An id on a <select> tag assigns an identifier to the dropdown.
The identifier must be unique across the page.
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>
The id attribute assigns an identifier to the <select> element.
The id allows JavaScript to easily access the <select> 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.
<select 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 <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>
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.
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 <select>
