## NavMenu

Menu that provides navigation for your website.

### Top bar

Top bar NavMenu can be used in a variety of scenarios.

:::demo By default Menu is vertical, but you can change it to horizontal by setting the mode prop to 'horizontal'. In addition, you can use the sub-menu component to create a second level menu. Menu provides `background-color`, `text-color` and `active-text-color` to customize the colors.

```html
<el-menu
  :default-active="activeIndex"
  class="el-menu-demo"
  mode="horizontal"
  @select="handleSelect"
>
  <el-menu-item index="1">Processing Center</el-menu-item>
  <el-sub-menu index="2">
    <template #title>Workspace</template>
    <el-menu-item index="2-1">item one</el-menu-item>
    <el-menu-item index="2-2">item two</el-menu-item>
    <el-menu-item index="2-3">item three</el-menu-item>
    <el-sub-menu index="2-4">
      <template #title>item four</template>
      <el-menu-item index="2-4-1">item one</el-menu-item>
      <el-menu-item index="2-4-2">item two</el-menu-item>
      <el-menu-item index="2-4-3">item three</el-menu-item>
    </el-sub-menu>
  </el-sub-menu>
  <el-menu-item index="3" disabled>Info</el-menu-item>
  <el-menu-item index="4">Orders</el-menu-item>
</el-menu>
<div class="line"></div>
<el-menu
  :default-active="activeIndex2"
  class="el-menu-demo"
  mode="horizontal"
  @select="handleSelect"
  background-color="#545c64"
  text-color="#fff"
  active-text-color="#ffd04b"
>
  <el-menu-item index="1">Processing Center</el-menu-item>
  <el-sub-menu index="2">
    <template #title>Workspace</template>
    <el-menu-item index="2-1">item one</el-menu-item>
    <el-menu-item index="2-2">item two</el-menu-item>
    <el-menu-item index="2-3">item three</el-menu-item>
    <el-sub-menu index="2-4">
      <template #title>item four</template>
      <el-menu-item index="2-4-1">item one</el-menu-item>
      <el-menu-item index="2-4-2">item two</el-menu-item>
      <el-menu-item index="2-4-3">item three</el-menu-item>
    </el-sub-menu>
  </el-sub-menu>
  <el-menu-item index="3" disabled>Info</el-menu-item>
  <el-menu-item index="4">Orders</el-menu-item>
</el-menu>

<script>
  export default {
    data() {
      return {
        activeIndex: '1',
        activeIndex2: '1',
      }
    },
    methods: {
      handleSelect(key, keyPath) {
        console.log(key, keyPath)
      },
    },
  }
</script>
<!--
<setup>

  import { defineComponent, ref } from 'vue';

  export default defineComponent({
    setup() {
      const activeIndex = ref('1');
      const activeIndex2 = ref('1');
      const handleSelect = (key, keyPath) => {
        console.log(key, keyPath);
      };
      return {
        activeIndex,
        activeIndex2,
        handleSelect,
      };
    },
  });

</setup>
-->
```

:::

### Side bar

Vertical NavMenu with sub-menus.

