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vue.js实现全选

2026-01-20 10:11:31VUE

Vue.js 实现全选功能

在 Vue.js 中实现全选功能通常需要结合 v-model 和计算属性来处理复选框的状态。以下是实现全选的几种方法：

方法一：基础实现（使用数组存储选中项）

<template>
  <div>
    <input type="checkbox" v-model="selectAll" @change="toggleAll"> 全选
    <div v-for="item in items" :key="item.id">
      <input type="checkbox" v-model="selectedItems" :value="item.id">
      {{ item.name }}
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: [
        { id: 1, name: '选项1' },
        { id: 2, name: '选项2' },
        { id: 3, name: '选项3' }
      ],
      selectedItems: []
    }
  },
  computed: {
    selectAll: {
      get() {
        return this.selectedItems.length === this.items.length
      },
      set(value) {
        this.selectedItems = value ? this.items.map(item => item.id) : []
      }
    }
  },
  methods: {
    toggleAll() {
      this.selectAll = !this.selectAll
    }
  }
}
</script>

方法二：对象形式存储选中状态

<template>
  <div>
    <input type="checkbox" v-model="allSelected" @change="selectAll"> 全选
    <div v-for="item in items" :key="item.id">
      <input type="checkbox" v-model="selected[item.id]">
      {{ item.name }}
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: [
        { id: 1, name: '选项1' },
        { id: 2, name: '选项2' },
        { id: 3, name: '选项3' }
      ],
      selected: {}
    }
  },
  computed: {
    allSelected: {
      get() {
        return Object.values(this.selected).every(Boolean)
      },
      set(value) {
        this.items.forEach(item => {
          this.$set(this.selected, item.id, value)
        })
      }
    }
  },
  methods: {
    selectAll() {
      this.allSelected = !this.allSelected
    }
  }
}
</script>

方法三：使用 Vuex 管理状态（适用于大型应用）

// store.js
const store = new Vuex.Store({
  state: {
    items: [
      { id: 1, name: '选项1' },
      { id: 2, name: '选项2' },
      { id: 3, name: '选项3' }
    ],
    selectedItems: []
  },
  mutations: {
    TOGGLE_ALL(state, payload) {
      state.selectedItems = payload 
        ? state.items.map(item => item.id)
        : []
    },
    TOGGLE_ITEM(state, id) {
      const index = state.selectedItems.indexOf(id)
      if (index === -1) {
        state.selectedItems.push(id)
      } else {
        state.selectedItems.splice(index, 1)
      }
    }
  },
  getters: {
    isAllSelected(state) {
      return state.selectedItems.length === state.items.length
    }
  }
})

<template>
  <div>
    <input 
      type="checkbox" 
      :checked="isAllSelected" 
      @change="$store.commit('TOGGLE_ALL', !isAllSelected)"
    > 全选
    <div v-for="item in items" :key="item.id">
      <input 
        type="checkbox" 
        :checked="selectedItems.includes(item.id)"
        @change="$store.commit('TOGGLE_ITEM', item.id)"
      >
      {{ item.name }}
    </div>
  </div>
</template>

<script>
import { mapState, mapGetters } from 'vuex'

export default {
  computed: {
    ...mapState(['items', 'selectedItems']),
    ...mapGetters(['isAllSelected'])
  }
}
</script>