最近在用 iview-admin的Vue後臺模板,從git上下載後發現左側導航欄最多支持到二級菜單,也發現不少童鞋在問如何實現三級菜單。在實際的應用場景中仍是會出現三級菜單的需求的,木有其餘好辦法,只能本身手動改代碼了。vue
1. 第一步:首先改寫VUE中的模板,修改sidebarMenu.vue文件,文件具體目錄建下圖:ios
將Menu導航菜單組件的的二級嵌套結構改成三級嵌套,無非就是判斷二級路由頁面下是否有children屬性及是否含有子元素,有的話直接v-for循環生成子元素標籤,新結構以下:git
<template> <Menu ref="sideMenu" :active-name="$route.name" :open-names="openNames" :theme="menuTheme" width="auto" @on-select="changeMenu"> <template v-for="item in menuList"> <MenuItem v-if="item.children.length<=1" :name="item.children[0].name" :key="'menuitem' + item.name"> <Icon :type="item.children[0].icon || item.icon" :size="iconSize" :key="'menuicon' + item.name"></Icon> <span class="layout-text" :key="'title' + item.name">{{ itemTitle(item.children[0]) }}</span> </MenuItem> <Submenu v-if="item.children.length > 1" :name="item.name" :key="item.name"> <template slot="title"> <Icon :type="item.icon" :size="iconSize"></Icon> <span class="layout-text">{{ itemTitle(item) }}</span> </template> <template v-for="child in item.children"> <!-- 添加條件判斷是否還有三級菜單 v-if="child.children.length<=1" --> <MenuItem v-if="isThirdLeveMenu(child)==false" :name="child.name" :key="'menuitem' + child.name"> <Icon :type="child.icon" :size="iconSize" :key="'icon' + child.name"></Icon> <span class="layout-text" :key="'title' + child.name">{{ itemTitle(child) }}</span> </MenuItem> <!-- 如下爲新增 添加條件判斷若是有三級菜單 則增長三級菜單 --> <Submenu v-if="isThirdLeveMenu(child)==true" :name="child.name" :key="'menuitem' + child.name"> <template slot="title"> <Icon :type="child.icon" :size="iconSize" :key="'icon' + child.name"></Icon> <span class="layout-text" :key="'title' + child.name">{{ itemTitle(child) }}</span> </template> <template v-for="son in child.children"> <MenuItem :name="son.name" :key="'menuitem' + son.name"> <Icon :type="son.icon" :size="iconSize" :key="'icon' + son.name"></Icon> <span class="layout-text" :key="'title' + son.name">{{ itemTitle(son) }}</span> </MenuItem> </template> </Submenu> <!-- 以上爲新增 --> </template> </Submenu> </template> </Menu> </template>
組件中methods下添加一個方法isThirdLeveMenu,判斷是否含有children屬性:數組
methods: { changeMenu(active) { this.$emit("on-change", active); }, itemTitle(item) { if (typeof item.title === "object") { return this.$t(item.title.i18n); } else { return item.title; } }, isThirdLeveMenu(child){ if(child.children){ if(child.children.length>0)return true; else return false; } else { return false; } } },
第二步:修改建立當前path路徑的邏輯方法:setCurrentPath ,在libs文件夾下util.js文件中:app
util.setCurrentPath = function (vm, name) { let title = ''; let isOtherRouter = false; vm.$store.state.app.routers.forEach(item => { if (item.children.length === 1) { if (item.children[0].name === name) { title = util.handleTitle(vm, item); if (item.name === 'otherRouter') { isOtherRouter = true; } } } else { item.children.forEach(child => { if (child.name === name) { title = util.handleTitle(vm, child); if (item.name === 'otherRouter') { isOtherRouter = true; } } }); } }); let currentPathArr = []; //去首頁 if (name === 'home_index') { currentPathArr = [ { title: util.handleTitle(vm, util.getRouterObjByName(vm.$store.state.app.routers, 'home_index')), path: '', name: 'home_index' } ]; } //去導航菜單一級頁面或者OtherRouter路由中的頁面 else if ((name.indexOf('_index') >= 0 || isOtherRouter) && name !== 'home_index') { currentPathArr = [ { title: util.handleTitle(vm, util.getRouterObjByName(vm.