:::demo You can use the el-menu-item-group component to create a menu group, and the name of the group is determined by the title prop or a named slot.

```html
<el-row class="tac">
  <el-col :span="12">
    <h5>Default colors</h5>
    <el-menu
      default-active="2"
      class="el-menu-vertical-demo"
      @open="handleOpen"
      @close="handleClose"
    >
      <el-sub-menu index="1">
        <template #title>
          <i class="el-icon-location"></i>
          <span>Navigator One</span>
        </template>
        <el-menu-item-group title="Group One">
          <el-menu-item index="1-1">item one</el-menu-item>
          <el-menu-item index="1-2">item one</el-menu-item>
        </el-menu-item-group>
        <el-menu-item-group title="Group Two">
          <el-menu-item index="1-3">item three</el-menu-item>
        </el-menu-item-group>
        <el-sub-menu index="1-4">
          <template #title>item four</template>
          <el-menu-item index="1-4-1">item one</el-menu-item>
        </el-sub-menu>
      </el-sub-menu>
      <el-menu-item index="2">
        <i class="el-icon-menu"></i>
        <span>Navigator Two</span>
      </el-menu-item>
      <el-menu-item index="3" disabled>
        <i class="el-icon-document"></i>
        <span>Navigator Three</span>
      </el-menu-item>
      <el-menu-item index="4">
        <i class="el-icon-setting"></i>
        <span>Navigator Four</span>
      </el-menu-item>
    </el-menu>
  </el-col>
  <el-col :span="12">
    <h5>Custom colors</h5>
    <el-menu
      default-active="2"
      class="el-menu-vertical-demo"
      @open="handleOpen"
      @close="handleClose"
      background-color="#545c64"
      text-color="#fff"
      active-text-color="#ffd04b"
    >
      <el-sub-menu index="1">
        <template #title>
          <i class="el-icon-location"></i>
          <span>Navigator One</span>
        </template>
        <el-menu-item-group title="Group One">
          <el-menu-item index="1-1">item one</el-menu-item>
          <el-menu-item index="1-2">item one</el-menu-item>
        </el-menu-item-group>
        <el-menu-item-group title="Group Two">
          <el-menu-item index="1-3">item three</el-menu-item>
        </el-menu-item-group>
        <el-sub-menu index="1-4">
          <template #title>item four</template>
          <el-menu-item index="1-4-1">item one</el-menu-item>
        </el-sub-menu>
      </el-sub-menu>
      <el-menu-item index="2">
        <i class="el-icon-menu"></i>
        <span>Navigator Two</span>
      </el-menu-item>
      <el-menu-item index="3" disabled>
        <i class="el-icon-document"></i>
        <span>Navigator Three</span>
      </el-menu-item>
      <el-menu-item index="4">
        <i class="el-icon-setting"></i>
        <span>Navigator Four</span>
      </el-menu-item>
    </el-menu>
  </el-col>
</el-row>

<script>
  export default {
    methods: {
      handleOpen(key, keyPath) {
        console.log(key, keyPath)
      },
      handleClose(key, keyPath) {
        console.log(key, keyPath)
      },
    },
  }
</script>
<!--
<setup>

  import { defineComponent } from 'vue';

  export default defineComponent({
    setup() {
      const handleOpen = (key, keyPath) => {
        console.log(key, keyPath);
      };
      const handleClose = (key, keyPath) => {
        console.log(key, keyPath);
      };
      return {
        handleOpen,
        handleClose,
      };
    },
  });

</setup>
-->
```

:::

### Collapse

Vertical NavMenu could be collapsed.

:::demo

```html
<el-radio-group v-model="isCollapse" style="margin-bottom: 20px;">
  <el-radio-button :label="false">expand</el-radio-button>
  <el-radio-button :label="true">collapse</el-radio-button>
</el-radio-group>
<el-menu
  default-active="2"
  class="el-menu-vertical-demo"
  @open="handleOpen"
  @close="handleClose"
  :collapse="isCollapse"
>
  <el-sub-menu index="1">
    <template #title>
      <i class="el-icon-location"></i>
      <span>Navigator One</span>
    </template>
    <el-menu-item-group>
      <template #title><span>Group One</span></template>
      <el-menu-item index="1-1">item one</el-menu-item>
      <el-menu-item index="1-2">item two</el-menu-item>
    </el-menu-item-group>
    <el-menu-item-group title="Group Two">
      <el-menu-item index="1-3">item three</el-menu-item>
    </el-menu-item-group>
    <el-sub-menu index="1-4">
      <template #title><span>item four</span></template>
      <el-menu-item index="1-4-1">item one</el-menu-item>
    </el-sub-menu>
  </el-sub-menu>
  <el-menu-item index="2">
    <i class="el-icon-menu"></i>
    <template #title>Navigator Two</template>
  </el-menu-item>
  <el-menu-item index="3" disabled>
    <i class="el-icon-document"></i>
    <template #title>Navigator Three</template>
  </el-menu-item>
  <el-menu-item index="4">
    <i class="el-icon-setting"></i>
    <template #title>Navigator Four</template>
  </el-menu-item>
</el-menu>

<style>
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
  }
</style>

<script>
  export default {
    data() {
      return {
        isCollapse: true,
      }
    },
    methods: {
      handleOpen(key, keyPath) {
        console.log(key, keyPath)
      },
      handleClose(key, keyPath) {
        console.log(key, keyPath)
      },
    },
  }
</script>
<!--
<setup>

  import { defineComponent, ref } from 'vue';

  export default defineComponent({
    setup() {
      const isCollapse = ref(true);
      const handleOpen = (key, keyPath) => {
        console.log(key, keyPath);
      };
      const handleClose = (key, keyPath) => {
        console.log(key, keyPath);
      };
      return {
        isCollapse,
        handleOpen,
        handleClose,
      };
    },
  });

</setup>
-->
```

