Vba Excel Level 2

VBA Excel Level II

By Ben Miu

What do we know?
• Macro Recorder
• Basic Variables
• If Then Else
• Loops
• Debugging and error trapping
• Arrays
Now, how do you take your coding to a new
level?

Review Lab
• Type the following code into Excel VBA

Dim AIMCOEmployeeNames(2) as String
AIMCOEmployeeNames(1) = “Jerry”
AIMCOEmployeeNames(2) = “Yang”

For I = 1 to 5
If Range(“A” & i).value = AIMCOEmployeeNames(1) Then Msgbox
(“Found Jerry”)

If Range(“A” & i).value = AIMCOEmployeeNames(2) Then
Msgbox(“Found Yang”)

Next i

String Operations
• InStr function – Tells you if a particular string is
contained in a string. The value you will return is
the location of the string in question, 0 returned
if string not found
• Mid function – Tells you if a particular string in
any particular order

If InStr(Range(“A5”).Value, “Jerry”) > 0 Then

If Mid(Range(“A5”).Value,1,1) = “J” Then

Dilemma
• Say you have the following table

Ben Miu - $100
Ryan Miu - $200
Jessica Wang - $300
Guan Miu - $500

You want to add $100 to each person who has the
last name “Miu”. What code could you write?

Solution
• You could put the results in column C

Ben Miu - $100 $200
Quick tip, if you are
Ryan Miu - $200 $300 using a single If
Jessica Wang - $300 statement with no Else,
you can use the
Guan Miu - $500 $600 following notation
below
For I = 1 to 4
If InStr(Range(“A” & i).Value, “Miu) > 0 Then _
Range(“C” & i).Value = Range(“B” & i).Value + 100
Next
Do you see an issue with the For loop here? It assumes your list has only 4
people but what if you had 1000 names in column A, would you simply count
1000 rows ahead of time and put it into your loop

Range Object
Assets
Accounts Receivable 200
Cash 100
Investments 300
Property 100
Equipment 200

Dim a as Range
Range objects allow you to treat cells as if they
Set a = Range(“A1”)
were individual variables
While a <> “”
a.offset(0,2).value = a.offset(0,1).value + 100 This code executes as long as
Set a = a.offset(1,0) there is no blank in Column A
Wend

Offset / Range / While
• Offset statement has a row and column
section. So if you are in Range(“A1”) and you
offset 1 to the right then it is Offset(0,1)
• The Set statement sets the range to a
particular cell and allows you to move about
Excel treating cells as Range values
• While/Wend loop is equivalent to the Do
While Loop as discussed in Level 1

Lab 1 – Dealing with a real problem
Put this into Excel
Mr. Bubley 24
Mr. Suleyman 25
Mr. Marsden 25
Mrs. Osborne 26
Mrs. Mao 27
Mr. Mao 28
Michael Baker has asked you to determine if a particular name is a MALE name or a
FEMALE name and provide him with the results.

Well, a name with MR in it is a Male name and a name with MRS in it is a FEMALE
name

Lab 1 – Write this code
Dim a as Range

While a <> “”
If InStr(a.value, “Mr.”) > 0 Then
a.offset(0,2).value = “Male”
Else
a.offset(0,2).value = “Female”
End If
What happens if you change the a.offset line
Set a = a.offset(1,0) to a.offset(0,3) instead?
Wend

Subroutines and Functions
• So far, we have only used one subroutine (ie.
the sub where you put your code)
• What if you want to stop copying the same
code over and over again?
• Subroutines perform a procedure whereas
functions provide a piece of information back
to the calling sub.

