uploadbutton

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Now I have made some crucial progress. It seems that the change-event-handler of the uploadbutton is a critical spot (or rather: time) to read out the validity . fileTypeNotAllowed - property. So my code is like this:

export function uploadButton1_change(event)  
     {console.log($w('#uploadButton1').validity.fileTypeNotAllowed)}

and the website visitor chooses a file of the wrong type, the message in the console is false, which is not what I expect, but if you put in a little time delay like this:

export function uploadButton1_change(event) 
      {setTimeout( () =>    
           console.log($w('#uploadButton1').validity.fileTypeNotAllowed),200)  }

and you choose a wrong file type, the answer is true, which is precisely what I want.