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    Vue实现多页签组件

    作者:shunshunshun18 栏目:未分类 时间:2021-01-14 14:45:19

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    直接看效果,增加了右键菜单,分别有重新加载、关闭左边、关闭右边、关闭其他功能。

    也可以到我的github上看看代码(如果觉得这个组件有用的话,别忘了顺手给个小星星)

    代码:https://github.com/Caijt/VuePageTab

    演示:https://caijt.github.io/VuePageTab/

    我这个多页签组件里面的删除缓存的方法不是使用keep-alive组件自带的include、exculde结合的效果,而是使用暴力删除缓存的方法,这个在上个博客中也有提到,用这种方法的话,可以实现更完整的多页签功能,例如同个路由可以根据参数的不同同时打开不同的页签,也能不用去写那些路由的name值。

    先直接看组件代码(里面用了一些element-ui的组件,如果你们不用element-ui的话。可以去掉,自己实现)

    <template>
     <div class="__common-layout-pageTabs">
      <el-scrollbar>
       <div class="__tabs">
        <div
         class="__tab-item"
         v-for="item in openedPageRouters"
         :class="{
          '__is-active': item.fullPath == $route.fullPath,
         }"
         :key="item.fullPath"
         @click="onClick(item)"
         @contextmenu.prevent="showContextMenu($event, item)"
        >
         {{ item.meta.title }}
         <span
          class="el-icon-close"
          @click.stop="onClose(item)"
          @contextmenu.prevent.stop=""
          :style="openedPageRouters.length <= 1 ? 'width:0;' : ''"
         ></span>
        </div>
       </div>
      </el-scrollbar>
      <div v-show="contextMenuVisible">
       <ul
        :style="{ left: contextMenuLeft + 'px', top: contextMenuTop + 'px' }"
        class="__contextmenu"
       >
        <li>
         <el-button type="text" @click="reload()" size="mini">
          重新加载
         </el-button>
        </li>
        <li>
         <el-button
          type="text"
          @click="closeOtherLeft"
          :disabled="false"
          size="mini"
          >关闭左边</el-button
         >
        </li>
        <li>
         <el-button
          type="text"
          @click="closeOtherRight"
          :disabled="false"
          size="mini"
          >关闭右边</el-button
         >
        </li>
        <li>
         <el-button type="text" @click="closeOther" size="mini"
          >关闭其他</el-button
         >
        </li>
       </ul>
      </div>
     </div>
    </template>
    <script>
    export default {
     props: {
      keepAliveComponentInstance: {}, //keep-alive控件实例对象
      blankRouteName: {
       type: String,
       default: "blank",
      }, //空白路由的name值
     },
     data() {
      return {
       contextMenuVisible: false, //右键菜单是否显示
       contextMenuLeft: 0, //右键菜单显示位置
       contextMenuTop: 0, //右键菜单显示位置
       contextMenuTargetPageRoute: null, //右键所指向的菜单路由
       openedPageRouters: [], //已打开的路由页面
      };
     },
     watch: {
      //当路由变更时,执行打开页面的方法
      $route: {
       handler(v) {
        this.openPage(v);
       },
       immediate: true,
      },
     },
     mounted() {
      //添加点击关闭右键菜单
      window.addEventListener("click", this.closeContextMenu);
     },
     destroyed() {
      window.removeEventListener("click", this.closeContextMenu);
     },
     methods: {
      //打开页面
      openPage(route) {
       if (route.name == this.blankRouteName) {
        return;
       }
       let isExist = this.openedPageRouters.some(
        (item) => item.fullPath == route.fullPath
       );
       if (!isExist) {
        let openedPageRoute = this.openedPageRouters.find(
         (item) => item.path == route.path
        );
        //判断页面是否支持不同参数多开页面功能,如果不支持且已存在path值一样的页面路由,那就替换它
        if (!route.meta.canMultipleOpen && openedPageRoute != null) {
         this.delRouteCache(openedPageRoute.fullPath);
         this.openedPageRouters.splice(
          this.openedPageRouters.indexOf(openedPageRoute),
          1,
          route
         );
        } else {
         this.openedPageRouters.push(route);
        }
       }
      },
      //点击页面标签卡时
      onClick(route) {
       if (route.fullPath !== this.$route.fullPath) {
        this.$router.push(route.fullPath);
       }
      },
      //关闭页面标签时
