需求
是要做一個tag，當切換頁面的時候保留狀態。
效果圖：
思路
既然涉及了router跳轉，那我們就去查api 發現keep-alive，巧了就用它吧。這里我們用到了include屬性，該屬性接受一個數組，當組件的name名稱包含在inclue里的時候就會觸發keep-alive。
import { Vue, Component, Watch, Mixins } from "vue-property-decorator";
// 此處省略n行代碼
// 這是個計算屬性。（至于為什么這么寫 這里就不介紹了。）
get cachedViews():string[] {
return this.$store.state.tagsView.cachedViews;
}
// 此處省略n行代碼
<keep-alive :include="cachedViews">
<router-view :key="key"></router-view>
</keep-alive>
那我們接下來就處理cachedViews變量就好了。
vuex實現
import { Route } from "vue-router"; // 檢測規則
interface TagsState{
visitedViews: Route[];
cachedViews: string[];
}
const state = (): TagsState => ({
visitedViews: [], // 展示的菜單
cachedViews: [], // 緩存菜單 用來activeed
});
const mutations = {
ADD_VISITED_VIEW: (state: TagsState, view: Route) => {
if (state.visitedViews.some((v: any) => v.path === view.path)) { return; }
state.visitedViews.push(
Object.assign({}, view, {
title: view.meta.title || "no-name",
}),
);
},
ADD_CACHED_VIEW: (state: TagsState, view: Route) => {
if (state.cachedViews.includes(view.meta.name)) { return; }
if (!view.meta.noCache) {
state.cachedViews.push(view.meta.name);
}
},
DEL_VISITED_VIEW: (state: TagsState, view: Route) => {
for (const [i, v] of state.visitedViews.entries()) {
if (v.path === view.path) {
state.visitedViews.splice(i, 1);
break;
}
}
},
DEL_CACHED_VIEW: (state: TagsState, view: Route) => {
const index = state.cachedViews.indexOf(view.meta.name);
index > -1 && state.cachedViews.splice(index, 1);
},
DEL_OTHERS_VISITED_VIEWS: (state: TagsState, view: Route) => {
state.visitedViews = state.visitedViews.filter((v: any) => {
return v.meta.affix || v.path === view.path;
});
},
DEL_OTHERS_CACHED_VIEWS: (state: TagsState, view: Route) => {
const index = state.cachedViews.indexOf(view.meta.name);
if (index > -1) {
state.cachedViews = state.cachedViews.slice(index, index + 1);
} else {
// if index = -1, there is no cached tags
state.cachedViews = [];
}
},
DEL_ALL_VISITED_VIEWS: (state: TagsState) => {
// keep affix tags
const affixTags = state.visitedViews.filter((tag: any) => tag.meta.affix);
state.visitedViews = affixTags;
},
DEL_ALL_CACHED_VIEWS: (state: TagsState) => {
state.cachedViews = [];
},
UPDATE_VISITED_VIEW: (state: TagsState, view: Route) => {
for (let v of state.visitedViews) {
if (v.path === view.path) {
v = Object.assign(v, view);
break;
}
}
},
};
const actions = {
addView({ dispatch }: any, view: Route) {
dispatch("addVisitedView", view);
dispatch("addCachedView", view);
},
addVisitedView({ commit }: any, view: Route) {
commit("ADD_VISITED_VIEW", view);
},
addCachedView({ commit }: any, view: Route) {
commit("ADD_CACHED_VIEW", view);
},
delView({ dispatch, state }: any, view: Route) {
return new Promise((resolve) => {
dispatch("delVisitedView", view);
dispatch("delCachedView", view);
resolve({
visitedViews: [...state.visitedViews],
cachedViews: [...state.cachedViews],
});
});
},
delVisitedView({ commit, state }: any, view: Route) {
return new Promise((resolve) => {
commit("DEL_VISITED_VIEW", view);
resolve([...state.visitedViews]);
});
},
delCachedView({ commit, state }: any, view: Route) {
return new Promise((resolve) => {
commit("DEL_CACHED_VIEW", view);
