<input-number-range :disabled="isDisabled" :precision="num" v-model="value"></input-number-range>

<template>
  <div>
    <div class="input-number-range" :class="{ 'is-disabled': disabled }">
      <div class="flex">
        <div class="from">
          <!--
          blur:最小值失焦事件
          focus:最小值聚焦事件
          input:最小值輸入事件
          change:最小值change事件
          -->
          <el-input
            ref="input_from"
            v-model="userInputForm"
            :disabled="disabled"
            placeholder="最小值"
            @blur="handleBlurFrom"
            @focus="handleFocusFrom"
            @input="handleInputFrom"
            @change="handleInputChangeFrom"
          ></el-input>
        </div>
        <div class="center">
          <span>至</span>
        </div>
        <div class="to">
           <!--
          blur:最大值失焦事件
          focus:最大值聚焦事件
          input:最大值輸入事件
          change:最大值change事件
          -->
          <el-input
            ref="input_to"
            v-model="userInputTo"
            :disabled="disabled"
            placeholder="最大值"
            @blur="handleBlurTo"
            @focus="handleFocusTo"
            @input="handleInputTo"
            @change="handleInputChangeTo"
          ></el-input>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: "InputNumberRange",

  /** 組件接收參數(shù) */
  props: {
    value: { required: true },

    // 是否禁用
    disabled: {
      type: Boolean,
      default: false,
    },

    // 精度參數(shù)
    precision: {
      type: Number,
      default: 0,
      validator(val) {
        return val >= 0 && val === parseInt(val, 10);
      },
    },
  },

  data() {
    return {
      userInputForm: null, // 最小值
      userInputTo: null, // 最大值
    };
  },

  watch: {
  /** 監(jiān)聽value實(shí)現(xiàn)雙向綁定 */
    value: {
      immediate: true,
      handler(value) {
         // 判斷是否為數(shù)字number類型
        if (value instanceof Array && this.precision !== undefined) {
          let fromVal =
            value[0] && typeof value[0] === "number" ? value[0] : null;
          let toVal =
            value[1] && typeof value[1] === "number" ? value[1] : null;
          this.userInputForm = fromVal ? fromVal : null;
          this.userInputTo = toVal ? toVal : null;
        }
      },
    },
  },

  methods: {
    // 根據(jù)精度保留數(shù)字
    toPrecision(num, precision) {
      if (precision === undefined) precision = 0;
      return parseFloat(
        Math.round(num * Math.pow(10, precision)) / Math.pow(10, precision)
      );
    },
    
    /** 觸發(fā)以下事件時(shí)自動(dòng)向上冒泡執(zhí)行(通過emit將事件拋給element input組件) */
    handleBlurFrom(event) {
      this.$emit("blurfrom", event);
    },

    handleFocusFrom(event) {
      this.$emit("focusfrom", event);
    },

    handleBlurTo(event) {
      this.$emit("blurto", event);
    },

    handleFocusTo(event) {
      this.$emit("focusto", event);
    },

    handleInputFrom(value) {
      this.$emit("inputfrom", value);
      this.userInputFrom = value;
    },

    handleInputTo(value) {
      this.$emit("inputto", value);
      this.userInputTo = value;
    },

    // from輸入框change事件
    handleInputChangeFrom(value) {
      const newVal = this.setPrecisionValue(value);
      this.userInputForm = newVal;
      // 如果初始化數(shù)字的精度不符合代碼設(shè)置時(shí)重置數(shù)字
      this.userInputTo = this.setPrecisionValue(this.userInputTo);
      if (!this.userInputForm && !this.userInputTo) {
        this.$emit("input", []);
        this.$emit("changefrom", newVal);
        return;
      }

      if (!this.userInputTo) {
        this.userInputForm = newVal;
      } else {
        // 最小值大于最大值時(shí)邏輯判斷
        this.userInputForm =
          !newVal || parseFloat(newVal) <= parseFloat(this.userInputTo)
            ? newVal
            : this.userInputTo;
      }
      this.$emit("input", [this.userInputForm, this.userInputTo]);
      this.$emit("changefrom", newVal);
    },

