Not able return message

i have created one backend code with return message while onclick event fire. In page code when i try to call that function on button onclick but it does not show any message in preview time
My backend code is
export function btnclick()
return “Thank you for filling the form”;
in page code how to display the same please help me

Hi Parthasarathi Sarathi,

Sounds like you are on the right track.
Have you exposed your function from a Web Method? this is mandatory if you wish to call it from page code.

Also, you can use the $w api to change the label of your button:

Hope this helps.