Dropdown Menu

Displays a menu to the user, which can consist of links or functions, triggered by a button.

View code

Features

Can be controlled or uncontrolled.
Supports submenus with configurable reading direction.
Customize menu positioning.
Optionally render a pointing arrow.
Fully managed focus.
Full keyboard navigation.
Typeahead support

Anatomy

Trigger: The element which when clicked, opens the dropdown menu.
Menu: The root container for the popover menu
Item: A menuitem which can be a link or a function.
Checkbox Item: A menu item which can be checked or unchecked.
Radio Group: A group of radio items.
Radio Item: A menu item which can be selected from a group of items.
Sub Trigger: A button which toggles the submenu's open state.
Sub Menu: A menu which is nested inside another menu.
Separator: A visual divider between menu items.

Usage

The first thing you need to do is create a dropdown menu using the createDropdownMenu function.

    <script lang="ts">
  import { createDropdownMenu, melt } from '@melt-ui/svelte'
  const {
    elements: { menu, item, trigger, arrow }
  } = createDropdownMenu()
</script>

    <script lang="ts">
  import { createDropdownMenu, melt } from '@melt-ui/svelte'
  const {
    elements: { menu, item, trigger, arrow }
  } = createDropdownMenu()
</script>

Then you can use the menu, item, and trigger to construct a dropdown menu. A high level example of how to structure the menu is shown below.

    <script lang="ts">
  import { createDropdownMenu, melt } from '@melt-ui/svelte'
  const {
    elements: { menu, item, trigger, arrow }
  } = createDropdownMenu()
</script>
 
<button use:melt={$trigger}>Click me</button>
<div use:melt={$menu}>
  <div use:melt={$item}>...</div>
  <div use:melt={$item}>...</div>
  <div use:melt={$item}>...</div>
  <div use:melt={$arrow} />
</div>

    <script lang="ts">
  import { createDropdownMenu, melt } from '@melt-ui/svelte'
  const {
    elements: { menu, item, trigger, arrow }
  } = createDropdownMenu()
</script>
 
<button {...$trigger} use:trigger>Click me</button>
<div {...$menu} use:menu>
  <div {...$item} use:item>...</div>
  <div {...$item} use:item>...</div>
  <div {...$item} use:item>...</div>
  <div {...$arrow} use:arrow />
</div>

The trigger sits outside of the menu and is used to toggle the menu's open state. The item elements go inside the menu element. The arrow element is optional and can be used to render an arrow which points to the trigger.

At this point, our menu doesn't really do much except open and close. To add functionality, we could turn the item elements into links, or we could pass a m-click listener function to the item action, which will be called when that item is pressed (Space and Enter keys also trigger the click event for items).

    <a href="/1" use:melt={$item}>Item 1</a>
<div use:melt={$item} on:m-click={(e) => console.log('Item 2!')}>Item 2</div>
<div use:melt={$item} on:m-click={(e) => console.log('Item 3!')}>Item 3</div>

    <a href="/1" {...$item} use:item>Item 1</a>
<div {...$item} use:item on:m-click={(e) => console.log('Item 2!')}>Item 2</div>
<div {...$item} use:item on:m-click={(e) => console.log('Item 3!')}>Item 3</div>

If you wanted to prevent the default behavior that occurs when you select an item, you can call e.preventDefault() in your on:m-click listener, which will prevent the default behavior from occurring.

    <div
  use:melt={$item}
  on:m-click={(e) => {
    e.preventDefault()
  }}>
  Item 2
</div>

    <div
  {...$item} use:item
  on:m-click={(e) => {
    e.preventDefault()
  }}>
  Item 2
</div>

API Reference

createDropdownMenu

The builder function used to create the dropdown menu component.

