a!dropdownField_20r2 Component

This page contains information related to an old version of the Dropdown Component.

To take advantage of the latest features and improvements, we always recommend you use the latest version whenever possible. See the latest version's page for information about what's been changed.

Function: a!dropdownField_20r2()

Displays a limited set of exclusive choices from which the user must select one item and saves a value based on the selected choice. To save the index of the choice instead of a value, use dropdown by index.

If the user may select none, one, or many of the choices, then consider using checkboxes or a multiple dropdown.

If there aren't many choices and users would benefit from easily seeing them all at once, consider using radio buttons.

Parameters

Name	Keyword	Types	Description
Label	`label`	Text	Text to display as the field label.
Label Position	`labelPosition`	Text	Determines where the label appears. Valid values: `"ABOVE"` (default) Displays the label above the component. `"ADJACENT"` Displays the label to the left of the component. `"COLLAPSED"` Hides the label. The label will still be read by screen readers; see accessibility considerations for more information. `"JUSTIFIED"` Aligns the label alongside the component starting at the edge of the page.
Instructions	`instructions`	Text	Supplemental text about this field.
Required	`required`	Boolean	Determines if a value is required to submit the form. Default: false.
Disabled	`disabled`	Boolean	Determines if the field should display as potentially editable but grayed out. Default: false.
Choice Labels	`choiceLabels`	List of Text String	Array of options for the user to select.
Choice Values	`choiceValues`	List of Variant	Array of values associated with the available choices.
Placeholder Label	`placeholderLabel`	Text	Text to display when nothing is selected and the value is null.
Display Value	`value`	Any Type	Value of the choice to display as selected.
Validations	`validations`	List of Text String	Validation errors to display below the field when the value is not null.
Save Input To	`saveInto`	List of Save	One or more variables that are updated with the choice value when the user changes the selection. Use a!save() to save a modified or alternative value to a variable.
Validation Group	`validationGroup`	Text	When present, the requiredness of the field is only evaluated when a button in the same validation group is pressed. The value for this parameter cannot contain spaces. For example, `“validation group”` is not a valid value. You need to add an underscore between words: `“validation_group”`. See the following recipes for more information: Configure Buttons with Conditional Requiredness Validation Groups for Buttons with Multiple Validation Rules'
Required Message	`requiredMessage`	Text	Custom message to display when the field's value is required and not provided.
Help Tooltip	`helpTooltip`	Text	Displays a help icon with the specified text as a tooltip. The tooltip displays a maximum of 500 characters. The help icon does not show when the label position is `"COLLAPSED"`.
Accessibility Text	`accessibilityText`	Text	Additional text to be announced by screen readers. Used only for accessibility; produces no visible change.
Visibility	`showWhen`	Boolean	Determines whether the component is displayed on the interface. When set to false, the component is hidden and is not evaluated. Default: true.

Notes

If you set Label Position to "ADJACENT" or "ABOVE", but do not give a value for Label, a space still displays to the left-side or above, respectively, of the component as if there was a label displayed. To ensure the component appears to the far left when Label has no value, use "COLLAPSED" for Label Position.
Choices display in the same order as defined in the Choice Labels parameter. The Choice Labels argument cannot be null.
Passing a null value to the dropdown's Selected Value parameter causes the placeholder text to appear selected. The Placeholder Label and Selected Value arguments cannot both be null. If the placeholder is selected and Required is true when a validating button is clicked, the field prompts the user to select a value.
Choice Labels and Choice Values must be the same length.
Choice Values cannot contain nulls or duplicate values.

Examples

Copy and paste an example into the INTERFACE DEFINITION in EXPRESSION MODE to see it displayed.

Disabled Dropdown with Label Displayed Above

Use the interactive editor below to test out your code:

Editable Dropdown with the First Choice Selected by Default

Use the interactive editor below to test out your code:

Dropdown with a Blank Choice Selected by Default

Use the interactive editor below to test out your code:

Feature compatibility

The table below lists this component's compatibility with various features in Appian.

Feature	Compatibility	Note
Portals	Compatible
Offline Mobile	Compatible
Sync-Time Custom Record Fields	Incompatible
Real-Time Custom Record Fields	Incompatible	Custom record fields that evaluate in real time must be configured using one or more Custom Field functions.
Process Reports	Incompatible	Cannot be used to configure a process report.
Process Events	Incompatible	Cannot be used to configure a process event node, such as a start event or timer event.

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