An id on a <tbody> tag assigns an identifier to the table body.
The identifier must be unique across the page.
An id attribute on a <tbody> element.
| First name | Last name |
|---|---|
| Denice | Hobermann |
| Paulo | Cornell |
| Number of rows: 2 | |
<style>
table.tb { width:300px; border-collapse: collapse; }
.tb th, .tb td { border: solid 1px #777; padding: 5px; }
.tb thead { background-color:lightblue; }
.tb tbody { font-style: italic; }
</style>
<table class="tb">
<thead>
<tr>
<th>First name</th>
<th>Last name</th>
</tr>
</thead>
<tbody id="users">
<tr>
<td>Denice</td>
<td>Hobermann</td>
</tr>
<tr>
<td>Paulo</td>
<td>Cornell</td>
</tr>
</tbody>
<tfoot>
<tr>
<td colspan="2">Number of rows: 2</td>
</tr>
</tfoot>
</table>
The id attribute assigns an identifier to the <tbody> element.
The id allows JavaScript to easily access the <tbody> 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.
<tbody id="identifier" />
| 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 (.). |
A <tbody> element with a unique id attribute.
Clicking the button displays the number of data rows inside the table body.
| First name | Last name |
|---|---|
| Denice | Hobermann |
| Paulo | Cornell |
| Number of rows: 2 | |
<style>
table.tb { width:300px; border-collapse: collapse; }
.tb th, .tb td { border: solid 1px #777; padding: 5px; }
.tb thead { background-color:lightblue; }
.tb tbody { font-style: italic; }
</style>
<table class="tb">
<thead>
<tr>
<th>First name</th>
<th>Last name</th>
</tr>
</thead>
<tbody id="mytbody">
<tr>
<td>Denice</td>
<td>Hobermann</td>
</tr>
<tr>
<td>Paulo</td>
<td>Cornell</td>
</tr>
</tbody>
<tfoot>
<tr>
<td colspan="2">Number of rows: 2</td>
</tr>
</tfoot>
</table>
<br />
<button onclick="show();">Show # data rows</button>
<script>
let show = () => {
let element = document.getElementById("mytbody");
let length = element.getElementsByTagName("tr").length;
alert("# Rows = " + length);
}
</script>
The id attribute assigns a unique identifier for the <tbody>.
Clicking the button calls JavaScript which locates the <tbody> using the id.
It then counts the number of <tr> (table row) inside the <tbody> and displays it in an alert box.
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 |
Back to <tbody>
