How get data from material-ui TextField, DropDownMenu components?

Question

I create form, I have several TextField, DropDownMenu material-ui components included, question is how I can collect all data from all TextFields, DropDownMenus in one obj and s

Answer 1

class Content extends React.Component {
    render() {
        return (
             this.input = input} />
        );
    }

    _doSomethingWithData() {
        let inputValue =  this.input.getValue();
    }
}