University of Toronto at Scarborough © Andria Hunter, Kersti Wain-Bantin CSCA01 VBA-3 1 Lecture...

University of Toronto at Scarborough© Andria Hunter, Kersti Wain-Bantin CSCA01 VBA-3 1

Lecture Outline

Variable ScopeCalling another subprogramProgramming StyleDialog Boxes (UserForm)Worksheet buttonFunctionsSpreadsheet vs VBA


Variable Scope

Procedure Level (local)Dim iMarbles As Integer

placement: within Sub and End Sub

Module Level (global)Dim giTotal As Integer

placement: before all Sub statements

Project Level (public)Public piGrandTotal As Integer

placement: before all Sub statements


Calling another subprogram

Sub FirstOne()MsgBox “In 1st subprogram…”SecondOne

End Sub

Sub SecondOne()MsgBox “In 2nd subprogram…”

End Sub


Programming Style

Good style improves readability of code and your program is easier to maintain!

1. Comments (documentation) at top (your name, date, etc) each subprogram each variable each major section of code

Don’t restate the obvious!Dim iCount As Integer ‘ declare integer variable


2. Good variable names describe what variables store not too long, or too short

3. Indentation subprograms and if

statements

4. Constants for values that do not change

5. White space leave the occasional blank line

Programming Style


6. Minimize variable scope only make a global or public variable if

needed

7. Declare and Initialize variables Option Explicit forces variable declaration set initial value of variables appropriately

Programming Style


Programming Style - example


UserFormCustom dialog boxExample:

create UserForm to collect personal info form will be launched from Excel data entered in form is stored in Excel


Insert blank formInsertUserForm

blank UserForm

Toolbox withcontrol objects


Design formAdd control objects to form

Label(display text)

TextBox(for input)

CommandButton(perform an action)


Initialize propertiesInitialize properties of controls

Label(Name): lbl…Caption:

TextBox(Name): txt…Text:

CommandButton(Name): cmd…Caption:


Write code

Determine events to which VBA should respond (eg. clicking Add CommandButton)

double-click Add button to open Code window and type the code

Private Sub cmdAdd_Click()

code goes here . . .

End Sub


Flowchart

Start

Name entered?

Stop

Separate name into first and last

Store in worksheet:last, first, phone

Clear textboxes on form

Report error Report error

Phone entered?Phone

entered?

No No

Yes Yes


refers to textbox contents

Code


Code


Create macro

How can we start this form from Excel? There is no macro listed!

write a macro to display form form doesn’t appear until called put this code in Module code, not Form code:

Sub EnterPersonalInfo () macro nameUserForm1.Show form name

End Sub


Add worksheet button Optional: button on worksheet to run macro

>View >Toolbars >Drawing >Oval icon right-click Add Text… right-click Assign Macro…

>View >Toolbars >Control>CommandButton icon right-click Properties right-click View Code>Exit Design Mode icon


Excel FunctionsMost worksheet functions have a VBA equivalent

In VBA:Application.WorkSheetFunction._

FunctionName(arguments)Application.WorksheetFunction.Today()Application.WorksheetFunction.IsNumber (Range(“B3”))In Excel:

=FunctionName(arguments)=Today()=IsNumber(B3)


Find Function

VBA Function – not available on sheet Function is called on an object that defines a

spreadsheet range E.g., Selection.Find(“Tom”)

Returns range location of first match, or returns nothing if no match found.

Range object need not be sorted


Macro asks for name to find and stores in E8 Find function locates name, uses offset to get

its agevName = InputBox(“Name?”, “Enter name”)vAge = Range("A4:A10").Find(vName). Offset(0, 2).Value

Find Function


VLookUp Function

Vlookup (value, table, col_num, close) value: item to find table: range of data to search

must be sorted by 1st column col_num: return data from which column? close: true or false

True: select nearest match – always finds False: find exact, or return #N/A


How it works in Excel

VLookUp Function


How it works in VBA

vName = InputBox(“Name?”, “Enter name”) Range(“E8").Value = vAge

vAge = Application.WorksheetFunction. _VLookup(Range("E8"), Range("A4:C10"), 3, True)

Range("F8").Value = vAge

VLookUp Function

University of Toronto at Scarborough © Andria Hunter, Kersti Wain-Bantin CSCA01 VBA-3 1 Lecture...

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