# Help needed with drop down menus
**URL:** https://community.thunkable.com/t/help-needed-with-drop-down-menus/1604888
**Category:** Questions about Thunkable X
**Created:** [November 9, 2021, 3:08am UTC](https://community.thunkable.com/t/help-needed-with-drop-down-menus/1604888 "2021-11-09T03:08:10Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@jakeheron](https://community.thunkable.com/u/jakeheron)
#### Post date: [November 9, 2021, 3:08am UTC](https://community.thunkable.com/t/help-needed-with-drop-down-menus/1604888/1 "2021-11-09T03:08:10Z")
Hi,
I have an app that allows students to enter their lessons into a schedule. The lessons are displayed in a list and the user selects one to add that lessons to the schedule. Here is what the screen looks like:
When a user selects a subject, it is added to the first available text input. I want to implement a ‘back’ button which removes the text of the last filled text input. I have developed a procedure but I can not get it to work:
Here is a link to the project:
[https://x.thunkable.com/copy/c4263d1e32606aba5e51e2d01eae7712](https://x.thunkable.com/copy/c4263d1e32606aba5e51e2d01eae7712)
Any help would be much appreciated.
Thanks!
---
### Author:  [@tatiang](https://community.thunkable.com/u/tatiang)
#### Post date: [November 9, 2021, 3:30am UTC](https://community.thunkable.com/t/help-needed-with-drop-down-menus/1604888/2 "2021-11-09T03:30:12Z")
Why don’t you store the text input count when filling those components? If you create a variable called something like lastInputNumber and start it at 0, you can increase it by one each time a list viewer item is clicked.
Then, when the user clicks the back button, you just do `in list all text input in Set Up Timetable set # app variable lastInputNumber to ""`. And decrease lastInputNumber by 1.
Then there’s no need for a loop.
---
### Author:  [@jakeheron](https://community.thunkable.com/u/jakeheron)
#### Post date: [November 18, 2021, 8:17am UTC](https://community.thunkable.com/t/help-needed-with-drop-down-menus/1604888/3 "2021-11-18T08:17:13Z")
Hi @tatiang thanks for your advise. I have tried implementing this however, it is not working. Here is what I have made:
---
### Author:  [@tatiang](https://community.thunkable.com/u/tatiang)
#### Post date: [November 18, 2021, 8:23am UTC](https://community.thunkable.com/t/help-needed-with-drop-down-menus/1604888/4 "2021-11-18T08:23:39Z")
Is there a reason you’re subtracting 1 from `app variable last input number`? If that value starts at 0 and gets increased by 1 when an item is clicked, then it would be 1 after the first item is clicked and if you subtract 1, you get 0 meaning that you’d be setting list item #0 which isn’t possible.
I know that might be confusing… just wondering why you have that subtraction in the `when back Click` section.
---
### Author:  [@tatiang](https://community.thunkable.com/u/tatiang)
#### Post date: [November 18, 2021, 8:32am UTC](https://community.thunkable.com/t/help-needed-with-drop-down-menus/1604888/5 "2021-11-18T08:32:25Z")
Oh wait, I just noticed that you’re setting the list item to “” but I think you need this Any Component “set” block instead:
---
### Author:  [@jakeheron](https://community.thunkable.com/u/jakeheron)
#### Post date: [November 18, 2021, 9:34am UTC](https://community.thunkable.com/t/help-needed-with-drop-down-menus/1604888/6 "2021-11-18T09:34:51Z")
Thank you very much @tatiang , it works now. 🙂
---
### Author:  [@ioannis](https://community.thunkable.com/u/ioannis)
#### Post date: [November 8, 2024, 1:14pm UTC](https://community.thunkable.com/t/help-needed-with-drop-down-menus/1604888/7 "2024-11-08T13:14:29Z")