如何检查交易视图是否支持所请求的货币对

Question

我目前正在尝试实现交易​​视图嵌入式图表功能。

问题是需要比交易视图支持更多对的网站，因此这对'BTCUSD'显示图表并且工作得很好，但是不太流行的加密货币对（例如'MDTUSD'）返回的图表内部没有数据。 / p>

有没有一种方法可以检查该配对是否受支持？

交易视图嵌入代码

            <!-- TradingView Widget BEGIN -->
            <div class="tradingview-widget-container">
                <div id="tradingview_a9055"></div>
                <div class="tradingview-widget-copyright"><a href="https://www.tradingview.com/symbols/BTCUSD/" rel="noopener" target="_blank"><span class="blue-text">AAPL chart</span></a> by TradingView</div>
                <script type="text/javascript" src="https://s3.tradingview.com/tv.js"></script>
                <script type="text/javascript">
                  new TradingView.widget(
                          {
                              "width": 1000,
                              "height": 500,
                              "symbol": "BTCUSD",
                              "interval": "D",
                              "timezone": "Etc/UTC",
                              "theme": "Light",
                              "style": "1",
                              "locale": "en",
                              "toolbar_bg": "#f1f3f6",
                              "enable_publishing": true,
                              "withdateranges": true,
                              "hide_side_toolbar": false,
                              "save_image": false,
                              "studies": [
                                  "MASimple@tv-basicstudies"
                              ],
                              "container_id": "tradingview_a9055"
                          }
                  );
                </script>
            </div>
            <!-- TradingView Widget END -->

认为我可以做这样的事情

<script type="text/javascript">
    if (new TradingView.widget(
            {
                "width": 1000,
                "height": 500,
                "symbol": "MDTUSD",
                "interval": "D",
                "timezone": "Etc/UTC",
                "theme": "Light",
                "style": "1",
                "locale": "en",
                "toolbar_bg": "#f1f3f6",
                "enable_publishing": true,
                "withdateranges": true,
                "hide_side_toolbar": false,
                "save_image": false,
                "studies": [
                    "MASimple@tv-basicstudies"
                ],
                "container_id": "tradingview_a9055"
            }
    )) {
        new TradingView.widget(
                {
                    "width": 1000,
                    "height": 500,
                    "symbol": "MDTUSD",
                    "interval": "D",
                    "timezone": "Etc/UTC",
                    "theme": "Light",
                    "style": "1",
                    "locale": "en",
                    "toolbar_bg": "#f1f3f6",
                    "enable_publishing": true,
                    "withdateranges": true,
                    "hide_side_toolbar": false,
                    "save_image": false,
                    "studies": [
                        "MASimple@tv-basicstudies"
                    ],
                    "container_id": "tradingview_a9055"
                }
        );
    } else {
        alert("NO CHART");
    }
</script>