class Data {
    constructor() {
        // Set the id's of the HTML elements that contain each section of the user interface.
        this.chart1_id = 'chart';
        this.chart2_id = 'chart2';
        this.chart3_id = 'chart3';
        // Get and set into memory configuration and historical data from the server.
        this.trading_pair = bt_data.trading_pair;
        this.interval = bt_data.interval;
        this.price_history = fetch('http://localhost:5000/history').then((r) => r.json()).then( (data) => { return data; } );
        this.indicators = bt_data.indicators;
        // Request initialization data for the indicators.
        this.indicator_data = fetch('http://localhost:5000/indicator_init').then((r) => r.json()).then( (data) => { return data; } );
    }
    candle_update(){
        console.log('candle update');
    }

    candle_close(){
        console.log('candle close');
    }
}