    // to輸入框change事件
    handleInputChangeTo(value) {
      const newVal = this.setPrecisionValue(value);
      this.userInputTo = newVal;
      this.userInputForm = this.setPrecisionValue(this.userInputForm);
      if (!this.userInputTo && !this.userInputForm) {
        this.$emit("input", []);
        this.$emit("changefrom", newVal);
        return;
      }

      if (!this.userInputForm) {
        this.userInputTo = newVal;
      } else {
        // 最大值小于最小值時(shí)邏輯判斷
        this.userInputTo =
          !newVal || parseFloat(newVal) >= parseFloat(this.userInputForm)
            ? newVal
            : this.userInputForm;
      }
      this.$emit("input", [this.userInputForm, this.userInputTo]);
      this.$emit("changeto", newVal);
    },

    // 設(shè)置成精度數(shù)字
    setPrecisionValue(value) {
      if (!value) return null;
      const newVal = Number(value);
      // 如果是非數(shù)字空返回null
      if (isNaN(value)) return null;
      if (typeof newVal === "number" && this.precision !== undefined) {
        const val = this.toPrecision(value, this.precision);
        return val;
      }
      return null;
    },
  },
};
</script>

<style lang="scss" scoped>
// 取消element原有的input框樣式
::v-deep .el-input .el-input__inner {
  border: 0px;
  margin: 0;
  padding: 0 15px;
  background-color: transparent;
  text-align: center;
}

.input-number-range {
  background-color: #fff;
  border: 1px solid #dcdfe6;
  border-radius: 4px;
}

.flex {
  display: flex;
  flex-direction: row;
  width: 100%;
  justify-content: center;
  align-items: center;
  .center {
    margin-top: 1px;
  }
}

.is-disabled {
  background-color: #f5f7fa;
  border-color: #e4e7ed;
  color: #c0c4cc;
  cursor: not-allowed;
}
</style>

<template>
  <div>
   <InputNumberRange></InputNumberRange>
  </div>
</template>

<script>
import InputNumberRange from './components/inputNumberRange.vue'
export default { 
    name: "XXXX"
    components: {
    InputNumberRange,
  },
  data() {}
}
</script>

import InputNumberRange from './components/inputNumberRange.vue' 
Vue.component(InputNumberRange.name, InputNumberRange)

<template>
  <div class="main">
    <!-- 演示操作按鈕模塊 -->
    <div class="caseHeader">
      <div>
        <el-switch
          v-model="isDisabled"
          size="small"
          active-text="禁用"
          @change="switchChange"
        >
        </el-switch>
      </div>
      <div style="display: flex">
        <span>精度：</span>
        <el-input-number
          size="small"
          v-model="num"
          @change="precisionChange"
          :min="0"
          :max="10"
          label="描述文字"
        ></el-input-number>
      </div>
      <div>
        <el-button type="link" size="small" @click="reset">重置</el-button>
      </div>
    </div>
    <!-- 數(shù)字區(qū)間使用模塊 -->
    <div class="numberRange">
      <el-form ref="form" :model="formData" label-width="80px">
        <el-form-item label="數(shù)字區(qū)間">
          <input-number-range
            :disabled="isDisabled"
            :precision="num"
            v-model="formData.numberRange"
          ></input-number-range>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: "TestCase",
  data() {
    return {
      isDisabled: false, // 是否禁用
      num: 0, // 精度
      formData: {
        numberRange: [],
      },
    };
  },
  methods: {
    /** 重置方法 */
    reset() {
      this.formData.numberRange = [];
    }
  },
};
</script>

<style lang="scss" scoped>
.main {
  width: 100%;
  margin: 16px;
  position: relative;
}

.numberRange {
  width: 400px;
}

.caseHeader {
  width: 400px;
  display: flex;
  justify-content: space-between;
  margin: 24px;
}
</style>