JS hide function error

Make sure you load the js at the beginning of the dom, else the function wont be declared.

function showonlyone(thechosenone) { 
   $('.newboxes').each(function () { 
      if ($(this).attr("id") == thechosenone) { 
         $(this).show(); 
      } else { 
         $(this).hide(); 
      }
   }); 
}

Also you can enhance the whole function to this:

function showonlyone(thechosenone) { 
   $('.newboxes:not([data-id='+thechosenone+'])').hide();
  $('.newboxes[data-id='+thechosenone+']').show();
}

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