resolve([...state.cachedViews]);
});
},
delOthersViews({ dispatch, state }: any, view: Route) {
return new Promise((resolve) => {
dispatch("delOthersVisitedViews", view);
dispatch("delOthersCachedViews", view);
resolve({
visitedViews: [...state.visitedViews],
cachedViews: [...state.cachedViews],
});
});
},
delOthersVisitedViews({ commit, state }: any, view: Route) {
return new Promise((resolve) => {
commit("DEL_OTHERS_VISITED_VIEWS", view);
resolve([...state.visitedViews]);
});
},
delOthersCachedViews({ commit, state }: any, view: Route) {
return new Promise((resolve) => {
commit("DEL_OTHERS_CACHED_VIEWS", view);
resolve([...state.cachedViews]);
});
},
delAllViews({ dispatch, state }: any, view: Route) {
return new Promise((resolve) => {
dispatch("delAllVisitedViews", view);
dispatch("delAllCachedViews", view);
resolve({
visitedViews: [...state.visitedViews],
cachedViews: [...state.cachedViews],
});
});
},
delAllVisitedViews({ commit, state }: any) {
return new Promise((resolve) => {
commit("DEL_ALL_VISITED_VIEWS");
resolve([...state.visitedViews]);
});
},
delAllCachedViews({ commit, state }: any) {
return new Promise((resolve) => {
commit("DEL_ALL_CACHED_VIEWS");
resolve([...state.cachedViews]);
});
},
updateVisitedView({ commit }: any, view: Route) {
commit("UPDATE_VISITED_VIEW", view);
},
};
export default {
namespaced: true,
state,
mutations,
actions,
};
上面代碼，我們定義了一系列的對標簽的操作。
組件實現
組件解構如圖
TheTagsView.vue
<script lang="ts">
/**
* @author leo
* @description #15638 【test_tabs 組件】tab組件
*/
import { Component, Vue, Prop, Watch, Mixins } from "vue-property-decorator";
import ScrollPane from "./ScrollPane.vue";
import path from "path";
@Component({
components: {
ScrollPane,
},
})
export default class TheTagsView extends Vue {
get visitedViews() {
return this.$store.state.tagsView.visitedViews; // 點開過的視圖
}
get routes() {
return this.$store.state.permission.routes;
}
public visible: boolean = false; // 標簽右鍵列表顯示隱藏
public top: number = 0; // transform定位
public left: number = 0; // transform定位
public selectedTag: any = {}; // 當前活躍的標簽
public affixTags: any[] = []; // 所有標簽
@Watch("$route")
public watchRoute() {
this.addTags(); // 新增當前標簽
this.moveToCurrentTag(); // 刪除原活動標簽
}
@Watch("visible")
public watchVisible(value: any) {
if (value) {
document.body.addEventListener("click", this.closeMenu);
} else {
document.body.removeEventListener("click", this.closeMenu);
}
}
public isActive(route: any) { // 是否當前活動
return route.path === this.$route.path;
}
public isAffix(tag: any) { // 是否固定
return tag.meta && tag.meta.affix;
}
// 過濾當前標簽于路由
public filterAffixTags(routes: any, basePath = "/") {
let tags: any = [];
routes.forEach((route: any) => {
if (route.meta && route.meta.affix) {
const tagPath = path.resolve(basePath, route.path);
tags.push({
fullPath: tagPath,
path: tagPath,
name: route.name,
meta: { ...route.meta },
});
}
if (route.children) {
const tempTags = this.filterAffixTags(route.children, route.path);
if (tempTags.length >= 1) {
tags = [...tags, ...tempTags];
}
}
});
return tags;
}
public addTags() {
const { name } = this.$route;
if (name) {
this.$store.dispatch("tagsView/addView", this.$route);
}
return false;
}
public moveToCurrentTag() {
const tags: any = this.$refs.tag;
this.$nextTick(() => {
if (tags) {
for (const tag of tags) {
if (tag.to.path === this.$route.path) {
(this.$refs.scrollPane as any).moveToTarget(tag);
// when query is different then update
if (tag.to.fullPath !== this.$route.fullPath) {
this.$store.dispatch("tagsView/updateVisitedView", this.$route);
}
break;
}
}
}
});
}
public refreshSelectedTag(view: any) {
this.$store.dispatch("tagsView/delCachedView", view).then(() => {
const { fullPath } = view;
this.$nextTick(() => {
this.$router.replace({
path: "/redirect" + fullPath,
});
});
});
}
public closeSelectedTag(view: any) {
this.$store.dispatch("tagsView/delView", view).then(({ visitedViews }) => {
if (this.isActive(view)) {
this.toLastView(visitedViews, view);
}
});
}
public closeOthersTags() {
this.$router.push(this.selectedTag);
this.$store.dispatch("tagsView/delOthersViews", this.selectedTag).then(() => {
this.moveToCurrentTag();
});
}
public closeAllTags(view: any) {
this.$store.dispatch("tagsView/delAllViews").then(({ visitedViews }) => {
if (this.affixTags.some((tag) => tag.path === view.path)) {
return;
}
this.toLastView(visitedViews, view);
});
}
public toLastView(visitedViews: any , view: any) {
const latestView = visitedViews.slice(-1)[0];
if (latestView) {
this.$router.push(latestView.fullPath);
} else {
// now the default is to redirect to the home page if there is no tags-view,
// you can adjust it according to your needs.
if (view.name === "Dashboard") {
// to reload home page
this.$router.replace({ path: "/redirect" + view.fullPath });
} else {
this.$router.push("/");
}
}
}
public openMenu(tag: any , e: any) {
const menuMinWidth = 105;
const offsetLeft = this.$el.getBoundingClientRect().left; // container margin left
const offsetWidth = this.$el.offsetWidth; // container width
const maxLeft = offsetWidth - menuMinWidth; // left boundary
const left = e.clientX - offsetLeft + 15 + 160; // 15: margin right
if (left > maxLeft) {
this.left = maxLeft;
} else {
this.left = left;
}
this.top = e.clientY;
this.visible = true;
this.selectedTag = tag;
}
public closeMenu() {
this.visible = false;
}
public mounted() {
this.initTags();
this.addTags(); // 添加當前頁面tag
}
}
</script>
<template>
<div id="tags-view-container" class="tags-view-container">
<scroll-pane ref="scrollPane" class="tags-view-wrapper">
<router-link
v-for="(tag, index) in visitedViews"
ref="tag"
:key="tag.path"
:class="isActive(tag)?"active":"""
:to="{ path: tag.path, query: tag.query, fullPath: tag.fullPath }"
tag="span"
class="tags-view-item"
@click.middle.native="!isAffix(tag)?closeSelectedTag(tag):"""
@contextmenu.prevent.native="openMenu(tag,$event)"
>
{{ tag.title }}
<!-- <span v-if="!isAffix(tag)" class="el-icon-close" @click.prevent.stop="closeSelectedTag(tag)" /> -->
<span class="tab-border" v-if="index!==visitedViews.length-1"></span>
</router-link>
</scroll-pane>
<ul v-show="visible" :style="{left:left+"px",top:top+"px"}" class="contextmenu">
<li @click="refreshSelectedTag(selectedTag)">刷新</li>
<li v-if="!isAffix(selectedTag)" @click="closeSelectedTag(selectedTag)">關閉當前標簽</li>
<li @click="closeOthersTags">關閉其他標簽</li>
