本文章记录,如何在vue3项目开发中,使用ip输入框组件.
之前写过vue2版本的ip组件,为了更好的适应vue3,此次进行vue3代码重写
几乎涵盖电脑上自带的IP输入框效果,如有问题,欢迎留言探讨.
先上效果图:

禁用效果图:

主要是组件的开发,代码如下,可直接拷贝使用.
大概思路就是: 使用四个输入框拼接,然后给输入内容添加校验操作,添加光标移动,
使用v-model语法糖特性

组件: IpAddress.vue

<template>
  <div :class="{ 'disabled': disabled }">
    <ul class="ipAdress">
      <li v-for="(item, index) in ipAddress" :key="index">
        <input :ref="el => getInputRef(el, index)" v-model="item.value" type="text" class="ipInputClass"
          :disabled="disabled" @input="checkIpVal(item)" @keyup="$event => turnIpPosition(item, index, $event)"
          @blur="handleBlur" @mouseup="handleMouseUp(index)" />
        <div></div>
      </li>
    </ul>
  </div>
</template>

<script lang="ts" setup name="routePage">
import { ref, watch } from 'vue'

// 接收来自上层的数据
const props = defineProps(['value', 'disabled'])

// 更新数据
const $emits = defineEmits(['update:value', 'blur'])

// 存储四个ref
const ipInputRefs = ref<HTMLElement[]>([]);
// 存储左右标识位
let markFlag = ref([
  {
    left: false,
    right: false
  },
  {
    left: false,
    right: false
  },
  {
    left: false,
    right: false
  },
  {
    left: false,
    right: false
  }
])

// 更新标识
let flag = ref(false)

// 鼠标点击
const handleMouseUp = (index: any) => {
  let input = ipInputRefs.value[index]
  // 全为false
  markFlag.value.forEach(item => {
    item.left = false
    item.right = false
  })
  // 证明在开始阶段
  if (input.selectionStart == 0) {
    console.log('鼠标设置了,', index)
    markFlag.value[index].left = true
  } else {
    markFlag.value[index].left = false
  }
  // 证明在结束
  if (input.selectionStart == (input.value || '').length) {
    markFlag.value[index].right = true
  } else {
    markFlag.value[index].right = false
  }
}

// 获取四个input refs
const getInputRef = (el: any, index: number) => {
  if (el) {
    ipInputRefs.value[index] = el;
  }
};
// 声明IP存储类型
interface IpType {
  value: string
}
// 定义要显示的四个ip
let ipAddress = ref<IpType[]>([
  {
    value: "",
  },
  {
    value: "",
  },
  {
    value: "",
  },
  {
    value: "",
  },
])
// 初始化显示数据
const initShowData = () => {
  // 判断不合理行为
  if (props.value === '') {
    ipAddress.value.forEach(item => {
      item.value = ''
    })
  } else {
    let ipList = props.value.split('.')
    ipAddress.value.forEach((item: IpType, index: number) => {
      item.value = ipList[index]
    })
  }
}

// 检查ip输入
const checkIpVal = (item: any) => {
  let val = item.value;
  console.log(val, '===========')
  // 处理非数字
  val = val.toString().replace(/[^0-9]/g, "");
  val = parseInt(val, 10);
  if (isNaN(val)) {
    val = "";
  } else {
    val = val < 0 ? 0 : val;
    if (val > 255) {
      // 判断val是几位数
      let num = (val + '').length
      if (num > 3) {
        val = parseInt((val + '').substring(0, 3))
      } else {
        val = 255
      }
    }
  }
  item.value = val;
  console.log(item.value, '=========')
}

