Class: DynamicList

LuCI.ui. DynamicList

The DynamicList class implements a widget which allows the user to specify an arbitrary amount of input values, either from free formed text input or from a set of predefined choices.

UI widget instances are usually not supposed to be created by view code directly, instead they're implicitly created by LuCI.form when instantiating CBI forms.

This class is automatically instantiated as part of LuCI.ui. To use it in views, use 'require ui' and refer to ui.DynamicList. To import it in external JavaScript, use L.require("ui").then(...) and access the DynamicList property of the class instance value.

new LuCI.ui.DynamicList(value, choices, options)

ui.js, line 2158

Instantiate a dynamic list widget.

Name Type Default Description
value string | Array.<string> null optional

The initial input value(s).
choices Object.<string, *> optional

Object containing the selectable choices of the widget. The object keys serve as values for the different choices while the values are used as choice labels. If omitted, no default choices are presented to the user, instead a plain text input field is rendered allowing the user to add arbitrary values to the dynamic list.
options LuCI.ui.DynamicList.InitOptions optional

Object describing the widget specific options to initialize the dynamic list.

Extends

Methods

addChoices(values, labels)

ui.js, line 2495

Add new suggested choices to the dynamic list.

This function adds further choices to an existing dynamic list, ignoring choice values which are already present.

Name Type Description
values Array.<string>

The choice values to add to the dynamic lists suggestion dropdown.
labels Object.<string, *>

The choice label values to use when adding suggested choices. If no label is found for a particular choice value, the value itself is used as label text. Choice labels may be any valid value accepted by LuCI.dom#content.

clearChoices()

ui.js, line 2508

Remove all existing choices from the dynamic list.

This function removes all preexisting suggested choices from the widget.

inherited getValidationError(){string}

ui.js, line 166

Returns the current validation error

Returns:
Type Description
string The validation error at this time

inherited getValue(){string|Array.<string>|null}

ui.js, line 2446

Read the current value of the input widget.

Returns:
Type Description
string | Array.<string> | null The current value of the input element. For simple inputs like text fields or selects, the return value type will be a - possibly empty - string. Complex widgets such as DynamicList instances may result in an array of strings or null for unset values.

inherited isChanged(){boolean}

ui.js, line 141

Check whether the input value was altered by the user.

Returns:
Type Description
boolean Returns true if the input value has been altered by the user or false if it is unchanged. Note that if the user modifies the initial value and changes it back to the original state, it is still reported as changed.

inherited isValid(){boolean}

ui.js, line 154

Check whether the current input value is valid.

Returns:
Type Description
boolean Returns true if the current input value is valid or false if it does not meet the validation constraints.

inherited registerEvents(targetNode, synevent, events)

ui.js, line 215

Dispatch a custom (synthetic) event in response to received events.

Sets up event handlers on the given target DOM node for the given event names that dispatch a custom event of the given type to the widget root DOM node.

The primary purpose of this function is to set up a series of custom uniform standard events such as widget-update, validation-success, validation-failure etc. which are triggered by various different widget specific native DOM events.

Name Type Description
targetNode Node

Specifies the DOM node on which the native event listeners should be registered.
synevent string

The name of the custom event to dispatch to the widget root DOM node.
events Array.<string>

The native DOM events for which event handlers should be registered.

inherited render(){Node}

ui.js, line 2227

Render the widget, set up event listeners and return resulting markup.

Returns:
Type Description
Node Returns a DOM Node or DocumentFragment containing the rendered widget markup.

inherited setChangeEvents(targetNode, events)

ui.js, line 285

Set up listeners for native DOM events that may change the widget value.

Sets up event handlers on the given target DOM node for the given event names which may cause the input value to change completely, such as change events in a select menu. In contrast to update events, such change events will not trigger input value validation but they may cause field dependencies to get re-evaluated and will mark the input widget as dirty.

Name Type Description
targetNode Node

Specifies the DOM node on which the event listeners should be registered.
events string repeatable

The DOM events for which event handlers should be registered.

inherited setPlaceholder(value)

ui.js, line 113

Set the current placeholder value of the input widget.

Name Type Description
value string | Array.<string> | null

The placeholder to set for the input element. Only applicable to text inputs, not to radio buttons, selects or similar.

inherited setUpdateEvents(targetNode, events)

ui.js, line 240

Set up listeners for native DOM events that may update the widget value.

Sets up event handlers on the given target DOM node for the given event names which may cause the input value to update, such as keyup or onclick events. In contrast to change events, such update events will trigger input value validation.

Name Type Description
targetNode Node

Specifies the DOM node on which the event listeners should be registered.
events string repeatable

The DOM events for which event handlers should be registered.

inherited setValue(value)

ui.js, line 2463

Set the current value of the input widget.

Name Type Description
value string | Array.<string> | null

The value to set the input element to. For simple inputs like text fields or selects, the value should be a - possibly empty - string. Complex widgets such as DynamicList instances may accept string array or null values.

inherited triggerValidation()

ui.js, line 180

Force validation of the current input value.

Usually input validation is automatically triggered by various DOM events bound to the input widget. In some cases it is required though to manually trigger validation runs, e.g. when programmatically altering values.

Type Definitions

LuCI.ui.DynamicList.InitOptionsLuCI.ui.Dropdown.InitOptions

In case choices are passed to the dynamic list constructor, the widget supports the same properties as Dropdown.InitOptions but enforces specific values for some dropdown properties.

Properties:
Name Type Default Description
multiple boolean false

Since dynamic lists never allow selecting multiple choices when adding another list item, this property is forcibly set to false.
optional boolean true

Since dynamic lists use an embedded dropdown to present a list of predefined choice values, the dropdown must be made optional to allow it to remain unselected.