<li @click="closeAllTags(selectedTag)">關閉所有</li>
</ul>
</div>
</template>
<style lang="less" scoped>
.tags-view-container {
height: 46px;
width: 100%;
background: #fff;
.tags-view-wrapper {
position: relative;
.tags-view-item {
display: inline-block;
position: relative;
cursor: pointer;
height: 46px;
line-height: 46px;
// border: 1px solid #d8dce5;
color: #495060;
background: #fff;
padding: 0 4px;
font-size: 14px;
.tab-border {
display: inline-block;
height: 10px;
width: 1px;
background: #f1f1f1;
margin-left: 4px;
}
&:hover {
border-bottom: 2px solid #666;
}
&.active {
// background-color: #1F1A16;
border-bottom: 2px solid #1F1A16;
color: #333;
// border-color: #1F1A16;
// &::before {
// content: "";
// background: #fff;
// display: inline-block;
// width: 8px;
// height: 8px;
// border-radius: 50%;
// position: relative;
// margin-right: 2px;
// }
}
}
}
.contextmenu {
margin: 0;
background: #fff;
z-index: 3000;
position: absolute;
list-style-type: none;
padding: 5px 0;
border-radius: 4px;
font-size: 12px;
font-weight: 400;
color: #333;
box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, .3);
li {
margin: 0;
padding: 7px 16px;
cursor: pointer;
&:hover {
background: #eee;
}
}
}
}
</style>
<style lang="less">
//reset element css of el-icon-close
.tags-view-wrapper {
.tags-view-item {
.el-icon-close {
width: 16px;
height: 16px;
vertical-align: 3px;
border-radius: 50%;
text-align: center;
transition: all .3s cubic-bezier(.645, .045, .355, 1);
transform-origin: 100% 50%;
&:before {
transform: scale(.6);
display: inline-block;
vertical-align: -3px;
}
&:hover {
background-color: #b4bccc;
color: #fff;
}
}
}
.el-scrollbar__bar{
pointer-events: none;
opacity: 0;
}
}
</style>
ScrollPane.vue
<script lang="ts">
/**
* @author leo
* @description #15638 【test_tabs 組件】tab組件
*/
import { Component, Vue, Prop, Watch, Mixins } from "vue-property-decorator";
const tagAndTagSpacing = 4; // tagAndTagSpacing
@Component({
components: {
ScrollPane,
},
})
export default class ScrollPane extends Vue {
get scrollWrapper() {
return (this.$refs.scrollContainer as any).$refs.wrap;
}
public left: number = 0;
public handleScroll(e: any) {
const eventDelta = e.wheelDelta || -e.deltaY * 40;
const $scrollWrapper = this.scrollWrapper;
$scrollWrapper.scrollLeft = $scrollWrapper.scrollLeft + eventDelta / 4;
}
public moveToTarget(currentTag: any) {
const $container = (this.$refs.scrollContainer as any).$el;
const $containerWidth = $container.offsetWidth;
const $scrollWrapper = this.scrollWrapper;
const tagList: any = this.$parent.$refs.tag;
let firstTag = null;
let lastTag = null;
// find first tag and last tag
if (tagList.length > 0) {
firstTag = tagList[0];
lastTag = tagList[tagList.length - 1];
}
if (firstTag === currentTag) {
$scrollWrapper.scrollLeft = 0;
} else if (lastTag === currentTag) {
$scrollWrapper.scrollLeft = $scrollWrapper.scrollWidth - $containerWidth;
} else {
// find preTag and nextTag
const currentIndex = tagList.findIndex((item: any) => item === currentTag);
const prevTag = tagList[currentIndex - 1];
const nextTag = tagList[currentIndex + 1];
// the tag"s offsetLeft after of nextTag
