微信小程序车牌键盘输入组件（支持单个删除更改，支持赋值，支持新能源）

网上一搜一大堆类似但大多都相对简单，适用的场景并不多。多数也不支持赋值 不支持单个删除更改
我就借鉴了一下网上文章的思路，为了达到自己想要的效果做了相对应的更改。

效果图如下：

直接上代码！

WXML代码：

点击查看代码

<!-- 车牌号码输入框 -->
<view wx:if="{{isSplit}}" class="com-vehicle">
  <view wx:for="{{carNum}}" wx:key="id" class="text-center inline-block" bind:tap='openKeyboard'>
    <!-- 点 -->
    <text wx:if="{{ index === 2 }}" class="inline-block ml-5 mr-5">.</text>
    <!-- 普通车牌 -->
    <input wx:if="{{ index !== 7 }}" value="{{ item.value }}" data-index="{{index}}" disabled class="com-carNumber-item car-number-item {{ item.focus ? 'com-focus' : ''}}" bindinput="updateCarNum" />
    <!-- 新能源车牌 -->
    <input wx:else value="{{!showNewPower ? '+' : item.value }}" data-index="{{index}}" disabled class="com-carNumber-item car-number-item {{showNewPower ? item.focus ? 'com-focus' : '': 'com-carNumber-item-newpower'}}" bindinput="updateCarNum" />
  </view>
</view>
<view wx:else>
  <input model:value="{{ vehicleNo }}" maxlength="8" placeholder="请输入车牌号" disabled="{{inputDisabled}}" focus="{{inputFocus}}" cursor="{{inputCursor}}" class="com-input" bind:tap='openKeyboard' bindinput="updateVehicleNo" />
</view>

<!-- 虚拟键盘 -->
<view class="com-keyboard" hidden='{{!KeyboardState}}'>
  <view class="com-keyboardConfirm flex-center">
    <text class="com-vehicleTip bold flex-center">请输入车牌号</text>
    <view class="com-separator"></view>
    <view wx:if="{{!isSplit}}" class="com-keyboardConfirm_btn bold" bindtap='switchKeyboard'>切换键盘</view>
    <view class="com-keyboardConfirm_btn bold" bindtap='closeKeyboard'>关闭</view>
  </view>
  <!-- 省份简写键盘 -->
  <view class="com-keyboard-item" hidden="{{ focusIndex !== 0 }}">
    <view wx:for="{{provinces}}" wx:key="index" class="com-keyboard-line">
      <view wx:for="{{item}}" wx:key="index" wx:for-item="char" data-val="{{char}}" class="com-keyboard-btn" bindtap='bindChoose'>{{char}}</view>
    </view>
  </view>
  <!-- 车牌号码选择键盘 -->
  <view class="com-keyboard-item com-carNumber" hidden="{{focusIndex === 0}}">
    <!-- 数字键盘 -->
    <view wx:for="{{numbers}}" wx:key="index" class="com-keyboard-line">
      <view wx:for="{{item}}" wx:key="index" wx:for-item="char" data-val="{{char}}" class="{{ focusIndex !== 1 ? 'com-keyboard-btn' : 'com-keyboard-disabled-btn' }}" bindtap="{{ focusIndex !== 1 ? 'bindChoose' : '' }}">{{char}}</view>
    </view>
    <!-- 字母键盘 -->
    <view wx:for="{{letters}}" wx:key="index" class="com-keyboard-line">
      <view wx:for="{{item}}" wx:key="index" wx:for-item="char" data-val="{{char}}" class="{{ focusIndex !== 6 && (char === '挂' || char === '港' || char === '澳' || char === '学') ? 'com-keyboard-disabled-btn' : 'com-keyboard-btn'}}" bindtap="bindChoose">{{char}}</view>
    </view>
    <view class="com-keyboard-del" bindtap='bindDelChoose'>
      <text class="fs-40">删除</text>
    </view>
  </view>
</view>