Props

Prop	Default	Type / Description
`arrowSize`	`8`	`number` The size of the arrow which points to the trigger in pixels.
`dir`	`'ltr'`	`'ltr' \| 'rtl'` The direction of the text in the dropdown menu .
`preventScroll`	`true`	`boolean` Whether or not to prevent scrolling of the document when the dropdown menu is open.
`closeOnEscape`	`true`	`boolean` Whether or not to close the dropdown menu when the escape key is pressed.
`portal`	`body`	`string \| HTMLElement` The element or selector to render the dropdown menu into. Nested floating elements are automatically rendered into their parent if not specified.
`closeOnOutsideClick`	`true`	`boolean` Whether or not to close the dropdown menu when the user clicks outside of it.
`loop`	`false`	`boolean` Whether or not the focus should loop back to the first item when the last item is reached.
`forceVisible`	`false`	`boolean` Whether or not to force the dropdown menu to always be visible. This is useful for custom transitions and animations using conditional blocks.
`defaultOpen`	`false`	`boolean` Whether the dropdown menu is open by default or not.
`open`	-	`Writable<boolean>` A writable store that controls whether or not the dropdown menu is open. See Bring Your Own Store
`onOpenChange`	-	`ChangeFn<boolean>` A callback called when the value of the `open` store should be changed. See Change Functions
`closeFocus`	-	Override the default focus behavior on close
`ids`	-	`Record<'trigger' \| 'menu', string>` Override the internally generated ids for the elements.
`positioning`	`placement: 'bottom'`	A configuration object which determines how the floating element is positioned relative to the trigger.

Elements

Element	Description
`menu`	The builder store used to create the dropdown menu.
`trigger`	The builder store used to create the dropdown menu trigger.
`separator`	The builder store used to create a separator menu item.
`arrow`	The builder store used to create the dropdown menu arrow.
`item`	The builder store used to create the dropdown menu item
`group`	The builder store used to group menu items together. It takes in a unique key to group menu items together.
`groupLabel`	The builder store used to create the group label for the dropdown menu.

Builders

Builder	Description
`createSubmenu`	A builder function used to create a submenu for the dropdown menu.
`createRadioGroup`	A builder function used to create a radio group for the dropdown menu.
`createCheckboxItem`	A builder function used to create a checkbox menu item for the dropdown menu.

States

State	Description
`open`	A writable store that indicates whether the dropdown menu is open.

Options

Option	Description
`positioning`	A configuration object which determines how the floating element is positioned relative to the trigger.
`arrowSize`	The size of the arrow which points to the trigger in pixels.
`dir`	The direction of the text in the dropdown menu .
`preventScroll`	Whether or not to prevent scrolling of the document when the dropdown menu is open.
`closeOnEscape`	Whether or not to close the dropdown menu when the escape key is pressed.
`portal`	The element or selector to render the dropdown menu into. Nested floating elements are automatically rendered into their parent if not specified.
`closeOnOutsideClick`	Whether or not to close the dropdown menu when the user clicks outside of it.
`loop`	Whether or not the focus should loop back to the first item when the last item is reached.
`forceVisible`	Whether or not to force the dropdown menu to always be visible. This is useful for custom transitions and animations using conditional blocks.
`closeFocus`	Override the default focus behavior on close

trigger

The button which toggles the dropdown menu.

Data Attributes

Data Attribute	Value
`[data-state]`	`'open' \| 'closed'`
`[data-melt-dropdown-menu-trigger]`	Present on all trigger elements.

Custom Events

Event	Value
`m-pointerdown`	`(e: ) => void`
`m-keydown`	`(e: ) => void`

The element which wraps the entire menu.

Data Attributes

Data Attribute	Value
`[data-state]`	`'open' \| 'closed'`
`[data-melt-dropdown-menu]`	Present on all dropdown menu elements.

Custom Events

Event	Value
`m-keydown`	`(e: ) => void`

item

A basic menu item.

Props

Prop	Default	Type / Description
`disabled`	`false`	`boolean` Whether or not the item is disabled.

Data Attributes

Data Attribute	Value
`[data-orientation]`	`'vertical' \| 'horizontal'`
`[data-dropdown-menu-item]`	Present on all item elements.
`[data-highlighted]`	Present when the item is highlighted.

