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  • Dropdown 下拉菜单

    将动作或菜单折叠到下拉菜单中。

    基础用法

    移动到下拉菜单上，展开更多操作。

    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。

     1 <el-dropdown>
 2   <span class="el-dropdown-link">
 3     下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
 4   </span>
 5   <el-dropdown-menu slot="dropdown">
 6     <el-dropdown-item>黄金糕</el-dropdown-item>
 7     <el-dropdown-item>狮子头</el-dropdown-item>
 8     <el-dropdown-item>螺蛳粉</el-dropdown-item>
 9     <el-dropdown-item disabled>双皮奶</el-dropdown-item>
10     <el-dropdown-item divided>蚵仔煎</el-dropdown-item>
11   </el-dropdown-menu>
12 </el-dropdown>
    View Code

    触发对象

    可使用按钮触发下拉菜单。

    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。

     1 <el-dropdown>
 2   <el-button type="primary">
 3     更多菜单<i class="el-icon-arrow-down el-icon--right"></i>
 4   </el-button>
 5   <el-dropdown-menu slot="dropdown">
 6     <el-dropdown-item>黄金糕</el-dropdown-item>
 7     <el-dropdown-item>狮子头</el-dropdown-item>
 8     <el-dropdown-item>螺蛳粉</el-dropdown-item>
 9     <el-dropdown-item>双皮奶</el-dropdown-item>
10     <el-dropdown-item>蚵仔煎</el-dropdown-item>
11   </el-dropdown-menu>
12 </el-dropdown>
13 <el-dropdown split-button type="primary" @click="handleClick">
14   更多菜单
15   <el-dropdown-menu slot="dropdown">
16     <el-dropdown-item>黄金糕</el-dropdown-item>
17     <el-dropdown-item>狮子头</el-dropdown-item>
18     <el-dropdown-item>螺蛳粉</el-dropdown-item>
19     <el-dropdown-item>双皮奶</el-dropdown-item>
20     <el-dropdown-item>蚵仔煎</el-dropdown-item>
21   </el-dropdown-menu>
22 </el-dropdown>
23 
24 <style>
25   .el-dropdown {
26     vertical-align: top;
27   }
28   .el-dropdown + .el-dropdown {
29     margin-left: 15px;
30   }
31   .el-icon-arrow-down {
32     font-size: 12px;
33   }
34 </style>
35 
36 <script>
37   export default {
38     methods: {
39       handleClick() {
40         alert('button click');
41       }
42     }
43   }
44 </script>
    View Code

    触发方式

    可以配置 click 激活或者 hover 激活。

    在trigger属性设置为click即可。

     1 <el-row class="block-col-2">
 2   <el-col :span="12">
 3     <span class="demonstration">hover 激活</span>
 4     <el-dropdown>
 5       <span class="el-dropdown-link">
 6         下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
 7       </span>
 8       <el-dropdown-menu slot="dropdown">
 9         <el-dropdown-item>黄金糕</el-dropdown-item>
10         <el-dropdown-item>狮子头</el-dropdown-item>
11         <el-dropdown-item>螺蛳粉</el-dropdown-item>
12         <el-dropdown-item>双皮奶</el-dropdown-item>
13         <el-dropdown-item>蚵仔煎</el-dropdown-item>
14       </el-dropdown-menu>
15     </el-dropdown>
16   </el-col>
17   <el-col :span="12">
18     <span class="demonstration">click 激活</span>
19     <el-dropdown trigger="click">
20       <span class="el-dropdown-link">
21         下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
22       </span>
23       <el-dropdown-menu slot="dropdown">
24         <el-dropdown-item>黄金糕</el-dropdown-item>
25         <el-dropdown-item>狮子头</el-dropdown-item>
26         <el-dropdown-item>螺蛳粉</el-dropdown-item>
27         <el-dropdown-item>双皮奶</el-dropdown-item>
28         <el-dropdown-item>蚵仔煎</el-dropdown-item>
29       </el-dropdown-menu>
30     </el-dropdown>
31   </el-col>
32 </el-row>
    View Code

    菜单隐藏方式

    可以hide-on-click属性来配置。

    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。

     1 <el-dropdown :hide-on-click="false">
 2   <span class="el-dropdown-link">
 3     下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
 4   </span>
 5   <el-dropdown-menu slot="dropdown">
 6     <el-dropdown-item>黄金糕</el-dropdown-item>
 7     <el-dropdown-item>狮子头</el-dropdown-item>
 8     <el-dropdown-item>螺蛳粉</el-dropdown-item>
 9     <el-dropdown-item disabled>双皮奶</el-dropdown-item>
10     <el-dropdown-item divided>蚵仔煎</el-dropdown-item>
11   </el-dropdown-menu>
12 </el-dropdown>
13 
14 <style>
15   .el-dropdown-link {
16     cursor: pointer;
17     color: #409EFF;
18   }
19   .el-icon-arrow-down {
20     font-size: 12px;
21   }
22 </style>
    View Code

