304 lines
10 KiB
Markdown
304 lines
10 KiB
Markdown
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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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```html
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<el-dropdown>
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<span class="el-dropdown-link">
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Dropdown List<i class="el-icon-arrow-down el-icon--right"></i>
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</span>
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<el-dropdown-menu slot="dropdown">
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<el-dropdown-item>Action 1</el-dropdown-item>
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<el-dropdown-item>Action 2</el-dropdown-item>
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<el-dropdown-item>Action 3</el-dropdown-item>
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<el-dropdown-item disabled>Action 4</el-dropdown-item>
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<el-dropdown-item divided>Action 5</el-dropdown-item>
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</el-dropdown-menu>
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</el-dropdown>
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<style>
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.el-dropdown-link {
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cursor: pointer;
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color: #409EFF;
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}
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.el-icon-arrow-down {
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font-size: 12px;
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}
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</style>
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```
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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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```html
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<el-dropdown>
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<el-button type="primary">
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Dropdown List<i class="el-icon-arrow-down el-icon--right"></i>
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</el-button>
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<el-dropdown-menu slot="dropdown">
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<el-dropdown-item>Action 1</el-dropdown-item>
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<el-dropdown-item>Action 2</el-dropdown-item>
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<el-dropdown-item>Action 3</el-dropdown-item>
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<el-dropdown-item>Action 4</el-dropdown-item>
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<el-dropdown-item>Action 5</el-dropdown-item>
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</el-dropdown-menu>
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</el-dropdown>
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<el-dropdown split-button type="primary" @click="handleClick">
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Dropdown List
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<el-dropdown-menu slot="dropdown">
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<el-dropdown-item>Action 1</el-dropdown-item>
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<el-dropdown-item>Action 2</el-dropdown-item>
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<el-dropdown-item>Action 3</el-dropdown-item>
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<el-dropdown-item>Action 4</el-dropdown-item>
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<el-dropdown-item>Action 5</el-dropdown-item>
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</el-dropdown-menu>
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</el-dropdown>
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<style>
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.el-dropdown {
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vertical-align: top;
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}
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.el-dropdown + .el-dropdown {
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margin-left: 15px;
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}
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.el-icon-arrow-down {
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font-size: 12px;
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}
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</style>
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<script>
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export default {
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methods: {
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handleClick() {
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alert('button click');
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}
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}
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}
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</script>
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```
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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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```html
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<el-row class="block-col-2">
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<el-col :span="12">
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<span class="demonstration">hover to trigger</span>
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<el-dropdown>
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<span class="el-dropdown-link">
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Dropdown List<i class="el-icon-arrow-down el-icon--right"></i>
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</span>
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<el-dropdown-menu slot="dropdown">
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<el-dropdown-item icon="el-icon-plus">Action 1</el-dropdown-item>
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<el-dropdown-item icon="el-icon-circle-plus">Action 2</el-dropdown-item>
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<el-dropdown-item icon="el-icon-circle-plus-outline">Action 3</el-dropdown-item>
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<el-dropdown-item icon="el-icon-check">Action 4</el-dropdown-item>
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<el-dropdown-item icon="el-icon-circle-check">Action 5</el-dropdown-item>
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</el-dropdown-menu>
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</el-dropdown>
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</el-col>
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<el-col :span="12">
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<span class="demonstration">click to trigger</span>
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<el-dropdown trigger="click">
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<span class="el-dropdown-link">
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Dropdown List<i class="el-icon-arrow-down el-icon--right"></i>
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</span>
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<el-dropdown-menu slot="dropdown">
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<el-dropdown-item icon="el-icon-plus">Action 1</el-dropdown-item>
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<el-dropdown-item icon="el-icon-circle-plus">Action 2</el-dropdown-item>
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<el-dropdown-item icon="el-icon-circle-plus-outline">Action 3</el-dropdown-item>
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<el-dropdown-item icon="el-icon-check">Action 4</el-dropdown-item>
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<el-dropdown-item icon="el-icon-circle-check">Action 5</el-dropdown-item>
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</el-dropdown-menu>
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</el-dropdown>
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</el-col>
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</el-row>
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<style>
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.el-dropdown-link {
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cursor: pointer;
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color: #409EFF;
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}
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.el-icon-arrow-down {
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font-size: 12px;
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}
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.demonstration {
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display: block;
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color: #8492a6;
