Prevent user to add multiple break lines in input form

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You can handle with an event-Handler —> onKeyPress(()=>{ }=

This code belongs into the page-----onReady() code-section.

$w('#myTextfield').onKeyPress((event)=>{console.log("Key-Pressed")

         if(pressedKey==="Enter"){console.log("ENTER pressed")
         //DO SOMETHING ---> YOUR ACTIONS HERE
         }
})