I have a google apps script html sidebar that works, except the google.script.run.withSuccessHandler function:

let html = "<h1>DriveSocial</h1>
      <input type='search' id='search'>
      <script type='text/javascript'>
      let searchBar = document.getElementById('search');
      searchBar.onsearch = function() {
      google.script.run.withSuccessHandler(showResult).withFailureHandler(fail).searchHashTags(searchBar.value);
      }
      function showResult(html) {
        document.write(html);
      }
      function fail() {
      alert('error');
      }
      </script>";

The document never rewrites itself.

the searchHashTags function is fully debugged, I tried just searchBar instead of searchBar.value, but it still wouldn’t return. Even the failure handler didn’t say anything.