我如何阻止用户在 React 上提交相同的表单

Question

我有一个网站正在使用我构建的表单构建。

代码如下：

import React, { useState } from "react";

const Form = () => {
  const [formData, setFormData] = useState({});
  const [message, setMessage] = useState("");

  const handleInput = (e) => {
    const copyFormData = { ...formData };
    copyFormData[e.target.name] = e.target.value;
    setFormData(copyFormData);
  };

  const sendData = async (e) => {
    e.preventDefault();

    const { name, email, message } = formData;
    try {
      const response = await fetch(
        "MYKEY",

        {
          method: "post",
          body: JSON.stringify([[name, email, message]]),
          headers: {
            "Content-Type": "application/json",
          },
        }
      );

      const json = await response.json();
      console.log("Success", JSON.stringify(json));
      setMessage("Thanks for subscribing!");
    } catch (error) {
      console.error("Error:", error);
      setMessage("There seems to be a problem");
    }
  };

  return (
    <div className=" p-3 w-full md:p-24">
      <form
        className="w-full border-solid border-black border-4 items-center"
        id="contact"
        name="contact"
        required
        onSubmit={sendData}
      >
        <div className="text-center mt-4 mb-5">
          <h2 className="font-semibold text-4xl mb-2 md:mt-10 md:text-6xl md:mb-4">
            newsletter
          </h2>
          <p className="text-gray-500 md:text-2xl">lets stay connected</p>
        </div>

        <div className="flex flex-wrap flex-col md:justify-center md:flex-row p-2">
          <input
            className="bg-gray-100 mb-4 h-10 w-full  p-4 text-gray-500 md:w-1/5 md:mx-3 md:h-14"
            name="name"
            type="text"
            placeholder="name"
            required
            onChange={handleInput}
          ></input>

          <input
            className="bg-gray-100 mb-4 h-10 w-full  p-4 text-gray-500 md:w-2/5 md:mx-3 md:h-14"
            name="email"
            type="email"
            placeholder="email"
            required
            onChange={handleInput}
          ></input>
          <input
            className="bg-blue-600 font-semibold tracking-wider mb-4 h-12 w-full text-white justify-center items-center md:h-14 md:w-1/6 md:mx-3"
            name="subscribe"
            type="submit"
            value="subscribe"
          ></input>
          <div className="font-semibold tracking-wider mb-4 text-black text-center justify-center items-center">
            {message}
          </div>
        </div>
      </form>
    </div>
  );
};

但是，当用户提交表单时，他们可以一直按订阅按钮，这让我提交了很多。

如何阻止人们重新提交？并且只提交一次。

我以为 preventDefault 会阻止这种情况发生，但仍然找不到解决方案。

提前致谢！

Answer 1

这可以充实更多，但你明白了。提交数据时状态会发生变化。

import React, { useState } from "react";

const Form = () => {
  const [formData, setFormData] = useState({});
  const [message, setMessage] = useState("");
  const [loading, setLoading] = useState("idle");

  const handleInput = (e) => {
    const copyFormData = { ...formData };
    copyFormData[e.target.name] = e.target.value;
    setFormData(copyFormData);
  };

  const sendData = async (e) => {
    e.preventDefault();
    setLoading("loading");
    const { name, email, message } = formData;
    try {
      const response = await fetch(
        "MYKEY",
        {
          method: "post",
          body: JSON.stringify([[name, email, message]]),
          headers: {
            "Content-Type": "application/json",
          },
        }
      );

      const json = await response.json();
      console.log("Success", JSON.stringify(json));
      setLoading("submitted");
      setMessage("Thanks for subscribing!");
    } catch (error) {
      console.error("Error:", error);
      setMessage("There seems to be a problem");
      setLoading("idle");
    }
  };

  return (
    <div className=" p-3 w-full md:p-24">
      <form
        className="w-full border-solid border-black border-4 items-center"
        id="contact"
        name="contact"
        required
        onSubmit={sendData}
      >
        <div className="text-center mt-4 mb-5">
          <h2 className="font-semibold text-4xl mb-2 md:mt-10 md:text-6xl md:mb-4">
            newsletter
          </h2>
          <p className="text-gray-500 md:text-2xl">lets stay connected</p>
        </div>

        <div className="flex flex-wrap flex-col md:justify-center md:flex-row p-2">
          <input
            className="bg-gray-100 mb-4 h-10 w-full  p-4 text-gray-500 md:w-1/5 md:mx-3 md:h-14"
            name="name"
            type="text"
            placeholder="name"
            required
            onChange={handleInput}
          ></input>

          <input
            className="bg-gray-100 mb-4 h-10 w-full  p-4 text-gray-500 md:w-2/5 md:mx-3 md:h-14"
            name="email"
            type="email"
            placeholder="email"
            required
            onChange={handleInput}
          ></input>
          {loading === "idle" &&
            <input
            className="bg-blue-600 font-semibold tracking-wider mb-4 h-12 w-full text-white justify-center items-center md:h-14 md:w-1/6 md:mx-3"
            name="subscribe"
            type="submit"
            value="subscribe"
          ></input>
          }
        
          <div className="font-semibold tracking-wider mb-4 text-black text-center justify-center items-center">
            {message}
          </div>
        </div>
      </form>
    </div>
  );
};

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