HTML <table> id Attribute

The id attribute on n <table> tag assigns an identifier to the HTML table element. The identifier must be unique across the page.

Example

#

An id attribute on n <table> element.

First name Last name
Denice Hobermann
Paulo Cornell
Jane Hollander
<style>
  table.tb { border-collapse: collapse; width:300px; }
  .tb th, .tb td { padding: 5px; border: solid 1px #777; }
  .tb th { background-color: lightblue;}
</style>

<table class="tb" id="members">
  <tr>
    <th>First name</th>
    <th>Last name</th>
  </tr>
  <tr>
    <td>Denice</td>
    <td>Hobermann</td>
  </tr>
  <tr>
    <td>Paulo</td>
    <td>Cornell</td>
  </tr>
  <tr>
    <td>Jane</td>
    <td>Hollander</td>
  </tr>
</table>

Using id

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

The identifier must be unique across the page.

The id allows programmatic access to the <table> element.

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


Syntax

<table 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 <table> element with a unique id attribute.
Clicking the button displays the number of rows in the table -- both header and data rows.

First name Last name
Denice Hobermann
Paulo Cornell
Jane Hollander

<style>
  table.tb { border-collapse: collapse; width:300px; }
  .tb th, .tb td { padding: 5px; border: solid 1px #777; }
  .tb th { background-color: lightblue;}
</style>

<table class="tb" id="mytable">
  <tr>
    <th>First name</th>
    <th>Last name</th>
  </tr>
  <tr>
    <td>Denice</td>
    <td>Hobermann</td>
  </tr>
  <tr>
    <td>Paulo</td>
    <td>Cornell</td>
  </tr>
  <tr>
    <td>Jane</td>
    <td>Hollander</td>
  </tr>
</table>

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

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

Code explanation

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

Clicking the button calls JavaScript which locates the <table> using the id.

It then counts the number of <tr> (table row) inside the <table> 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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