[jquery] Reorder HTML table rows using drag-and-drop

Apparently the question poorly describes the OP's problem, but this question is the top search result for dragging to reorder table rows, so that is what I will answer. I wasn't interested in bringing in jQuery UI for something so simple, so here is a jQuery only solution:

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$(".grab").mousedown(function(e) {
  var tr = $(e.target).closest("TR"),
    si = tr.index(),
    sy = e.pageY,
    b = $(document.body),
    drag;
  if (si == 0) return;
  b.addClass("grabCursor").css("userSelect", "none");
  tr.addClass("grabbed");

  function move(e) {
    if (!drag && Math.abs(e.pageY - sy) < 10) return;
    drag = true;
    tr.siblings().each(function() {
      var s = $(this),
        i = s.index(),
        y = s.offset().top;
      if (i > 0 && e.pageY >= y && e.pageY < y + s.outerHeight()) {
        if (i < tr.index())
          tr.insertAfter(s);
        else
          tr.insertBefore(s);
        return false;
      }
    });
  }

  function up(e) {
    if (drag && si != tr.index()) {
      drag = false;
      alert("moved!");
    }
    $(document).unbind("mousemove", move).unbind("mouseup", up);
    b.removeClass("grabCursor").css("userSelect", "none");
    tr.removeClass("grabbed");
  }
  $(document).mousemove(move).mouseup(up);
});
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.grab {
  cursor: grab;
}

.grabbed {
  box-shadow: 0 0 13px #000;
}

.grabCursor,
.grabCursor * {
  cursor: grabbing !important;
}
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<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table>
  <tr>
    <th></th>
    <th>Table Header</th>
  </tr>
  <tr>
    <td class="grab">&#9776;</td>
    <td>Table Cell 1</td>
  </tr>
  <tr>
    <td class="grab">&#9776;</td>
    <td>Table Cell 2</td>
  </tr>
  <tr>
    <td class="grab">&#9776;</td>
    <td>Table Cell 3</td>
  </tr>
</table>
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Note si == 0 and i > 0 ignores the first row, which for me contains TH tags. Replace the alert with your "drag finished" logic.