HTML <select> id Attribute

The id attribute on a <select> tag assigns an identifier to the select element. The identifier must be unique across the page.

Example

#

An id attribute on a <select> element.

<select id="select-city">
  <option value="">-- Select city -- </option>
  <option value="paris">Paris</option>
  <option value="london">London</option>
  <option value="athens">Athens</option>
  <option value="madrid">Madrid</option>
</select>

Using id

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

The identifier must be unique across the page.

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

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


Syntax

<select id="identifier" />

Values

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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 <select> element with a unique id attribute.
Clicking the button displays the selected value of the dropdown.



<select id="myselect">
  <option value="">-- Select city -- </option>
  <option value="paris">Paris</option>
  <option value="london">London</option>
  <option value="athens" selected>Athens</option>
  <option value="madrid">Madrid</option>
</select>

<br /> <br />
<button onclick="show();">Show selected value</button>

<script>
  let show = () => {
     let element = document.getElementById("myselect");
     alert("Value = " + element.value);
  }
</script>

Code explanation

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

When the button is clicked, JavaScript which locates the <select> using the id.

Finally, the selected value of the <select> element is displayed 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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