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font-size: 14px;
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margin-bottom: 20px;
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}
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</style>
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```
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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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```html
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<el-dropdown :hide-on-click="false">
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<span class="el-dropdown-link">
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Dropdown List<i class="el-icon-arrow-down el-icon--right"></i>
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</span>
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<el-dropdown-menu slot="dropdown">
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<el-dropdown-item>Action 1</el-dropdown-item>
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<el-dropdown-item>Action 2</el-dropdown-item>
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<el-dropdown-item>Action 3</el-dropdown-item>
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<el-dropdown-item disabled>Action 4</el-dropdown-item>
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<el-dropdown-item divided>Action 5</el-dropdown-item>
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</el-dropdown-menu>
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</el-dropdown>
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<style>
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.el-dropdown-link {
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cursor: pointer;
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color: #409EFF;
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}
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.el-icon-arrow-down {
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font-size: 12px;
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}
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</style>
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```
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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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```html
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<el-dropdown @command="handleCommand">
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<span class="el-dropdown-link">
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Dropdown List<i class="el-icon-arrow-down el-icon--right"></i>
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</span>
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<el-dropdown-menu slot="dropdown">
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<el-dropdown-item command="a">Action 1</el-dropdown-item>
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<el-dropdown-item command="b">Action 2</el-dropdown-item>
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<el-dropdown-item command="c">Action 3</el-dropdown-item>
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<el-dropdown-item command="d" disabled>Action 4</el-dropdown-item>
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<el-dropdown-item command="e" divided>Action 5</el-dropdown-item>
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</el-dropdown-menu>
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</el-dropdown>
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<style>
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.el-dropdown-link {
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cursor: pointer;
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color: #409EFF;
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}
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.el-icon-arrow-down {
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font-size: 12px;
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}
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</style>
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<script>
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export default {
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methods: {
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handleCommand(command) {
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this.$message('click on item ' + command);
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}
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}
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}
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</script>
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```
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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 `medium`, `small` or `mini`.
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```html
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<el-dropdown split-button type="primary">
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Default
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<el-dropdown-menu slot="dropdown">
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<el-dropdown-item>Action 1</el-dropdown-item>
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<el-dropdown-item>Action 2</el-dropdown-item>
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<el-dropdown-item>Action 3</el-dropdown-item>
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<el-dropdown-item>Action 4</el-dropdown-item>
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</el-dropdown-menu>
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</el-dropdown>
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<el-dropdown size="medium" split-button type="primary">
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Medium
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<el-dropdown-menu slot="dropdown">
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<el-dropdown-item>Action 1</el-dropdown-item>
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<el-dropdown-item>Action 2</el-dropdown-item>
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<el-dropdown-item>Action 3</el-dropdown-item>
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<el-dropdown-item>Action 4</el-dropdown-item>
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</el-dropdown-menu>
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</el-dropdown>
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<el-dropdown size="small" split-button type="primary">
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Small
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<el-dropdown-menu slot="dropdown">
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<el-dropdown-item>Action 1</el-dropdown-item>
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<el-dropdown-item>Action 2</el-dropdown-item>
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<el-dropdown-item>Action 3</el-dropdown-item>
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<el-dropdown-item>Action 4</el-dropdown-item>
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</el-dropdown-menu>
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</el-dropdown>
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<el-dropdown size="mini" split-button type="primary">
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Mini
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<el-dropdown-menu slot="dropdown">
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<el-dropdown-item>Action 1</el-dropdown-item>
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<el-dropdown-item>Action 2</el-dropdown-item>
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<el-dropdown-item>Action 3</el-dropdown-item>
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<el-dropdown-item>Action 4</el-dropdown-item>
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</el-dropdown-menu>
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</el-dropdown>
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```
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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 | medium / small / mini | — |
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| split-button | whether a button group is displayed | boolean | — | false |
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| placement | placement of pop menu | string | top/top-start/top-end/bottom/bottom-start/bottom-end | bottom-end |
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| trigger | how to trigger | string | hover/click | 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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### Dropdown Slots
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| Name | Description |
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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 |
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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 Menu 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 | icon class name | string | — | — |
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