JS代码：

点击查看代码

import { isEmpty } from '../../utils/util';
const icon = 'none', duration = 3000

const component = {
  externalClasses: ['car-number-item'], // 提供给父组件外部设置样式
  properties: {
    vehicleNo: { type: String, value: undefined }, // 车牌号
    isSplit: { type: Boolean, value: false } // 是否将车牌拆分为单个字符
  },
  data: {
    provinces: [ // 省份键盘
      ['京', '沪', '粤', '津', '冀', '晋', '蒙', '辽', '吉', '黑'],
      ['苏', '浙', '皖', '闽', '赣', '鲁', '豫', '鄂', '湘'],
      ['桂', '琼', '渝', '川', '贵', '云', '藏'],
      ['陕', '甘', '青', '宁', '新']
    ],
    numbers: [ // 数字键盘
      ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
    ],
    letters: [ // 字母键盘
      ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K'],
      ['L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V'],
      ['W', 'X', 'Y', 'Z', '挂', '港', '澳', '学']
    ],
    specialChar: ['挂', '港', '澳', '学'], // 特殊字符
    carNum: Array(8).fill({ value: undefined, focus: false }),
    inputDisabled: true, // 虚拟键盘时禁用input。避免弹出系统键盘
    inputFocus: false, // input操作时获取焦点（车牌不拆分单个字符，显示为input输入框时）
    inputCursor: true, // input获取焦点弹出系统键盘时光标所在位置
    focusIndex: 0, // 输入时焦点索引（车牌拆分为单个字符时）
    showNewPower: false, // 是否新能源车牌
    KeyboardState: false // 是否弹出虚拟键盘
  },
  attached() {
    const v = this
    const vehcles = v.data.vehicleNo.split('')
    const carNum = v.data.carNum
    let showNewPower = v.data.showNewPower
    vehcles.forEach((m, i) => { carNum[i].value = m })
    if (!isEmpty(carNum[7].value)) showNewPower = true
    v.setData({ carNum, showNewPower })
  },
  /**
 * 组件的方法列表
 */
  methods: {
    // 车牌输入框点击展开车牌键盘
    openKeyboard(e) {
      const v = this
      // 车牌不拆分为单个字符时 只弹出键盘
      if (!v.data.isSplit) {
        v.setData({ KeyboardState: true, focusIndex: v.data.vehicleNo.length, inputDisabled: true, inputFocus: false })
        wx.hideKeyboard()
      }
      // 车牌拆分为单个字符
      else {
        const focusIndex = e.target.dataset.index
        let carNum = v.data.carNum
        let showNewPower = v.data.showNewPower

        // 添加新能源尾数
        if (focusIndex === 7) {
          if (isEmpty(carNum[6].value)) return wx.showToast({ title: '为新能源车牌时，前几位车牌号不能为空', icon, duration })
          if (v.data.specialChar.includes(carNum[6].value)) return wx.showToast({ title: `为新能源车牌时，第6位车牌号不能为'${carNum[6].value}'`, icon, duration })

          showNewPower = true
          v.setData({ showNewPower, KeyboardState: true })
        }

        // 当前点击获得焦点，其余失去焦点
        carNum[focusIndex].focus = true
        carNum = carNum.map((item, index) => {
          return { ...item, focus: index === focusIndex ? item.focus : false }
        })
        // 点击索引不为新能源且新能源无值时
        if (focusIndex !== 7 && isEmpty(carNum[7].value)) showNewPower = false

        v.setData({ KeyboardState: true, focusIndex, carNum, showNewPower })
      }
    },
    // 键盘选中点击设置
    bindChoose(e) {
      const v = this
      const val = e.target.dataset.val
      // 车牌不拆分为单个字符时
      if (!v.data.isSplit) {
        if (v.data.vehicleNo.length < 8) {
          const vehicleNo = v.data.vehicleNo.concat(val)
          v.setData({ vehicleNo, focusIndex: vehicleNo.length })
          v.triggerEvent('change', { vehicleNo })
        }
      }
      // 车牌拆分为单个字符
      else {
        const carNum = v.data.carNum
        let focusIndex = v.data.focusIndex
        if (focusIndex !== 6 && v.data.specialChar.includes(val)) return

