手写可拖动穿梭框组件CustormTransfer vue实现示例

Vue
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2023-06-15
目录
  • 本文内容
  • 最终效果图
  • 组件html布局
  • 穿梭框左侧内容
  • 穿梭框右侧内容
  • 穿梭框中间向左、向右按钮
  • 把排序好的穿梭数据传给父组件
  • 整体代码
  • 小结

本文内容

需求是实现类似 el-transfer的组件,右侧框内容可以拖动排序;

手写div样式 + vuedraggable组件实现。

最终效果图

组件html布局

新建一个组件文件 CustormTransfer.vue,穿梭框 html 分为左中右三部分,使用flex布局使其横向布局,此时代码如下

<template>
  <div class="custom-transfer-cls">
    <div class="left-side"></div>
    <div class="btn-cls"></div>
    <div class="right-side"></div>
  </div>
</template>
<script>
export default {
  name: 'CustomTransferName',
  components: {},
  props: {},
  data () {
    return { }
  },
  computed: { },
  created () {},
  mounted () { },
  methods: {}
}
</script>
<style lang="less" scoped>
.custom-transfer-cls {
  display: flex;
  justify-content: space-between;
  min-height:px;
  .left-side,
  .right-side {}
  .btn-cls { }
}
</style>

此时页面上看不到组件内容。

穿梭框左侧内容

左侧内容是个列表,列表的每一项是多选框checkbox加文字标题,列表最上面是标题;所以.left-side的代码如下:

<div class="left-side">
  <!-- 标题 -->
  <h>{{ titles[0] }}</h4>
  <!-- 列表 -->
  <div v-for="left in leftData" :key="left.key" class="item-cls">
    <el-checkbox :checked="left.checked" @change="leftCheckChange(left)" />
    <span :title="left.label">{{ left.label }}</span>
  </div>
  <!-- 数据为空时显示 -->
  <div v-if="leftData.length ===" class="empty-text">{{ emptypText }}</div>
</div>

解析:

  • 列表标题使用h4标签,titles是组件使用者传入props的标题数组的第一项;
  • 列表数据 leftData是组件使用者传入的数据处理之后的,因为我们默认el-checkbox不勾选,所以在生命周期mounted时,checked设为false;
  • el-checkbox触发change事件时,执行函数leftCheckChange(left),去改变leftData数组对应项的checked设为取反;
  • 当leftData数据为空时,显示数据为空的文本,此文本组件使用者可通过 属性 emptypText 传入,默认'数据为空';
  • 列表的每一项的样式在 .item-cls 定义,内容过长时显示省略号,在 title 属性中显示全部内容;
  • 列表整体内容多时,显示滚动条,滚动条样式重写;

以上内容加上样式、函数后如下:

<template>
  <div class="custom-transfer-cls">
    <div class="left-side"></div>
    <div class="btn-cls"></div>
    <div class="right-side"></div>
  </div>
</template>
<script>
export default {
  name: 'CustomTransferName',
  components: {},
  props: {
    allData: {
      type: Array,
      default: () => {
        // 对象数组需要有label、key两个属性
        return []
      }
    },
    emptypText: {
      type: String,
      default: '数据为空'
    },
    titles: {
      type: Array,
      default: () => {
        return ['列表', '列表 2']
      }
    }
  },
  data () {
    return {
      leftData: []
    }
  },
  computed: { },
  created () {},
  mounted () {
    // 初始化列表的数据
    this.leftData = this.allData.map(a => {
      a.checked = false
      return a
    })
  },
  methods: {
    // 左边checkbox的change事件
    leftCheckChange (check) {
      this.leftData = this.leftData.map(l => {
        if (l.key === check.key) {
          l.checked = !l.checked
        }
        return l
      })
    }
  }
}
</script>
<style lang="less" scoped>
.custom-transfer-cls {
  display: flex;
  justify-content: space-between;
  min-height:px;
  .left-side {
    height:px;
    overflow-y: scroll;
    background-color: white;
    width:px;
    border:px solid #eee;
    border-radius:px;
    h {
      /* 列表标题在列表滚动时吸附在顶部 */
      position: sticky;
      top:px;
      z-index:;
      background: white;
      text-align: center;
      font-weight:;
      margin-bottom:px;
    }
    /* 数据为空的样式 */
    .empty-text {
      text-align: center;
      color: #ccc;
    }
    /* 列表每项的样式,文字很长时显示省略号 */
    .item-cls {
      margin-left:px;
      margin-right:px;
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
    }
    /* 列表的滚动条样式重写 */
    &::-webkit-scrollbar {
      width:px;
    }
    &::-webkit-scrollbar-thumb {
      background: #ccc;
    }
    &::-webkit-scrollbar-track {
      background: #ededed;
    }
  }
  .btn-cls { }
}
</style>

穿梭框右侧内容

右侧的列表需要具有可拖动排序的功能,我使用的使 vuedraggable组件,所以首先需要先安装npm install vuedraggable -S, 再引入 import draggable from 'vuedraggable',使用时配合 <transition-group>增加过渡效果;代码如下:

<div class="right-side">
  <h>{{ titles[1] }}</h4>
  <draggable v-model="rightData">
    <transition-group>
      <div v-for="(right, index) in rightData" :key="right.key" class="item-cls">
        <el-checkbox :checked="right.checked" @change="rightCheckChange(right)" />
        <span>{{ index + + '.' }}</span>
        <span :title="right.label">{{ right.label }}</span>
      </div>
    </transition-group>
  </draggable>
  <div v-if="rightData.length ===" class="empty-text">{{ emptypText }}</div>
</div>

解析:

  • 右侧的列表样式和左侧一样;
  • 只是多了一个<draggable></draggable>组件的使用

此时整体的代码如下:

<template>
  <div class="custom-transfer-cls">
    <!-- 左侧列表 -->
    <div class="left-side">
      <h>{{ titles[0] }}</h4>
      <div v-for="left in leftData" :key="left.key" class="item-cls">
        <el-checkbox :checked="left.checked" @change="leftCheckChange(left)" />
        <span :title="left.label">{{ left.label }}</span>
      </div>
      <div v-if="leftData.length ===" class="empty-text">{{ emptypText }}</div>
    </div>
    <!-- 向左、向右操作按钮 -->
    <div class="btn-cls"></div>
    <!-- 右侧列表 -->
    <div class="right-side">
      <h>{{ titles[1] }}</h4>
      <draggable v-model="rightData">
        <transition-group>
          <div v-for="(right, index) in rightData" :key="right.key" class="item-cls">
            <el-checkbox :checked="right.checked" @change="rightCheckChange(right)" />
            <span>{{ index + + '.' }}</span>
            <span :title="right.label">{{ right.label }}</span>
          </div>
        </transition-group>
      </draggable>
      <div v-if="rightData.length ===" class="empty-text">{{ emptypText }}</div>
    </div>
  </div>
</template>
<script>
import draggable from 'vuedraggable'
export default {
  name: 'CustomTransferName',
  components: {
    draggable
  },
  props: {
    allData: {
      type: Array,
      default: () => {
        // 对象数组需要有label、key两个属性
        return []
      }
    },
    checkedData: {
      type: Array,
      default: () => {
        // 对象数组需要有label、key两个属性
        return []
      }
    },
    emptypText: {
      type: String,
      default: '数据为空'
    },
    titles: {
      type: Array,
      default: () => {
        return ['标题', '标题2']
      }
    }
  },
  data () {
    return {
      leftData: [],
      rightData: []
    }
  },
  computed: {},
  created () {},
  mounted () {
    // 初始化左侧列表的数据
    this.leftData = this.allData.map(a => {
      a.checked = false
      return a
    })
    // 初始化右侧列表的数据
    this.rightData = this.checkedData.map(a => {
      a.checked = false
      return a
    })
  },
  methods: {
    // 左边选中
    leftCheckChange (check) {
      this.leftData = this.leftData.map(l => {
        if (l.key === check.key) {
          l.checked = !l.checked
        }
        return l
      })
    },
    // 右边选中
    rightCheckChange (check) {
      this.rightData = this.rightData.map(l => {
        if (l.key === check.key) {
          l.checked = !l.checked
        }
        return l
      })
    }
  }
}
</script>
<style lang="less" scoped>
.custom-transfer-cls {
  display: flex;
  justify-content: space-between;
  min-height:px;
  .left-side,
  .right-side {
    height:px;
    overflow-y: scroll;
    background-color: white;
    width:px;
    border:px solid #eee;
    border-radius:px;
    h {
      /* 列表标题在列表滚动时吸附在顶部 */
      position: sticky;
      top:px;
      z-index:;
      background: white;
      text-align: center;
      font-weight:;
      margin-bottom:px;
    }
    /* 数据为空的样式 */
    .empty-text {
      text-align: center;
      color: #ccc;
    }
    /* 列表每项的样式,文字很长时显示省略号 */
    .item-cls {
      margin-left:px;
      margin-right:px;
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
    }
    /* 列表的滚动条样式重写 */
    &::-webkit-scrollbar {
      width:px;
    }
    &::-webkit-scrollbar-thumb {
      background: #ccc;
    }
    &::-webkit-scrollbar-track {
      background: #ededed;
    }
  }
}
</style>

