关于element-ui:vueelement-实现tagsView功能

vue+element 实现 tagsView 性能

胜利后示例

1. vuex store 去存储浏览过的菜单；
   目录构造
   

// 新建 tagsView.js
const tagsView = {
    state: {visitedViews: [],
      cachedViews: []},
    mutations: {ADD_VISITED_VIEWS: (state, view) => {if (state.visitedViews.some(v => v.path === view.path)) return
        state.visitedViews.push(Object.assign({}, view, {title: view.meta.title || 'no-name'}))
        if (!view.meta.noCache) {state.cachedViews.push(view.name)
        }
      },
      DEL_VISITED_VIEWS: (state, view) => {for (const [i, v] of state.visitedViews.entries()) {if (v.path === view.path) {state.visitedViews.splice(i, 1)
            break
          }
        }
        for (const i of state.cachedViews) {if (i === view.name) {const index = state.cachedViews.indexOf(i)
            state.cachedViews.splice(index, 1)
            break
          }
        }
      },
      DEL_OTHERS_VIEWS: (state, view) => {for (const [i, v] of state.visitedViews.entries()) {if (v.path === view.path) {state.visitedViews = state.visitedViews.slice(i, i + 1)
            break
          }
        }
        for (const i of state.cachedViews) {if (i === view.name) {const index = state.cachedViews.indexOf(i)
            state.cachedViews = state.cachedViews.slice(index, i + 1)
            break
          }
        }
      },
      DEL_ALL_VIEWS: (state) => {state.visitedViews = []
        state.cachedViews = []}
    },
    actions: {addVisitedViews({ commit}, view) {commit('ADD_VISITED_VIEWS', view)
      },
      delVisitedViews({commit, state}, view) {return new Promise((resolve) => {commit('DEL_VISITED_VIEWS', view)
          resolve([...state.visitedViews])
        })
      },
      delOthersViews({commit, state}, view) {return new Promise((resolve) => {commit('DEL_OTHERS_VIEWS', view)
          resolve([...state.visitedViews])
        })
      },
      delAllViews({commit, state}) {return new Promise((resolve) => {commit('DEL_ALL_VIEWS')
          resolve([...state.visitedViews])
        })
      }
    }
  }
   
  export default tagsView

2. 文件夹 store 中 index.js 引入方才新建的 tagsView.js，并放入 modules 模块中去

import tagsView from './modules/tagsView'
// 后面 state，mutations，getters，actions... 省略
 modules: {tagsView}

3. 新建 tagsView 文件夹（index.vue,scrollPane.vue）目录构造本人定，我是放在了 components 里的 common 文件夹；
   

//index.vue
<template>
     <div class="tags-view-container">
          <scroll-pane class="tags-view-wrapper" ref="scrollPane">
              <router-link ref="tag"  :class="isActive(tag)?'active':''" class="tags-view-item"  :to="tag"  @contextmenu.prevent.native="openMenu(tag,$event)" v-for="tag in Array.from(visitedViews)" :key="tag.path" >
                {{tag.title}}
                  <span class="el-icon-close" @click.prevent.stop='closeSelectedTag(tag)'></span>
              </router-link>
          </scroll-pane>
       <ul class='contextmenu' v-show="visible" :style="{left:left+'px',top:top+'px'}">
         <li @click="closeSelectedTag(selectedTag)"> 敞开 </li>
         <li @click="closeOthersTags"> 敞开其余 </li>
         <li @click="closeAllTags"> 敞开所有 </li>
       </ul>
     </div>
</template>
 
<script>
// 留神文件门路
  import ScrollPane from '@/components/common/TagsView/ScrollPane'
  
    export default {
      name: "tags-view",
      components: {ScrollPane},
     data(){
          return{
            visible: false,
            top: 0,
            left: 0,
            selectedTag: {}}
     },
      computed:{visitedViews(){console.log('tabView')
            console.log(this.$store.state.tagsView)
            // console.log(this.$store.state)
            return this.$store.state.tagsView.visitedViews
          }
      },
      watch:{$route(){this.addViewTags()
           this.moveToCurrentTag()},
        visible(value) {if (value) {document.body.addEventListener('click', this.closeMenu)
          } else {document.body.removeEventListener('click', this.closeMenu)
          }
        }
      },
      mounted() {this.addViewTags()
      },
      methods:{generateRoute(){// console.log(this.$route.name)
            if (this.$route.path) {return this.$route}
            return false
          },
        isActive(route) {return route.path === this.$route.path},
        addViewTags() {const route = this.generateRoute()
          // console.log(route)
          if (!route) {return false}
          this.$store.dispatch('addVisitedViews', route)
        },
        moveToCurrentTag() {
          const tags = this.$refs.tag
          this.$nextTick(() => {for (const tag of tags) {if (tag.to.path === this.$route.path) {this.$refs.scrollPane.moveToTarget(tag.$el)
                break
              }
            }
          })
        },
        closeSelectedTag(view) {this.$store.dispatch('delVisitedViews', view).then((views) => {if (this.isActive(view)) {const latestView = views.slice(-1)[0]
              if (latestView) {this.$router.push(latestView)
              } else {this.$router.push('/')
              }
            }
          })
        },
        closeOthersTags() {this.$router.push(this.selectedTag)
          this.$store.dispatch('delOthersViews', this.selectedTag).then(() => {this.moveToCurrentTag()
          })
        },
        closeAllTags() {this.$store.dispatch('delAllViews')
          this.$router.push('/')
        },
        openMenu(tag, e) {
          this.visible = true
          this.selectedTag = tag
          const offsetLeft = this.$el.getBoundingClientRect().left // container margin left
          this.left = e.clientX - offsetLeft + 15 // 15: margin right
          this.top = e.clientY
        },
        closeMenu() {this.visible = false}
      }
    }
</script>
 
