我将数据从孩子 1 发送到父母,然后发送到孩子 2。现在我需要发送三件事;日、月和年的值。只获取一个值就可以了,但当我尝试获取所有三个值时,我得到了一个 TypeError。
家长:
import Results from "./Results";
import TopForm from "./TopForm";
import { useState } from "react";
function Hero() {
const [dayValue, setDayValue] = useState("--");
const [monthValue, setMonthValue] = useState("--");
const [yearValue, setYearValue] = useState("--");
return (
<div className="font-poppins bg-light-grey p-2 h-screen w-screen">
{/* Main Container */}
<div className="container bg-white mt-16 max-w-[95%] md:max-w-2xl mx-auto p-10 rounded-xl rounded-br-3xl">
<TopForm
// This does not work, Uncaught TypeError: callback is not a function
// callback={[setDayValue, setMonthValue, setYearValue]}
// This does work but only gets the dayValue
callback={setDayValue}
/>
<Results
dayValue={dayValue}
monthValue={monthValue}
yearValue={yearValue}
/>
</div>
</div>
);
}
export default Hero;
Child 1(TopForm 获取数据)
import { useState } from "react";
function TopForm({ callback }) {
const [error, setError] = useState(false);
const [dayText, setDayText] = useState("");
const [monthText, setMonthText] = useState("");
const [yearText, setYearText] = useState("");
const handleSubmit = (event) => {
event.preventDefault();
setDayText("");
setMonthText("");
setYearText("");
};
return (
// Inputs Container
<form onSubmit={handleSubmit}>
{/* Upper Form */}
<div className="container flex justify-center gap-4 md:max-w-lg">
<div className="container w-1/3 flex flex-col">
<label
htmlFor="day"
className={`if ${error} ? "text-red-400 text-sm mb-1 uppercase tracking-wide" : "text-smokey-grey"`}
id="day-label"
>
Day
</label>
<input
type="number"
name="day"
id="day"
required
className="border-solid border-2 border-light-grey rounded-md p-3 text-lg outline-none focus:border-purple"
onChange={(event) => setDayText(event.target.value)}
value={dayText}
/>
<div
id="day-error"
className="hidden text-xs text-red-400 mt-2"
>
Must be a valid date
</div>
</div>
<div className="container w-1/3 flex flex-col">
<label
htmlFor="month"
id="month-label"
className="text-smokey-grey text-sm mb-1 uppercase tracking-wide"
>
Month
</label>
<input
type="number"
name="month"
id="month"
required
className="border-solid border-2 border-light-grey rounded-md p-3 text-lg outline-none focus:border-purple"
onChange={(event) => setMonthText(event.target.value)}
value={monthText}
/>
<div
id="month-error"
className="hidden text-xs text-red-400 mt-2"
>
Must be a valid date
</div>
</div>
<div className="container w-1/3 flex flex-col">
<label
htmlFor="year"
id="year-label"
className="text-smokey-grey text-sm mb-1 uppercase tracking-wide"
>
Year
</label>
<input
type="number"
name="year"
id="year"
required
className="border-solid border-2 border-light-grey rounded-md p-3 text-lg outline-none focus:border-purple"
onChange={(event) => setYearText(event.target.value)}
value={yearText}
/>
<div
id="year-error"
className="hidden text-xs text-red-400 mt-2"
>
Must be a valid date
</div>
</div>
</div>
{/* Line Arrow Container */}
<div className="container my-20 flex justify-center relative">
<hr className="border-light-grey w-full" />
<button
id="button"
className="absolute top-1/2 left-1/2 transform -translate-x-1/2 -translate-y-1/2 bg-purple w-16 h-16 rounded-full flex items-center justify-center hover:scale-125 transition-all"
type="submit"
onClick={() => callback(dayText, monthText, yearText)}
>
<img
src="/images/icon-arrow.svg"
alt="arrow"
className="w-6"
/>
</button>
</div>
</form>
);
}
export default TopForm;
Child 2(结果,显示从 TopForm 收集的数据)
function Results({ dayValue, monthValue, yearValue }) {
return (
// Results Container
<div id="results-container" className="container">
{/* Individual Container */}
<div className="container flex">
<span
id="results-year"
className="text-5xl italic font-bold text-purple mr-2"
>
{yearValue}
</span>
<p className="text-5xl italic font-bold mr-2">years</p>
</div>
<div className="container flex">
<span
id="results-month"
className="text-5xl italic font-bold text-purple mr-2"
>
{monthValue}
</span>
<p className="text-5xl italic font-bold mr-2">months</p>
</div>
<div className="container flex">
<span
id="results-day"
className="text-5xl italic font-bold text-purple mr-2"
>
{dayValue}
</span>
<p className="text-5xl italic font-bold mr-2">days</p>
</div>
</div>
);
}
export default Results;
我们可以通过追踪
callback
中使用 TopForm
属性的位置来查看问题的根源:
onClick={() => callback(dayText, monthText, yearText)}
将
callback
作为 callback={[setDayValue, setMonthValue, setYearValue]}
意味着 callback
是一个数组,因此您尝试将数组作为函数调用,这是不正确的。
相反,您可以单独调用数组的内部函数,例如:
onClick={() => {
callback[0](dayText)
