[英]Submit a form with data using a custom React hook
我很难弄清楚这一点。 我想创建一个称为使用 fetch 提交表单的钩子。
这就是我现在所拥有的。 持有表单的组件:
const MyForm = (): ReactElement => {
const [status, data] = useSubmitForm('https://myurl-me/', someData);
return <>
<div className='Feedback-form'>
<div className='body'>
<form>
<input type='text' name='username' placeholder='name' required />
<input type='email' name='email' placeholder='email' required />
<button className='submit-feedback-button' type='button'>Send feedback</button>
</form>
</div>
</div>
</>
}
自定义钩子:
import { useState, useEffect } from 'react';
const useSubmitForm = (url: string, data: URLSearchParams): [string, []] => {
const [status, setStatus] = useState<string>('idle');
const [responseData, setData] = useState<[]>([]);
useEffect(() => {
if (!url) return;
const fetchData = async () => {
setStatus('fetching');
const response = await fetch(url, {
method: 'POST',
headers: {
'Accept': 'text/html',
'Content-Type': 'application/x-www-form-urlencoded'
},
body: data
});
const data = await response.json();
setData(data);
setStatus('fetched');
};
fetchData();
}, [url]);
return [status, responseData];
};
export default useSubmitForm;
我的问题是我认为这个钩子正在被立即调用。 如何制作这个钩子并以仅在提交表单并且我需要在请求正文中发送的所有数据都包含在内的方式调用它?
你是对的,当组件安装时效果会运行一次,并且由于url
是真实的,它会跳过早期返回并调用fetchData
。
如何制作这个钩子并以仅在提交表单并且我需要在请求正文中发送的所有数据都包含在内的方式调用它?
您还需要返回 function 以供组件调用并传递表单字段值。 我认为你有几个基本的选择。
useSubmitForm
挂钩返回的“获取”function。useSubmitForm
返回一个onSubmit
处理程序以附加到您的form
元素。 onSubmit
处理程序需要知道从onSubmit
事件访问哪些字段,因此将字段名称数组传递给钩子(即“配置”)是有意义的。 从useEffect
挂钩中fetchData
function 并向其添加表单字段数据参数。 由于fetch
和response.json()
都可以抛出错误/拒绝,你应该在 try/catch 中包围这个块。 返回自定义fetchData
function 以供表单调用。
使用提交表单
const useSubmitForm = (
url: string,
data: URLSearchParams
): [function, string, []] => {
const [status, setStatus] = useState<string>("idle");
const [responseData, setData] = useState<[]>([]);
const fetchData = async (formData) => {
setStatus("fetching");
try {
const response = await fetch(url, {
method: "POST",
headers: {
Accept: "text/html",
"Content-Type": "application/x-www-form-urlencoded"
},
body: JSON.stringify(formData)
});
const data = await response.json();
setData(data);
setStatus("fetched");
} catch (err) {
setData(err);
setStatus("failed");
}
};
return [fetchData, status, responseData];
};
我的表格
const MyForm = (): ReactElement => {
const [fields, setFields] = useState({ // <-- create field state
email: '',
username: '',
});
const [fetchData, status, data] = useSubmitForm(
"https://myurl-me/",
someData
);
useEffect(() => {
// handle successful/failed fetch status and data/error
}, [status, data]);
const changeHandler = (e) => {
const { name, value } = e.target;
setFields((fields) => ({
...fields,
[name]: value
}));
};
const submitHandler = (e) => {
e.preventDefault();
fetchData(fields); // <-- invoke hook fetchData function
};
return (
<div className="Feedback-form">
<div className="body">
<form onSubmit={submitHandler}> // <-- attach submit handler
<input
type="text"
name="username"
placeholder="name"
onChange={changeHandler} // <-- attach change handler
value={fields.username} // <-- pass state
/>
<input
type="email"
name="email"
placeholder="email"
onChange={changeHandler} // <-- attach change handler
value={fields.email} // <-- attach state
/>
<button className="submit-feedback-button" type="submit">
Send feedback
</button>
</form>
</div>
</div>
);
};
onSubmit
处理程序并将一个字段数组传递给useSubmitForm
使用提交表单
const useSubmitForm = (
url: string,
data: URLSearchParams,
fields: string[],
): [function, string, []] => {
const [status, setStatus] = useState<string>("idle");
const [responseData, setData] = useState<[]>([]);
const fetchData = async (formData) => {
setStatus("fetching");
try {
const response = await fetch(url, {
method: "POST",
headers: {
Accept: "text/html",
"Content-Type": "application/x-www-form-urlencoded"
},
body: JSON.stringify(formData)
});
const data = await response.json();
setData(data);
setStatus("fetched");
} catch (err) {
setData(err);
setStatus("failed");
}
};
const onSubmit = e => {
e.preventDefault();
const formData = fields.reduce((formData, field) => ({
...formData,
[field]: e.target[field].value,
}), {});
fetchData(formData);
}
return [onSubmit, status, responseData];
};
我的表格
const MyForm = (): ReactElement => {
const [onSubmit, status, data] = useSubmitForm(
"https://myurl-me/",
someData,
['email', 'username'] // <-- pass field array
);
useEffect(() => {
// handle successful/failed fetch status and data/error
}, [status, data]);
return (
<div className="Feedback-form">
<div className="body">
<form onSubmit={onSubmit}> // <-- attach submit handler
<input
type="text"
name="username"
placeholder="name"
/>
<input
type="email"
name="email"
placeholder="email"
/>
<button className="submit-feedback-button" type="submit">
Send feedback
</button>
</form>
</div>
</div>
);
};
在我看来,第二种解决方案是更清洁的解决方案,并且需要更少的消耗组件来使用。
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