質問編集履歴
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見つけましたコードを追加しました。
test
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File without changes
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test
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@@ -131,3 +131,75 @@
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export default Calc;
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```
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135
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```ここに言語を入力
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136
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137
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class Layer extends React.Component {
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constructor(props) {
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super(props);
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this.state = {value: 'coconut'};
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this.handleChange = this.handleChange.bind(this);
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this.handleSubmit = this.handleSubmit.bind(this);
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}
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handleChange(event) {
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this.setState({value: event.target.value});
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}
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handleSubmit(event) {
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alert('Your favorite flavor is: ' + this.state.value);
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event.preventDefault();
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}
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render() {
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return (
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<form onSubmit={this.handleSubmit}>
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<label>
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Choose how many times you want to paint:
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<select value={this.state.value} onChange={this.handleChange}>
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<option value="grapefruit">1</option>
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<option value="lime">2</option>
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<option value="coconut">3t</option>
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</select>
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</label>
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<input type="submit" value="Submit" />
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</form>
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);
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}
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}
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```
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