callback[1](monthText)
callback[2](yearText)
}}
const { useState } = React;
function TopForm({ callback }) {
const [error, setError] = useState(false);
const [dayText, setDayText] = useState("");
const [monthText, setMonthText] = useState("");
const [yearText, setYearText] = useState("");
const handleSubmit = (event) => {
event.preventDefault();
setDayText("");
setMonthText("");
setYearText("");
};
return (
// Inputs Container
<form onSubmit={handleSubmit}>
{/* Upper Form */}
<div className="container flex justify-center gap-4 md:max-w-lg">
<div className="container w-1/3 flex flex-col">
<label
htmlFor="day"
className={`if ${error} ? "text-red-400 text-sm mb-1 uppercase tracking-wide" : "text-smokey-grey"`}
id="day-label"
>
Day
</label>
<input
type="number"
name="day"
id="day"
required
className="border-solid border-2 border-light-grey rounded-md p-3 text-lg outline-none focus:border-purple"
onChange={(event) => setDayText(event.target.value)}
value={dayText}
/>
<div id="day-error" className="hidden text-xs text-red-400 mt-2">
Must be a valid date
</div>
</div>
<div className="container w-1/3 flex flex-col">
<label
htmlFor="month"
id="month-label"
className="text-smokey-grey text-sm mb-1 uppercase tracking-wide"
>
Month
</label>
<input
type="number"
name="month"
id="month"
required
className="border-solid border-2 border-light-grey rounded-md p-3 text-lg outline-none focus:border-purple"
onChange={(event) => setMonthText(event.target.value)}
value={monthText}
/>
<div id="month-error" className="hidden text-xs text-red-400 mt-2">
Must be a valid date
</div>
</div>
<div className="container w-1/3 flex flex-col">
<label
htmlFor="year"
id="year-label"
className="text-smokey-grey text-sm mb-1 uppercase tracking-wide"
>
Year
</label>
<input
type="number"
name="year"
id="year"
required
className="border-solid border-2 border-light-grey rounded-md p-3 text-lg outline-none focus:border-purple"
onChange={(event) => setYearText(event.target.value)}
value={yearText}
/>
<div id="year-error" className="hidden text-xs text-red-400 mt-2">
Must be a valid date
</div>
</div>
</div>
{/* Line Arrow Container */}
<div className="container my-20 flex justify-center relative">
<hr className="border-light-grey w-full" />
<button
id="button"
className="absolute top-1/2 left-1/2 transform -translate-x-1/2 -translate-y-1/2 bg-purple w-16 h-16 rounded-full flex items-center justify-center hover:scale-125 transition-all"
type="submit"
onClick={() => {
callback[0](dayText)
callback[1](monthText)
callback[2](yearText)
}}
>
<img src="/images/icon-arrow.svg" alt="arrow" className="w-6" />
</button>
</div>
</form>
);
}
function Results({ dayValue, monthValue, yearValue }) {
return (
// Results Container
<div id="results-container" className="container">
{/* Individual Container */}
<div className="container flex">
<span
id="results-year"
className="text-5xl italic font-bold text-purple mr-2"
>
{yearValue}
</span>
<p className="text-5xl italic font-bold mr-2">years</p>
</div>
<div className="container flex">
<span
id="results-month"
className="text-5xl italic font-bold text-purple mr-2"
>
{monthValue}
</span>
<p className="text-5xl italic font-bold mr-2">months</p>
</div>
<div className="container flex">
<span
id="results-day"
className="text-5xl italic font-bold text-purple mr-2"
>
{dayValue}
</span>
<p className="text-5xl italic font-bold mr-2">days</p>
</div>
</div>
);
}
function Hero() {
const [dayValue, setDayValue] = useState("--");
const [monthValue, setMonthValue] = useState("--");
const [yearValue, setYearValue] = useState("--");
return (
<div className="font-poppins bg-light-grey p-2 h-screen w-screen">
{/* Main Container */}
<div className="container bg-white mt-16 max-w-[95%] md:max-w-2xl mx-auto p-10 rounded-xl rounded-br-3xl">
<TopForm
callback={[setDayValue, setMonthValue, setYearValue]}
/>
<Results
dayValue={dayValue}
monthValue={monthValue}
yearValue={yearValue}
/>
</div>
</div>
);
}
ReactDOM.createRoot(document.getElementById("app")).render(<Hero />);
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/18.2.0/umd/react.production.min.js" integrity="sha512-8Q6Y9XnTbOE+JNvjBQwJ2H8S+UV4uA6hiRykhdtIyDYZ2TprdNmWOUaKdGzOhyr4dCyk287OejbPvwl7lrfqrQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/18.2.0/umd/react-dom.production.min.js" integrity="sha512-MOCpqoRoisCTwJ8vQQiciZv0qcpROCidek3GTFS6KTk2+y7munJIlKCVkFCYY+p3ErYFXCjmFjnfTTRSC1OHWQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<div id="app"></div>
或者您可以将函数作为单独的 props 传递:
<TopForm
setDay={setDayValue}
setMonth={setMonthValue}
setYear={setYearValue}