      onClose(route) {
       let index = this.openedPageRouters.indexOf(route);
       this.delPageRoute(route);
       if (route.fullPath === this.$route.fullPath) {
        //删除页面后,跳转到上一页面
        this.$router.replace(
         this.openedPageRouters[index == 0 ? 0 : index - 1]
        );
       }
      },
      //右键显示菜单
      showContextMenu(e, route) {
       this.contextMenuTargetPageRoute = route;
       this.contextMenuLeft = e.layerX;
       this.contextMenuTop = e.layerY;
       this.contextMenuVisible = true;
      },
      //隐藏右键菜单
      closeContextMenu() {
       this.contextMenuVisible = false;
       this.contextMenuTargetPageRoute = null;
      },
      //重载页面
      reload() {
       this.delRouteCache(this.contextMenuTargetPageRoute.fullPath);
       if (this.contextMenuTargetPageRoute.fullPath === this.$route.fullPath) {
        this.$router.replace({ name: this.blankRouteName }).then(() => {
         this.$router.replace(this.contextMenuTargetPageRoute);
        });
       }
      },
      //关闭其他页面
      closeOther() {
       for (let i = 0; i < this.openedPageRouters.length; i++) {
        let r = this.openedPageRouters[i];
        if (r !== this.contextMenuTargetPageRoute) {
         this.delPageRoute(r);
         i--;
        }
       }
       if (this.contextMenuTargetPageRoute.fullPath != this.$route.fullPath) {
        this.$router.replace(this.contextMenuTargetPageRoute);
       }
      },
      //根据路径获取索引
      getPageRouteIndex(fullPath) {
       for (let i = 0; i < this.openedPageRouters.length; i++) {
        if (this.openedPageRouters[i].fullPath === fullPath) {
         return i;
        }
       }
      },
      //关闭左边页面
      closeOtherLeft() {
       let index = this.openedPageRouters.indexOf(
        this.contextMenuTargetPageRoute
       );
       let currentIndex = this.getPageRouteIndex(this.$route.fullPath);
       if (index > currentIndex) {
        this.$router.replace(this.contextMenuTargetPageRoute);
       }
       for (let i = 0; i < index; i++) {
        let r = this.openedPageRouters[i];
        this.delPageRoute(r);
        i--;
        index--;
       }
      },
      //关闭右边页面
      closeOtherRight() {
       let index = this.openedPageRouters.indexOf(
        this.contextMenuTargetPageRoute
       );
       let currentIndex = this.getPageRouteIndex(this.$route.fullPath);
       for (let i = index + 1; i < this.openedPageRouters.length; i++) {
        let r = this.openedPageRouters[i];
        this.delPageRoute(r);
        i--;
       }
       if (index < currentIndex) {
        this.$router.replace(this.contextMenuTargetPageRoute);
       }
      },
      //删除页面
      delPageRoute(route) {
       let routeIndex = this.openedPageRouters.indexOf(route);
       if (routeIndex >= 0) {
        this.openedPageRouters.splice(routeIndex, 1);
       }
       this.delRouteCache(route.fullPath);
      },
      //删除页面缓存
      delRouteCache(key) {
       let cache = this.keepAliveComponentInstance.cache;
       let keys = this.keepAliveComponentInstance.keys;
       for (let i = 0; i < keys.length; i++) {
        if (keys[i] == key) {
         keys.splice(i, 1);
         if (cache[key] != null) {
          delete cache[key];
         }
         break;
        }
       }
      },
     },
    };
    </script>
    <style lang="scss">
    .__common-layout-pageTabs {
     .__contextmenu {
      // width: 100px;
      margin: 0;
      border: 1px solid #e4e7ed;
      background: #fff;
      z-index: 3000;
      position: absolute;
      list-style-type: none;
      padding: 5px 0;
      border-radius: 4px;
      font-size: 14px;
      color: #333;
      box-shadow: 1px 1px 3px 0 rgba(0, 0, 0, 0.1);
      li {
       margin: 0;
       padding: 0px 15px;
       &:hover {
        background: #f2f2f2;
        cursor: pointer;
       }
       button {
        color: #2c3e50;
       }
      }
     }
    
