实现Vue的多页签组件

在之前的博客中  关于vue的多页面标签功能,对于嵌套router-view缓存的最终无奈解决方法  有写过vue的多页签功能的解决方案

可以看到我当时那个多页签的组件还是比较简单 的,只有打开跟关闭功能,后面有不少网友找我,能不能实现刷新当前页,关闭其它页面,关闭左边页面,关闭右边页面的功能。

 

这几天项目上线后有点时间,把这个多页签组件给完善一下。

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/

演示:http://dev.caijt.com

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
      }
    }
}

 

posted on 2021-01-13 16:29  菜工  阅读(2642)  评论(3编辑  收藏  举报

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