VBA Excel: How to Prevent Duplicate Entries When Adding Rows to a Table
This might be a silly question, but I'm currently working on an Excel VBA project where I need to add data to a predefined table without allowing duplicate entries based on a unique identifier in a specific column... I've created a form that collects user inputs, and when they submit the form, I loop through the existing rows in the table to check for duplicates before adding the new entry. However, I’m encountering issues with my current approach. Here’s a snippet of the code I’m using: ```vba Sub AddEntryToTable() Dim ws As Worksheet Dim tbl As ListObject Dim newRow As ListRow Dim uniqueID As String Dim existingRow As ListRow Dim isDuplicate As Boolean Set ws = ThisWorkbook.Sheets("Sheet1") Set tbl = ws.ListObjects("DataTable") uniqueID = InputBox("Enter Unique ID:") isDuplicate = False ' Check for duplicates For Each existingRow In tbl.ListRows If existingRow.Range.Cells(1, 1).Value = uniqueID Then isDuplicate = True Exit For End If Next existingRow ' Add new entry if no duplicates If Not isDuplicate Then Set newRow = tbl.ListRows.Add newRow.Range.Cells(1, 1).Value = uniqueID newRow.Range.Cells(1, 2).Value = "Some other data" MsgBox "Entry added successfully!" Else MsgBox "Duplicate entry found! No new entry added." End If End Sub ``` The problem arises when I actually run the code. Sometimes, it allows duplicates or doesn't seem to check properly against the values in the table. I've ensured that the input from the user is trimmed and validated, but I still get unexpected results. I also noticed that the table has been filtered at times, which may impact the row enumeration. I’m using Excel 2016 and would really appreciate any guidance on how to ensure that my duplicate check is robust enough, especially considering the possibility of filtered data. Are there best practices for handling this kind of scenario in VBA, or is there a better approach to ensure uniqueness when adding new rows? This is part of a larger application I'm building. I'd really appreciate any guidance on this. I'm working on a web app that needs to handle this. What am I doing wrong? I'm working in a Windows 11 environment.