Freezing first row while highlighting row and column

Ben_HVC · November 28, 2020, 3:07am

I need to do a table where I need to freeze the top row and highlight the row and column on hover. I have the 2 working separately but when I combine them, it isn’t working right.

#table_grid {
  border-spacing: 0;
  border-collapse: collapse;
  overflow: hidden;
  font-family: arial, verdana, sans-serif;
  font-size: 12px;
  background: #fff;
  margin: 0px;
  text-align: left;
  max-width: 1200px;
  border-radius: 10px;
}
 
#table_grid td,
th {
  color: #669;
  padding: 9px 8px 4px 8px;
  font-size: 13px;
  position: relative;
}
 
#table_grid tr:hover {
  background-color: rgba(220, 220, 220, 0.5);
}
 
#table_grid td:hover::after,
th:hover::after {
  background-color: rgba(211, 211, 211, 0.2);
  content: '\00a0';
  height: 10000px;
  left: 0;
  position: absolute;
  top: -5000px;
  width: 100%;
  pointer-events: none;
}
 
table {
  text-align: left;
  position: relative;
  border-collapse: collapse;
}
 
th,
td {
  padding: 0.25rem;
}
 
th {
  background: white;
  position: sticky;
  top: 0;
  /* Don't forget this, required for the stickiness */
  box-shadow: 0 2px 2px -1px rgba(0, 0, 0, 0.4);
}

<table id="table_grid">
  <tr class="red">
    <th>test</th>
    <th>test</th>
    <th>test</th>
    <th>test</th>
    <th>test</th>
    <th>test</th>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
</table>

If I change

overflow: hidden

to

overflow: auto

in #table_grid, the highlight on hover and freezing the first row is working but the highlight on hover is running off the screen.

If I change it back to

overflow: hidden

hightlight on hover is working properly but the first row is not freezing.

Is there any way to fix this?

Ray.H · November 28, 2020, 4:33am

Hi hvcmultimedia, welcome to sitepoint!

Your going to want to use overflow:hidden rather than auto to hide the extended height on your psuedo after element. That is what was causing the hover highlight to run off screen as you pointed out.

I see the first row sticking properly with position sticky but I see the other rows layering on top of it. That is a z-index problem due to the position:relative you used on the td for the absolute psuedo after elements.

Try these changes and see if it does what you are wanting.

#table_grid td:hover::after,
th:hover::after {
  background-color: rgba(211, 211, 211, 0.2);
  content: '\00a0';
  height: 10000px;
  left: 0;
  position: absolute;
  z-index: 3; /*added this*/
  top: -5000px;
  width: 100%;
  pointer-events: none;
}

th {
  background: white;
  position: sticky;
  z-index: 2; /*added this*/
  top: 0;
  /* Don't forget this, required for the stickiness */
  box-shadow: 0 2px 2px -1px rgba(0, 0, 0, 0.4);
}

Working page below

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Test Page</title>
<style>
#table_grid {
  border-spacing: 0;
  border-collapse: collapse;
  overflow: hidden;
  font-family: arial, verdana, sans-serif;
  font-size: 12px;
  background: #fff;
  margin: 0px;
  text-align: left;
  max-width: 1200px;
  border-radius: 10px;
}

#table_grid td,
th {
  color: #669;
  padding: 9px 8px 4px 8px;
  font-size: 13px;
  position: relative;
}

#table_grid tr:hover {
  background-color: rgba(220, 220, 220, 0.5);
}

#table_grid td:hover::after,
th:hover::after {
  background-color: rgba(211, 211, 211, 0.2);
  content: '\00a0';
  height: 10000px;
  left: 0;
  position: absolute;
  z-index: 3; /*added this*/
  top: -5000px;
  width: 100%;
  pointer-events: none;
}

table {
  text-align: left;
  position: relative;
  border-collapse: collapse;
}

th,
td {
  padding: 0.25rem;
}

th {
  background: white;
  position: sticky;
  z-index: 2; /*added this*/
  top: 0;
  /* Don't forget this, required for the stickiness */
  box-shadow: 0 2px 2px -1px rgba(0, 0, 0, 0.4);
}

</style>

</head>
<body>

<table id="table_grid">
  <tr class="red">
    <th>test</th>
    <th>test</th>
    <th>test</th>
    <th>test</th>
    <th>test</th>
    <th>test</th>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
</table>

</body>
</html>

Ben_HVC · November 28, 2020, 4:38am

Thansk Ray. Your edit has the column & row highlighting on the hover but the first row is not freezing

Ray.H · November 28, 2020, 4:51am

The first row is <tr class="red"> with the th elements.

It is sticking.

I would use position sticky on the .red class though rather than the th.


th {
  background: white;
  box-shadow: 0 2px 2px -1px rgba(0, 0, 0, 0.4);
}
tr.red {
  position: sticky;
  z-index: 2; /*added this*/
  top: 0;
}

What other first row is there?