Custom Events

Event	Value
`m-pointerdown`	`(e: ) => void`
`m-click`	`(e: ) => void`
`m-keydown`	`(e: ) => void`
`m-pointermove`	`(e: ) => void`
`m-pointerleave`	`(e: ) => void`
`m-focusin`	`(e: ) => void`
`m-focusout`	`(e: ) => void`

separator

A horizontal line which separates menu items.

Data Attributes

Data Attribute	Value
`[data-melt-dropdown-menu-separator]`	Present on all separator elements.

arrow

An optional arrow element which points to the menu's trigger.

Data Attributes

Data Attribute	Value
`[data-arrow]`	`'true'`
`[data-melt-dropdown-menu-arrow]`	Present on all arrow elements.

createCheckboxItem

The builder function used to create checkbox items for menu elements

Props

Prop	Default	Type / Description
`disabled`	`false`	`boolean` Whether or not the menu checkbox item is disabled.
`defaultChecked`	-	`boolean` Whether the checkbox is checked by default.
`checked`	-	`Writable<boolean>` A writable store that controls the checked state of the checkbox. See Bring Your Own Store
`onCheckedChange`	-	`ChangeFn<boolean>` A function that is called when the checked state of the checkbox changes. See Bring Your Own Store

Elements

Element	Description
`checkboxItem`	The builder store used to create a menu checkbox item.

States

State	Description
`checked`	A writable store with the checked state of the checkbox item.

Options

Option	Description
`disabled`	Whether or not the submenu is disabled.

checkboxItem

A checkbox menu item.

Props

Prop	Default	Type / Description
`disabled`	`false`	`boolean` Whether or not the checkboxItem is disabled.

Data Attributes

Data Attribute	Value
`[data-orientation]`	`'vertical' \| 'horizontal'`
`[data-melt-dropdown-menu-checkbox-item]`	Present on all checkbox item elements.
`[data-highlighted]`	Present when the checkbox item is highlighted.

Custom Events

Event	Value
`m-pointerdown`	`(e: ) => void`
`m-click`	`(e: ) => void`
`m-keydown`	`(e: ) => void`
`m-pointermove`	`(e: ) => void`
`m-pointerleave`	`(e: ) => void`
`m-focusin`	`(e: ) => void`
`m-focusout`	`(e: ) => void`

createRadioGroup

The builder function used to create the radio group component.

Props

Prop	Default	Type / Description
`defaultValue`	-	`string` The value of the radio item to be selected by default.
`value`	-	`Writable<string \| null>` A writable store which controls the value of the selected radio item. This will override the `defaultValue` prop if both are provided, so ensure to set your preferred default value as the default value of the store. See Bring Your Own Store
`onValueChange`	-	`ChangeFn<string \| null>` A callback called when the value of the`value`store should be changed. See Change Functions

Elements

Element	Description
`radioGroup`	The builder store used to create the radio group.
`radioItem`	The builder store used to create a radio menu item.

States

State	Description
`value`	A writable store containing the current value of the radio group.

Helpers

Helper	Description
`isChecked`	A derived store which returns a function that checks if a radio item is selected.

radioGroup

A group of radio menu items.

Data Attributes

Data Attribute	Value
`[data-melt-dropdown-menu-radio-group]`	Present on all radio group elements.

radioItem

A radiogroup menu item.

Props

Prop	Default	Type / Description
`value` *	-	`string` The value of the radio item.
`disabled`	`false`	`boolean` Whether or not the radioItem is disabled.

Data Attributes

Data Attribute	Value
`[data-checked]`	`'checked' \| 'unchecked'`
`[data-disabled]`	Present when the radio item is disabled.
`[data-value]`	The value of the radio item.
`[data-orientation]`	`'vertical' \| 'horizontal'`
`[data-melt-dropdown-menu-radio-item]`	Present on all radio item elements.
`[data-highlighted]`	Present when the radio item is highlighted.