// 判断光标左右移动位置
const turnIpPosition = (item: IpType, index: number, event: any) => {
  let e = event || window.event;
  if (e.keyCode === 37) {
    // 左箭头向左跳转，左一不做任何措施
    if (index == 0) {
      return
    }
    if (e.currentTarget.selectionStart === 0) {
      if (markFlag.value[index].left) {
        handleFocus(index - 1, 'toLeft')
        markFlag.value[index].left = false
        markFlag.value[index].right = false
      } else {
        console.log('左键设置了,', index)
        markFlag.value[index].left = true
      }
    } else {
      markFlag.value[index].right = false
      markFlag.value[index].left = false
    }
  } else if (e.keyCode == 39) {
    // 右箭头向右跳转，右一不做任何措施
    markFlag.value[index].left = false
    let start = e.currentTarget.selectionStart
    if (index != 3 && start === item.value.toString().length) {
      if (markFlag.value[index].right) {
        handleFocus(index + 1, 'toRight')
        markFlag.value[index].left = false
        markFlag.value[index].right = false
      } else {
        markFlag.value[index].right = true
      }
    } else {
      markFlag.value[index].right = false
    }
  } else if (e.keyCode === 8) {
    console.log('删除键把当前数据删除完毕后会跳转到前一个input')
    // 删除键把当前数据删除完毕后会跳转到前一个input，左一不做任何处理
    if (index !== 0 && e.currentTarget.selectionStart === 0) {
      if (markFlag.value[index].left) {
        ipInputRefs.value[index - 1].focus();
        markFlag.value[index].left = false
      } else {
        console.log('左键设置了删除,', index)
        markFlag.value[index].left = true
      }
    }
  } else if (e.keyCode === 13 || e.keyCode === 32) {
    console.log('回车键、空格键、冒号均向右跳转，右一不做任何措施')
    // 回车键、空格键、冒号均向右跳转，右一不做任何措施
    if (index !== 3) {
      ipInputRefs.value[index + 1].focus();
    }
  }
  else if (e.keyCode === 110 || e.keyCode === 190) {
    // 点 . 向右跳转，右一不做任何措施
    console.log('点击')
    if (item.value == '') {
      return
    }
    if (index !== 3) {
      ipInputRefs.value[index + 1].select();
    }
  }
  else if (item.value.toString().length === 3) {
    console.log('满3位，光标自动向下一个文本框')
    // 满3位，光标自动向下一个文本框.
    if (index !== 3) {
      ipInputRefs.value[index + 1].setSelectionRange(0, 0)
    }
  }
}

// 处理聚焦
const handleFocus = (index: number, direction: string) => {
  // 设置当前位置为选中状态 toRight:从左边来的
  let input = ipInputRefs.value[index]
  input.focus()
  let value = input.value
  // null 左右全部设置为true,可以直接跳转
  if ((value || '').length == 0) {
    markFlag.value[index].right = true
    markFlag.value[index].left = true
  } else {
    if (direction == 'toRight') {
      // 可以直接跳回
      console.log('右键focus,', index)
      markFlag.value[index].left = true
      // 设置光标为左边第一个
      ipInputRefs.value[index].setSelectionRange(0, 0)
      // 设置上一个的右边标识为false
      markFlag.value[index - 1] && (markFlag.value[index - 1].right = false)
    } else {
      // 直接跳回
      markFlag.value[index].right = true
      // 设置后一个侧边为false
      markFlag.value[index + 1] && (markFlag.value[index + 1].left = false)
    }
  }
}


// 格式化补零方法
const formatter = (val: string) => {
  let value = val.toString();
  if (value.length === 2) {
    value = "0" + value;
  } else if (value.length === 1) {
    value = "00" + value;
  } else if (value.length === 0) {
    value = "000";
  }
  return value;
}

// 监听数据变化,并初始化显示四个数据
watch(() => props.value, () => {
  console.log('变化了~', props.value);
  if(flag.value){

  }else{
    initShowData()
  }
}, {
  immediate: true
})

// 监听ipAddress数据变化
watch(ipAddress, () => {
  let str = "";
  for (const i in ipAddress.value) {
    str += formatter(ipAddress.value[i].value);
  }
  if (str === "000000000000") {
    str = "";
  } else {
    str = ipAddress.value.map(item => {
      if (item.value !== null) {
        return item.value + ''
      } else {
        return '0'
      }
    }).join(".")
  }
  $emits('update:value', str)
  flag.value = true
  setTimeout(() => {
    flag.value = false
  }, 100)
}, {
  deep: true
})

const handleBlur = () => {
  $emits('blur')
}

</script>
<style lang="scss" scoped>
.disabled {
  cursor: not-allowed;
  background-color: #f5f7fa;

  .ipAdress {
    li {
      .ipInputClass {
        color: #c3c4cc;
        cursor: not-allowed;
      }
    }
  }
}

.ipAdress {
  display: flex;
  border: 1px solid #dcdfe6;
  border-radius: 4px;
  line-height: 40px;
  width: 100%;
  height: 40px;
  padding-inline-start: 0px;
  padding-left: 10px;
  padding-right: 10px;
  box-sizing: border-box;
  margin: 0;
}

.ipAdress li {
  position: relative;
  margin: 0;
  list-style-type: none;
}

.ipInputClass {
  border: none;
  width: 50px;
  height: 23px;
  text-align: center;
  color: #606266;
  background: transparent;
}

.ipAdress li div {
  position: absolute;
  bottom: 12px;
  right: 0;
  border-radius: 50%;
  background: #b6b8bc;
  width: 2px;
  height: 2px;
}

/*只需要3个div*/
.ipAdress li:last-child div {
  display: none;
}

/*取消掉默认的input focus状态*/
.ipAdress input:focus {
  outline: none;
}
</style>

注册为组件以后,在页面中使用如下，当然，组件名自己定义，我这里组件名是IpAddress

// ipAddress双向绑定,handleBlur 可以在失去光标时，做校验等操作
<IpAddress v-model:value="ipAddress" @blur="handleBlur" :disabled="true"/>