let isOffline = true;

​

function initOnReady() {

  class TestDatafeed extends Datafeeds.UDFCompatibleDatafeed {

    resolveSymbol(symbolName, onResolve, onError, extension) {

      console.log({ symbolName });

      if (isOffline) {

        setTimeout(() => {

          onError('Currently Offline')

        },0);

        return;

      }

      let actualSymbolName = symbolName;

      if (actualSymbolName.includes('_reload')) {

        actualSymbolName = actualSymbolName.replace(/_reload\d*/, '');

        console.log({ actualSymbolName });

      }

      super.resolveSymbol(actualSymbolName, onResolve, onError, extension)

    }

    getBars(symbolInfo, resolution, periodParams, onResult, onError) {

      if (isOffline) {

        setTimeout(() => {

          onError('Currently Offline')

        },0);

        return;

      }

      super.getBars(symbolInfo, resolution, periodParams, onResult, onError);

    }

  }

  var widget = (window.tvWidget = new TradingView.widget({

    library_path:

      "https://charting-library.tradingview-widget.com/charting_library/",

    // debug: true, // uncomment this line to see Library errors and warnings in the console

    fullscreen: true,

    symbol: "AAPL",

    interval: "1D",

    container: "tv_chart_container",

    datafeed: new TestDatafeed(

      "https://demo-feed-data.tradingview.com"

    ),

    locale: "en",

    disabled_features: [],

    enabled_features: [],

  }));

  setTimeout(() => {

    console.log('Put back online');

    isOffline = false;

    widget.activeChart().resetData();

    // if the symbol info or no data was ever loaded

    // then you can reset everything by switching the symbol

    const currentSymbol = widget.activeChart().symbol();

    widget.activeChart().setSymbol(currentSymbol + '_reload' + Math.round(Math.random() * 1000));

  }, 5000);

}

​

window.addEventListener("DOMContentLoaded", initOnReady, false);

​