Solved

Read only combobox in MS Access Forms

Posted on 2004-08-05
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Last Modified: 2008-03-17
I have a combobox that is pulling pallet numbers from a pallet lookup table.

Once the user selects the pallet number from the combobox, it flags the pallet number from the pallet lookup table and sets it status as used.

The next user only sees available pallet numbers.

Here's my problem if they accidently select the combobox and delete the value listed they cannot select it again unless I reset the status to available.

I know in VB there is a drop down list that is read only. Access only has a drop down list for dataaccess pages.
What I want is once they have selected the correct pallet # then they cannot delete it from the text box area until they have finished scanning. The they click End Scan button and it resets the combobox with "".


Is there a solution to my problem in Access?
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Question by:redcurl40
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4 Comments
 
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by:morpheus30
Comment Utility
Have you tried basing the recordsource of the combo box on a query instead of a table?

"SELECT ID, Name FROM Pallett ORDER BY Name"
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Author Comment

by:redcurl40
Comment Utility
It is based on a query. How do I keep them from deleting the selected value if they go back into the combo box before I have reset it to "". Remember the value in the combobox drop down are gone once they have selected and confirmed that this is the correct pallet number.

So if they accidentally go back into the combobox for whatever reason and delete it, the number cannot be selected from the drop down.

So after they have selected the correct pallet number I want to locked the combobox until they have finished scanning that pallet. When they are done it then finalizes the scan and resets a text box and the combobox back to "".
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morpheus30 earned 250 total points
Comment Utility
Unfortunately you can't lock a combo box in Access.  But you could change how the combo box gets it's recordsource data.  Create a subroutine when you open the form to do the following:

Dim db As ADODB.Connection
Dim rs As ADODB.Recordset
Dim sSQL As String
Dim sValues As String

Set db = CurrentProject.Connection
Set rs = New ADODB.Recordset

sSQL = "SELECT ID, Name FROM PalletTable ORDER BY Name"

rs.Open sSQL, db, 1, 1

rs.MoveFirst
Do Until rs.EOF
  sValues = sValues & rs(0) & ";" & rs(1) & ";"
  rs.MoveNext
Loop

rs.Close
Set rs = Nothing
db.Close
Set db = Nothing

Me.ComboBoxName.ControlSource = ""
Me.ComboBoxName.ColumnCount = 2
Me.ComboBoxName.BoundColumn = 1
Me.ComboBoxName.RowSource = sValues
Me.ComboBoxName.RowSourceType = "Value List"
Me.ComboBoxName.Requery


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Author Comment

by:redcurl40
Comment Utility
I appreciate the multiple ways you've given me to populate the combobox, but it does not resolve my issue.

I did find a way to resolve my issue, which is to lock down the value of the combobox until they have finished scanning and click on the button End Scan which tests if they scanned all of the pieces.

I created a text box and made set it visible property to false. Placed it over the combobox.

When the user selects the pallet number they want, in the After Update Event of the combobox sets the following.

cboPalletNumber.visible = false
txtPalletNumber.enabled = false
txtPalletNumber.visible = true

Then if they cancel it reset those controls to their opposite states.

I tested it and it works.

I appreciate that you responded as fast as you did. This was a tough one to explain in a few words.

Thank you

Then the rest of my code runs as ususal. And they cannot change the value while scanning a pallet.


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