$store.state.app.routers, 'home_index')), path: '/home', name: 'home_index' }, { title: title, path: '', name: name } ]; } //去導航菜單二級頁面或三級頁面 else { let currentPathObj = vm.$store.state.app.routers.filter(item => { var hasMenu; if (item.children.length <= 1) { hasMenu = item.children[0].name === name; return hasMenu; } else { let i = 0; let childArr = item.children; let len = childArr.length; while (i < len) { //若是是三級頁面按鈕,則在二級按鈕數組中找不到這個按鈕名稱 //須要二級頁面下可能出現三級子菜單的狀況邏輯加入 if (childArr[i].name === name) { hasMenu = true; return hasMenu; } i++; } //若是一級,二級菜單下都沒有此按鈕名稱,則遍歷三級菜單 if(!hasMenu){ for(let m=0;m<childArr.length;m++){ if(!childArr[m].children) continue; let sonArr = childArr[m].children; for(let n=0;n<sonArr.length;n++){ if(sonArr[n].name === name){ hasMenu = true; return hasMenu; } } } } return false; } })[0]; if (currentPathObj.children.length <= 1 && currentPathObj.name === 'home') { currentPathArr = [ { title: '首頁', path: '', name: 'home_index' } ]; } else if (currentPathObj.children.length <= 1 && currentPathObj.name !== 'home') { currentPathArr = [ { title: '首頁', path: '/home', name: 'home_index' }, { title: currentPathObj.title, path: '', name: name } ]; } else { //若是是三級頁面按鈕,則在二級按鈕數組中找不到這個按鈕名稱 //須要二級頁面下可能出現三級子菜單的狀況邏輯加入 let childObj = currentPathObj.children.filter((child) => { return child.name === name; })[0]; // let thirdLevelObj = console.log(childObj) //二級頁面 if (childObj) { currentPathArr = [ { title: '首頁', path: '/home', name: 'home_index' }, { title: currentPathObj.title, path: '', name: currentPathObj.name }, { title: childObj.title, path: currentPathObj.path + '/' + childObj.path, name: name } ]; } //childobj爲undefined,再從三級頁面中遍歷 else { let thirdObj; let childObj = currentPathObj.children.filter((child) => { let hasChildren; hasChildren = child.name === name; if (hasChildren) return hasChildren if (child.children) { let sonArr = child.children; for (let n = 0; n < sonArr.length; n++) { if (sonArr[n].name === name) { thirdObj = sonArr[n]; hasChildren = true; return hasChildren; } } } return hasChildren })[0]; if(thirdObj && childObj){ currentPathArr = [ { title: '首頁', path: '/home', name: 'home_index' }, { title: currentPathObj.title, path: '', name: currentPathObj.name }, { title: childObj.title, path: '', //設爲空是由於此二級菜單沒有實際頁面且用於麪包屑組件顯示,path爲空的將不可單擊 name: childObj.name }, { title: thirdObj.title, path: currentPathObj.path + '/' + childObj.path + '/' + thirdObj.path, name: thirdObj.name } ]; } } } } vm.$store.commit('setCurrentPath', currentPathArr); return currentPathArr; };
第三步:創建三級頁面test-child.vue,testcaca.vue和三級路由的容器組件artical-publish-center.vue
artical-publish-center.vue結構以下圖: 要有<rout-view>標籤iview
其餘兩個三級頁面vue隨便寫了:ide
第四步:到這裏,容器能夠實現期待已久三級菜單了,^_^. 在router裏添加三級頁面路由,router文件夾下router.js中:
加到appRouter中吧,能夠放到title: '組件'的children數組中:ui
{ path: 'artical-publish', title: '用戶配置', name: 'artical-publish', icon: 'compose', component: () => import('@/views/test/artical-publish-center.vue'), //引用三級頁面的中間容器層 children:[ { path: 'testcaca', icon: 'ios-pause', name: 'testcaca', title: 'test4', component: () => import('@/views/test/testcaca.vue') }, { path: 'test-child', icon: 'ios-pause', name: 'test-child', title: 'test-child', component: () => import('@/views/test/test-child.vue') } ] }
最後保存,運行你的項目,看下三級菜單出來了吧:this