        // 当前选中车牌无值时更新为输入值
        if (isEmpty(carNum[focusIndex].value)) {
          carNum[focusIndex].value = val
          carNum[focusIndex].focus = false

          const validate = v.data.showNewPower ? 7 : 6
          // 上一位车牌取消聚焦
          if (focusIndex < validate) focusIndex++
          carNum[focusIndex].focus = true

          v.setData({ carNum, focusIndex })
        }
        const vehicleNo = carNum.map(m => m.value).join('')
        v.triggerEvent('change', { vehicleNo })
      }
    },
    // 删除
    bindDelChoose() {
      const v = this
      // 车牌不拆分为单个字符时
      if (!v.data.isSplit) {
        const vehicleNo = v.data.vehicleNo.slice(0, -1)
        v.setData({ vehicleNo, focusIndex: vehicleNo.length })
        v.triggerEvent('change', { vehicleNo })
      }
      // 车牌拆分为单个字符
      else {
        const carNum = v.data.carNum
        let focusIndex = v.data.focusIndex
        let showNewPower = v.data.showNewPower

        // 如果删除第6位后继续删除 则focusIndex后退一位并删除第5位车牌 依此类推 
        // 当删除至省份位车牌时，界面会控制取消删除按钮
        if (isEmpty(carNum[focusIndex].value)) {
          // 如果当前索引是新能源车牌 
          if (focusIndex == 7) showNewPower = false
          focusIndex--
          carNum[focusIndex].value = undefined
          carNum[focusIndex].focus = true
          // 后一位车牌取消聚焦
          carNum[focusIndex + 1].focus = false
        }
        else {
          carNum[v.data.focusIndex].value = undefined
          carNum[v.data.focusIndex].focus = true
        }

        v.setData({ carNum, focusIndex, showNewPower })
        const vehicleNo = carNum.map(m => m.value).join('')
        v.triggerEvent('change', { vehicleNo })
      }
    },
    // 切换键盘
    switchKeyboard() {
      this.setData({ KeyboardState: false, inputDisabled: false }, () => {
        setTimeout(() => {
          this.setData({ inputFocus: true, inputCursor: this.data.vehicleNo.length })
        }, 50)
      })
    },
    // 关闭虚拟键盘
    closeKeyboard() {
      const v = this
      // 车牌不拆分为单个字符时
      if (!v.data.isSplit) v.setData({ inputDisabled: true, inputFocus: false })
      v.setData({ KeyboardState: false })
    },
    // 车牌不拆分为单个字符时，更新车牌
    updateCarNum(e) {
      const index = e.currentTarget.dataset.index
      const value = e.detail.value
      this.setData({ [`carNum[${index}].value`]: value })
    },
    // 系统键盘输入时
    updateVehicleNo() { this.triggerEvent('change', { vehicleNo: this.data.vehicleNo }) }
  }
}

Component(component);

WXSS代码：

点击查看代码

.com-vehicle {
  white-space: nowrap;
}

/* 车牌号码 */
.com-input {
  height: 60rpx;
  width: 465rpx;
  background-color: rgba(242, 242, 242, 1);
  box-sizing: border-box;
  padding: 0 20rpx;
  border-radius: 6rpx;
  margin-left: 50rpx;
}

/* 拆分单个字符 车牌号码 */
.com-carNumber-item {
  width: 55rpx;
  height: 60rpx;
  font-size: 18px;
  border: 2rpx solid #CCCCCC;
  border-radius: 8rpx;
  display: inline-block;
  line-height: 30px;
  margin: 0 2rpx;
  vertical-align: middle;
  caret-color: transparent;
}

.com-focus {
  border: 3rpx solid #A8BFF3;
}

/* 新能源 */
.com-carNumber-item-newpower {
  border: 2rpx dashed #19e622;
  background-color: #e1fde2;
  color: #19e622;
  font-size: 25px;
  line-height: 45rpx;
}

/* 虚拟键盘 */
.com-keyboard {
  height: auto;
  background: #d1d5d9;
  position: fixed;
  bottom: 0;
  width: 100%;
  left: 0;
  padding-bottom: 30rpx;
}

.com-keyboard-item {
  padding: 10rpx 0 5rpx 0;
  position: relative;
  display: block;
}