const afterNextTagOffsetLeft = nextTag.$el.offsetLeft + nextTag.$el.offsetWidth + tagAndTagSpacing;
// the tag"s offsetLeft before of prevTag
const beforePrevTagOffsetLeft = prevTag.$el.offsetLeft - tagAndTagSpacing;
if (afterNextTagOffsetLeft > $scrollWrapper.scrollLeft + $containerWidth) {
$scrollWrapper.scrollLeft = afterNextTagOffsetLeft - $containerWidth;
} else if (beforePrevTagOffsetLeft < $scrollWrapper.scrollLeft) {
$scrollWrapper.scrollLeft = beforePrevTagOffsetLeft;
}
}
}
}
</script>
<template>
<el-scrollbar ref="scrollContainer" :vertical="false" class="scroll-container" @wheel.native.prevent="handleScroll">
<slot />
</el-scrollbar>
</template>
<style lang="less" scoped>
.scroll-container {
white-space: nowrap;
position: relative;
overflow: hidden;
width: 100%;
.el-scrollbar__bar {
bottom: 0px;
}
.el-scrollbar__wrap {
height: 49px;
}
}
</style>
index.ts
import TheTagsView from "./TheTagsView.vue"; export default TheTagsView;
這樣我們的組件就寫完啦，有哪里有問題的小伙伴可以留言哦。
組件調用
因為是全局的，所以放在全局下直接調用就好了
總結
這樣我們一個簡單的能實現alive 頁面的tag功能就實現了。大家趕緊嘗試一下吧~
兄臺，請留步。這里有幾點要注意一下哦~
問題1： 開發環境緩存住了，線上環境不好用了
我們是根據組件name值是否是include里包含的來判斷的。但是你會發現生產的的時候 class后面的名在線上被打包后變了。 什么？！這豈不是緩存不住了？？？是的。 所以解決辦法如圖。一般人我不告訴他0.o
問題2： tags的顯示名字我在哪定義呢
tags顯示的名字我怎么定義呢，好問題。小兄弟肯定沒有仔細讀代碼
ADD_VISITED_VIEW: (state: TagsState, view: Route) => {
if (state.visitedViews.some((v: any) => v.path === view.path)) { return; }
state.visitedViews.push(
Object.assign({}, view, {
title: view.meta.title || "no-name", /// 我在這里！！！！！
}),
);
},
由上圖我們可知，我是在路由的配置里mate標簽里的tile里配置的。至于你，隨你哦~
{
path: "index", // 入口
name: "common-home-index-index",
component: () => import(/* webpackChunkName: "auth" */ "@/views/home/index.vue"),
meta: {
title: "首頁", // 看見了么，我就是你要顯示的名字
name: "CommonHome", // 記住，我要跟你的上面name頁面組件名字一樣
},
}
問題3：我有的頁面，跳路由后想刷新了怎么辦
那我們頁面緩存住了，我怎么讓頁面刷新呢，比如我新增頁面，新增完了需要關閉當前頁面跳回列表頁面的，我們的思路就是，關閉標簽，url參數添加refresh參數
this.$store
.dispatch("tagsView/delView", this.$route)
.then(({ visitedViews }) => {
EventBus.$emit("gotoOwnerDeliveryOrderIndex", {
refresh: true,
});
});
然后在activated鉤子里判斷下是否有這個參數，
this.$route.query.refresh && this.fetchData();
記得處理完結果后吧refresh刪了，不然每次進來都刷新了，我們是在拉去數據的混合里刪的
if ( this.$route.query.refresh ) {
this.$route.query.refresh = "";
}
問題4：有沒有彩蛋啊
有的，請看圖。 
我的哥乖乖，怎么實現的呢。這個留給你們研究吧。上面代碼已經實現了。只不過你需要在加一個頁面，跟路由。其實就是跳轉到一個新空頁面路由。重新跳回來一下~
redirect/index.vue
<script lang="ts">
import { Component, Vue, Prop, Watch, Mixins } from "vue-property-decorator";
@Component
export default class Redirect extends Vue {
public created() {
const { params, query } = this.$route;
const { path } = params;
// debugger;
this.$router.replace({ path: "/" + path, query });
}
}
</script>
<template>
</template>
/**
* 刷新跳轉路由
*/
export const redirectRouter: any = {
path: "/redirect",
name: "redirect",
component: RouterView,
children: [
{
path: "/redirect/:path*",
component: () => import(/* webpackChunkName: "redirect" */ "@/views/redirect/index.vue"),
meta: {
title: "title",
},
},
],
};
參考
https://github.com/PanJiaChen/vue-element-admin
到此這篇關于實用的 vue tags 創建緩存導航的過程的文章就介紹到這了,更多相關實用的 vue tags 創建緩存導航的過程內容請搜索服務器之家以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持服務器之家！
原文鏈接：https://juejin.cn/post/6901576100531404813