穿梭框中间向左、向右按钮

穿梭框的向左、向右按钮,使用<el-button icon="el-icon-arrow-right"></el-button>实现,代码如下:

<div class="btn-cls">
  <el-button
    :disabled="toRightDisable"
    plain
    type="default"
    size="small"
    icon="el-icon-arrow-right"
    @click="toRight"
  />
  <el-button
    :disabled="toLeftDisable"
    class="right-btn"
    plain
    type="default"
    size="small"
    icon="el-icon-arrow-left"
    @click="toLeft"
  />
</div>

解析:

  • 按钮的禁用disabled逻辑,在computed中定义toRightDisable、toLeftDisable;
  • 按钮的点击事件 toRight、toLeft,是对左右两侧列表数组的运算;

此部分的代码如下:

<template>
  <div class="custom-transfer-cls">
    <div class="left-side"></div>
    <!-- 向左、向右按钮开始 -->
    <div class="btn-cls">
      <el-button
        :disabled="toRightDisable"
        plain
        type="default"
        size="small"
        icon="el-icon-arrow-right"
        @click="toRight"
      />
      <el-button
        :disabled="toLeftDisable"
        class="right-btn"
        plain
        type="default"
        size="small"
        icon="el-icon-arrow-left"
        @click="toLeft"
      />
    </div>
    <!-- 向左、向右按钮结束 -->
    <div class="right-side"></div>
  </div>
</template>
<script>
export default {
  name: 'CustomTransferName',
  components: { },
  props: {},
  data () {
    return {
      leftData: [],
      rightData: []
    }
  },
  computed: {
    // 向左穿梭按钮的disabled逻辑
    toLeftDisable () {
      return !this.rightData.some(r => r.checked)
    },
    // 向右穿梭按钮的disabled逻辑
    toRightDisable () {
      return !this.leftData.some(r => r.checked)
    }
  },
  created () {},
  mounted () { },
  methods: {
    // 数据向右穿梭
    toRight () {
      // 左减去,右加上
      const leftUnchecked = this.leftData.filter(l => !l.checked)
      const leftChecked = this.leftData.filter(l => l.checked)
      this.leftData = leftUnchecked
      this.rightData = [].concat(this.rightData, leftChecked).map(r => {
        r.checked = false
        return r
      })
    },
    // 数据向左穿梭
    toLeft () {
      // 右减去,左加上
      const rightUnchecked = this.rightData.filter(l => !l.checked)
      const rightChecked = this.rightData.filter(l => l.checked)
      this.rightData = rightUnchecked
      this.leftData = [].concat(this.leftData, rightChecked).map(r => {
        r.checked = false
        return r
      })
    }
  }
}
</script>
<style lang="less" scoped>
.custom-transfer-cls {
  display: flex;
  justify-content: space-between;
  min-height:px;
  .btn-cls {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    .right-btn {
      margin-left:;
      margin-top:px;
    }
  }
}
</style>

把排序好的穿梭数据传给父组件

即把rightData: []数据通过$emit()传递出去,父组件监听dragedData事件之后获取; 定义函数 transferData(),在拖动完成时的@end事件调用,在向左向右更新了右侧列表数据之后调用;

代码如下:

methods: {
  // 传递数据
  transferData () {
    this.$emit('dragedData', this.rightData)
  }
}

