最近在用 iview-admin的Vue后台模板,从git上下载后发现左侧导航栏最多支持到二级菜单,也发现很多童鞋在问如何实现三级菜单。在实际的应用场景中还是会出现三级菜单的需求的,木有其他好办法,只能自己手动改代码了。
第一步:首先改写VUE中的模板,修改sidebarMenu.vue文件,文件具体目录建下图:
将Menu导航菜单组件的的二级嵌套结构改为三级嵌套,无非就是判断二级路由页面下是否有children属性及是否含有子元素,有的话直接v-for循环生成子元素标签,新结构如下:
组件中methods下添加一个方法:
第二步:修改创建当前path路径的逻辑方法:setCurrentPath ,在libs文件夹下util.js文件中:
'''
util.setCurrentPath = function (vm, name) {
let title = '';
let isOtherRouter = false;
vm.$store.state.app.routers.forEach(item => {
if (item.children.length === 1) {
if (item.children[0].name === name) {
title = util.handleTitle(vm, item);
if (item.name === 'otherRouter') {
isOtherRouter = true;
}
}
} else {
item.children.forEach(child => {
if (child.name === name) {
title = util.handleTitle(vm, child);
if (item.name === 'otherRouter') {
isOtherRouter = true;
}
}
});
}
});
let currentPathArr = [];
//去首页
if (name === 'home_index') {
currentPathArr = [
{
title: util.handleTitle(vm, util.getRouterObjByName(vm.$store.state.app.routers, 'home_index')),
path: '',
name: 'home_index'
}
];
}
//去导航菜单一级页面或者OtherRouter路由中的页面
else if ((name.indexOf('_index') >= 0 || isOtherRouter) && name !== 'home_index') {
currentPathArr = [
{
title:util.handleTitle(vm,util.getRouterObjByName(vm.$store.state.app.routers,'home_index')),
path: '/home',
name: 'home_index'
},
{
title: title,
path: '',
name: name
}
];
}
//去导航菜单二级页面或三级页面
else {
let currentPathObj = vm.$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) {
//如果是三级页面按钮,则在二级按钮数组中找不到这个按钮名称
//需要二级页面下可能出现三级子菜单的情况逻辑加入
if (childArr[i].name === name) {
hasMenu = true;
return hasMenu;
}
i++;
}
//如果一级,二级菜单下都没有此按钮名称,则遍历三级菜单
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: '首页',
path: '',
name: 'home_index'
}
];
} else if (currentPathObj.children.length <= 1 && currentPathObj.name !== 'home') {
currentPathArr = [
{
title: '首页',
path: '/home',
name: 'home_index'
},
{
title: currentPathObj.title,
path: '',
name: name
}
];
} else {
//如果是三级页面按钮,则在二级按钮数组中找不到这个按钮名称
//需要二级页面下可能出现三级子菜单的情况逻辑加入
let childObj = currentPathObj.children.filter((child) => {
return child.name === name;
})[0];
// let thirdLevelObj =
console.log(childObj)
//二级页面
if (childObj) {
currentPathArr = [
{
title: '首页',
path: '/home',
name: 'home_index'
},
{
title: currentPathObj.title,
path: '',
name: currentPathObj.name
},
{
title: childObj.title,
path: currentPathObj.path + '/' + childObj.path,
name: name
}
];
}
//childobj为undefined,再从三级页面中遍历
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: '首页',
path: '/home',
name: 'home_index'
},
{
title: currentPathObj.title,
path: '',
name: currentPathObj.name
},
{
title: childObj.title,
path: '', //设为空是因为此二级菜单没有实际页面且用于面包屑组件显示,path为空的将不可单击
name: childObj.name
},
{
title: thirdObj.title,
path: currentPathObj.path + '/' + childObj.path + '/' + thirdObj.path,
name: thirdObj.name
}
];
}
}
}
}
vm.$store.commit('setCurrentPath', currentPathArr);
return currentPathArr;
};
'''
谁能告诉我简书的代码块怎么这么难用啊,有的代码格式显示不正常。。。。。。。。
第三步:建立三级页面test-child.vue,testcaca.vue和三级路由的容器组件artical-publish-center.vue
artical-publish-center.vue结构如下图: 要有<rout-view>标签
其他两个三级页面vue随便写了:
第四步:到这里,容器可以实现期待已久三级菜单了,_. 在router里添加三级页面路由,router文件夹下router.js中:
加到appRouter中吧,可以放到title: '组件'的children数组中:
然后保存,运行你的项目,看下三级菜单出来了吧: