First, your button will update a Variable - so, in this case, your OnSelect Action will be: Next, your DataCard will need to consume the variable. Well if you want to clear your ContextVariable in between submissions you could add the following. Your controls all "consume" values from other places. I do not understand why the variable is set to "New" on the new record. To set a local variable you can use UpdateContext( { ContextVariable1: Value1 } ) or like these 2 examples: UpdateContext( { CountNumber: 1 } ) or UpdateContext( { Name: "John"} ), To set a global variable you can use Set( VariableName, Value ) or like these 2 examples: Set(  CountNumber, 1  ) or Set( Name, "John" ). To use show either of the above variable types is as easy as putting the variable name in the text property of the object you want to use. The field on the data card is named Progress  and the command on the button is UpdateContext({Progress:"100"}). You would need to set the value of the field you want to change to a variable and then set that variable with the OnSelect event. If you don't close your app or change its value, it would remain its previous value continuously.

In this case, I had a Title field displayed as read-only.

How to Update a Field through a button's OnSelect Event, 'Store Task Template',ID=SharePointIntegration.SelectedListItemID, Re: How to Update a Field through a button's OnSelect Event, Description Field - Plain Text, Multi-line, Status Field - Choice, Required, "Not Started" (Default), "Started", "Complete", Button - "Mark Completed" Action: Changes Status Field to "Complete". In the form below, I want a quick way to mark a task as done, by clicking on a "button". In this PowerApps tutorial, We will discuss PowerApps set field value based on another field.. Also, we will see how to set multiple field values in a single field in PowerApps. It’s late in my time zone. I was getting a nasty error on submit with the last solution:  "An entry is required or has an invalid value. If you are able to get a working version it would be very appreciated.

What other code would I need to prevent this? you use the ; but that gives me an error , is this something with Windows 10 settings ( I'm in the Netherlands ). I figured this formula should work, but nope. You can allso use ContextVariables as "toggle-able" booleans by setting the onSelect property of say a button to: Whenever you click said button it will swap to the opposite value. Connect and engage across your organization. I confirmed that the form is in edit mode.