:::

### Menu Attributes

| Attribute           | Description                                                                                                | Type    | Accepted Values       | Default  |
| ------------------- | ---------------------------------------------------------------------------------------------------------- | ------- | --------------------- | -------- |
| mode                | menu display mode                                                                                          | string  | horizontal / vertical | vertical |
| collapse            | whether the menu is collapsed (available only in vertical mode)                                            | boolean | —                     | false    |
| background-color    | background color of Menu (hex format)                                                                      | string  | —                     | #ffffff  |
| text-color          | text color of Menu (hex format)                                                                            | string  | —                     | #303133  |
| active-text-color   | text color of currently active menu item (hex format)                                                      | string  | —                     | #409EFF  |
| default-active      | index of currently active menu                                                                             | string  | —                     | —        |
| default-openeds     | array that contains indexes of currently active sub-menus                                                  | Array   | —                     | —        |
| unique-opened       | whether only one sub-menu can be active                                                                    | boolean | —                     | false    |
| menu-trigger        | how sub-menus are triggered, only works when `mode` is 'horizontal'                                        | string  | hover / click         | hover    |
| router              | whether `vue-router` mode is activated. If true, index will be used as 'path' to activate the route action | boolean | —                     | false    |
| collapse-transition | whether to enable the collapse transition                                                                  | boolean | —                     | true     |

### Menu Methods

| Methods Name | Description               | Parameters                            |
| ------------ | ------------------------- | ------------------------------------- |
| open         | open a specific sub-menu  | index: index of the sub-menu to open  |
| close        | close a specific sub-menu | index: index of the sub-menu to close |

### Menu Events

| Event Name | Description                               | Parameters                                                                                                                                                                 |
| ---------- | ----------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| select     | callback function when menu is activated  | index: index of activated menu, indexPath: index path of activated menu, item: the selected menu item, routeResult: result returned by `vue-router` if `router` is enabled |
| open       | callback function when sub-menu expands   | index: index of expanded sub-menu, indexPath: index path of expanded sub-menu                                                                                              |
| close      | callback function when sub-menu collapses | index: index of collapsed sub-menu, indexPath: index path of collapsed sub-menu                                                                                            |

### Menu-Item Events

| Event Name | Description                                 | Parameters             |
| ---------- | ------------------------------------------- | ---------------------- |
| click      | callback function when menu-item is clicked | el: menu-item instance |

### SubMenu Attributes

| Attribute             | Description                                                                                                      | Type    | Accepted Values | Default                                         |
| --------------------- | ---------------------------------------------------------------------------------------------------------------- | ------- | --------------- | ----------------------------------------------- |
| index                 | unique identification                                                                                            | string  | —               | —                                               |
| popper-class          | custom class name for the popup menu                                                                             | string  | —               | —                                               |
| show-timeout          | timeout before showing a sub-menu                                                                                | number  | —               | 300                                             |
| hide-timeout          | timeout before hiding a sub-menu                                                                                 | number  | —               | 300                                             |
| disabled              | whether the sub-menu is disabled                                                                                 | boolean | —               | false                                           |
| popper-append-to-body | whether to append the popup menu to body. If the positioning of the menu is wrong, you can try setting this prop | boolean | -               | level one SubMenu: true / other SubMenus: false |

### Menu-Item Attributes

| Attribute | Description           | Type        | Accepted Values | Default |
| --------- | --------------------- | ----------- | --------------- | ------- |
| index     | unique identification | string/null | —               | null    |
| route     | Vue Router object     | object      | —               | —       |
| disabled  | whether disabled      | boolean     | —               | false   |

### Menu-Item-Group Attributes

| Attribute | Description | Type   | Accepted Values | Default |
| --------- | ----------- | ------ | --------------- | ------- |
| title     | group title | string | —               | —       |