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vue实现按住鼠标多选

2026-02-23 01:51:19VUE

实现思路

在Vue中实现按住鼠标多选功能，核心逻辑是监听鼠标按下、移动和抬起事件，通过状态管理记录选中项。需要结合事件修饰符和动态样式控制。

基础实现步骤

模板部分

<template>
  <div 
    @mousedown="handleMouseDown"
    @mousemove="handleMouseMove"
    @mouseup="handleMouseUp"
  >
    <div 
      v-for="(item, index) in items" 
      :key="index"
      :class="{ 'selected': selectedItems.includes(index) }"
      class="selectable-item"
    >
      {{ item }}
    </div>
  </div>
</template>

脚本部分

<script>
export default {
  data() {
    return {
      items: ['Item 1', 'Item 2', 'Item 3', 'Item 4'],
      selectedItems: [],
      isSelecting: false
    }
  },
  methods: {
    handleMouseDown() {
      this.isSelecting = true
    },
    handleMouseMove(e) {
      if (!this.isSelecting) return

      const target = e.target.closest('.selectable-item')
      if (!target) return

      const index = [...target.parentNode.children].indexOf(target)
      if (!this.selectedItems.includes(index)) {
        this.selectedItems.push(index)
      }
    },
    handleMouseUp() {
      this.isSelecting = false
    }
  }
}
</script>

样式部分

<style>
.selectable-item {
  padding: 8px;
  margin: 4px;
  border: 1px solid #ddd;
  cursor: pointer;
}
.selectable-item.selected {
  background-color: #42b983;
  color: white;
}
</style>

高级优化方案

添加Shift键多选支持

handleMouseDown(e) {
  this.isSelecting = true
  if (e.shiftKey && this.selectedItems.length > 0) {
    const target = e.target.closest('.selectable-item')
    const lastSelected = this.selectedItems[this.selectedItems.length - 1]
    const currentIndex = [...target.parentNode.children].indexOf(target)

    const start = Math.min(lastSelected, currentIndex)
    const end = Math.max(lastSelected, currentIndex)

    for (let i = start; i <= end; i++) {
      if (!this.selectedItems.includes(i)) {
        this.selectedItems.push(i)
      }
    }
  }
}

性能优化 使用Set代替数组存储选中项，优化查找性能：

data() {
  return {
    selectedItems: new Set()
  }
},
methods: {
  handleMouseMove(e) {
    // ...
    if (!this.selectedItems.has(index)) {
      this.selectedItems.add(index)
    }
  }
}

完整组件示例

<template>
  <div class="multi-select-container">
    <div 
      v-for="(item, index) in items"
      :key="index"
      :class="{ 'selected': selectedItems.has(index) }"
      class="selectable-item"
      @mousedown="handleMouseDown($event, index)"
      @mouseenter="handleMouseEnter(index)"
    >
      {{ item }}
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: Array.from({ length: 20 }, (_, i) => `Item ${i + 1}`),
      selectedItems: new Set(),
      isSelecting: false,
      lastSelected: null
    }
  },
  methods: {
    handleMouseDown(e, index) {
      this.isSelecting = true

      if (e.shiftKey && this.lastSelected !== null) {
        const start = Math.min(this.lastSelected, index)
        const end = Math.max(this.lastSelected, index)

        for (let i = start; i <= end; i++) {
          this.selectedItems.add(i)
        }
      } else {
        if (e.ctrlKey || e.metaKey) {
          if (this.selectedItems.has(index)) {
            this.selectedItems.delete(index)
          } else {
            this.selectedItems.add(index)
          }
        } else {
          this.selectedItems.clear()
          this.selectedItems.add(index)
        }
      }

      this.lastSelected = index
    },
    handleMouseEnter(index) {
      if (this.isSelecting) {
        this.selectedItems.add(index)
        this.lastSelected = index
      }
    },
    handleMouseUp() {
      this.isSelecting = false
    }
  },
  mounted() {
    window.addEventListener('mouseup', this.handleMouseUp)
  },
  beforeDestroy() {
    window.removeEventListener('mouseup', this.handleMouseUp)
  }
}
</script>