open - Graphics Close Graphics Scripts execute before Screen Scripts Condition-based execution - Screen Start - Screen Open - Screen Close Execution of Script when Object condition is met Database Workspace Folder Graphics Workspace Folder Within the Screen. Within Object (Command) Properties. The Screen that uses the Object must be open. InduSoft, Ltd. 53
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