     $c-tab-border-color: #dcdfe6;
     position: relative;
     &::before {
      content: "";
      border-bottom: 1px solid $c-tab-border-color;
      position: absolute;
      left: 0;
      right: 0;
      bottom: 0;
      height: 100%;
     }
     .__tabs {
      display: flex;
      .__tab-item {
       white-space: nowrap;
       padding: 8px 6px 8px 18px;
       font-size: 12px;
       border: 1px solid $c-tab-border-color;
       border-left: none;
       border-bottom: 0px;
       line-height: 14px;
       cursor: pointer;
       transition: color 0.3s cubic-bezier(0.645, 0.045, 0.355, 1),
        padding 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
       &:first-child {
        border-left: 1px solid $c-tab-border-color;
        border-top-left-radius: 2px;
        margin-left: 10px;
       }
       &:last-child {
        border-top-right-radius: 2px;
        margin-right: 10px;
       }
       &:not(.__is-active):hover {
        color: #409eff;
        .el-icon-close {
         width: 12px;
         margin-right: 0px;
        }
       }
       &.__is-active {
        padding-right: 12px;
        border-bottom: 1px solid #fff;
        color: #409eff;
        .el-icon-close {
         width: 12px;
         margin-right: 0px;
         margin-left: 2px;
        }
       }
       .el-icon-close {
        width: 0px;
        height: 12px;
        overflow: hidden;
        border-radius: 50%;
        font-size: 12px;
        margin-right: 12px;
        transform-origin: 100% 50%;
        transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
        vertical-align: text-top;
        &:hover {
         background-color: #c0c4cc;
         color: #fff;
        }
       }
      }
     }
    }
    </style>

    这个组件它需要两个属性,一个是keepAliveComponentInstance(keep-alive的控件实例对象),blankRouteName(空白路由的名称)

    为什么我需要keep-alive的控件实例对象呢,因为这个对象里面有两个属性,一个是cache,一个是keys,存储着keep-alive的缓存的数据,有了这个对象,我就能在页签关闭时手动删除缓存。那这个对象怎么获取呢,如下所示,在keep-alive所在的父页面上的mounted事件上进行获取(如果keep-alive跟多页签组件不在同一个父页面,那可能就得借用vuex来传值了)

    <template>
     <div id="app">
      <page-tabs :keep-alive-component-instance="keepAliveComponentInstance" />
      <div ref="keepAliveContainer">
       <keep-alive>
        <router-view :key="$route.fullPath" />
       </keep-alive>
      </div>
     </div>
    </template>
    
    <script>
    import pageTabs from "./components/pageTabs.vue";
    export default {
     name: "App",
     components: {
      pageTabs,
     },
     mounted() {
      if (this.$refs.keepAliveContainer) {
       this.keepAliveComponentInstance = this.$refs.keepAliveContainer.childNodes[0].__vue__;//获取keep-alive的控件实例对象
      }
     },
     data() {
      return {
       keepAliveComponentInstance: null,
      };
     }
    };
    </script>

    而空白路由的名称,是干什么,主要我要实现刷新当前页面的功能,我们知道vue是不允许跳转到当前页面,那么我就想我先跳转到别的页面,再跳转回回来的页面,不就也实现刷新的效果了。(当然我用的是relpace,所以不会产生历史记录)

    注:这个空白路由并不是固定定义在根路由上,需根据多页签组件所在位置,假如你有一个根router-view,还有一个布局组件,这个组件里面也有一个子router-view,多页签组件就在这个布局组件里,那么空白路由就需定义在布局组件对应的路由的children里面了

    还有这个组件会根据路由对象的meta对象进行不同的配置,如下所示

    let router = new Router({
     routes: [
      //这个是空白页面,重新加载当前页面会用到
      {
       name: "blank",
       path: "/blank",
      },
      {
       path: "/a",
       component: A,
       meta: {
        title: "A页面", //页面标题
        canMultipleOpen: true //支持根据参数不同多开不同页签,如果你需要/a跟/a?v=123都分别打开两个页签,请设置为true,否则就只会显示一个页签,后打开的会替换到前打开的页签
       }
      }
    }

    以上就是Vue实现多页签组件的详细内容,更多关于Vue实现多页签组件的资料请关注IIS7站长之家博文其它相关文章!