Dropdown

Pick one option from a list you define or bind to data.

Add it to an app

Open the app builder and find Dropdown in the component palette.
Insert it into the intended region or container.
Set its properties in the inspector. Use a literal for a fixed value or a binding for a value supplied by the app.
Connect its events where the app should respond to a user gesture.
Preview with representative data and save after resolving validation problems.

The type name in the builder’s code view is select.

Settings

Setting	Accepted value	Required	Default	What it controls
Label (`label`)	string	No	"Select"	Supports expression bindings. Shown above the control; also its accessible name. The listed default is inserted when adding a new component.
Options (`options`)	list of value	No	[]	Supports expression bindings. Strings, or { value, label } objects. The listed default is inserted when adding a new component.

Values available to bindings

Value	Type	Initial value	Meaning
`value`	string	""	The chosen option's value.

Refer to these values through components.<component-id>.<value> in a binding. Use the identifier assigned to this instance of Dropdown, not the component type name.

Events

onChange — An option was picked, after value is published.

Connect only the actions the app needs. An event can fetch results, run an enabled data source, set state, update another component, show a notification, or navigate where supported.

Keyboard and accessible labels

Accessible label source: label, else 'Select'.

Arrow keys change the option.

Example: Static options

Setting	Example value
`label`	"Category"
`options`	[{"label":"All categories","value":""},{"label":"Bug","value":"bug"},"question"]

Example: Bound options feeding app state

Setting	Example value
`label`	"Topic"
`options`	"{{ app.topics }}"

When onChange occurs, the example performs:

setStateValue with {"key":"topic","value":"{{ components.Topic.value }}"}

If it is empty or unavailable

Check the source binding, the selected item, and the app’s access. A hosted document, table, review, or storage component needs the corresponding app capability; an offline preview cannot supply live private data. A source running with no results is different from an invalid binding. Inspect the app’s workflow and data source before changing the presentation.