Blazor Dropdown List Example - Custom Templates
This example demonstrates template support in the DropDownList component, illustrating how to customize the dropdown’s visual structure and the rendering of selected values. Templates allow you to replace default fragments with custom markup to meet design and accessibility requirements while preserving keyboard and screen‑reader behavior. Common uses include displaying images or supplementary metadata alongside labels, aligning selected-value formatting with list items, and presenting grouped or categorized items while keeping interaction consistent.
Available template options:
- ItemTemplate — Use ItemTemplate to customize list item content; include icons, formatted text, or additional semantic markup to improve clarity and align items with design requirements. Prefer semantic elements and ARIA labels when including non-textual content.
- HeaderTemplate — Use HeaderTemplate to supply a tailored header for the popup list, useful for grouping, labeling, or adding non-interactive descriptive content. Avoid placing focusable controls inside the header unless required.
- ValueTemplate — Use ValueTemplate to control how the selected item is rendered in the input area, ensuring the displayed value matches the item presentation. Ensure the value template remains readable and concise.
When combining templates, maintain consistent semantic markup and ARIA attributes to preserve accessibility and predictable keyboard navigation. Keep template markup minimal and avoid introducing interactive elements that conflict with the DropDownList’s built-in behaviors. Always test custom templates with keyboard navigation and screen readers, and validate the rendered HTML for semantic correctness.
For implementation details and examples, see the linked documentation below; the resources illustrate patterns for custom item layouts, header composition, and selected-value rendering while preserving the component’s interaction model.
See also