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Understanding the logic of OnChange

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Posted on by NathanArch

Can someone explain this to me? I'm trying to understand the logic of Onchange when it is supposed to fire or not.

This is supposed to give the same result.. right?

let's say I have 2 controls a label1 and a slider1.

If I go to the OnChange property of Slider1 and put "label1.text=text(slider1.value)" .. it should give the 'same' result as if I would have gone in the text property of Label1 and added "text(slider1.Value)" right?

meaning if I change the slider, the onchange should trigger and change the text of the label? (I know it's better to add this immediatly in the text property of that label) But I'm trying to understand the logic here as the OnChange property doesn't seem to do anything.. I thought i was on a good way of understanding Power apps.. but now i'm feeling a bit lost as to why the onchange isn't triggering or doing anything in this case.

Thanks for your help!

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Building Power Apps

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v-mengmli-msft Microsoft Employee on at

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Hi @NathanArch ,

For OnChange of controls, it means formula will run when value of control is changed.
For example, we can use Set, Patch, Clear on OnChange property to update variables or collection.
The formula you are using just returns true/false, it doesn't do anything like Set or Patch function.

Best regards,
Rimmon

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NathanArch 8 on at

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I see, this clears a lot up for me.. was indeed a stupid question, thanks for your clear and swift reply.. much appreciated

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NathanArch 8 on at

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@v-mengmli-msft One more question,

I tried to do as you explained; I created a variable by adding on Onstart : Set(LabelText,label1.text)

Then on the slider1 OnChange property I added : Set(Labeltext,text(Slider1.value))

when i change the slider.. nothing seems to be happening, could you guide me as to why it would not be triggering or changing the label text property?

thanks again for all your help

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NathanArch 8 on at

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Nevermind ,i got the solution..

I should just add my variable to the text property of that label..

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