blob: 28438751b99eab41141b0bd3f028e033a9bbb816 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
import { useState } from 'react'
const ShowPerson = (props) => {
const persons = props.persons
return (
<ol>
{persons.map( (person) => {
return (<li key={person.id}>{person.name}</li>)
} )}
</ol>
)
}
const App = () => {
const [persons, setPersons] = useState([
{ name: 'Arto Hellas' }
])
const [newName, setNewName] = useState('')
const addContact = (event) => {
event.preventDefault()
console.log(newName, persons)
if (persons.find(person => person.name === newName)) {
alert(`${newName} is already added to phonebook`)
} else {
const newPerson = {
name: newName,
id: persons.length + 1,
}
setPersons(persons.concat(newPerson))
}}
const handleTypedName = (event) => {
console.log(event.target.value)
setNewName(event.target.value)
console.log(newName)
}
return (
<div>
<h2>Phonebook</h2>
<form onSubmit={addContact}>
<div>
name: <input value={newName} onChange={handleTypedName} />
</div>
<div>
<button type="submit">add</button>
</div>
</form>
<h2>Numbers</h2>
<ShowPerson persons={persons}/>
</div>
)
}
export default App
|