    指令事件

    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

     1 <el-dropdown @command="handleCommand">
 2   <span class="el-dropdown-link">
 3     下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
 4   </span>
 5   <el-dropdown-menu slot="dropdown">
 6     <el-dropdown-item command="a">黄金糕</el-dropdown-item>
 7     <el-dropdown-item command="b">狮子头</el-dropdown-item>
 8     <el-dropdown-item command="c">螺蛳粉</el-dropdown-item>
 9     <el-dropdown-item command="d" disabled>双皮奶</el-dropdown-item>
10     <el-dropdown-item command="e" divided>蚵仔煎</el-dropdown-item>
11   </el-dropdown-menu>
12 </el-dropdown>
13 
14 <style>
15   .el-dropdown-link {
16     cursor: pointer;
17     color: #409EFF;
18   }
19   .el-icon-arrow-down {
20     font-size: 12px;
21   }
22 </style>
23 
24 <script>
25   export default {
26     methods: {
27       handleCommand(command) {
28         this.$message('click on item ' + command);
29       }
30     }
31   }
32 </script>
    View Code

    不同尺寸

    Dropdown 组件提供除了默认值以外的三种尺寸，可以在不同场景下选择合适的尺寸。

    额外的尺寸：medium、small、mini，通过设置size属性来配置它们。

     1 <el-dropdown split-button type="primary">
 2   默认尺寸
 3   <el-dropdown-menu slot="dropdown">
 4     <el-dropdown-item>黄金糕</el-dropdown-item>
 5     <el-dropdown-item>狮子头</el-dropdown-item>
 6     <el-dropdown-item>螺蛳粉</el-dropdown-item>
 7     <el-dropdown-item>双皮奶</el-dropdown-item>
 8     <el-dropdown-item>蚵仔煎</el-dropdown-item>
 9   </el-dropdown-menu>
10 </el-dropdown>
11 
12 <el-dropdown size="medium" split-button type="primary">
13   中等尺寸
14   <el-dropdown-menu slot="dropdown">
15     <el-dropdown-item>黄金糕</el-dropdown-item>
16     <el-dropdown-item>狮子头</el-dropdown-item>
17     <el-dropdown-item>螺蛳粉</el-dropdown-item>
18     <el-dropdown-item>双皮奶</el-dropdown-item>
19     <el-dropdown-item>蚵仔煎</el-dropdown-item>
20   </el-dropdown-menu>
21 </el-dropdown>
22 
23 <el-dropdown size="small" split-button type="primary">
24   小型尺寸
25   <el-dropdown-menu slot="dropdown">
26     <el-dropdown-item>黄金糕</el-dropdown-item>
27     <el-dropdown-item>狮子头</el-dropdown-item>
28     <el-dropdown-item>螺蛳粉</el-dropdown-item>
29     <el-dropdown-item>双皮奶</el-dropdown-item>
30     <el-dropdown-item>蚵仔煎</el-dropdown-item>
31   </el-dropdown-menu>
32 </el-dropdown>
33 
34 <el-dropdown size="mini" split-button type="primary">
35   超小尺寸
36   <el-dropdown-menu slot="dropdown">
37     <el-dropdown-item>黄金糕</el-dropdown-item>
38     <el-dropdown-item>狮子头</el-dropdown-item>
39     <el-dropdown-item>螺蛳粉</el-dropdown-item>
40     <el-dropdown-item>双皮奶</el-dropdown-item>
41     <el-dropdown-item>蚵仔煎</el-dropdown-item>
42   </el-dropdown-menu>
43 </el-dropdown>
    View Code
    参数说明类型可选值默认值
    type 菜单按钮类型，同 Button 组件(只在split-button为 true 的情况下有效) string — —
    size 菜单尺寸，在split-button为 true 的情况下也对触发按钮生效 string medium / small / mini —
    split-button 下拉触发元素呈现为按钮组 boolean — false
    placement 菜单弹出位置 string top/top-start/top-end/bottom/bottom-start/bottom-end bottom-end
    trigger 触发下拉的行为 string hover, click hover
    hide-on-click 是否在点击菜单项后隐藏菜单 boolean — true
    show-timeout 展开下拉菜单的延时（仅在 trigger 为 hover 时有效） number — 250
    hide-timeout 收起下拉菜单的延时（仅在 trigger 为 hover 时有效） number — 150
    事件名称说明回调参数
    click split-button 为 true 时，点击左侧按钮的回调 —
    command 点击菜单项触发的事件回调 dropdown-item 的指令
    visible-change 下拉框出现/隐藏时触发 出现则为 true，隐藏则为 false
    参数说明类型可选值默认值
    command 指令 string/number/object — —
    disabled 禁用 boolean — false
    divided 显示分割线 boolean — false
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  • 原文地址：https://www.cnblogs.com/grt322/p/8564449.html
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