当我使用 value
更改它并使用 onChange
和 value
创建姓名和联系电话时,我想获得 setContacts
,此应用不会导致错误但不起作用,问题出在哪里?谢谢。
对象中的每个新联系人都有一个 id
、一个 name
和一个 phone number
const AddUSer = () => {
const {contacts, setcontacts}=useState([]);
const { userName, setUSerName } = useState("");
const { userPhone, setUserPhone } = useState("");
const setName = (e) => {
const value = e.target.value;
return setUSerName(value);
};
const setPhone = (e) => {
const value = e.target.value;
return setUserPhone(value);
};
const handleNewcontact = () => {
const allcontacts = [...contacts];
const newContact = {
id: Math.floor(Math.random() * 1000),
fullName: userName,
phone: userPhone,
};
allcontacts.push(newContact);
setcontacts(allcontacts);
setUSerName("");
setUserPhone("");
}
};
return (
<div className="container">
<form>
<label>Name</label>
<input className="form-control" onChange={(e) => setName} />
<label>Phone</label>
<input className="form-control" onChange={(e) => setPhone} />
<button
onClick={handleNewcontact}
className="btn btn-primary mt-3 mb-4"
>
Save
</button>
</form>
</div>
);
};
export default AddUSer;
答案 0 :(得分:1)
您没有将事件传递给函数。你可以这样做
onChange={(e) => setName(e)}
onChange={(e) => setPhone(e)}
但更好:
onChange={setName}
onChange={setPhone}
答案 1 :(得分:0)
试试这个。当用户单击提交按钮时,这些值会得到安慰。
const AddUSer = () => {
const [contact, setContact] = useState({id: '', userName:'', userPhone:''});
function handleNewContact(event) {
setContact({
...contact, id: Math.floor(Math.random() * 1000),
[event.target.name]: event.target.value
});
}
function handleSubmit(event) {
event.preventDefault();
console.log(contact);
}
return (
<div className="container">
<form>
<label>Name</label>
<input className="form-control" name='userName'
onChange={handleNewContact} />
<label>Phone</label>
<input className="form-control" name='userPhone'
onChange={handleNewContact} />
<button
onClick={handleSubmit}
className="btn btn-primary mt-3 mb-4"
>
Save
</button>
</form>
</div>
);
};
export default AddUSer;