Table header to stay fixed at the top when user scrolls it out of view with jQuery

I am trying to design an HTML table where the header will stay at the top of the page when AND ONLY when the user scrolls it out of view. For example, the table may be 500 pixels down from the page, how do I make it so that if the user scrolls the header out of view (browser detects its no longer in the windows view somehow), it will stay put at the top? Anyone can give me a Javascript solution to this?

<table>
  <thead>
    <tr>
      <th>Col1</th>
      <th>Col2</th>
      <th>Col3</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>info</td>
      <td>info</td>
      <td>info</td>
    </tr>
    <tr>
      <td>info</td>
      <td>info</td>
      <td>info</td>
    </tr>
    <tr>
      <td>info</td>
      <td>info</td>
      <td>info</td>
    </tr>
  </tbody>
</table>

So in the above example, I want the <thead> to scroll with the page if it goes out of view.

IMPORTANT: I am NOT looking for a solution where the <tbody> will have a scrollbar (overflow:auto).

Solution

You would do something like this by tapping into the scroll event handler on window, and using another table with a fixed position to show the header at the top of the page.

var tableOffset = $("#table-1").offset().top;
var $header = $("#table-1 > thead").clone();
var $fixedHeader = $("#header-fixed").append($header);

$(window).bind("scroll", function() {
  var offset = $(this).scrollTop();

  if (offset >= tableOffset && $fixedHeader.is(":hidden")) {
    $fixedHeader.show();
  } else if (offset < tableOffset) {
    $fixedHeader.hide();
  }
});

#header-fixed {
  position: fixed;
  top: 0px;
  display: none;
  background-color: white;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table id="table-1">
  <thead>
    <tr>
      <th>Col1</th>
      <th>Col2</th>
      <th>Col3</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>info</td>
      <td>info</td>
      <td>info</td>
    </tr>
    <tr>
      <td>info</td>
      <td>info</td>
      <td>info</td>
    </tr>
    <tr>
      <td>info</td>
      <td>info</td>
      <td>info</td>
    </tr>
  </tbody>
</table>
<table id="header-fixed"></table>

This will show the table head when the user scrolls down far enough to hide the original table head. It will hide again when the user has scrolled the page up far enough again.

Working example: https://jsfiddle.net/andrewwhitaker/fj8wM/