Limit the amount of characters in a caption

When viewing record's hyperlink field on record dashboard, it does not show the URL that is set to default. In order to show this on the table, copy and paste the following code in the data event.

const maxCaptionLength = 4;
ON("change", 'photos', ()=>{
    if(photo && photo.caption && photo.caption.length > maxCaptionLength){
      ALERT(`Photo caption ${maxCaptionLength}`)