mirror of https://github.com/ElemeFE/element
227 lines
7.2 KiB
Markdown
227 lines
7.2 KiB
Markdown
<style>
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.demo-box {
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.el-dropdown {
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vertical-align: top;
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& + .el-dropdown {
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margin-left: 15px;
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}
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}
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.el-dropdown-link {
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cursor: pointer;
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color: #20a0ff;
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}
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.el-icon-caret-bottom {
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font-size: 12px;
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}
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}
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.block-col-2 {
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margin: -24px;
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.el-col {
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padding: 30px 0;
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text-align: center;
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border-right: 1px solid #eff2f6;
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&:last-child {
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border-right: 0;
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}
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}
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}
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.demo-dropdown .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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<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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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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## Dropdown 下拉菜单
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将动作或菜单折叠到下拉菜单中。
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### 基础用法
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移动到下拉菜单上，展开更多操作。
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:::demo 通过组件`slot`来设置下拉触发的元素以及需要通过具名`slot`为`dropdown` 来设置下拉菜单。默认情况下，下拉按钮只要`hover`即可，无需点击也会显示下拉菜单。
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```html
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<el-dropdown>
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<span class="el-dropdown-link">
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下拉菜单<i class="el-icon-caret-bottom 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>黄金糕</el-dropdown-item>
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<el-dropdown-item>狮子头</el-dropdown-item>
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<el-dropdown-item>螺蛳粉</el-dropdown-item>
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<el-dropdown-item disabled>双皮奶</el-dropdown-item>
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<el-dropdown-item divided>蚵仔煎</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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### 触发对象
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可使用按钮触发下拉菜单。
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:::demo 设置`split-button`属性来让触发下拉元素呈现为按钮组，左边是功能按钮，右边是触发下拉菜单的按钮，设置为`true`即可。
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```html
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<el-dropdown>
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<el-button type="primary">
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更多菜单<i class="el-icon-caret-bottom 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>黄金糕</el-dropdown-item>
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<el-dropdown-item>狮子头</el-dropdown-item>
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<el-dropdown-item>螺蛳粉</el-dropdown-item>
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<el-dropdown-item>双皮奶</el-dropdown-item>
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<el-dropdown-item>蚵仔煎</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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更多菜单
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<el-dropdown-menu slot="dropdown">
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<el-dropdown-item>黄金糕</el-dropdown-item>
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<el-dropdown-item>狮子头</el-dropdown-item>
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<el-dropdown-item>螺蛳粉</el-dropdown-item>
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<el-dropdown-item>双皮奶</el-dropdown-item>
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<el-dropdown-item>蚵仔煎</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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### 触发方式
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可以配置 click 激活或者 hover 激活。
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:::demo 在`trigger`属性设置为`click`即可。
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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 激活</span>
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<el-dropdown>
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<span class="el-dropdown-link">
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下拉菜单<i class="el-icon-caret-bottom 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>黄金糕</el-dropdown-item>
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<el-dropdown-item>狮子头</el-dropdown-item>
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<el-dropdown-item>螺蛳粉</el-dropdown-item>
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<el-dropdown-item>双皮奶</el-dropdown-item>
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<el-dropdown-item>蚵仔煎</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 激活</span>
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<el-dropdown trigger="click">
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<span class="el-dropdown-link">
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下拉菜单<i class="el-icon-caret-bottom 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>黄金糕</el-dropdown-item>
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<el-dropdown-item>狮子头</el-dropdown-item>
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<el-dropdown-item>螺蛳粉</el-dropdown-item>
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<el-dropdown-item>双皮奶</el-dropdown-item>
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<el-dropdown-item>蚵仔煎</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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```
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:::
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### 菜单隐藏方式
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可以`hide-on-click`属性来配置。
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:::demo 下拉菜单默认在点击菜单项后会被隐藏，将`hide-on-click`属性默认为`false`可以关闭此功能。
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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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下拉菜单<i class="el-icon-caret-bottom 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>黄金糕</el-dropdown-item>
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<el-dropdown-item>狮子头</el-dropdown-item>
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<el-dropdown-item>螺蛳粉</el-dropdown-item>
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<el-dropdown-item disabled>双皮奶</el-dropdown-item>
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<el-dropdown-item divided>蚵仔煎</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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### 指令事件
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点击菜单项后会触发事件，用户可以通过相应的菜单项 key 进行不同的操作
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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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下拉菜单<i class="el-icon-caret-bottom 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">黄金糕</el-dropdown-item>
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<el-dropdown-item command="b">狮子头</el-dropdown-item>
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<el-dropdown-item command="c">螺蛳粉</el-dropdown-item>
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<el-dropdown-item command="d" disabled>双皮奶</el-dropdown-item>
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<el-dropdown-item command="e" divided>蚵仔煎</el-dropdown-item>
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</el-dropdown-menu>
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</el-dropdown>
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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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### Dropdown Attributes
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| 参数 | 说明 | 类型 | 可选值 | 默认值 |
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|------------- |---------------- |---------------- |---------------------- |-------- |
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| type | 菜单按钮类型，同 Button 组件(只在`split-button`为 true 的情况下有效) | string | — | — |
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| size | 菜单按钮尺寸，同 Button 组件(只在`split-button`为 true 的情况下有效) | string | — | — |
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| split-button | 下拉触发元素呈现为按钮组 | boolean | — | false |
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| placement | 菜单弹出位置 | string | top/top-start/top-end/bottom/bottom-start/bottom-end | bottom-end |
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| trigger | 触发下拉的行为 | string | hover, click | hover |
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| hide-on-click | 是否在点击菜单项后隐藏菜单 | boolean | — | true |
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### Dropdown Events
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| 事件名称 | 说明 | 回调参数 |
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|---------- |-------- |---------- |
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| click | `split-button` 为 true 时，点击左侧按钮的回调 | — |
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| command | 点击菜单项触发的事件回调 | dropdown-item 的指令 |
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| visible-change | 下拉框出现/隐藏时触发 | 出现则为 true，隐藏则为 false |
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### Dropdown Menu Item Attributes
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| 参数 | 说明 | 类型 | 可选值 | 默认值 |
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|------------- |---------------- |---------------- |---------------------- |-------- |
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| command | 指令 | string/number/object | — | — |
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| disabled | 禁用 | boolean | — | false |
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| divided | 显示分割线 | boolean | — | false |
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