JQuery toggle() not working in included php file

This code works fine (it hides or reveals the HTML elements with classes ‘PA’, ‘PF’ etc.):

<input type="button" id="moreLess" value="woops">
<script>
$(document).ready(function () {
  $("#moreLess").val($(".TA").is(':visible') ? "-><-" : "<-->");

  $("#moreLess").on('click', function () {
    $(".PF, .PA, .TF, .TA").toggle();
    $("#moreLess").val($(".TA").is(':visible') ? "-><-" : "<-->");
  });
});
</script>

But the exact same code, when included in a php class file (which basically just prints a lot of HTML) does not work.
The code is properly escaped and the resulting HTML is identical to the code which is written by the original method.
So 2 identical JQuery scripts, but the one that is written inside the php class does not work.
To be exact, the ‘.toggle()’ does not work – the reset of the input value from “woops” to “<–>” is executed.

I’ve searched around, but can’t find any clue as to why this doesn’t work.

What is particularly confusing is the fact that the html generated by the 2 methods appears to be identical in every respect.

To clarify, I allowed both versions to create the HTML and :

  <input type="button" id="moreLess" value="woops">
  
  <script>
    $(document).ready(function () {
      $("#moreLess").val($(".TA").is(':visible') ? "-><-" : "<-->");

      $("#moreLess").on('click', function () {
        $(".PF, .PA, .TF, .TA").toggle();
        $("#moreLess").val($(".TA").is(':visible') ? "-><-" : "<-->");
      });
    });
      </script>
      
                <input type="button" id="moreLess" value="woops">
                
                <script>
                  $(document).ready(function () {
                    $("#moreLess").val($(".TA").is(':visible') ? "-><-" : "<-->");
              
                    $("#moreLess").on('click', function () {
                      $(".PF, .PA, .TF, .TA").toggle();
                      $("#moreLess").val($(".TA").is(':visible') ? "-><-" : "<-->");
                    });
                  });
                </script>