JSON function giving behavior function in non behaviour property

[Chris-D]

Hi, I'm trying to use JSON to convert a Powerapps colour into a hex value. It works if I put the code on a button and set a variable, but for some reason it's giving me an error if I try and put this directly into a text label. 

Is this something particular to the JSON function? 

Works on a button:

Error in text label:

EDIT:
Wrapping in a With() didn't work.

[tareqrosul · Accepted solution]

Hello @Chris-D 

The issue you're experiencing is rooted in how PowerApps differentiates between "behavior functions" and "non-behavior properties."

In PowerApps, certain functions are classified as "behavior functions." These functions are meant to execute specific actions or side effects, rather than just returning a value. The JSON() function is one of these behavioral functions. It's primarily designed for actions like converting records or tables to a JSON format rather than being used for direct display.

The OnSelect property of a button is a behavioral property, designed to react to user actions. So, when you use the JSON() function within a button's OnSelect property, it works as expected.
However, the Text property of a label is a non-behavior property, which simply binds and displays data. When you attempt to use a behavior function like JSON() directly within a non-behavior property, PowerApps gives an error or doesn't display the desired output.

The recommended workaround for this situation is using this function within within a button or another behavioral property to set a variable. Then, bind this variable to the Text property of your label.Which you already did.

I hope this clarifies the distinction between behavior functions and non-behavior properties in PowerApps. Let me know if you have any further questions!

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[Chris-D]

Thanks for the explanation.

I have experienced non behaviour functions before, like UpdateContext() and understand that they change the state of things. I can't imagine what JSON() is changing, thought it just returned text.