How to disable "Text input" if value retrieved from data source is null/empty/blank.

[dlprentice]

We have ticket numbers that get assigned to request for change submissions. We don't want the text input field or the submit button to be editable/clickable  if the value that shows up exists from our SharePoint list. If nothing shows up we want the field to be editable, and the submit button to be clickable.

The name of our data source that contains the 'FootPrints Ticket Number' :

'Requests for Change'

The name of the input field:

InputField1

The name of the submit button:

FootprintsCreate

[RandyHayes · Accepted solution]

@dlprentice 

You cannot set a value on a control like that in PowerApps.  PowerApps is a no code platform that derives its values on controls with formulas, just like Excel uses formulas to derive information in a cell.

For your TextInput1 control, set the DisplayMode property to:

   If(IsBlank(Parent.Default), Edit, Disabled)

I hope this is helpful for you.

[dlprentice]

Thank you for also taking the time to explain the way values are derived. We were way over thinking how to accomplish this.

[RandyHayes]

@dlprentice 

Happy to help.  Yep, don't overcomplicate.  Keep it simple.  Drop the developer hat at the door and put on the Excel formula hat....PowerApps will be your best friend then. 😁