How to Show Dialog or Pop up box in Canvas PowerApps

Implementation Steps:

1. Navigate to https://office.com 

2. Click On SharePoint and Create a Site if not available else copy the existing Site URL 

3. Create a List in SharePoint (in My demo i have created TestDemo as SharePoint List) and added two records over there

4. Navigate to https://make.powerapps.com 

5. Click Apps 

6. Click New Button --> Select Canvas App --> Select Phone Mode --> Enter the Name as "Popup/Dialog Demo" 

7. Once the Page Opened --> Click Data Source --> Search for SharePoint --> Paste the URL which you copied from Point 1 --> Then select the List, once done you can see the list like below in your application

8. Click On Insert and Add Vertical Gallery and Select the Items as TestDemo from DataSource 

9. Add a Trash Icon from the Icon Option by selecting the Gallery

10. Add a Rectangle in the PowerApps

11. Change Rectangle Fill --> RGBA(0, 0, 0, .5)

12. Add Three labels like Below

    a. Are you sure you want to delete the Record?

    b. Yes

    c. No

13. Group Rectangle, and Three Labels

 14. Enable Rule for Group 

 15. On Start of App 

 Set(enableDialog,false)

 16. Visible Property for Group --> enableDialog

 17.Label On Select of NO 

 Set(enableDialog,false)

 18. Label On Select of YES

 Remove(TESTDEMO,currentItem); Set(enableDialog,false)

 19. On Select of Delete Icon in the Gallery

 Set(enableDialog,true); Set(currentItem,ThisItem);

 That's it 

Video for your Reference , Enjoy watching and Subscribe : https://www.youtube.com/channel/UCnGNN3hdlKBOr6PXotskNLA