quanyawei
2023-10-20 d8b41fff43a2cee6a8f714ffa807623b15803786
uni_modules/uview-ui/components/u-code-input/u-code-input.vue
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<template>
   <view class="u-code-input">
      <view
         class="u-code-input__item"
         :style="[itemStyle(index)]"
         v-for="(item, index) in codeLength"
         :key="index"
      >
         <view
            class="u-code-input__item__dot"
            v-if="dot && codeArray.length > index"
         ></view>
         <text
            v-else
            :style="{
               fontSize: $u.addUnit(fontSize),
               fontWeight: bold ? 'bold' : 'normal',
               color: color
            }"
         >{{codeArray[index]}}</text>
         <view
            class="u-code-input__item__line"
            v-if="mode === 'line'"
            :style="[lineStyle]"
         ></view>
         <!-- #ifndef APP-PLUS -->
         <view v-if="isFocus && codeArray.length === index" :style="{backgroundColor: color}" class="u-code-input__item__cursor"></view>
         <!-- #endif -->
      </view>
      <input
         :disabled="disabledKeyboard"
         type="number"
         :focus="focus"
         :value="inputValue"
         :maxlength="maxlength"
         :adjustPosition="adjustPosition"
         class="u-code-input__input"
         @input="inputHandler"
         :style="{
            height: $u.addUnit(size)
         }"
         @focus="isFocus = true"
         @blur="isFocus = false"
      />
   </view>
</template>
<script>
   import props from './props.js';
   /**
    * CodeInput 验证码输入
    * @description 该组件一般用于验证用户短信验证码的场景,也可以结合uView的键盘组件使用
    * @tutorial https://www.uviewui.com/components/codeInput.html
    * @property {String | Number}   maxlength         最大输入长度 (默认 6 )
    * @property {Boolean}         dot               是否用圆点填充 (默认 false )
    * @property {String}         mode            显示模式,box-盒子模式,line-底部横线模式 (默认 'box' )
    * @property {Boolean}         hairline         是否细边框 (默认 false )
    * @property {String | Number}   space            字符间的距离 (默认 10 )
    * @property {String | Number}   value            预置值
    * @property {Boolean}         focus            是否自动获取焦点 (默认 false )
    * @property {Boolean}         bold            字体和输入横线是否加粗 (默认 false )
    * @property {String}         color            字体颜色 (默认 '#606266' )
    * @property {String | Number}   fontSize         字体大小,单位px (默认 18 )
    * @property {String | Number}   size            输入框的大小,宽等于高 (默认 35 )
    * @property {Boolean}         disabledKeyboard   是否隐藏原生键盘,如果想用自定义键盘的话,需设置此参数为true (默认 false )
    * @property {String}         borderColor         边框和线条颜色 (默认 '#c9cacc' )
    * @property {Boolean}         disabledDot         是否禁止输入"."符号 (默认 true )
    *
    * @event {Function}   change   输入内容发生改变时触发,具体见上方说明         value:当前输入的值
    * @event {Function}   finish   输入字符个数达maxlength值时触发,见上方说明   value:当前输入的值
    * @example   <u-code-input v-model="value4" :focus="true"></u-code-input>
    */
   export default {
      name: 'u-code-input',
      mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
      data() {
         return {
            inputValue: '',
            isFocus: this.focus
         }
      },
      watch: {
         value: {
            immediate: true,
            handler(val) {
               // 转为字符串,超出部分截掉
               this.inputValue = String(val).substring(0, this.maxlength)
            }
         },
      },
      computed: {
         // 根据长度,循环输入框的个数,因为头条小程序数值不能用于v-for
         codeLength() {
            return new Array(Number(this.maxlength))
         },
         // 循环item的样式
         itemStyle() {
            return index => {
               const addUnit = uni.$u.addUnit
               const style = {
                  width: addUnit(this.size),
                  height: addUnit(this.size)
               }
               // 盒子模式下,需要额外进行处理
               if (this.mode === 'box') {
                  // 设置盒子的边框,如果是细边框,则设置为0.5px宽度
                  style.border = `${this.hairline ? 0.5 : 1}px solid ${this.borderColor}`
