Vue3 + TypeScript + Element Plus + el-input 输入框列表按回车聚焦到下一行

应用效果：从第一行输入1，按回车，聚焦到第二行输入2，按回车，聚焦到第三行……

一、通过元素 id，聚焦到下一行的输入框

关键技术点：

1、动态设置元素 id 属性为：:id="`input-apply-amount-${(option as IReagentOption).id}`"

2、设置回车监听：@keyup.enter.native="onEnterPressDown((option as IReagentOption).id)"

                <el-input
                  ......
                  :id="`input-apply-amount-${(option as IReagentOption).id}`"
                  @keyup.enter.native="onEnterPressDown((option as IReagentOption).id)" />

3、通过 document.getElementById 获取到指定元素

4、focus 和 select，聚焦、全选

// 通过元素 id，聚焦到下一行的输入框
const focusNextRowByElementId = (objId: number) => {
  // 通过 objId 获取当前行索引
  let currentRowIndex = selectedOptionIds.value.indexOf(objId);
  // 下一行的输入框
  let nextInput: HTMLInputElement;
  if (currentRowIndex + 1 < selectedOptionIds.value.length) {
    // 下一行索引的 objId
    let nextRowObjId = selectedOptionIds.value[currentRowIndex + 1];
    nextInput = document.getElementById(`input-apply-amount-${nextRowObjId}`) as HTMLInputElement;
  } else {
    // 最后一行聚焦到申领用途输入框
    nextInput = document.getElementById("transfer-right-footer-purpose-input") as HTMLInputElement;
  }
  nextInput?.focus();
  nextInput?.select();
};

二、通过元素 ref，聚焦到下一行的输入框

关键技术点：

1、动态设置元素 ref 属性为：:ref="`input-apply-amount-${(option as IReagentOption).id}`"

2、设置回车监听：@keyup.enter.native="onEnterPressDown((option as IReagentOption).id)"

                <el-input
                  ......
                  :ref="`input-apply-amount-${(option as IReagentOption).id}`"
                  @keyup.enter.native="onEnterPressDown((option as IReagentOption).id)" />

3、通过 getCurrentInstance() 获取当前组件实例，再通过 refs 获取到元素列表

4、focus 和 select，聚焦、全选

<script setup lang="ts" name="ReagentApplyDialog">
......
import { getCurrentInstance } from "vue";

// 当前组件实例，相当 vue2 的this
const thisInstance = getCurrentInstance();

// 通过元素 ref，聚焦到下一行的输入框
const focusNextRowByElementRef = (objId: number) => {
  if (!thisInstance) return;

  // 获取输入框实例 Record
  let refs = thisInstance.refs as Record<string, HTMLInputElement>;

  // 通过 objId 获取当前行索引
  let currentRowIndex = selectedOptionIds.value.indexOf(objId);
  if (currentRowIndex + 1 < selectedOptionIds.value.length) {
    // 下一行索引的 objId
    let nextRowObjId = selectedOptionIds.value[currentRowIndex + 1];
    // 聚焦到下一行的输入框
    refs[`input-apply-amount-${nextRowObjId}`].focus();
    refs[`input-apply-amount-${nextRowObjId}`].select();
  } else {
    // 最后一行聚焦到申领用途输入框
    refs["transfer-right-footer-purpose-input"].focus();
    refs["transfer-right-footer-purpose-input"].select();
  }
};
......
</script>

实例完整代码：

<script setup lang="ts" name="ReagentApplyDialog">
......
import { getCurrentInstance, nextTick, onMounted, ref, watch } from "vue";

// 当前组件实例，相当 vue2 的this
const thisInstance = getCurrentInstance();

// 按回车，申领数量输入框按回车
const onEnterPressDown = (objId: number) => {
  // 奇数
  if (objId % 2 === 1) {
    // 通过元素 id，聚焦到下一行的输入框
    focusNextRowByElementId(objId);
  }
  // 偶数
  else {
    // 通过元素 ref，聚焦到下一行的输入框
    focusNextRowByElementRef(objId);
  }
};

// 通过元素 id，聚焦到下一行的输入框
const focusNextRowByElementId = (objId: number) => {
  // 通过 objId 获取当前行索引
  let currentRowIndex = selectedOptionIds.value.indexOf(objId);
  // 下一行的输入框
  let nextInput: HTMLInputElement;
  if (currentRowIndex + 1 < selectedOptionIds.value.length) {
    // 下一行索引的 objId
    let nextRowObjId = selectedOptionIds.value[currentRowIndex + 1];
    nextInput = document.getElementById(`input-apply-amount-${nextRowObjId}`) as HTMLInputElement;
  } else {
    // 最后一行聚焦到申领用途输入框
    nextInput = document.getElementById("transfer-right-footer-purpose-input") as HTMLInputElement;
  }
  nextInput?.focus();
  nextInput?.select();
};

// 通过元素 ref，聚焦到下一行的输入框
const focusNextRowByElementRef = (objId: number) => {
  if (!thisInstance) return;

  // 获取输入框实例 Record
  let refs = thisInstance.refs as Record<string, HTMLInputElement>;

  // 通过 objId 获取当前行索引
  let currentRowIndex = selectedOptionIds.value.indexOf(objId);
  if (currentRowIndex + 1 < selectedOptionIds.value.length) {
    // 下一行索引的 objId
    let nextRowObjId = selectedOptionIds.value[currentRowIndex + 1];
    // 聚焦到下一行的输入框
    refs[`input-apply-amount-${nextRowObjId}`].focus();
    refs[`input-apply-amount-${nextRowObjId}`].select();
  } else {
    // 最后一行聚焦到申领用途输入框
    refs["transfer-right-footer-purpose-input"].focus();
    refs["transfer-right-footer-purpose-input"].select();
  }
};
......
</script>

<template>
......
        <el-transfer
          ......>
          <!-- 自定义列表数据项的内容 -->
          <template #default="{ option }">
                ......
                <el-input
                  v-if="selectedOptionIds.includes((option as IReagentOption).id)"
                  :ref="`input-apply-amount-${(option as IReagentOption).id}`"
                  :id="`input-apply-amount-${(option as IReagentOption).id}`"
                  class="input-apply-amount"
                  style="width: 85px; text-align: center"
                  v-model="(option as IReagentOption).applyAmount"
                  placeholder="输入申领数量"
                  size="small"
                  clearable
                  @input="(option as IReagentOption).applyAmount = Number(formatToNumber($event, 0))"
                  @keyup.enter.native="onEnterPressDown((option as IReagentOption).id)" />
                ......
          </template>
        </el-transfer>
......
</template>