Скачать или смотреть How to Ensure Your MsgBox Shows Only Once in Excel VBA

Discover how to modify your Excel VBA code to ensure a message box appears only once when a specific condition is met in your worksheet.
---
This video is based on the question https://stackoverflow.com/q/62743615/ asked by the user 'Thomas Vester' ( https://stackoverflow.com/u/13871929/ ) and on the answer https://stackoverflow.com/a/62744101/ provided by the user 'Super Symmetry' ( https://stackoverflow.com/u/13386420/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Msgbox show only once

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Ensure Your MsgBox Shows Only Once in Excel VBA

If you are managing data in Excel using VBA, you may sometimes face issues with message boxes showing up too frequently, even when they are not triggered appropriately. This can be particularly problematic when you want to prompt user action only once per condition being met. In this blog, I'll guide you through modifying your code so that a message box only appears once when certain criteria in your data is met. Let's dive into the solution!

The Challenge

You may find yourself in a situation where the message box is displayed every time a change occurs in a specific range of cells. For example, consider the case of a register where you want the user to be notified once when the sum of a range of cells exceeds a particular limit (in this case, 4). Currently, if any individual cell in the range changes to a value over 4, the message appears repeatedly, even if the sum of the cells drops below that threshold later on.

Current Code Snippet

The existing VBA code you may be working with might look like this:

[[See Video to Reveal this Text or Code Snippet]]

While this works to show a message when a condition is met, it will not prevent the message box from appearing multiple times once the condition is met.

The Solution

We'll revise this approach to keep track of the last state of your specified cells. By tracking when a value in your target range changes, you can ensure that the message box only appears once for each change that exceeds your desired limit.

Revised Code

Here's the modified code for your Worksheet_Calculate event:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code:

Setting Up a Saved State: The variable rngSavedState is defined to hold the previous values of the target range (AD14:AJ14 in this case), which allows you to compare old values against new values.

Disabling Events Temporarily: By setting Application.EnableEvents = False, you prevent the code from being interrupted by other event triggers while it’s running.

Looping Through Cells: The code checks each cell in the range AD13:AJ13 to see whether its current value differs from the saved state. If it does, it updates the saved state with the current value.

Condition Checking: The code only shows the message box when a cell’s value exceeds 4, and only if the message box hasn’t already been shown for that instance.

Re-enabling Events: After executing the code, Application.EnableEvents = True is called to re-enable Excel events.

Conclusion

Using the above approach, you will be able to control when your message box appears based on changes to specific cells in your Excel worksheet. This enhances the usability of your Excel application, ensuring that users are not overwhelmed with repetitive messages while accurately receiving important notifications.

Final Tip

Make sure to adapt the range of rngSaveState to fit your specific application needs, depending on where you prefer to store the previous values.



By following the steps outlined above, you can streamline your messaging functionality in Excel and improve user interaction. Happy coding!