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 <script src="../tools/jquery/jquery-3.4.1.min.js"></script>
 <button id="test1" value="value1">Test 1</button>
 <button id="test2" value="value2">Test 2</button>
 <button id="test3" value="value3">Test 3</button>
 <button id="something" value="something">something</button>
 <input type="text" id="display" value="">

 <script>
     $(document).ready(function() {
         // this function will only work when one of the first 3 buttons is clicked
         $('button[id^="test"]').click(function(){
             $("#display").val($(this).val());
         });
     })

 </script>