Extract tradingview data with tampermonkey script

tampermonkey_extract_tradingview_data

// ==UserScript==
// @name         Extract TradingView Databox on keypress
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://www.tradingview.com/chart/IQRwR53e/?symbol=USI%3APCC
// @icon         https://www.google.com/s2/favicons?domain=tradingview.com
// @grant        none
// @run-at       document-end
// ==/UserScript==

//
// README
//
// WTF is this for? 
// It is for capturing small amount of data from tradingview charts. This capture method is relatively slow.
// This souliton is good for testing market data, before purchasing it from your market data provider. etc.
//
// 1. Install tampermonkey extension import this script, edit target URL for "@match" in the header of this file
// 2. Open tradingview chart, open Data Window on the right side
// 3. Press F12, enter devtools, check out console tab for script output 
// 4. Press the RIGHTARROW button on your keyboard, it will scroll the chart 1 bar to the right. 
//    Do not move your cursor while extracting the data.
// 5. When you are ready with your capture, press ALT + Q to print data to your console
//    To reset array "d" reload your browser tab (F5)
// 6. Edit the script to your liking.
//
//

(function() {
    'use strict';

    var d = [];
    var lastTime = '';

    function onRightArrow() {
        let chartDataWindow = document.getElementsByClassName('chart-data-window-body');
        //console.log(chartDataWindow);

        let date = (chartDataWindow[0].childNodes[0].childNodes[1].childNodes[0].childNodes[0].textContent).split('-').join('');
        let time = (chartDataWindow[0].childNodes[1].childNodes[1].childNodes[0].childNodes[0].textContent).split(':').join('');
        let open = chartDataWindow[1].childNodes[0].childNodes[1].childNodes[0].childNodes[0].textContent;
        let high = chartDataWindow[1].childNodes[1].childNodes[1].childNodes[0].childNodes[0].textContent;
        let low = chartDataWindow[1].childNodes[2].childNodes[1].childNodes[0].childNodes[0].textContent;
        let close = chartDataWindow[1].childNodes[3].childNodes[1].childNodes[0].childNodes[0].textContent;

        //console.log(date);
        //console.log(time);
        //console.log(open);
        //console.log(high);
        //console.log(low);
        //console.log(close);

        // Ninjatrader format: https://ninjatrader.com/support/helpGuides/nt8/NT%20HelpGuide%20English.html?importing.htm
        // yyyyMMdd HHmmss;open price;high price;low price;close price;volume

        if (lastTime != time) {
            let item = `${date} ${time}00;${open};${high};${low};${close};1`;
            d.push(item);
            lastTime = time;
        }

        console.log(`${date} ${time} ${close}`);

    }

    function printData() {
        console.log(d.join('\r\n'));
    }

    function onKeydown(evt) {
        // Use https://keycode.info/ to get keys

        // RightArrow
        if (evt.keyCode == 39) {
            onRightArrow();
        }
        // alt + q
        if (evt.altKey && evt.keyCode == 81) {
            printData();
        }
    }
    document.addEventListener('keydown', onKeydown, true);

})();