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140 lines
8.4 KiB
Markdown
140 lines
8.4 KiB
Markdown
---
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title: Dropdown
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lang: en-US
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---
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# Dropdown
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Toggleable menu for displaying lists of links and actions.
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## Basic usage
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Hover on the dropdown menu to unfold it for more actions.
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:::demo The triggering element is rendered by the default `slot`, and the dropdown part is rendered by the `slot` named `dropdown`. By default, dropdown list shows when you hover on the triggering element without having to click it.
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dropdown/basic-usage
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:::
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## Triggering element
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Use the button to trigger the dropdown list.
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:::demo Use `split-button` to split the triggering element into a button group with the left button being a normal button and right one the actual triggering target. If you wanna insert a separator line between item three and item four, just add a class `divider` to item four.
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dropdown/triggering-element
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:::
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## How to trigger
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Click the triggering element or hover on it.
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:::demo Use the attribute `trigger`. By default, it is `hover`.
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dropdown/how-to-trigger
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:::
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## Menu hiding behavior
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Use `hide-on-click` to define if menu closes on clicking.
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:::demo By default menu will close when you click on menu items, and it can be turned off by setting hide-on-click to false.
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dropdown/menu-hiding-behavior
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:::
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## Command event
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Clicking each dropdown item fires an event whose parameter is assigned by each item.
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:::demo
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dropdown/command-event
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:::
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## Dropdown methods
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You can open or close the dropdown menu by manually use `handleOpen` or `handleClose`
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:::demo
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dropdown/dropdown-methods
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:::
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## Sizes
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Besides default size, Dropdown component provides three additional sizes for you to choose among different scenarios.
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:::demo Use attribute `size` to set additional sizes with `large`, `default` or `small`.
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dropdown/sizes
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:::
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## Dropdown Attributes
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| Attribute | Description | Type | Accepted Values | Default |
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| -------------- | ---------------------------------------------------------------------------------------------------- | --------------- | ------------------------------------------------------------------ | ------------------------------------------------------- |
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| type | menu button type, refer to `Button` Component, only works when `split-button` is true | string | — | — |
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| size | menu size, also works on the split button | string | large / default / small | default |
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| max-height | the max height of menu | string / number | — | — |
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| split-button | whether a button group is displayed | boolean | — | false |
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| disabled | Whether to disable | boolean | — | false |
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| placement | placement of pop menu | string | top/top-start/top-end/bottom/bottom-start/bottom-end | bottom |
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| trigger | how to trigger | string | hover/click/contextmenu | hover |
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| hide-on-click | whether to hide menu after clicking menu-item | boolean | — | true |
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| show-timeout | Delay time before show a dropdown (only works when trigger is `hover`) | number | — | 250 |
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| hide-timeout | Delay time before hide a dropdown (only works when trigger is `hover`) | number | — | 150 |
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| tabindex | [tabindex](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/tabindex) of Dropdown | number | — | 0 |
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| popper-class | custom class name for Dropdown's dropdown | string | — | — |
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| popper-options | [popper.js](https://popper.js.org/documentation.html) parameters | Object | refer to [popper.js](https://popper.js.org/documentation.html) doc | `{ boundariesElement: 'body', gpuAcceleration: false }` |
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## Dropdown Slots
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| Name | Description | Subtags |
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| -------- | --------------------------------------------------------------------------------------------------------------------------------------------- | ------------- |
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| — | content of Dropdown. Notice: Must be a valid html dom element (ex. `<span>, <button> etc.`) or `el-component`, to attach the trigger listener | — |
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| dropdown | content of the Dropdown Menu, usually a `<el-dropdown-menu>` element | Dropdown-Menu |
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## Dropdown Events
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| Event Name | Description | Parameters |
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| -------------- | ----------------------------------------------------------------- | --------------------------------------------- |
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| click | if `split-button` is `true`, triggers when left button is clicked | — |
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| command | triggers when a dropdown item is clicked | the command dispatched from the dropdown item |
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| visible-change | triggers when the dropdown appears/disappears | true when it appears, and false otherwise |
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## Dropdown Methods
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| Method | Description | Parameters |
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| ----------- | ----------------------- | ---------- |
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| handleOpen | open the dropdown menu | — |
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| handleClose | close the dropdown menu | — |
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## Dropdown-Menu Slots
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| Name | Description | Subtags |
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| ---- | ------------------------ | ------------- |
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| — | content of Dropdown Menu | Dropdown-Item |
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## Dropdown-Item Attributes
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| Attribute | Description | Type | Accepted Values | Default |
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| --------- | ----------------------------------------------------------- | -------------------- | --------------- | ------- |
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| command | a command to be dispatched to Dropdown's `command` callback | string/number/object | — | — |
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| disabled | whether the item is disabled | boolean | — | false |
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| divided | whether a divider is displayed | boolean | — | false |
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| icon | custom icon | string / Component | — | — |
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## Dropdown-Item Slots
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| Name | Description |
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| ---- | -------------------------- |
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| — | customize of Dropdown Item |
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