dropdown.md 9.1 KB
title: Dropdown
lang: en-US
Dropdown
Toggleable menu for displaying lists of links and actions.
Basic usage
Hover on the dropdown menu to unfold it for more actions.
:::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.
dropdown/basic-usage
:::
Triggering element
Use the button to trigger the dropdown list.
:::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.
dropdown/triggering-element
:::
How to trigger
Click the triggering element or hover on it.
:::demo Use the attribute trigger. By default, it is hover.
dropdown/how-to-trigger
:::
Menu hiding behavior
Use hide-on-click to define if menu closes on clicking.
:::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.
dropdown/menu-hiding-behavior
:::
Command event
Clicking each dropdown item fires an event whose parameter is assigned by each item.
:::demo
dropdown/command-event
:::
Dropdown methods
You can open or close the dropdown menu by manually use handleOpen or handleClose
:::demo
dropdown/dropdown-methods
:::
Sizes
Besides default size, Dropdown component provides three additional sizes for you to choose among different scenarios.
:::demo Use attribute size to set additional sizes with large, default or small.
dropdown/sizes
:::
Dropdown Attributes
| Name | Description | Type | Accepted Values | Default |
|---|---|---|---|---|
| type | menu button type, refer to Button Component, only works when split-button is true |
string | — | — |
| size | menu size, also works on the split button | string | large / default / small | default |
| max-height | the max height of menu | string / number | — | — |
| split-button | whether a button group is displayed | boolean | — | false |
| disabled | Whether to disable | boolean | — | false |
| placement | placement of pop menu | string | top/top-start/top-end/bottom/bottom-start/bottom-end | bottom |
| trigger | how to trigger | string | hover/click/contextmenu | hover |
| hide-on-click | whether to hide menu after clicking menu-item | boolean | — | true |
| show-timeout | Delay time before show a dropdown (only works when trigger is hover) |
number | — | 250 |
| hide-timeout | Delay time before hide a dropdown (only works when trigger is hover) |
number | — | 150 |
| role | The ARIA role attribute for the dropdown menu. Depending on the use case, you may want to change this to 'navigation' | string | — | 'menu' |
| tabindex | tabindex of Dropdown | number | — | 0 |
| popper-class | custom class name for Dropdown's dropdown | string | — | — |
| popper-options | popper.js parameters | Object | refer to popper.js doc | {modifiers: [{name: 'computeStyles',options: {gpuAcceleration: false}}]} |
Dropdown Slots
| Name | Description | Subtags |
|---|---|---|
| — | content of Dropdown. Notice: Must be a valid html dom element (ex. <span>, <button> etc.) or el-component, to attach the trigger listener |
— |
| dropdown | content of the Dropdown Menu, usually a <el-dropdown-menu> element |
Dropdown-Menu |
Dropdown Events
| Name | Description | Parameters |
|---|---|---|
| click | if split-button is true, triggers when left button is clicked |
— |
| command | triggers when a dropdown item is clicked | the command dispatched from the dropdown item |
| visible-change | triggers when the dropdown appears/disappears | true when it appears, and false otherwise |
Dropdown Methods
| Method | Description | Parameters |
|---|---|---|
| handleOpen | open the dropdown menu | — |
| handleClose | close the dropdown menu | — |
Dropdown-Menu Slots
| Name | Description | Subtags |
|---|---|---|
| — | content of Dropdown Menu | Dropdown-Item |
Dropdown-Item Attributes
| Name | Description | Type | Accepted Values | Default |
|---|---|---|---|---|
| command | a command to be dispatched to Dropdown's command callback |
string/number/object | — | — |
| disabled | whether the item is disabled | boolean | — | false |
| divided | whether a divider is displayed | boolean | — | false |
| icon | custom icon | string \| Component |
— | — |
Dropdown-Item Slots
| Name | Description |
|---|---|
| — | customize of Dropdown Item |