• When a user needs the ability to choose one value from a set of five to 10 options.
• When only the selected value from a set of options needs to be visible once the selection is made.

• When you have more than 10 options and users would benefit from filtering to narrow down the available options. Instead, use ComboBox.
• When you have fewer than five options and need to one option to be selected. Instead, use RadioButtonGroup.
• When you have fewer than five options and multiple selections are required, or possible. Instead, use CheckboxGroup.
• If you have a Boolean selection, for instance “on” or “off”. Instead, use Switch.
• When you have large number (>100) of list items, to prevent performance issues without virtualization, we strongly recommend adding a filter e.g. use a ComboBox instead.

Note: The list will adjust to the height of its container. If you need to modify the height, you can apply a global override to the saltOptionList class to add a maximum height. Keep in mind that this will impact all other lists contained in ComboBox and Dropdown.

Just like native input elements in React, dropdowns can be controlled or uncontrolled. By default a dropdown is uncontrolled. Use the defaultSelected prop to control the default value of the dropdown.

If you want to control the value of the dropdown, use the value and selected props. The onSelectionChange prop is required when using the controlled approach.

To import Dropdown from the core Salt package, use:

• Dropdown usability (https://baymard.com/blog/drop-down-usability)
• Listboxes vs. Dropdown Lists, (https://www.nngroup.com/articles/listbox-dropdown/) NN Group, April 12, 2020