Method constructor

docs/app/js/sanddance-app.js:51745–51752

(props)

}
class DataSourcePicker extends _react.Component {
    constructor(props){
        super(props);
        this.state = {
            url: "",
            urlType: DataSourcePicker.urlTypes[0],
            working: false
        };
    }
    changeDataSource(dataSource) {
        this.setState({
            working: true