Example
Dim a as Range

While a <> “”
If a.value = “Jerry” Then
msgbox(“Way”)
Msgbox(“To”)
Msgbox(“Go”)
Msgbox(a.value)
ElseIf a.value = “Grant” Then
msgbox(“Way”)
Getting a bit repetitive don’t you think?
Msgbox(“to”)
Msgbox(“Go”)
Msgbox(a.value)
Else
Msgbox(“Way”)
Msgbox(“to”)
Msgbox(“Go”)
Msgbox(a.value)
End If

Set a = a.offset(1,0)
Wend

How About?
Sub Main()
Dim a as Range
Call statement calls another subroutine
While a <> “”
If a.value = “Jerry” Then We are not using a Function as we are not
Call WayToGo(a.value)
ElseIf a.value = “Grant” Then Expecting a value to be returned
Else

End If
We are ‘passing’ the information in a.value
into the subroutine
Wend
End Sub()
This approach starts to define object oriented
Sub WayToGo(ByVal namevalue as String)
Msgbox(“Way”) programming
Msgbox(“To”)
Msgbox(‘Go”)
Msgbox(namevalue)
End Sub

What is a Function?
• A function is used if you want to receive a
piece of information back to your calling
subroutine
• See next example…

Example of a Function
Sub Main()
Dim AIMCOName as String
AIMCOName = FindLastNameOf(“Jerry”)
End Sub
What will the variable
Function FindLastNameOf(strName) as String AIMCOName hold?
If strName = “Jerry” Then
FindLastNameOf = “Yang”
Else
FindLastNameOf = “N/A”
End If
End function

Lab 2 – Subs/Functions and Ranges
• Type in the following code to see how ranges and separate subs/functions can help

Sub Main()
Dim a as Range

While a <> “”
If a.value = “Jerry” Then
ElseIf a.value = “Grant” Then
Else
End If

Wend
End Sub()

Sub WayToGo(ByVal namevalue as String)
Msgbox(“Way”)
Msgbox(“To”)
Msgbox(‘Go”)
Msgbox(namevalue)
End Sub

ByVal vs ByRef
Variables are passed by Same way to write this code is using this syntax:
default ByVal unless
specified otherwise Sub Test()
Call Ben(a.value)
End Sub
Sub Test()
Sub Ben(ByVal strName as String)
Call Ben(a.value) Msgbox(a.value)
End Sub End Sub

Sub Ben(strName)
Msgbox(a.value)
End Sub

ByVal vs ByRef
This is how to pass a variable ByRef

Sub Test()
Call Ben(a.value)
End Sub

Sub Ben(ByRef strName as String)
Msgbox(a.value)
End Sub

So what is the difference?

ByVal vs ByRef
• When you pass a variable into another sub or
function, ByVal means you are passing the actual
value
• ByRef means you are passing the variable
reference therefore if any changes occur to the
variable in the new sub, it is changed in the
originating variable
• This isn’t really used in day to day VBA
programming as ByVal is usually sufficient so this
won’t be covered in a lab

Dictionaries and Collections
• Arrays have an inherit problem of you having
to know beforehand how many data values
you have What if you didn’t
know
• Ie. AIMCO had 250
employees?

Dim AIMCoEmployees(250) as String
AIMCOEmployees(1) = “Ryan”

• What if you wanted to store more information
and not just employee names?
• What if you wanted to store the employee
name and also their employee number?
Dim AIMCOEmployees(250) as String
Dim AIMCOEmployeeNumber(250) as Integer
AIMCOEmployees(1) = “Ryan”
AIMCOEmployeeNumber(1) = 14000

• Collections and Dictionaries are the
foundation blocks of building a robust
application (Daily Risk covered in level 3)
• Collections/Dictionaries is basically a phone
book with a Key and a Item. See below:

“Jerry Yang”, 555-5555

What is the difference between
dictionary and collection

The same thing essentially. Only difference is
the dictionary object is more user friendly and
robust as you can check if a KEY exists without
using On Error statements. You do however
have to add a library reference for the dictionary
object

Library Reference
• Library references allow you to access the
methods and functions of other Windows
applications
• It allows you to control Powerpoint, Access
and Word all from within Excel. It also allows
you to control Outlook
• For the purposes of this class, we will only
show you how to add a library reference and
not go deeper into this topic

Add a Library Reference
• Add a library reference to MS Scripting RunTime. In
the VBA code window, click on Tools and then go to
References. Find the entry that says Microsoft
Scripting Runtime and then click on the checkbox and
click OK.

