reactintro/14.state.spread.html at master · linyutg/reactintro · GitHub

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
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
<!DOCTYPE html>
<html>
  <head>
    <title>state</title>
    <meta charset="utf-8" />
    <style>
      body {
        font-family: -apple-system, sans-serif;
      }
    </style>
  </head>
  <body>
    <div id="app"></div>
    <script src="react/react.js"></script>
    <script src="react/react-dom.js"></script>
    <script src="react/babel.js"></script>
    <script type="text/babel"></script>
  </body>
  <script type="text/babel">
    const { useState } = React;

    function Form() {
      const [person, setPerson] = useState({
        firstName: "Barbara",
        lastName: "Hepworth",
        email: "bhepworth@sculpture.com",
      });

      function handleFirstNameChange(e) {
        setPerson({
          ...person,
          firstName: e.target.value,
        });
      }

      function handleLastNameChange(e) {
        setPerson({
          ...person,
          lastName: e.target.value,
        });
      }

      function handleEmailChange(e) {
        setPerson({
          ...person,
          email: e.target.value,
        });
      }

      return (
        <div>
          <label>
            First name:
            <input value={person.firstName} onChange={handleFirstNameChange} />
          </label>
          <label>
            Last name:
            <input value={person.lastName} onChange={handleLastNameChange} />
          </label>
          <label>
            Email:
            <input value={person.email} onChange={handleEmailChange} />
          </label>
          <p>
            {person.firstName} {person.lastName} ({person.email})
          </p>
        </div>
      );
    }

    ReactDOM.render(<Form />, document.getElementById("app"));
  </script>
</html>