An id on an <option> tag assigns an identifier to the element.
The identifier must be unique across the page.
A unique id attribute on each of the 5 <option> elements.
<select name="country">
<option id="option-none" value="">-- Select Country --</option>
<option id="option-us" value="us">United States</option>
<option id="option-uk" value="uk">United Kingdom</option>
<option id="option-fr" value="fr">France</option>
<option id="option-it" value="it">Italy</option>
</select>
The id attribute assigns an identifier to the <option> element.
The id allows JavaScript to easily access the <option> 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.
<option 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 (.). |
An id attribute on the second <option> tag.
Clicking the button will display the value of that option.
<select name="country">
<option id="none" value="">-- Select Country --</option>
<option id="us" value="us">United States</option>
<option id="uk" value="uk">United Kingdom</option>
<option id="fr" value="fr">France</option>
<option id="it" value="it">Italy</option>
</select>
<br/>
<button onclick="show();">Show UK value</button>
<script>
let show = () => {
let element = document.getElementById("uk");
alert("Value = " + element.value);
}
</script>
The id attribute assigns a unique identifier for the <option> element.
Clicking the button calls JavaScript which locates the <option> using the id.
Finally, the value of the <option> 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 <option>