Adding a Dictionary Reference
• To add a dictionary reference, you use the
following syntax

Dim dictJerrysBloodPressure as New Dictionary

dictJerrysBloodPressure.Add Key, Item
So
DictjerrysBloodPressure.Add “Morning”, “120/80”

Referencing a dictionary reference
• To reference a dictionary reference you use
the syntax below

dictjerryBloodPressure.Item(Key)

Example:
Bloodpressurevalue =
dictJerryBloodPressure.Item(“Morning”)

Automation Concepts: Xref Tables
• Cross reference tables are the foundation of
automation theory. Dictionary objects work with
Xref tables to create robust VBA programs
• For example, say you are dealing with two
systems, Eagle and FMC. A Eagle security might
be called “MICROSOFT” but in FMC it might be
called “MSFT”, because of these differences, you
setup a Xref table beforehand and then you use
the dictionary to reference it
• Xref tables will be covered more in Level 3 when
the Case studies Daily Risk will be presented

Lab 3
Enter the following code into Excel (remember to make a library reference to
the scripting runtime if you haven’t done so already)

Dim dictEmployeeID as New Dictionary
Dim a as Range: Set a = Range(“A1”) Load Phase, Use Phase

While a <> “”
dictEmployeeID.Add a.value, a.offset(0,1).value
Set a=a.offset(1,0)
Wend

For each key in dictEmployeeID.Keys
Msgbox(dictEmployeeID.Item(Key))
Next key

Userforms
• Open up Excel and go to the VBA code screen
Right click
and
choose
Insert and
then
UserForm

Userforms
When you add a button and you drag it on the Userform, go to the buttons’ properties
and call the button “btnClick” for name and for text type in “Click Me”

Userforms Text that goes into a
label uses the Caption
property. Call this
• Adding a label textbox (name),
lblText

Now let’s make the commandbutton
work
• Double click on the CommandButton and type
in this:

Private Sub btnClick_Click()
Msgbox(“Hello”)
End Sub

Background notes
• When you double click on the button you will notice
the following Sub was added,
• Sub btnClick_Click
The _Click at the end represents the event. Therefore,
the code executes when someone clicks on the button
You shouldn’t put too much code into the click event as
the userform code doesn’t have the full functionality of
codes in a module so you should add a new module and
put a Call statement there ie.

Call Module1.Main()

What if you wanted the userform to
show when the person opened up
Excel?
• On the Project screen, double click on
Thisworkbook. Then click on the First
dropdown menu and choose Workbook and
then make sure the right drop down menu
says Open

Type in the following Code

UserForm1.Show()

Then when the workbook opens, your user form
will show up automatically

Lab 4 – Putting it all together
Create a Userform that looks like below:

Lab 4 – Putting it all Together
• For the commandbutton’s click event, have it say:
Call Module1.Main()

Then create a new module and type in the following:

Sub Main()
Dim dictEmployee as New Dictionary
Dim strName as Variant
dictEmployee.Add “Jerry”, “1-800-JER-YANG”
dictEmployee.Add “Guan”, “1-888-GUA-KHOO”

strName = Inputbox(“Please enter a employee name”)
If dictEmployee.Exists(strName) Then msgbox(“Thanks, here is his phone number “ &
dictEmployee.Item(strName)) Else msgbox(“Person you entered does not exist”)

End Sub

Try adding more entries to the dictEmployee line if
you wish

Summary
• String Operators (InStr and Mid)
• Subs and Functions
• ByVal vs. ByRef
• Dictionaries and Collections
• Ranges
• UserForms
• Event Handlers

Vba Excel Level 2

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