VBScript Reference Manual for InduSoft Web Studio

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VBScript Reference Manual InduSoft Web Studio ReDim Description Declare dynamic array variables, and allocates or reallocates storage space at the procedural level Usage ReDim [Preserve] varname(subscripts) [, varname(subscripts)] Arguments Preserve Optional. Preserves the data in an existing array when you change the size of the single dimension or the last dimension (only). If an array is contracted, data in the last elements will still be lost. There is a high overhead associated with using the Preserve functionality and should only be used when necessary. varname Required, Name of the array variable, following standard variable naming conventions. Can be any Variant subtype. Subscripts Dimensions of an array variable, up to 60 multiple dimensions may be declared. The subscripts argument uses the following syntax: Upper[,upper]… The lower bound of an array is always zero in VBScript since arrays are zero-based. Returns Returns a Variant containing an Array Remarks The ReDim statement is used to size or resize a dynamic array that has already been formally declared using a Private, Public, or Dim statement with empty parentheses (without dimension subscripts). You can use the ReDim statement repeatedly to change the number of elements and dimensions in an array. If you use the Preserve keyword, you can resize only the last array dimension, and you can't change the number of dimensions at all. For example, if your array has only one dimension, you can resize that dimension because it is the last and only dimension. However, if your array has two or more dimensions, you can change the size of only the last dimension and still preserve the contents of the array. Note that if you make an array smaller than it was originally, data in the eliminated elements is lost. A dynamic array must be declared without dimension subscripts. See also Dim, Set Example(s) Dim X() ‘ Declare a dynamic array ReDim X(10,10,10) ‘ Declares dynamic array variables ReDim Preserve X(10,10,15) ‘ Change the size of the last dimension, preserving data Rem (or) ‘ Description Includes explanatory remarks in a program Usage Rem comment or ‘ comment Arguments comment The comment argument is the text of any comment you want to include. After the Rem keyword, a space is required before comment. Returns N/A Remarks You can use an apostrophe (') instead of the Rem keyword. If the Rem keyword follows other statements on a line, it must be separated from the statements by a colon. However, when you use an apostrophe, the colon is not required after other statements. Example myStr1 = “control” : Rem This is a comment after a statement, separated by a colon myStr2 = “valve” ‘ This is also a comment but here, no colon is needed Rem This is a comment line. No colon is needed 190 InduSoft, Ltd.
InduSoft Web Studio VBScript Reference Manual Select Case Description Executes one of several groups of statements, depending on the value of an expression Usage Select Case testexpression [Case expressionlist-n [statements-n]] . . . [Case Else [elsestatements-n]] End Select Arguments testexpression Any numeric or string expression. expressionlist-n Required if Case appears. A comma delimited list of one or more expressions. statements-n One or more statements executed if testexpression matches any part of expressionlist-. elsestatements-n One or more statements executed if testexpression doesn't match any of the Case clauses. Remarks If testexpression matches any Case expressionlist expression, the statements following that Case clause are executed up to the next Case clause, or for the last clause, up to End Select. Control then passes to the statement following End Select. If testexpression matches an expressionlist expression in more than one Case clause, only the statements following the first match are executed. The Case Else clause is used to indicate the elsestatements to be executed if no match is found between the testexpression and an expressionlist in any of the other Case selections. Although not required, it is a good idea to have a Case Else statement in your Select Case block to handle unforeseen testexpression values. If no Case expressionlist matches testexpression and there is no Case Else statement, execution continues at the statement following End Select. Select Case statements can be nested. Each nested Select Case statement must have a matching End Select statement. Example Dim Color, MyVar Sub ChangeBackground (Color) MyVar = lcase (Color) Select Case MyVar Case "red" document.bgColor = "red" Case "green" document.bgColor = "green" Case "blue" document.bgColor = "blue" Case Else MsgBox "pick another color" End Select End Sub InduSoft, Ltd. 191
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VBScript Reference Manual for InduSoft Web Studio

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