                  // 如果盒子间距为0的话
                  if (uni.$u.getPx(this.space) === 0) {
                     // 给第一和最后一个盒子设置圆角
                     if (index === 0) {
                        style.borderTopLeftRadius = '3px'
                        style.borderBottomLeftRadius = '3px'
                     }
                     if (index === this.codeLength.length - 1) {
                        style.borderTopRightRadius = '3px'
                        style.borderBottomRightRadius = '3px'
                     }
                     // 最后一个盒子的右边框需要保留
                     if (index !== this.codeLength.length - 1) {
                        style.borderRight = 'none'
                     }
                  }
               }
               if (index !== this.codeLength.length - 1) {
                  // 设置验证码字符之间的距离,通过margin-right设置,最后一个字符,无需右边框
                  style.marginRight = addUnit(this.space)
               } else {
                  // 最后一个盒子的有边框需要保留
                  style.marginRight = 0
               }
               return style
            }
         },
         // 将输入的值,转为数组,给item历遍时,根据当前的索引显示数组的元素
         codeArray() {
            return String(this.inputValue).split('')
         },
         // 下划线模式下,横线的样式
         lineStyle() {
            const style = {}
            style.height = this.hairline ? '2px' : '4px'
            style.width = uni.$u.addUnit(this.size)
            // 线条模式下,背景色即为边框颜色
            style.backgroundColor = this.borderColor
            return style
         }
      },
      methods: {
         // 监听输入框的值发生变化
         inputHandler(e) {
            const value = e.detail.value
            this.inputValue = value
            // 是否允许输入“.”符号
            if(this.disabledDot) {
               this.$nextTick(() => {
                  this.inputValue = value.replace('.', '')
               })
            }
            // 未达到maxlength之前,发送change事件,达到后发送finish事件
            this.$emit('change', value)
            // 修改通过v-model双向绑定的值
            this.$emit('input', value)
            // 达到用户指定输入长度时,发出完成事件
            if (String(value).length >= Number(this.maxlength)) {
               this.$emit('finish', value)
            }
         }
      }
   }
</script>
<style lang="scss" scoped>
   @import "../../libs/css/components.scss";
   $u-code-input-cursor-width: 1px;
   $u-code-input-cursor-height: 40%;
   $u-code-input-cursor-animation-duration: 1s;
   $u-code-input-cursor-animation-name: u-cursor-flicker;
   .u-code-input {
      @include flex;
      position: relative;
      overflow: hidden;
      &__item {
         @include flex;
         justify-content: center;
         align-items: center;
         position: relative;
         &__text {
            font-size: 15px;
            color: $u-content-color;
         }
         &__dot {
            width: 7px;
            height: 7px;
            border-radius: 100px;
            background-color: $u-content-color;
         }
         &__line {
            position: absolute;
            bottom: 0;
            height: 4px;
            border-radius: 100px;
            width: 40px;
            background-color: $u-content-color;
         }
         /* #ifndef APP-PLUS */
         &__cursor {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%,-50%);
            width: $u-code-input-cursor-width;
            height: $u-code-input-cursor-height;
            animation: $u-code-input-cursor-animation-duration u-cursor-flicker infinite;
         }
         /* #endif */
      }
      &__input {
         // 之所以需要input输入框,是因为有它才能唤起键盘
         // 这里将它设置为两倍的屏幕宽度,再将左边的一半移出屏幕,为了不让用户看到输入的内容
         position: absolute;
         left: -750rpx;
         width: 1500rpx;
         top: 0;
         background-color: transparent;
         text-align: left;
      }
   }
   /* #ifndef APP-PLUS */
   @keyframes u-cursor-flicker {
      0% {
          opacity: 0;
      }
      50% {
          opacity: 1;
      }
      100% {
          opacity: 0;
      }
   }
   /* #endif */
</style>