VBScript Reference Manual for InduSoft Web Studio - ICP DAS

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VBScript Reference ManualInduSoft Web StudioString FunctionsFunction DescriptionInStr Returns the position of the first occurrence of one string within another. The search begins at thefirst character of the stringInStrRev Returns the position of the first occurrence of one string within another. The search begins at thelast character of the stringLCase Converts a specified string to lowercaseLeft Returns a specified number of characters from the left side of a stringLen Returns the number of characters in a stringLTrim Removes spaces on the left side of a stringMid Returns a specified number of characters from a stringReplace Replaces a specified part of a string with another string a specified number of timesRight Returns a specified number of characters from the right side of a stringRTrim Removes spaces on the right side of a stringSpace Returns a string that consists of a specified number of spacesStrComp Compares two strings and returns a value that represents the result of the comparisonString Returns a string that contains a repeating character of a specified lengthStrReverse Reverses a stringTrim Removes spaces on both the left and the right side of a stringUCase Converts a specified string to uppercaseVariant Identification FunctionsVariantDescriptionFunctionIsArrayReturns a Boolean value indicating whether a variable is an arrayIsDateReturns a Boolean value indicating whether an expression can be converted to a dateIsEmptyReturns a Boolean value indicating whether a variable has been initialized.IsNullReturns a Boolean value that indicates whether an expression contains no valid data (Null).IsNumeric Returns a Boolean value indicating whether an expression can be evaluated as a numberIsObjectReturns a Boolean value indicating whether an expression refers to a valid Automationobject.TypeName Returns a string that provides Variant subtype information about a variableVarTypeReturns a value indicating the subtype of a variableStatementsVBScript statements are used to perform fundamental operations such as decision making, repetition(looping) and assignments. Statements combined with Operators are the building blocks for morecomplex code.Multiple statements can appear on the same line as long as they are separated by a colon (:). Forpurposes of code readability, it is recommended to use one statement per line.Assignment StatementsMany of VBScripts assignment statements have already been covered. For consistency purposes, theyare listed here. Please refer to the Appendix for a more detailed description of their use.Assignment StatementsStatement DescriptionConstDeclares constants for use in place of literal valuesDimDeclares variables and allocates storage spaceEraseReinitializes the elements of fixed-size arrays, deallocates dynamic-array storage space.Option Explicit Forces explicit declaration of all variables in the scriptPrivateDeclares private variables and allocates storage spacePublicDeclares public variables and allocates storage spaceReDimDeclare dynamic array variables, allocates or reallocates storage space at procedural level18 InduSoft, Ltd.
InduSoft Web StudioVBScript Reference ManualComment StatementsComment statements are used to provide documentation comments with the code.Comment StatementsCommentsDescriptionRemIncludes explanatory remarks in a program‘ Includes explanatory remarks in a program (single quote)Control Flow StatementsBy default, VBScript sequentially moves (flows) through the script from statement to statement. As istypical with virtually all high-level programming languages, control flow statements can alter this flow bybranching to other code sections based upon logic conditions, inputs, errors, etc.One of the most commonly used control flow statement is the If..Then..Else statement. This controlflow statement takes the following format:{simple format} If condition Then statement(s) [Else elsestatement(s) ]{block format}If condition Then[statement(s)][ElseIf condition-n Then[elseifstatement(s)]] . . .[Else[elsestatement(s)]]End IfThe condition can be a boolean constant or boolean variable, or a numeric or string expression thatevaluates to True or False.Refer to the Appendix for a detail description of these functions.Control Flow StatementsFunction DescriptionDo…Loop Repeats a block of statements while a condition is True or until a condition becomes TrueExecute Executes one or more specified statementsExecute Global Executes one or more specified statements in the global namespace of a scriptExit DoExit a Do Loop Function. Transfers control to the statement following the Loop statement.Exit For Exit a For Loop Function (For…Next or For Each…Next loop). Transfers control to thestatement following the Next statement.For...Next Repeats a group of statements a specified number of timesFor Each…Next Repeats a group of statements for each element in an array or collectionIf…Then…Else Conditionally executes a group of statements, depending on the value of an expressionSelect Case Executes one of several groups of statements, depending on the value of an expressionWhile…Wend Executes a series of statements as long as a given condition is TrueWith…End With Executes a series of statements on a single objectInduSoft, Ltd. 19
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