Custom Events

Event	Value
`m-pointerdown`	`(e: ) => void`
`m-click`	`(e: ) => void`
`m-keydown`	`(e: ) => void`
`m-pointermove`	`(e: ) => void`
`m-pointerleave`	`(e: ) => void`
`m-focusin`	`(e: ) => void`
`m-focusout`	`(e: ) => void`

group

A function which takes in a unique key to group menu items together.

Props

Prop	Default	Type / Description
`key`	-	`string` A unique key for the group.

Data Attributes

Data Attribute	Value
`[data-melt-dropdown-menu-group]`	Present on all group elements.

groupLabel

A function which takes in a unique key to group menu items together.

Props

Prop	Default	Type / Description
`key`	-	`string` A unique key for the group.

Data Attributes

Data Attribute	Value
`[data-melt-dropdown-menu-group-label]`	Present on all group-label elements.

createSubMenu

The builder function used to create submenus for context & dropdown menus.

Props

Prop	Default	Type / Description
`positioning`	`placement: 'right-start'`	A configuration object which determines how the floating element is positioned relative to the trigger.
`arrowSize`	`8`	`number` The size of the arrow which points to the trigger in pixels.
`disabled`	`false`	`boolean` Whether or not the submenu is disabled.
`open`	-	`Writable<boolean>` A writable store that controls whether or not the submenu is open. See Bring Your Own Store
`onOpenChange`	-	`ChangeFn<boolean>` A callback called when the value of the `open` store should be changed. See Change Functions
`ids`	-	`Record<'trigger' \| 'menu', string>` Override the internally generated ids for the elements.

Elements

Element	Description
`subMenu`	The builder store used to create the submenu.
`subTrigger`	The builder store used to create the submenu trigger.
`arrow`	The builder store used to create the submenu arrow.

States

State	Description
`subOpen`	A writable store with the open state of the submenu.

Options

Option	Description
`positioning`	A configuration object which determines how the floating element is positioned relative to the trigger.
`arrowSize`	The size of the arrow which points to the trigger in pixels.
`disabled`	Whether or not the submenu is disabled.

subTrigger

A button which opens its associated submenu.

Props

Prop	Default	Type / Description
`disabled`	`false`	`boolean` Whether or not the subTrigger is disabled.

Data Attributes

Data Attribute	Value
`[data-state]`	`'open' \| 'closed'`
`[data-disabled]`	Present when the subtrigger is disabled.
`[data-melt-dropdown-menu-subtrigger]`	Present on all subtrigger elements.
`[data-highlighted]`	Present when the subtrigger is highlighted.

Custom Events

Event	Value
`m-click`	`(e: ) => void`
`m-keydown`	`(e: ) => void`
`m-pointermove`	`(e: ) => void`
`m-pointerleave`	`(e: ) => void`
`m-focusin`	`(e: ) => void`
`m-focusout`	`(e: ) => void`

submenu

A submenu element displayed when its trigger is selected.

Data Attributes

Data Attribute	Value
`[data-state]`	`'open' \| 'closed'`
`[data-melt-dropdown-menu-submenu]`	Present on all submenu elements.

Custom Events

Event	Value
`m-keydown`	`(e: ) => void`
`m-pointermove`	`(e: ) => void`
`m-focusout`	`(e: ) => void`

Accessibility

Adheres to the Menu WAI-ARIA design pattern and Menu Button WAI-ARIA design pattern

Key	Behavior
`Space`	When focused on the `trigger`, opens the dropdown and focuses the first item. When focused on an `item`, selects the item.
`Enter`	When focused on the `trigger`, opens the dropdown and focuses the first item. When focused on an `item`, selects the item.
`ArrowDown`	When focused on the `trigger`, opens the dropdown and focuses the first item. When focused on an `item`, shifts focus to the next item.
`ArrowUp`	When focused on an `item`, shifts focus to the next item..
`ArrowRight`	When focused on a `subTrigger`, opens the `subMenu` and focuses the first item.
`ArrowLeft`	When focused on within a `subMenu`, closes the submenu and shifts focus to that submenu's `subTrigger`.
`Esc`	Closes the dropdown menu and focuses the `trigger`.

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