如何在imask库中避免删除起始日期末位后被结束日期字符替换？

可以通过在IMask配置中添加overwrite: false，并确保各日期块的placeholderChar配置正确，实现删除起始日期最后一个字符时用指定占位符填充，而非被结束日期的数字替换。

修改后的代码 #

import { IMask, useIMask } from "react-imask";

export default function App() {
  const { ref } = useIMask<HTMLInputElement>({
    mask: "from - to",
    pattern: "d`.m`.0000 - d`.m`.0000",
    blocks: {
      from: {
        mask: Date,
        blocks: {
          d: {
            mask: IMask.MaskedRange,
            placeholderChar: "д",
            from: 1,
            to: 31,
            maxLength: 2,
          },
          m: {
            mask: IMask.MaskedRange,
            placeholderChar: "м",
            from: 1,
            to: 12,
            maxLength: 2,
          },
          Y: {
            mask: IMask.MaskedRange,
            placeholderChar: "г",
            from: 1900,
            to: 2999,
            maxLength: 4,
          },
        },
      },
      to: {
        mask: Date,
        blocks: {
          d: {
            mask: IMask.MaskedRange,
            placeholderChar: "д",
            from: 1,
            to: 31,
            maxLength: 2,
          },
          m: {
            mask: IMask.MaskedRange,
            placeholderChar: "м",
            from: 1,
            to: 12,
            maxLength: 2,
          },
          Y: {
            mask: IMask.MaskedRange,
            placeholderChar: "г",
            from: 1900,
            to: 2999,
            maxLength: 4,
          },
        },
      },
    },
    lazy: true,
    placeholderChar: " ",
    overwrite: false, // 关键配置：关闭覆盖模式，删除后用占位符填充空缺位置
  });

  return (
    <div className="App">
      <input ref={ref} style={{ width: 180 }} />
    </div>
  );
}

原理说明 #

• overwrite: false：禁用IMask默认的「删除字符后用后续内容补位」行为，改为删除后用对应块的placeholderChar填充空缺位置。
• 各日期块独立配置placeholderChar：确保删除起始日期的字符时，空缺处显示对应的д/м/г占位符，而非结束日期的内容。

内容的提问来源于stack exchange，提问作者Сергей Анохин