Dropdown

Dropdown control: selects one value from an items list, exposing the selection as a string value.

The Dropdown renders a select control fed by an items list (label/value pairs, statically configured or bound from an array). The selected entry's value comes out on value (string level); onChange fires per user selection. Styling, enabled, and interaction states follow the standard controls surface.

When to use it

One-of-many choices too numerous or space-constrained for radio buttons: country pickers, sort orders, categories. For two or three visible-at-once options prefer a Radio Button Group.

At a glance

Category	Visual
Type name	net.noodl.controls.options
Available in	browser
SSR compatibility	safe
Provided by	noodl-viewer-react

Inputs

Values

Name	Type	Default	Description
alignX	Enum (left, center, right)	—	Horizontal alignment of this element within the space its parent gives it
alignY	Enum (top, center, bottom)	—	Vertical alignment of this element within the space its parent gives it
backgroundColor	Color	transparent	Fill colour of the closed dropdown; the open list is drawn by the browser and cannot be styled here
blockTouch	Boolean	—	Stops every pointer event that lands on this control from reaching the nodes it sits inside. Blunt: it takes hover and pointer-down with it, so reach for Click Bubbling first if it is only clicks you want to keep in
borderBottomColor	Color	—	Colour of the bottom edge only, overriding Border Color
borderBottomLeftRadius	Number	—	Rounds the bottom-left corner only, overriding Corner Radius
borderBottomRightRadius	Number	—	Rounds the bottom-right corner only, overriding Corner Radius
borderBottomStyle	Enum (none, solid, dotted, dashed)	—	Line style for the bottom edge only, overriding Border Style; None hides that edge
borderBottomWidth	Number	—	Thickness of the bottom edge in pixels, and it adds to the element's size
borderColor	Color	#000000	Colour of the border, which has no effect while Border Style is None
borderLeftColor	Color	—	Colour of the left edge only, overriding Border Color
borderLeftStyle	Enum (none, solid, dotted, dashed)	—	Line style for the left edge only, overriding Border Style; None hides that edge
borderLeftWidth	Number	—	Thickness of the left edge in pixels, and it adds to the element's size
borderRadius	Number	5	Rounds all four corners, except any corner that sets its own radius
borderRightColor	Color	—	Colour of the right edge only, overriding Border Color
borderRightStyle	Enum (none, solid, dotted, dashed)	—	Line style for the right edge only, overriding Border Style; None hides that edge
borderRightWidth	Number	—	Thickness of the right edge in pixels, and it adds to the element's size
borderStyle	Enum (none, solid, dotted, dashed)	solid	Line style for all four edges; None hides the border and leaves Border Width and Color inactive
borderTopColor	Color	—	Colour of the top edge only, overriding Border Color
borderTopLeftRadius	Number	—	Rounds the top-left corner only, overriding Corner Radius
borderTopRightRadius	Number	—	Rounds the top-right corner only, overriding Corner Radius
borderTopStyle	Enum (none, solid, dotted, dashed)	—	Line style for the top edge only, overriding Border Style; None hides that edge
borderTopWidth	Number	—	Thickness of the top edge in pixels, and it adds to the element's size
borderWidth	Number	2	Thickness of the border in pixels, which adds to the element's size unless Box Sizing accounts for it
boxShadowBlurRadius	Number	5	How soft the shadow edge is; 0 gives a hard edge
boxShadowColor	Color	#00000033	Colour of the shadow, including how transparent it is
boxShadowEnabled	Boolean	false	Turns the drop shadow on
boxShadowInset	Boolean	false	Draws the shadow inside the element instead of behind it
boxShadowOffsetX	Number	0	How far to the right the shadow is cast from the element
boxShadowOffsetY	Number	0	How far down the shadow is cast from the element
boxShadowSpreadRadius	Number	2	How much larger than the element the shadow is drawn
clickBubbling	Enum (auto, always, never)	auto	Whether a click on this control also fires Click on the nodes it sits inside. Automatic keeps it here as soon as this control's own Click is connected, so a Favourite button inside a clickable card runs Favourite and not the card; Always is the older behaviour where both run; Never keeps every click here, wired or not
color	Color	—	Colour of the text itself, not of the element behind it
cssClassName	String	``	Extra CSS class names to put on this element, for styling from a stylesheet you supply
enabled	Boolean	true	Lets the user interact with this control; when off it still renders and occupies its space but ignores clicks, touches and typing
fontFamily	Font	—	Typeface to render the text in, either a web-safe family name or a font file added to the project
fontSize	Number	—	Height of the text, in pixels
height	Dimension	100	Height of the element; how the value is read depends on Size Mode
iconColor	Color	#000000	Colour of the icon
iconIconSource	Icon	—	Which glyph to show, picked from an installed icon set
iconImageSource	Image	—	Image file to show instead of an icon-set glyph
