Vue开发实例（十）Tabs标签页打开、关闭与路由之间的关系-编程知识

创建标签页

一、创建标签页
二、点击菜单展示新标签页
- 1、将标签数据作为全局使用
- 2、菜单点击增加标签页
- 3、处理重复标签
- 4、关闭标签页
三、点击标签页操作
- 问题1：点击标签页选中菜单进行高亮展示
- 问题2：点击标签页路由也要跳转
四、解决bug

先展示最终效果
在这里插入图片描述

一、创建标签页

创建一个Tabs/index.vue页面

<template><div><el-tabs v-model="editableTabsValue" type="card" closable><el-tab-pane:key="item.name"v-for="item in editableTabs":label="item.title":name="item.name"></el-tab-pane></el-tabs></div>
</template><script>
export default {name: "Tabss",data() {return {editableTabsValue: "1",editableTabs: [{title: "首页",name: "1",content: "首页",},{title: "Tab 1",name: "2",content: "Tab 1 content",},{title: "Tab 2",name: "3",content: "Tab 2 content",},],tabIndex: 1,};},
};
</script><style scoped>
div{height: auto;
}
</style>

修改Index.vue页面，在页面的路由锚点 router-view上方引入此页面

页面效果

二、点击菜单展示新标签页

1、将标签数据作为全局使用

（1）将数据放到store.js中，作为全局

import Vue from 'vue'
import Vuex from 'vuex'
import moduleA from './module/moduleA.js';
import moduleB from './module/moduleB.js';Vue.use(Vuex)const state = {username: '牛牛',userState: 0,menu_data: [],isLoadRoute: false,editableTabsValue: '1',editableTabs: [{title: '首页',name: '首页',content: '首页'},{title: 'Tab 1',name: '2',content: 'Tab 1 content'},{title: 'Tab 2',name: '3',content: 'Tab 2 content'}]
}
const mutations = {setLoadRoute(state, data) {state.isLoadRoute = data},setUser(state, name) {state.username = name},setUserState(state, data) {state.userState += data},setMenuData(state, data) {state.menu_data = data},}
const getters = {getUserState(state) {let data;if (state.userState == 0) {data = '无效'} else {data = state.userState + '级'}return data;}
}
const modules = {a: moduleA,b: moduleB
}export default new Vuex.Store({state,mutations,getters,modules
})

（2）Tabs/index.vue 中的这两个数据 editableTabsValue 和 editableTabs 就从store中获取

注意：

如果你的在data中这样写，可能会无法正常显示，建议用computed 方式来写。

<template><div><el-tabs v-model="editableTabsValue" type="card" closable><el-tab-pane:key="item.name"v-for="item in editableTabs":label="item.title":name="item.name"></el-tab-pane></el-tabs></div>
</template><script>
export default {name: "Tabs",data() {return {};},computed: {editableTabsValue: {get() {return this.$store.state.editableTabsValue;},set(val) {this.$store.state.editableTabsValue = val;},},editableTabs: {get() {return this.$store.state.editableTabs;},set(val) {this.$store.state.editableTabs = val;},},},
};
</script><style scoped>
div {height: auto;
}
</style>

页面效果是一样的
在这里插入图片描述

2、菜单点击增加标签页

（1）在 store/index.js 中将写死的数据editableTabs 内容删除，只剩下首页的那条
（2）在mutations添加 editableTabs 数据变更的方法 addEditableTabs，因为我定义的菜单数据的时候，没有title属性，所以这里我都用title来代表

参考代码：

import Vue from 'vue'
import Vuex from 'vuex'
import moduleA from './module/moduleA.js';
import moduleB from './module/moduleB.js';Vue.use(Vuex)const state = {username: '牛牛',userState: 0,menu_data: [],isLoadRoute: false,editableTabsValue: '1',editableTabs: [{title: '首页',name: '首页',content: '首页'}]
}
const mutations = {setLoadRoute(state, data) {state.isLoadRoute = data},setUser(state, name) {state.username = name},setUserState(state, data) {state.userState += data},setMenuData(state, data) {state.menu_data = data},addEditableTabs(state, tab) {state.editableTabs.push({title: tab.name,name: tab.name})state.editableTabsValue = tab.name}
}
const getters = {getUserState(state) {let data;if (state.userState == 0) {data = '无效'} else {data = state.userState + '级'}return data;}
}
const modules = {a: moduleA,b: moduleB
}export default new Vuex.Store({state,mutations,getters,modules
})