/>
function TopForm({ setDay, setMonth, setYear }) {
// …
onClick={() => {
setDay(dayText)
setMonth(monthText)
setYear(yearText)
}}
// …
}
const { useState } = React;
function TopForm({ setDay, setMonth, setYear }) {
const [error, setError] = useState(false);
const [dayText, setDayText] = useState("");
const [monthText, setMonthText] = useState("");
const [yearText, setYearText] = useState("");
const handleSubmit = (event) => {
event.preventDefault();
setDayText("");
setMonthText("");
setYearText("");
};
return (
// Inputs Container
<form onSubmit={handleSubmit}>
{/* Upper Form */}
<div className="container flex justify-center gap-4 md:max-w-lg">
<div className="container w-1/3 flex flex-col">
<label
htmlFor="day"
className={`if ${error} ? "text-red-400 text-sm mb-1 uppercase tracking-wide" : "text-smokey-grey"`}
id="day-label"
>
Day
</label>
<input
type="number"
name="day"
id="day"
required
className="border-solid border-2 border-light-grey rounded-md p-3 text-lg outline-none focus:border-purple"
onChange={(event) => setDayText(event.target.value)}
value={dayText}
/>
<div id="day-error" className="hidden text-xs text-red-400 mt-2">
Must be a valid date
</div>
</div>
<div className="container w-1/3 flex flex-col">
<label
htmlFor="month"
id="month-label"
className="text-smokey-grey text-sm mb-1 uppercase tracking-wide"
>
Month
</label>
<input
type="number"
name="month"
id="month"
required
className="border-solid border-2 border-light-grey rounded-md p-3 text-lg outline-none focus:border-purple"
onChange={(event) => setMonthText(event.target.value)}
value={monthText}
/>
<div id="month-error" className="hidden text-xs text-red-400 mt-2">
Must be a valid date
</div>
</div>
<div className="container w-1/3 flex flex-col">
<label
htmlFor="year"
id="year-label"
className="text-smokey-grey text-sm mb-1 uppercase tracking-wide"
>
Year
</label>
<input
type="number"
name="year"
id="year"
required
className="border-solid border-2 border-light-grey rounded-md p-3 text-lg outline-none focus:border-purple"
onChange={(event) => setYearText(event.target.value)}
value={yearText}
/>
<div id="year-error" className="hidden text-xs text-red-400 mt-2">
Must be a valid date
</div>
</div>
</div>
{/* Line Arrow Container */}
<div className="container my-20 flex justify-center relative">
<hr className="border-light-grey w-full" />
<button
id="button"
className="absolute top-1/2 left-1/2 transform -translate-x-1/2 -translate-y-1/2 bg-purple w-16 h-16 rounded-full flex items-center justify-center hover:scale-125 transition-all"
type="submit"
onClick={() => {
setDay(dayText)
setMonth(monthText)
setYear(yearText)
}}
>
<img src="/images/icon-arrow.svg" alt="arrow" className="w-6" />
</button>
</div>
</form>
);
}
function Results({ dayValue, monthValue, yearValue }) {
return (
// Results Container
<div id="results-container" className="container">
{/* Individual Container */}
<div className="container flex">
<span
id="results-year"
className="text-5xl italic font-bold text-purple mr-2"
>
{yearValue}
</span>
<p className="text-5xl italic font-bold mr-2">years</p>
</div>
<div className="container flex">
<span
id="results-month"
className="text-5xl italic font-bold text-purple mr-2"
>
{monthValue}
</span>
<p className="text-5xl italic font-bold mr-2">months</p>
</div>
<div className="container flex">
<span
id="results-day"
className="text-5xl italic font-bold text-purple mr-2"
>
{dayValue}
</span>
<p className="text-5xl italic font-bold mr-2">days</p>
</div>
</div>
);
}
function Hero() {
const [dayValue, setDayValue] = useState("--");
const [monthValue, setMonthValue] = useState("--");
const [yearValue, setYearValue] = useState("--");
return (
<div className="font-poppins bg-light-grey p-2 h-screen w-screen">
{/* Main Container */}
<div className="container bg-white mt-16 max-w-[95%] md:max-w-2xl mx-auto p-10 rounded-xl rounded-br-3xl">
<TopForm
setDay={setDayValue}
setMonth={setMonthValue}
setYear={setYearValue}
/>
<Results
dayValue={dayValue}
monthValue={monthValue}
yearValue={yearValue}
/>
</div>
</div>
);
}
ReactDOM.createRoot(document.getElementById("app")).render(<Hero />);
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/18.2.0/umd/react.production.min.js" integrity="sha512-8Q6Y9XnTbOE+JNvjBQwJ2H8S+UV4uA6hiRykhdtIyDYZ2TprdNmWOUaKdGzOhyr4dCyk287OejbPvwl7lrfqrQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/18.2.0/umd/react-dom.production.min.js" integrity="sha512-MOCpqoRoisCTwJ8vQQiciZv0qcpROCidek3GTFS6KTk2+y7munJIlKCVkFCYY+p3ErYFXCjmFjnfTTRSC1OHWQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<div id="app"></div>