iconPlacement	Enum (left, right)	left	Which side of the label the icon sits on, with Icon Spacing as the gap between them
iconSize	Number	16	Height of the icon
iconSourceType	Enum (image, icon)	icon	Whether the icon comes from an installed icon set or from an image file, which decides the source port below
iconSpacing	Number	10	Gap between the icon and the text beside it
items	Array	—	Options to offer, as an array of objects with Label and Value properties; an empty value offers nothing
label	String	Label	Text shown on this element
labelSpacing	Number	10	Gap between the label and the edges around it
labelcolor	Color	—	Colour of the text itself, not of the element behind it
labelfontFamily	Font	—	Typeface to render the text in, either a web-safe family name or a font file added to the project
labelfontSize	Number	—	Height of the text, in pixels
labelletterSpacing	Number	Auto	Extra space added between characters; leave as Auto to use the spacing built into the font
labellineHeight	Number	Auto	Vertical space each line of text occupies; leave as Auto to follow the font
labeltextStyle	TextStyle	None	Applies one of the project's saved text styles; the individual font ports below override whatever it sets
labeltextTransform	Enum (none, uppercase, lowercase, capitalize)	none	Forces the text to upper case, lower case or capitalised without changing the underlying value
letterSpacing	Number	Auto	Extra space added between characters; leave as Auto to use the spacing built into the font
lineHeight	Number	Auto	Vertical space each line of text occupies; leave as Auto to follow the font
marginBottom	Number	—	Space outside the element's bottom edge, between it and its neighbours
marginLeft	Number	—	Space outside the element's left edge, between it and its neighbours
marginRight	Number	—	Space outside the element's right edge, between it and its neighbours
marginTop	Number	—	Space outside the element's top edge, between it and its neighbours
maxHeight	Number	—	Largest height the element may grow to, taking priority over Height
maxWidth	Number	—	Largest width the element may grow to, taking priority over Width
minHeight	Number	—	Smallest height the element may shrink to, taking priority over Height
minWidth	Number	—	Smallest width the element may shrink to, taking priority over Width
mixBlendMode	Enum (normal, multiply, screen, overlay, darken, lighten, color-dodge, color-burn, hard-light, soft-light, difference, exclusion, hue, saturation, color, luminosity)	normal	How this element's colours blend with whatever is painted behind it
mounted	Boolean	true	Removes the element from the page entirely when false, unlike Visible which leaves its space behind
opacity	Number	1	How opaque this element is, from 0 for invisible to 1 for solid
paddingBottom	Number	0	Space inside the element's bottom edge, between it and its content
paddingLeft	Number	0	Space inside the element's left edge, between it and its content
paddingRight	Number	0	Space inside the element's right edge, between it and its content
paddingTop	Number	0	Space inside the element's top edge, between it and its content
placeholder	String	—	Text shown while nothing is selected
placeholderOpacity	Number	0.5	How faded the placeholder text is, from 0 to 1
position	Enum (relative, absolute, sticky, fixed)	relative	How the element is placed: In Layout follows its siblings, Absolute ignores them, Sticky pins to the parent edge on overflow, Fixed stays put and takes no space
sizeMode	Enum (explicit, contentWidth, contentHeight, contentSize)	contentSize	Whether Width and Height are used as given, or the element sizes itself to fit its contents
styleCss	String	/* background-color: red; */	Raw CSS declarations applied to this element, overriding the styling ports above
textStyle	TextStyle	None	Applies one of the project's saved text styles; the individual font ports below override whatever it sets
textTransform	Enum (none, uppercase, lowercase, capitalize)	none	Forces the text to upper case, lower case or capitalised without changing the underlying value
transformOriginX	Number	50	Horizontal point the element rotates and scales around, as a fraction of its width
transformOriginY	Number	50	Vertical point the element rotates and scales around, as a fraction of its height
transformRotation	Number	0	Rotates the element clockwise in degrees, without affecting the layout
transformScale	Number	1	Scales the element about its transform origin; 1 leaves it unscaled
transformX	Number	0	Moves the element right after layout, without moving its siblings
transformY	Number	0	Moves the element down after layout, without moving its siblings
useIcon	Boolean	false	Shows an icon on this element
useLabel	Boolean	false	Shows a text label on this element
value	String	—	Selects the option with this Value; a value matching no option deselects everything. Setting it from the graph does not fire Changed
variant	String	—	Name of a saved variant of this node type to apply, replacing the styling set here
visible	Boolean	true	Hides the element while keeping the space it occupies in the layout
width	Dimension	100	Width of the element; how the value is read depends on Size Mode
zIndex	Number	—	Paint order among overlapping siblings; higher numbers paint on top

