javascript - 选择默认值不起作用reactjs

Question

我试图默认选择一个值到选择输入中，但输入无法识别该值，直到我手动更改它。默认情况下，我将“全部”设置为默认值。这是我的代码和codesandbox链接:

import "./styles.css";
import React, { useState, useEffect } from "react";
import { FormField } from "react-form-input-fields";
import "react-form-input-fields/dist/index.css";

export default function App() {
  let [type, setType] = useState("All");
  const types = [
    { label: "All", value: "All" },
    { label: "Afganistan", value: "Afganistan" },
    { label: "Albania", value: "Albania" },
    { label: "Algeria", value: "Algeria" },
    { label: "American Samoa", value: "American Samoa" },
    { label: "Andorra", value: "Andorra" },
    { label: "Angola", value: "Angola" }
  ];

  function handletype(e) {
    setType(e);
  }

  return (
    <div className="App">
      {/* <h1>Hello CodeSandbox</h1>
      <h2>Start editing to see some magic happen!</h2> */}
      <FormField
        type="select"
        value={type}
        option={types}
        label={"Select your type"}
        keys={"label"}
        handleOnChange={(value) => handletype(value)}
      />
    </div>
  );
}

链接:

https://codesandbox.io/s/select-problem-ykplcm

Answer 1

您使用的库有错误

source code显示 value 属性仅在 componendDidUpdate 中检查，但初始渲染时不会调用此钩子(Hook)

我宁愿使用不同的库