VBScript Reference Manual for InduSoft Web Studio

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VBScript Reference Manual InduSoft Web Studio IsNumeric Description Returns a Boolean value indicating whether an expression can be evaluated as a number. Usage boolVal = IsNumeric(expression) Arguments expression The expression argument can be any valid expression. Return A Boolean value Remarks IsNumeric returns True if the entire expression is recognized as a number; otherwise, it returns False. IsNumeric returns False if expression is a date expression, since it is not considered a numeric expression. See Also IsArray, IsDate, IsEmpty, IsNull, IsObject, VarType Example The following example uses the IsNumeric function to determine whether a variable can be evaluated as a number: Dim MyVar, MyCheck MyVar = 53 ' Assign a value. MyCheck = IsNumeric(MyVar) ' Returns True. MyVar = "459.95" ' Assign a value. MyCheck = IsNumeric(MyVar) ' Returns True. MyVar = "45 Help" ' Assign a value. MyCheck = IsNumeric(MyVar) ' Returns False. IsObject Function Returns a Boolean value indicating whether an expression references a valid Automation object. Usage boolVal = IsObject(expression) Arguments expression The expression argument can be any expression. Remarks IsObject returns True if expression is a variable of Object subtype or a user-defined object; otherwise, it returns False. See Also IsArray, IsDate, IsEmpty, IsNull, IsNumeric, VarType Example The following example uses the IsObject function to determine if an identifier represents an object variable: Dim MyInt, MyCheck, MyObject Set MyObject = Me MyCheck = IsObject(MyObject) ' Returns True. MyCheck = IsObject(MyInt) ' Returns False. Join Description Returns a string created by joining a number of substrings contained in an array Usage strVal = Join(list[, delimiter]) Arguments list Required. One-dimensional array containing substrings to be joined. delimiter Optional. String character used to separate the substrings in the returned string. If omitted, the space character (" ") is used. Return A String Remarks If delimiter is a zero-length string, all items in the list are concatenated with no delimiters. This function is not to be confused with the SQL Join function See Also Split Example The following example uses the Join function to join the substrings of MyArray: Dim MyString Dim MyArray(3) MyArray(0) = "Mr." MyArray(1) = "John " MyArray(2) = "Doe " MyArray(3) = "III" MyString = Join(MyArray) ' MyString contains "Mr. John Doe III". 144 InduSoft, Ltd.
InduSoft Web Studio VBScript Reference Manual LBound Description Returns the smallest possible subscript for the indicated dimension of an array. Usage intVal = LBound(arrayname[, dimension]) Arguments arrayname Name of the array variable; follows standard variable naming conventions. dimension Whole number (integer) indicating which dimension's lower bound is returned. Use 1 for the first dimension, 2 for the second, and so on. If dimension is omitted, 1 is assumed. Return An Integer representing the smallest subscript for an array, which in VBScript is always 0 since VBScript arrays are zero-based. Return value will be a Variant subtype Long.. Remarks The LBound function is used with the UBound function to determine the size of an array. Use the UBound function to find the upper limit of an array dimension. The lower bound for any dimension is always 0 in VBScript. LBound will raise a runtime error if the array has not been initialized. See also Dim, ReDim, UBound Example Dim MyArray(3) MsgBox LBound(MyArray) ‘ Displays 0 LCase Function Converts all alpha characters in a string to lowercase. Usage strVal = LCase(string) Arguments string Any valid string expression.. Remarks If string contains Null, Null is returned. Only uppercase letters are converted to lowercase; all lowercase letters and non-letter characters remain unchanged. Return A String. See Also UCase Example The following example uses the LCase function to convert uppercase letters to lowercase: Dim MyString Dim LCaseString MyString = "VBSCript" LCaseString = LCase(MyString) ' LCaseString contains "vbscript". Left Description Returns a specified number of characters from the left side of a string Usage strVal = Left(string, length) Arguments string String expression from which the leftmost characters are returned. length Numeric expression indicating how many characters to return. Return A String. Remarks If string contains Null, Null is returned. If length = 0, a zero-length string("") is returned. If length is greater than or equal to the number of characters in string, the entire string is returned. To determine the number of characters in string, use the Len function. See Also LeftB, Len, LenB, LTrim, Mid, MidB, Right, RTrim, Trim Example Dim myStr, extStr myStr = “UpAndDown” extStr = Left(myStr, 2) ‘Returns “Up” InduSoft, Ltd. 145
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