HTML5: How to define a group of related options in a drop-down list?

Last update on February 10 2024 11:41:42 (UTC/GMT +8 hours)

Solution:

HTML Code:

<!DOCTYPE html><!-- Declares the document type and version of HTML -->
<html><!-- Begins the HTML document -->
<head><!-- Contains metadata about the document -->
<meta charset="utf-8"><!-- Specifies the character encoding of the document -->
<title>How to define a group of related options in a drop-down list</title><!-- Sets the title of the document -->
</head><!-- Ends the head section -->
<body><!-- Contains the content of the document -->
<select><!-- Defines a drop-down list -->
<optgroup label="Computer Monitors"><!-- Starts a group of related options for computer monitors -->
<option value="crt">CRT</option><!-- Defines an option for a CRT monitor -->
<option value="lcd">LCD</option><!-- Defines an option for an LCD monitor -->
<option value="led">LED</option><!-- Defines an option for an LED monitor -->
</optgroup><!-- Ends the group of computer monitors -->
<optgroup label="Computer Printers"><!-- Starts a group of related options for computer printers -->
<option value="dot-matrix">Dot-Matrix</option><!-- Defines an option for a dot-matrix printer -->
<option value="ink-jet">Ink-Jet</option><!-- Defines an option for an ink-jet printer -->
<option value="laser">Laser</option><!-- Defines an option for a laser printer -->
</optgroup><!-- Ends the group of computer printers -->
</select><!-- Ends the drop-down list -->
</body><!-- Ends the body section -->
</html><!-- Ends the HTML document -->

Explanation:

The HTML document begins with a declaration of its type and version (<!DOCTYPE html>).
The <html> element encloses the entire HTML document.
The <head> section contains metadata about the document, such as character encoding and title.
The <meta charset="utf-8"> tag specifies the character encoding of the document as UTF-8.
The <title> tag sets the title of the document.
Inside the <body> section, there is a <select> element, which defines a drop-down list.

The <optgroup> elements define groups of related options within the drop-down list.
Each <optgroup> has a label attribute specifying the label for the group.
Inside each <optgroup>, <option> elements define individual options within the group, each with a value attribute representing its value.