Ben_HVC · November 28, 2020, 5:13am

Just that one row. Not sure why it isn’t workign for me. Using Chrome under windows and linux

This is what I am using

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Test Page</title>
<style>
#table_grid {
  border-spacing: 0;
  border-collapse: collapse;
  overflow: hidden;
  font-family: arial, verdana, sans-serif;
  font-size: 12px;
  background: #fff;
  margin: 0px;
  text-align: left;
  max-width: 1200px;
  border-radius: 10px;
}

#table_grid td,
th {
  color: #669;
  padding: 9px 8px 4px 8px;
  font-size: 13px;
  position: relative;
}

#table_grid tr:hover {
  background-color: rgba(220, 220, 220, 0.5);
}

#table_grid td:hover::after,
th:hover::after {
  background-color: rgba(211, 211, 211, 0.2);
  content: '\00a0';
  height: 10000px;
  left: 0;
  position: absolute;
  z-index: 3; /*added this*/
  top: -5000px;
  width: 100%;
  pointer-events: none;
}

table {
  text-align: left;
  position: relative;
  border-collapse: collapse;
}

th,
td {
  padding: 0.25rem;
}


th {
  background: white;
  box-shadow: 0 2px 2px -1px rgba(0, 0, 0, 0.4);
}
tr.red {
  position: sticky;
  z-index: 2; /*added this*/
  top: 0;
}
</style>

</head>
<body>

<table id="table_grid">
  <tr class="red">
    <th>test</th>
    <th>test</th>
    <th>test</th>
    <th>test</th>
    <th>test</th>
    <th>test</th>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
  <tr>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
    <td>test</td>
  </tr>
</table>

</body>
</html>

Ray.H · November 28, 2020, 5:16am

Have you cleared your cache?

Ben_HVC · November 28, 2020, 5:18am

Yes. Cleared it with the since the beginning of time setting

Ray.H · November 28, 2020, 5:24am

Ah, I see, it’s not working in chrome for me either.
Let me see what’s going on here.

PaulOB · November 28, 2020, 9:20am

All tables get a tbody added by the browsers because they are basically invalid without that element and that breaks the sticky effect in chrome. To get the sticky to work you need to use the thead and stick that along with the tr and th. Note that ios still needs the prefix version of sticky as well.

Also the overflow:hidden on the table will also kill the sticky effect and needs to be lost so another way will have to be found to highlight the rows.

Here’s an old working version of mine without the highlight to show it works.

This is your version working but the highlight column effect needs working on but I ran out of time as am just going out

<!doctype html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Test Page</title>
  <style>
    #table_grid {
      border-spacing: 0;
      border-collapse: collapse;
      /*overflow: hidden;*/
      font-family: arial, verdana, sans-serif;
      font-size: 12px;
      background: #fff;
      margin: 0px;
      text-align: left;
      max-width: 1200px;
      width: 100%;
      border-radius: 10px;
      position:relative;
    }

    #table_grid td,
    th {
      color: #669;
      padding: 9px 8px 4px 8px;
      font-size: 13px;
      position: relative;
    }

    #table_grid tr:hover {
      background-color: rgba(220, 220, 220, 0.5);
    }

    #table_grid td:hover::after,
    th:hover::after {
      background-color: rgba(211, 211, 211, 0.2);
      content: '\00a0';
      height: 10000px;
      left: 0;
      position: absolute;
      z-index: 3;
      /*added this*/
      top: -5000px;
      width: 100%;
      pointer-events: none;
    }

    table {
      text-align: left;
      position: relative;
      border-collapse: collapse;
    }

    th,
    td {
      padding: 0.25rem;
    }


    th {
      background: white;
      box-shadow: 0 2px 2px -1px rgba(0, 0, 0, 0.4);
    }

    .thead,
    tr.red,
    tr.red th {
      position: -webkit-sticky;
      position: sticky;
      z-index: 2;
      /*added this*/
      top: 0;
    }

    tr.red th {
      background: red;
    }
  </style>

</head>

<body>

  <table id="table_grid">
    <thead class="thead">
      <tr class="red">
        <th>test</th>
        <th>test</th>
        <th>test</th>
        <th>test</th>
        <th>test</th>
        <th>test</th>
      </tr>
      <thead>

        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
          <td>test</td>
        </tr>
        <tr>
          <td>test</td>
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          <td>test</td>
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          <td>test</td>
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          <td>test</td>
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        </tr>
  </table>
</body>

</html>

PaulOB · November 28, 2020, 1:03pm

As I suspected you can’t have overflow:hidden on a sticky element because a sticky element refers to the overflow mechanism of its nearest ancestor. That means when you want it to stick to the top of the body the parent’s of the sticky element must be free from overflow.

The best you can do and have it stick to the top is to remove the highlight for the columns and maybe just have striped columns by default.

e.g.

The only other alternative would be to construct it as in my previous codepen and have the table scroll within the parent and the sticky table header stays stuck to the top of the table when the table scrolls but not to the top of the viewport.

[Edit]
Actually although the column highlight effect appears to work when added to my original codepen (the one with the sticky header and footer) there is a serious bug in Chrome that allows the columns to overflow the table when hovered near the end of the table. The screen flickers continuously and you can see the oversized columns below the table. I’m guessing the browser is struggling to contain the overflow while at the same time trying to make it sticky and goes into an endless loop of show and hide.

With that in mind the best bet is probably to just highlight the columns with js and avoid the issue altogether. As the column highlighting will do no harm if missing then it can be a graceful enhancement. I would also suggest changing the col element background instead of the td otherwise it starts getting janky calculating all the tds in a big table. (Indeed even the css column highlighting was janky with the large numbers used.)

I’ve put up a proof of concept here using jquery but I’m sure someone in the JS forum could convert it to vanilla js if asked nicely

Note that something to be aware of is that the col element’s background sits beneath the td and th backgrounds so if you give a background to a td or th then it hides the col background.

Hope its of some use anyway

Ben_HVC · November 28, 2020, 3:41pm

Thank you both. This was very helpful

system · February 27, 2021, 10:41pm

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