.com-vehicleTip {
  flex: 1;
  color: rgba(150, 179, 253, 1);
}

.com-separator {
  width: 1px;
  height: 50%;
  background-color: #ccc;
  margin: 0 10px;
}

.com-keyboardConfirm {
  height: 70rpx;
  background-color: #f7f7f7;
}

.com-keyboardConfirm_btn {
  float: right;
  line-height: 70rpx;
  font-size: 15px;
  margin-right: 30rpx;
  color: #FFA500;
}

.com-keyboard-line {
  margin: 0 auto;
  text-align: center;
}

.com-carNumber .com-keyboard-line {
  text-align: left;
  margin-left: 5rpx;
}

.com-keyboard-btn {
  font-size: 18px;
  color: #333333;
  background: #fff;
  display: inline-block;
  padding: 18rpx 0;
  width: 63rpx;
  text-align: center;
  box-shadow: 0 2rpx 0 0 #999999;
  border-radius: 10rpx;
  margin: 5rpx 6rpx;
}

.com-keyboard-disabled-btn {
  font-size: 18px;
  color: #333333;
  background: #cacaca;
  display: inline-block;
  padding: 18rpx 0;
  width: 63rpx;
  text-align: center;
  box-shadow: 0 2rpx 0 0 #999999;
  border-radius: 10rpx;
  margin: 5rpx 6rpx;
}

.com-keyboard-del {
  color: black;
  background: #A7B0BC;
  display: inline-block;
  padding: 10rpx 25rpx;
  box-shadow: 0 2rpx 0 0 #999999;
  border-radius: 10rpx;
  margin: 5rpx;
  position: absolute;
  bottom: 10rpx;
  right: 12rpx;
}

公用样式代码（app.wxss）：

点击查看代码

.text-center {
  text-align: center;
}

.inline-block {
  display: inline-block;
}

.ml-5 {
  margin-left: 5rpx;
}

.mr-5 {
  margin-right: 5;
}

.fs-40 {
  font-size: 40rpx;
}

.bold {
  font-weight: bold;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

公用JS代码：

点击查看代码

/**
 * 是否都是空数据（类型：字符串，数值，对象，数组，布尔）
 */
const isEmpty = (...values) => {
  const isEmptyFunc = (val) => {
    switch (typeof val) {
      case 'string':
      case 'number': return !val // 数值0为空
      case 'object':
        // 数组
        if (Array.isArray(val)) return val.length === 0
        // null/对象
        return val === null || Object.keys(val).length === 0
      case 'boolean': return false // 布尔类型即非空
      // undefined / function
      default: return true
    }
  }
  let result = true
  values.forEach(m => { result = result && isEmptyFunc(m) })

  return result
}

/**
 * 验证
 */
const validate = {
  /** 是车牌号 */
  vehicle(value) {
    let result = false
    if (value && [7, 8].includes(value.length)) {
      const express = /^[京津沪渝冀豫云辽黑湘皖鲁新苏浙赣鄂桂甘晋蒙陕吉闽贵粤青藏川宁琼使领A-Z]{1}[A-Z]{1}[A-Z0-9]{4,5}[A-Z0-9挂学警港澳]{1}$/
      result = express.test(value)
    }
    return result
  }
}

调用方式：
json文件：

点击查看代码

{
  "navigationBarTitleText": "车牌号输入",
  "usingComponents": {
    "vehicle-keyboard": "../../../../components/vehicle-keyboard/index"
  }
}

js：

点击查看代码

// 车牌输入组件完成
confirmVehicle(e) { this.setData({ shipNo: e.detail.vheicleNo }) }

wxml：

点击查看代码

<vehicle-keyboard vehicleNo="{{vehicleNo}}" bind:confirm="confirmVehicle"></vehicle-keyboard>

上面gif生成是用 Windows 系统 Win+Shift+S 将操作截图成视频，再去这个网站 https://www.aconvert.com/cn/video/mp4-to-gif/ 将视频转成GIF

预览的时候把图片下载下来
录制gif的时候有个小bug，已被我修复。
两种模式 isSplit为true 车牌拆分成一个个小框显示，否则文本框显示同时可以切换系统键盘