[ASKING FOR JS] Javascript wont load after post refresh [SOLVED]

<div>
   <table>
      <thead>
         <th>FILE</th>
      </thead>
      <tbody id="filelist">
         <tr>
            <td>Testinggg</td>
         </tr>
      </tbody>
   </table>
</div>

<script>
window.onload = function(){
   loadFileLibrary();
}

function loadFileLibrary(){
    let filelist = document.getElementById('filelist');
    filelist.innerHTML = '';

    getFile()
    .then(files =>{
       files.forEach(item => {
           filelist.innerHTML += `<tr>
           <td>${item.filename}</td>
           </tr>`;
       });
    }).catch(err => console.error('error :', err));
}
</script>

FILE
____
doc.docsx
test.pdf

FILE
____
Testinggg