laws_weilai/jero-web/src/components/menu/index.js

import Menu from 'ant-design-vue/es/menu'
import Icon from 'ant-design-vue/es/icon'

const { Item, SubMenu } = Menu

export default {
  name: 'SMenu',
  props: {
    menu: {
      type: Array,
      required: true
    },
    theme: {
      type: String,
      required: false,
      default: 'dark'
    },
    mode: {
      type: String,
      required: false,
      default: 'inline'
    },
    collapsed: {
      type: Boolean,
      required: false,
      default: false
    }
  },
  data() {
    return {
      openKeys: [],
      selectedKeys: [],
      cachedOpenKeys: []
    }
  },
  computed: {
    rootSubmenuKeys: vm => {
      const keys = []
      vm.menu.forEach(item => keys.push(item.path))
      return keys
    }
  },
  mounted() {
    this.updateMenu()
  },
  watch: {
    collapsed(val) {
      if (val) {
        this.cachedOpenKeys = this.openKeys.concat()
        this.openKeys = []
      } else {
        this.openKeys = this.cachedOpenKeys
      }
    },
    $route: function() {
      this.updateMenu()
    }
  },
  methods: {
    // select menu item
    onOpenChange(openKeys) {
      // 在水平模式下时执行，并且不再执行后续
      if (this.mode === 'horizontal') {
        this.openKeys = openKeys
        return
      }
      // 非水平模式时
      const latestOpenKey = openKeys.find(key => !this.openKeys.includes(key))
      if (!this.rootSubmenuKeys.includes(latestOpenKey)) {
        this.openKeys = openKeys
      } else {
        this.openKeys = latestOpenKey ? [latestOpenKey] : []
      }
    },
    updateMenu() {
      const routes = this.$route.matched.concat()
      const { hidden } = this.$route.meta
      if (routes.length >= 3 && hidden) {
        routes.pop()
        this.selectedKeys = [routes[routes.length - 1].path]
      } else {
        this.selectedKeys = [routes.pop().path]
      }
      const openKeys = []
      if (this.mode === 'inline') {
        routes.forEach(item => {
          openKeys.push(item.path)
        })
      }
      //update-begin-author:taoyan date:20190510 for:online表单菜单点击展开的一级目录不对
      if (!this.selectedKeys || this.selectedKeys[0].indexOf(':') < 0) {
        this.collapsed ? (this.cachedOpenKeys = openKeys) : (this.openKeys = openKeys)
      }
      //update-end-author:taoyan date:20190510 for:online表单菜单点击展开的一级目录不对
    },

    // render
    renderItem(menu) {
      if (!menu.hidden) {
        return menu.children && !menu.alwaysShow ? this.renderSubMenu(menu) : this.renderMenuItem(menu)
      }
      return null
    },
    renderMenuItem(menu) {
      const target = menu.meta.target || null
      const tag = target && 'a' || 'router-link'
      let props = { to: { name: menu.name } }
      if (menu.route && menu.route === '0') {
        props = { to: { path: menu.path } }
      }

      const attrs = { href: menu.path, target: menu.meta.target , title:menu.meta.title }

      if (menu.children && menu.alwaysShow) {
        // 把有子菜单的 并且 父菜单是要隐藏子菜单的
        // 都给子菜单增加一个 hidden 属性
        // 用来给刷新页面时， selectedKeys 做控制用
        menu.children.forEach(item => {
          item.meta = Object.assign(item.meta, { hidden: true })
        })
      }

      return (
        < Item
      {...
        {
          key: menu.path
        }
      }
    >
    <
      tag
      {...
        {
          props, attrs
        }
      }
    >
      {
        this.renderIcon(menu.meta.icon)
      }
    <
      span > { menu.meta.title } < /span>
      < /tag>
      < /Item>
    )
    },
    renderSubMenu(menu) {
      const itemArr = []
      if (!menu.alwaysShow) {
        menu.children.forEach(item => itemArr.push(this.renderItem(item)))
      }
      return (
        < SubMenu
      {...
        {
          key: menu.path
        }
      }
    >
    <
      span
      slot = 'title' >
        { this.renderIcon(menu.meta.icon) }
        < span title={menu.meta.title}> { menu.meta.title } < /span>
        < /span>
      {
        itemArr
      }
    <
      /SubMenu>
    )
    },
    renderIcon(icon) {
      if (icon === 'none' || icon === undefined) {
        return null
      }
      const props = {}
      typeof (icon) === 'object' ? props.component = icon : props.type = icon
      return (
        < Icon
      {...
        {
          props
        }
      }
      />
    )
    }
  },

  render() {
    const { mode, theme, menu } = this
    const props = {
      mode: mode,
      theme: theme,
      openKeys: this.openKeys
    }
    const on = {
      select: obj => {
        this.selectedKeys = obj.selectedKeys
        this.$emit('select', obj)
      },
      openChange: this.onOpenChange
    }

    const menuTree = menu.map(item => {
      if (item.hidden) {
        return null
      }
      return this.renderItem(item)
    })
    // {...{ props, on: on }}
    return (
      < Menu
    vModel = { this.selectedKeys }
    {...
      {
        props, on
      :
        on
      }
    }
  >
    {
      menuTree
    }
  <
    /Menu>
  )
  }
}