How to validate power apps edit form before submit

Power Apps edit form validation is a common development challenge. In this video you will see how to validate a Power Apps edit form values against Data source before submitting the form.
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This video contains:
0:00 Introduction
1:33 Data source vs PowerApps validation
3:09 Setup
5:17 Bringing SharePoint validation rules to PowerApps edit form
8:56 What happens when we disable required field in PowerApps data card
10:25 Understanding the difference between NULL and 0-length string
11:32 PowerApps edit form "Updates" property
16:20 submitting two separate PowerApps edit forms with one button click
25:00 conclusion
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[@WaliSayed]

Very useful Agha Ali, thank you for your contributions!

[@cheraideva2]

Good one .. Thank you

[@kismetGH]

super useful, thank you

[@pepper_lab]

Thank you 🎉🎉

[@Malhosainy]

Great in depth validation video, I use forms all the time and I learned few things from you today.
Apart from the learning nature of the video, isnt ir more practical and easier to use the form_name.valid instead?
Thanks!

[@AlirezaAliabadi]

WOW. I didn't even know about it. Is it something that Microsoft newly added?

[@josecarlosbenitezmeyer645]

Hi how can I validate that the new data store be equal or greater than the one before?

[@rebeccamayer3602]

Thanks for the video, struggling with my data validations still.
I have a multi tab form and want to make some fields mandatory. I tried setting ‘required’ field to “true” within properties.. this gives me an asterix next to the Card but does not enforce the field as mandatory?
Any ideas would be greatly appreciated!

[@muzk2710]

Even I am facing the same issue.

[@sistex3729]

Thank you for the great video. Would this work if you have one list with two form screens?

[@AlirezaAliabadi]

I never tried but I don't see a problem

[@sistex3729]

Great, I'm going to try it. I'll let you know if if worked for me. 🙂@@AlirezaAliabadi

[@claracampos89]

Very nice! I followed all the steps. But, when I updated an item in LIST 1, the Update is added as a new row. Do you know how can I fix it?

[@OurWorld-oh4wc]

can i tell you mam

[@vaibhavbavachakar1667]

Too much complicated

[@AlirezaAliabadi]

The joy of app development is in dealing with complexity and overcoming challenges. If that is not your cup of tea, you may consider a different career 🙂