Can CSS Alone Style a Select Element Based on its Chosen Option?

Applying Styles to Elements Based on Selected Options: A CSS-Only Approach

Traditionally, styling the

element based on the selected option relied on JavaScript solutions. However, with CSS, we can now achieve this effect purely through CSS.

The Challenge: Styling the Option Element

Attempting to style the element directly only affects its appearance within the options list, not the selected element.

select[name="qa_contact"] option[value="3"] {
background: orange;
}

The Solution: Leveraging the onchange Event

To make the element aware of the selected option, we can assign a value to the data-chosen property in the onchange event.

Now, we can target and style the element based on the value assigned to the data-chosen property.

select[data-chosen='opt3'] {
border: 2px solid red;
}

By using this approach, we successfully apply styles to the

element based on the selected option using only CSS.

Future CSS Enhancements: Subject Selectors

While it is not currently possible to style elements based on selected options with CSS 3, updates like subject selectors in CSS 4 could potentially introduce this capability in the future. However, it remains uncertain whether this feature will become a reality.

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JavaScript css while select using Property Event this border background

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