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HTML <tfoot> id Attribute

An id on a <tfoot> tag assigns an identifier to the table footer.

The identifier must be unique across the page.

Example

#

An id attribute on a <tfoot> element.

First Name Last Name
Denice Hobermann
Paulo Cornell
Jane Hollander
Number of finalists: 3
<style>
  table.tb { width: 250px; border-collapse: collapse; }
  .tb th, .tb td { border: solid 1px #777; padding: 5px; }
  .tb th { text-align: center; }
  .tb tfoot { background-color:lightblue; }
</style>

<table class="tb">
  <thead>
    <tr>
      <th>First Name</th>
      <th>Last Name</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Denice</td>
      <td>Hobermann</td>
    </tr>
    <tr>
      <td>Paulo</td>
      <td>Cornell</td>
    </tr>
    <tr>
      <td>Jane</td>
      <td>Hollander</td>
    </tr>
  </tbody>
  <tfoot id="finalist-counter">
    <tr>
      <td colspan="2">Number of finalists: 3</td>
    </tr>
  </tfoot>
</table>

Using id

The id attribute assigns an identifier to the <tfoot> element.

The id allows JavaScript to easily access the <tfoot> element.

It is also used to point to a specific id selector in a style sheet.

Tip:  id is a global attribute that can be applied to any HTML element.


Syntax

<tfoot id="identifier" />

Values

#

Value Description
identifier A unique alphanumeric string. The id value must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens (-), underscores (_), colons (:), and periods (.).

More Examples

A <tfoot> element with a unique id.
Clicking the button displays the number of rows in the table footer.

First Name Last Name
Denice Hobermann
Paulo Cornell
Jane Hollander
Number of finalists: 3

<style>
  table.tbl { width: 250px; border-collapse: collapse; }
  .tbl th, .tbl td { border: solid 1px #777; padding: 5px; }
  .tbl th { text-align: center; }
  .tbl tfoot { background-color:lightblue; }
</style>

<table class="tbl">
  <thead>
    <tr>
      <th>First Name</th>
      <th>Last Name</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Denice</td>
      <td>Hobermann</td>
    </tr>
    <tr>
      <td>Paulo</td>
      <td>Cornell</td>
    </tr>
    <tr>
      <td>Jane</td>
      <td>Hollander</td>
    </tr>
  </tbody>
  <tfoot id="mytfoot">
    <tr>
      <td colspan="2">Number of finalists: 3</td>
    </tr>
  </tfoot>
</table>

<br />
<button onclick="show();">Show # tfoot rows</button>

<script>
  let show = () => {
     let element = document.getElementById("mytfoot");
     let rowCount = element.getElementsByTagName("tr").length;
     alert("# Rows = " + rowCount);
  }
</script>

Code explanation

The id attribute assigns a unique identifier for the <tfoot>.

Clicking the button calls JavaScript which locates the <tfoot> through the id.

It then counts the number of <tr> (table rows) inside the <tfoot> and displays it in an alert box.


Browser support

Here is when id support started for each browser:

Chrome
1.0 Sep 2008
Firefox
1.0 Sep 2002
IE/Edge
1.0 Aug 1995
Opera
1.0 Jan 2006
Safari
1.0 Jan 2003

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Last updated on Sep 30, 2023

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