<style scoped>
    .tags-view-wrapper {
      background: #fff;
      height: 54px;
      border-bottom: 1px solid #d8dce5;
      box-shadow: 0 1px 3px 0 rgba(0, 0, 0, .12), 0 0 3px 0 rgba(0, 0, 0, .04);
    }
    .tags-view-item {
        display: inline-block;
        position: relative;
        height: 30px;
        line-height: 30px;
        border: 1px solid #d8dce5;
        color: #495060;
        background: #fff;
        padding: 0 8px;
        font-size: 12px;
        margin-left: 5px;
        margin-top: 4px;
    }
    .tags-view-item:first-of-type {margin-left: 15px;}
    .tags-view-item.active{
      background-color: #42b983;
      color: #fff;
      border-color: #42b983;
    }
    .tags-view-item.active::before{
       content: '';
      background: #fff;
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      position: relative;
      top: -1px;
      margin-right: 2px;
    }
    .contextmenu {
      margin: 0;
      background: #fff;
      z-index: 100;
      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);
    }
  .contextmenu li{
      margin: 0;
      padding: 7px 16px;
      cursor: pointer;
  }
  .contextmenu li:hover{background: #eee;}
  .tags-view-item .el-icon-close{
    width: 16px;
    height: 16px;
    border-radius: 50%;
    text-align: center;
    transition: all .3s cubic-bezier(.645, .045, .355, 1);
    transform-origin: 100% 50%;
  }
  .el-icon-close:before{transform: scale(.6);
    display: inline-block;
  }
</style>
 

//ScrollPane.vue
<template>
  <div class="scroll-container" ref="scrollContainer" @wheel.prevent="handleScroll">
    <div class="scroll-wrapper" ref="scrollWrapper" :style="{left: left +'px'}">
      <slot></slot>
    </div>
  </div>
</template>
 
<script>
  const padding = 15 // tag's padding
 
  export default {
    name: 'scrollPane',
    data() {
      return {left: 10}
    },
    methods: {handleScroll(e) {
        const eventDelta = e.wheelDelta || -e.deltaY * 3//wheelDelta:-120;deltaY:-120
        const $container = this.$refs.scrollContainer// 里面的 container
        const $containerWidth = $container.offsetWidth// 里面的 container 的宽度
        const $wrapper = this.$refs.scrollWrapper// 外面
        const $wrapperWidth = $wrapper.offsetWidth// 外面的宽度
 
        if (eventDelta > 0) {this.left = Math.min(0, this.left + eventDelta)//min() 办法可返回指定的数字中带有最低值的数字。} else {if ($containerWidth - padding < $wrapperWidth) {if (this.left < -($wrapperWidth - $containerWidth + padding)) {this.left = this.left} else {this.left = Math.max(this.left + eventDelta, $containerWidth - $wrapperWidth - padding)
            }
          } else {this.left = 0}
        }
      },
      moveToTarget($target) {
        const $container = this.$refs.scrollContainer
        const $containerWidth = $container.offsetWidth
        const $targetLeft = $target.offsetLeft
        const $targetWidth = $target.offsetWidth
 
        if ($targetLeft < -this.left) {
          // tag in the left
          this.left = -$targetLeft + padding
        } else if ($targetLeft + padding > -this.left && $targetLeft + $targetWidth < -this.left + $containerWidth - padding) {
          // tag in the current view
          // eslint-disable-line
        } else {
          // tag in the right
          this.left = -($targetLeft - ($containerWidth - $targetWidth) + padding)
        }
      }
    }
  }
</script>
 
<style scoped>
  .scroll-container {
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    width: 100%;
  }
  .scroll-wrapper {
    position: absolute;
    top: 8px;
  }
</style>

注意事项：

1. 留神文件引入的门路;
2. router.js 路由要加上 meta,name。