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Dropdown box's default value in a Gallery did not reset after a button is pressed

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Posted on by Del-Dev

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Hi guys! I'm looking into creating a gallery that would execute repeating tables, with reference to Shane Young's YouTube tutorial on PowerApps Repeating Tables like InfoPath Part 1 - Enter the data: PowerApps Repeating Tables like InfoPath Part 1 - Enter the data (youtube.com).

The issue is that I put this expression into my "OnSelect" property of my "Next Page" button to reset the default value of the dropdown: ClearCollect(MeasureCollection,{LineValue: Reset(InputDimension)}); Navigate(HelloForm). Below is the screenshot of my "Next Page" button:

My intention is that when the button "Next Page" is pressed, it would reset the default value of the dropdown to blank and navigate to the "HelloForm". "HelloForm" is the screen that has the dropdown in a gallery that I'm working on right now. My formula in the "Default" property for the dropdown is ThisItem.LineValue , with reference to Shane Young's tutorial mentioned above.

When I run my app and after pressing the "Next Page" button, it should reset the default value of the dropdown to blank. The thing is that it did not and I have encountered this error instead in the following screenshot below:

Did I put the formula wrongly or did I missed anything? Let me know if there is any, thanks!

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Michael E. Gernaey 53,928 Moderator on at

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Hi @Del-Dev

The button is considered out of the Form and Gallery, its simply on the screen.

So lets do this.

1. In the OnVisible of the Screen put this

Set(_ResetDropDown, false);

2. In the Your Button, after you changed the Collection do this

Set(_ResetDropDown, true); Set(_ResetDropDown, false);

Now in the Dropdown's Reset Property put _ResetDropDown

This will force it to reset, from outside the Gallery.

If I have helped you, I would really appreciate if you please Mark my answer as Resolved/Answered, and give it a thumbs up, so it can help others

Cheers

Thank You
Michael Gernaey MCT | MCSE | MCP | Self-Contractor| Ex-Microsoft
https://gernaeysoftware.com
LinkedIn: https://www.linkedin.com/in/michaelgernaey

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Del-Dev 160 on at

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Hi @FLMike,

Thank you for your reply! There are a few questions I would like to clarify with reference to your point 1 and 2:

1. In the OnVisible of the Screen put this
Set(_ResetDropDown, false);

For this, I just put the above expression in the "OnVisible" property of the Screen that has the Gallery in it right?

2. In the Your Button, after you changed the Collection do this
Set(_ResetDropDown, true); Set(_ResetDropDown, false);

For this, I just change the ClearCollect expression back to ClearCollect(MeasureCollection,{LineValue: ""}); Navigate(HelloForm) to remove the Reset function and put back the "" beside the LineValue and put the expressions you have suggested, Set(_ResetDropDown, true); and Set(_ResetDropDown, false); beside my Navigate(HelloForm)?

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Michael E. Gernaey 53,928 Moderator on at

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@Del-Dev

For #1, is the Gallery on a different Screen than the Form? Ok, if the process is, Click on a row in the Gallery, then go to the Form Screen, AND the only way to load another record in the Form is to go back to the Gallery

Then do just the two expression IN the OnVisible of the Form Screen.

If I have helped you, I would really appreciate if you please Mark my answer as Resolved/Answered, and give it a thumbs up, so it can help others

Cheers

Thank You
Michael Gernaey MCT | MCSE | MCP | Self-Contractor| Ex-Microsoft
https://gernaeysoftware.com
LinkedIn: https://www.linkedin.com/in/michaelgernaey

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