（3）给Aside/index.vue菜单增加点事件，selectMenu方法

<template><div style="height: 100%"><el-menubackground-color="#545c64"text-color="#ffffff"active-text-color="#ffd04b"class="el-menu-vertical-demo"router><el-menu-item:index="item.path"v-for="item in menu_data":key="item.name"@click="selectMenu(item)"><i :class="item.icon"></i>{{ item.name }}</el-menu-item></el-menu></div>
</template><script>
export default {name: "Aside",data() {return {};},computed: {menu_data: {get() {return this.$store.state.menu_data;},},},methods: {selectMenu(item) {this.$store.commit("addEditableTabs", item);},},
};
</script><style scoped>
.el-icon-location,
.el-icon-document,
.el-icon-setting {display: inline-flex;align-items: center;justify-content: center;
}
</style>

页面效果
在这里插入图片描述
问题：出现重复菜单名称标签

3、处理重复标签

在store/index.js文件中的addEditableTabs 中判断，如果数据中已经有了，则不重复添加，只需切换即可
在这里插入图片描述

页面效果
在这里插入图片描述
现在就只有两个标签了，目前展示正常，但是没法关闭

4、关闭标签页

标签页添加关闭事件

在el-tabs标签中添加 @tab-remove="removeTab"，在method添加对应的方法

<template><div><el-tabsv-model="editableTabsValue"type="card"closable@tab-remove="removeTab"><el-tab-pane:key="item.name"v-for="item in editableTabs":label="item.title":name="item.name"></el-tab-pane></el-tabs></div>
</template><script>
export default {name: "Tabs",data() {return {};},methods: {removeTab(targetName) {let tabs = this.editableTabs;let activeName = this.editableTabsValue;if (activeName === targetName) {tabs.forEach((tab, index) => {if (tab.name === targetName) {let nextTab = tabs[index + 1] || tabs[index - 1];if (nextTab) {activeName = nextTab.name;}}});}this.editableTabsValue = activeName;this.editableTabs = tabs.filter((tab) => tab.name !== targetName);},},computed: {editableTabsValue: {get() {return this.$store.state.editableTabsValue;},set(val) {this.$store.state.editableTabsValue = val;},},editableTabs: {get() {return this.$store.state.editableTabs;},set(val) {this.$store.state.editableTabs = val;},},},
};
</script><style scoped>
div {height: auto;
}
</style>

页面效果
在这里插入图片描述

问题：

选中菜单，侧边栏没有进行对应的高亮展示
关闭了“一级菜单2”，但是页面内容还停留在“一级菜单2”，其实就是路由没有变

三、点击标签页操作

问题1：点击标签页选中菜单进行高亮展示

在Aside/index.vue中给 el-menu 设置属性 default-active

:default-active="this.$store.state.editableTabsValue"

将原来代码el-menu-item的index设置为"item.name"

:index="item.name"

加入路由跳转代码

因原来菜单点击，会根据index属性来跳转，index原来是path（路由地址），现在index属性更改为name了，则跳转不会生效，修改原来的router.js的代码，动态创建路由加入name属性（name:item.name），方便跳转。

修改router/index.js 代码

let oRouters = router.options.routes;
const buildRouter = ()=>{let data = store.state.menu_data;data.forEach(item=>{let new_router = {path:item.path,name:item.name,component:() => import('./components/'+item.component+'.vue')}oRouters[0].children.push(new_router);})router.addRoutes(oRouters)
}

在Aside/index.vue的 selectMenu方法中，加入路由跳转代码（根据name跳转），仅需一行代码即可。

selectMenu(item){//点击菜单跳转路由this.$router.push({name:item.name})this.$store.commit("addEditableTabs",item);
}

页面效果，可以实现点击标签页，菜单跟着高亮显示了
在这里插入图片描述
Aside/index.vue 页面代码

<template><div style="height: 100%"><el-menubackground-color="#545c64"text-color="#ffffff"active-text-color="#ffd04b"class="el-menu-vertical-demo"router:default-active="this.$store.state.editableTabsValue"><el-menu-item:index="item.name"v-for="item in menu_data":key="item.name"@click="selectMenu(item)"><i :class="item.icon"></i>{{ item.name }}</el-menu-item></el-menu></div>
</template><script>
export default {name: "Aside",data() {return {};},computed: {menu_data: {get() {return this.$store.state.menu_data;},},},methods: {selectMenu(item) {//点击菜单跳转路由this.$router.push({ name: item.name });this.$store.commit("addEditableTabs", item);},},
};
</script><style scoped>
.el-icon-location,
.el-icon-document,
.el-icon-setting {display: inline-flex;align-items: center;justify-content: center;
}
</style>