Outputs

Values

Name	Type	Default	Description
boundingHeight	Number	—	Height this element actually ended up with after layout, in pixels
boundingWidth	Number	—	Width this element actually ended up with after layout, in pixels
childIndex	Number	—	This element's position among its parent's children, counting from 0
enabled	Boolean	—	Reports back whether this control is currently accepting interaction, following the Enabled input
focusState	Boolean	—	True while this control holds keyboard focus, so typing and Enter go to it
hoverState	Boolean	—	True while the pointer is over this control; stays false on touch devices with no pointer
pressedState	Boolean	—	True while a mouse button or finger is held down on this control, and false again the moment it is released or slides off
screenPositionX	Number	—	Distance in pixels from the left edge of the window to this element's left edge
screenPositionY	Number	—	Distance in pixels from the top edge of the window to this element's top edge
this	Reference	—	A reference to this node itself, for ports that take a node rather than a value
value	String	—	Value of the option currently selected

Signals

Name	Type	Default	Description
didMount	Signal	—	Fires once this element has been added to the page and can be measured
hoverEnd	Signal	—	Fires when the pointer leaves this control, including when it leaves while a button is still held
hoverStart	Signal	—	Fires when the pointer moves onto this control
onBlur	Signal	—	Fires when keyboard focus leaves this control, which is the usual place to validate what was entered
onChange	Signal	—	Fires when the user picks a different option; a value arriving on the Value input does not fire it
onFocus	Signal	—	Fires the moment this control takes keyboard focus, whether from a click, a tab or a Focus action
pointerDown	Signal	—	Fires as a mouse button or finger goes down on this control, before any click has completed
pointerUp	Signal	—	Fires when the mouse button or finger is lifted, and also when a touch is cancelled by the system
willUnmount	Signal	—	Fires just before this element is removed from the page, while it still exists

Dynamic ports

This node's port list changes at runtime (declared-port-groups); the tables above may be incomplete for a given instance.

Declares conditional/expandable port groups whose visibility depends on parameter values (see declaredPortGroups).

Condition	Inputs shown	Outputs shown
sizeMode = explicit OR sizeMode = contentHeight	width	—
sizeMode = explicit OR sizeMode = contentWidth	height	—
useIcon = true	iconSourceType, iconSize, iconPlacement, iconSpacing	—
useIcon = true AND iconSourceType = image	iconImageSource	—
useIcon = true AND iconSourceType = icon	iconIconSource, iconColor	—
useLabel = true	label, labeltextStyle, labelfontFamily, labelfontSize, labelcolor, labelletterSpacing, labellineHeight, labeltextTransform, labelSpacing	—
borderStyle = solid OR borderStyle = dashed OR borderStyle = dotted OR borderStyle NOT SET	borderWidth, borderColor	—
borderLeftStyle = solid OR borderLeftStyle = dashed OR borderLeftStyle = dotted OR borderStyle = solid OR borderStyle = dashed OR borderStyle = dotted OR borderStyle NOT SET	borderLeftWidth, borderLeftColor	—
borderTopStyle = solid OR borderTopStyle = dashed OR borderTopStyle = dotted OR borderStyle = solid OR borderStyle = dashed OR borderStyle = dotted OR borderStyle NOT SET	borderTopWidth, borderTopColor	—
borderRightStyle = solid OR borderRightStyle = dashed OR borderRightStyle = dotted OR borderStyle = solid OR borderStyle = dashed OR borderStyle = dotted OR borderStyle NOT SET	borderRightWidth, borderRightColor	—
borderBottomStyle = solid OR borderBottomStyle = dashed OR borderBottomStyle = dotted OR borderStyle = solid OR borderStyle = dashed OR borderStyle = dotted OR borderStyle NOT SET	borderBottomWidth, borderBottomColor	—
boxShadowEnabled = true	boxShadowOffsetX, boxShadowOffsetY, boxShadowInset, boxShadowBlurRadius, boxShadowSpreadRadius, boxShadowColor	—

Ports at runtime

Declared-port-groups: the items source (static list vs bound array with label/value mappings), label ports and per-visual-state styling ports appear based on parameters. Bind items from an array to populate dynamically.

Patterns

• Bind items from a Query Records/Static Array result; wire value into a filter input — a data-driven filter bar in three nodes.

Examples

Settings form: the standard input controls bound to values

One of each core control: Text Input's live string comes out of onTextChanged, Checkbox exposes checked (level) plus onChange (edge), Dropdown (net.noodl.controls.options) takes an items list and emits the selected value, Slider (net.noodl.controls.range) emits a numeric value between min/max, and a Radio Button Group reports the value of whichever child Radio Button is selected. Values flow into a live summary — no submit step needed for value binding.

Related nodes

Radio Button, Radio Button Group, Static Array

Generated

This page is generated from node-catalog-enriched.json. Do not edit it by hand — run npm run docs:nodes to regenerate, and fix the source enrichment instead.