プレーンなReactのForm サンプル
ScrimbaのReactコースより
text
textarea
checkbox
radio button
select
code:js
import React from "react"
export default function Form() {
{
firstName: "",
lastName: "",
email: "",
comments: "",
isFriendly: true,
employment: "",
favColor: ""
}
)
function handleChange(event) {
const {name, value, type, checked} = event.target
setFormData(prevFormData => {
return {
...prevFormData,
name: type === "checkbox" ? checked : value }
})
}
function handleSubmit(event) {
event.preventDefault()
submitToApi(formData)
}
return (
<form onSubmit={handleSubmit}>
<input
type="text"
placeholder="First Name"
onChange={handleChange}
name="firstName"
value={formData.firstName}
/>
<input
type="text"
placeholder="Last Name"
onChange={handleChange}
name="lastName"
value={formData.lastName}
/>
<input
type="email"
placeholder="Email"
onChange={handleChange}
name="email"
value={formData.email}
/>
<textarea
value={formData.comments}
placeholder="Comments"
onChange={handleChange}
name="comments"
/>
<input
type="checkbox"
id="isFriendly"
checked={formData.isFriendly}
onChange={handleChange}
name="isFriendly"
/>
<label htmlFor="isFriendly">Are you friendly?</label>
<br />
<br />
<fieldset>
<legend>Current employment status</legend>
<input
type="radio"
id="unemployed"
name="employment"
value="unemployed"
checked={formData.employment === "unemployed"}
onChange={handleChange}
/>
<label htmlFor="unemployed">Unemployed</label>
<br />
<input
type="radio"
id="part-time"
name="employment"
value="part-time"
checked={formData.employment === "part-time"}
onChange={handleChange}
/>
<label htmlFor="part-time">Part-time</label>
<br />
<input
type="radio"
id="full-time"
name="employment"
value="full-time"
checked={formData.employment === "full-time"}
onChange={handleChange}
/>
<label htmlFor="full-time">Full-time</label>
<br />
</fieldset>
<br />
<label htmlFor="favColor">What is your favorite color?</label>
<br />
<select
id="favColor"
value={formData.favColor}
onChange={handleChange}
name="favColor"
<option value="red">Red</option>
<option value="orange">Orange</option>
<option value="yellow">Yellow</option>
<option value="green">Green</option>
<option value="blue">Blue</option>
<option value="indigo">Indigo</option>
<option value="violet">Violet</option>
</select>
<br />
<br />
<button>Submit</button>
</form>
)
}
formタグ内にbuttonタグを書くと、自動で
<button type="submit">Submit</button>
になる。だから<button>Submit</button>と省略して書ける。