问题2：点击标签页路由也要跳转

上面遗留的问题2，点击标签页，标签页下方的页面没有跟着跳转，下面修改这个问题

在Tabs页面的 el-tabs 添加 tab-click 事件
添加方法，利用路由的name来跳转

<template><div><el-tabsv-model="editableTabsValue"type="card"closable@tab-remove="removeTab"@tab-click="clickTab"><el-tab-pane:key="item.name"v-for="item in editableTabs":label="item.title":name="item.name"></el-tab-pane></el-tabs></div>
</template><script>
export default {name: "Tabs",data() {return {};},methods: {removeTab(targetName) {let tabs = this.editableTabs;let activeName = this.editableTabsValue;if (activeName === targetName) {tabs.forEach((tab, index) => {if (tab.name === targetName) {let nextTab = tabs[index + 1] || tabs[index - 1];if (nextTab) {activeName = nextTab.name;}}});}this.editableTabsValue = activeName;this.editableTabs = tabs.filter((tab) => tab.name !== targetName);},clickTab(target) {this.$router.push({ name: target.name });},},computed: {editableTabsValue: {get() {return this.$store.state.editableTabsValue;},set(val) {this.$store.state.editableTabsValue = val;},},editableTabs: {get() {return this.$store.state.editableTabs;},set(val) {this.$store.state.editableTabs = val;},},},
};
</script><style scoped>
div {height: auto;
}
</style>

效果展示
在这里插入图片描述

四、解决bug

关闭菜单后，菜单对应的路由没有跟着跳转
仅需在关闭标签的方法removeTab，最后加上以下代码

this.$router.push({name:activeName})

首页不允许关闭
在关闭标签的方法removeTab ，执行关闭之前，加入以下代码

if(targetName=='首页'){return ;
}

完整removeTab 代码

removeTab(targetName) {let tabs = this.editableTabs;let activeName = this.editableTabsValue;if(targetName=='首页'){return ;}if (activeName === targetName) {tabs.forEach((tab, index) => {if (tab.name === targetName) {let nextTab = tabs[index + 1] || tabs[index - 1];if (nextTab) {activeName = nextTab.name;}}});}this.editableTabsValue = activeName;this.editableTabs = tabs.filter(tab => tab.name !== targetName);this.$router.push({name:activeName})
}

还有一个潜藏的bug就是打开、关闭的顺序问题，先关闭前面的菜单会报错，后面解决

在这里插入图片描述报错代码如下

Uncaught runtime errors:Avoided redundant navigation to current location: "/index/menu2".NavigationDuplicated: Avoided redundant navigation to current location: "/index/menu2".at createRouterError (webpack-internal:///./node_modules/vue-router/dist/vue-router.esm.js:1720:15)at createNavigationDuplicatedError (webpack-internal:///./node_modules/vue-router/dist/vue-router.esm.js:1708:15)at HTML5History.confirmTransition (webpack-internal:///./node_modules/vue-router/dist/vue-router.esm.js:1946:18)at HTML5History.transitionTo (webpack-internal:///./node_modules/vue-router/dist/vue-router.esm.js:1887:8)at HTML5History.push (webpack-internal:///./node_modules/vue-router/dist/vue-router.esm.js:2165:10)at eval (webpack-internal:///./node_modules/vue-router/dist/vue-router.esm.js:2510:22)at new Promise (<anonymous>)at VueRouter.push (webpack-internal:///./node_modules/vue-router/dist/vue-router.esm.js:2509:12)at VueComponent.removeTab (webpack-internal:///./node_modules/babel-loader/lib/index.js??clonedRuleSet-40.use[0]!./node_modules/@vue/vue-loader-v15/lib/index.js??vue-loader-options!./src/components/Tabs/index.vue?vue&type=script&lang=js:29:20)at invokeWithErrorHandling (webpack-internal:///./node_modules/vue/dist/vue.runtime.esm.js:2903:26)