整体代码

<template>
  <div class="custom-transfer-cls">
    <!-- 左侧列表 -->
    <div class="left-side">
      <h>{{ titles[0] }}</h4>
      <div v-for="left in leftData" :key="left.key" class="item-cls">
        <el-checkbox :checked="left.checked" @change="leftCheckChange(left)" />
        <span :title="left.label">{{ left.label }}</span>
      </div>
      <div v-if="leftData.length ===" class="empty-text">{{ emptypText }}</div>
    </div>
    <!-- 向左、向右按钮开始 -->
    <div class="btn-cls">
      <el-button
        :disabled="toRightDisable"
        plain
        type="default"
        size="small"
        icon="h-icon-angle_right"
        @click="toRight"
      />
      <el-button
        :disabled="toLeftDisable"
        class="right-btn"
        plain
        type="default"
        size="small"
        icon="h-icon-angle_left"
        @click="toLeft"
      />
    </div>
    <!-- 右侧列表 -->
    <div class="right-side">
      <h>{{ titles[1] }}</h4>
      <draggable v-model="rightData" @end="transferData">
        <transition-group>
          <div v-for="(right, index) in rightData" :key="right.key" class="item-cls">
            <el-checkbox :checked="right.checked" @change="rightCheckChange(right)" />
            <span>{{ index + + '.' }}</span>
            <span :title="right.label">{{ right.label }}</span>
          </div>
        </transition-group>
      </draggable>
      <div v-if="rightData.length ===" class="empty-text">{{ emptypText }}</div>
    </div>
  </div>
</template>
<script>
// 可拖动组件
import draggable from 'vuedraggable'
export default {
  name: 'CustomTransferName',
  components: {
    draggable
  },
  props: {
    allData: {
      type: Array,
      default: () => {
        // 对象数组需要有label、key两个属性
        return []
      }
    },
    checkedData: {
      type: Array,
      default: () => {
        // 对象数组需要有label、key两个属性
        return []
      }
    },
    emptypText: {
      type: String,
      default: '数据为空'
    },
    titles: {
      type: Array,
      default: () => {
        return ['标题', '标题2']
      }
    }
  },
  data () {
    return {
      leftData: [],
      rightData: []
    }
  },
  computed: {
    // 向左穿梭按钮的disabled逻辑
    toLeftDisable () {
      return !this.rightData.some(r => r.checked)
    },
    // 向右穿梭按钮的disabled逻辑
    toRightDisable () {
      return !this.leftData.some(r => r.checked)
    }
  },
  created () {},
  mounted () {
    // 初始化左侧列表的数据
    this.leftData = this.allData.map(a => {
      a.checked = false
      return a
    })
    // 初始化右侧列表的数据
    this.rightData = this.checkedData.map(a => {
      a.checked = false
      return a
    })
  },
  methods: {
    // 传递数据
    transferData () {
      this.$emit('dragedData', this.rightData)
    },
    // 左边选中
    leftCheckChange (check) {
      this.leftData = this.leftData.map(l => {
        if (l.key === check.key) {
          l.checked = !l.checked
        }
        return l
      })
    },
    // 右边选中
    rightCheckChange (check) {
      this.rightData = this.rightData.map(l => {
        if (l.key === check.key) {
          l.checked = !l.checked
        }
        return l
      })
    },
    // 数据向右穿梭
    toRight () {
      // 左减去,右加上
      const leftUnchecked = this.leftData.filter(l => !l.checked)
      const leftChecked = this.leftData.filter(l => l.checked)
      this.leftData = leftUnchecked
      this.rightData = [].concat(this.rightData, leftChecked).map(r => {
        r.checked = false
        return r
      })
      // 传递数据
      this.transferData()
    },
    // 数据向左穿梭
    toLeft () {
      // 右减去,左加上
      const rightUnchecked = this.rightData.filter(l => !l.checked)
      const rightChecked = this.rightData.filter(l => l.checked)
      this.rightData = rightUnchecked
      this.leftData = [].concat(this.leftData, rightChecked).map(r => {
        r.checked = false
        return r
      })
      // 传递数据
      this.transferData()
    }
  }
}
</script>
<style lang="less" scoped>
.custom-transfer-cls {
  display: flex;
  justify-content: space-between;
  min-height:px;
  .left-side,
  .right-side {
    height:px;
    overflow-y: scroll;
    background-color: white;
    width:px;
    border:px solid #eee;
    border-radius:px;
    /* 标题样式 */
    h {
      position: sticky;
      top:px;
      z-index:;
      background: white;
      text-align: center;
      font-weight:;
      margin-bottom:px;
    }
    /* 数据为空时的样式 */
    .empty-text {
      text-align: center;
      color: #ccc;
    }
    /* 列表每一项样式 */
    .item-cls {
      margin-left:px;
      margin-right:px;
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
    }
    /* 列表滚动条样式 */
    &::-webkit-scrollbar {
      width:px;
    }
    &::-webkit-scrollbar-thumb {
      background: #ccc;
    }
    &::-webkit-scrollbar-track {
      background: #ededed;
    }
  }
  /* 按钮样式 */
  .btn-cls {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    .right-btn {
      margin-left:;
      margin-top:px;
    }
  }
}
</style>