react-railsのバージョンは2.4.7 対応するReact.jsのバージョンは16.4.2
https://github.com/reactjs/react-rails/blob/master/VERSIONS.md#bundled-versions
reference: https://qiita.com/joe-re/items/96f12dda4a62470d1d7c
- v16かららしい
- 行き当たりばったりで解決
// BEFORE
handleSubmit(e){
e.preventDefault();
var title = ReactDOM.findDOMNode(this.refs.title).value;
// ...
return;
},
render(){
return (
<form className="commentForm" onSubmit={this.handleSubmit}>
<input type="text" placeholder="Title" ref="title" />
</form>
)
}
// ...
// AFTER
handleSubmit(e){
e.preventDefault();
var title = this.title.value.trim();
// ...
return;
},
render(){
return (
<form className="commentForm" onSubmit={this.handleSubmit}>
<input type="text" placeholder="Title" ref={(inputText) => { this.title = inputText; }} />
</form>
)
}
// ...
// BEFORE
render: function() { // <=ここ
return (
<div className="commentBox">
Hello, world! I am a CommentBox.
</div>
);
}
// AFTER
render() { // <=ここ
return (
<div className="commentBox">
Hello, world! I am a CommentBox.
</div>
);
}