Qt Quick Demo - StocQt | Qt 5.15

- Qt 5.15
- Qt Quick Demo - StocQt
- Qt 5.15.17 Reference Documentation

# Qt Quick Demo - StocQt

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     ** This file is part of the examples of the Qt Toolkit.
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     import QtQuick 2.0

     ListModel {
         id: stocks

         // pre-fetch data for all entries
         Component.onCompleted: {
             for (var idx = 0; idx < count; ++idx) {
                 getCloseValue(idx)
             }
         }

         function getCloseValue(index) {

             var endDate = new Date(); // today
             var startDate = new Date();
             endDate.setDate(startDate.getDate() - 1);
             startDate.setDate(endDate.getDate() - 7);

             var req = "data/" + get(index).stockId + ".csv"

             var xhr = new XMLHttpRequest;

             xhr.open("GET", req, true);

             xhr.onreadystatechange = function() {
                 if (xhr.readyState === XMLHttpRequest.LOADING || xhr.readyState === XMLHttpRequest.DONE) {
                     var records = xhr.responseText.split('\n');
                     var unknown = "n/a";
                     set(index, {"value": unknown, "change": unknown, "changePercentage": unknown});
                     if (records.length > 0 && xhr.status == 200) {
                         var r = records[1].split(',');
                         var today = parseFloat(r[4]);

                         if (!isNaN(today))
                             setProperty(index, "value", today.toFixed(2));
                         if (records.length > 2) {
                             r = records[2].split(',');
                             var yesterday = parseFloat(r[4]);
                             var change = today - yesterday;

                             if (change >= 0.0)
                                 setProperty(index, "change", "+" + change.toFixed(2));
                             else
                                 setProperty(index, "change", change.toFixed(2));

                             var changePercentage = (change / yesterday) * 100.0;
                             if (changePercentage >= 0.0)
                                 setProperty(index, "changePercentage", "+" + changePercentage.toFixed(2) + "%");
                             else
                                 setProperty(index, "changePercentage", changePercentage.toFixed(2) + "%");
                         }
                     }
                 }
             }
             xhr.send()
         }
         // Uncomment to test invalid entries
         // ListElement {name: "The Qt Company"; stockId: "TQTC"; value: "999.0"; change: "0.0"; changePercentage: "0.0"}

         // Offline data downloaded using the url, https://www.quandl.com/api/v3/datasets/WIKI/<stockId>.csv.
         ListElement {name: "Advanced Micro Devices Inc."; stockId: "AMD"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "Amazon.com Inc."; stockId: "AMZN"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "Apple Inc."; stockId: "AAPL"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "Autodesk Inc."; stockId: "ADSK"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "Cisco Systems Inc."; stockId: "CSCO"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "eBay Inc."; stockId: "EBAY"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "Electronic Arts Inc."; stockId: "EA"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "Intel Corp."; stockId: "INTC"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "Microsoft Corp."; stockId: "MSFT"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "NetApp Inc."; stockId: "NTAP"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "Netflix Inc."; stockId: "NFLX"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "Norwegian Cruise Line Holdings Ltd."; stockId: "NCLH"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "NVIDIA Corp."; stockId: "NVDA"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "PayPal Holdings Inc."; stockId: "PYPL"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "QUALCOMM Inc."; stockId: "QCOM"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "Tesla Motors Inc."; stockId: "TSLA"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "Texas Instruments Inc."; stockId: "TXN"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
         ListElement {name: "Facebook Inc."; stockId: "FB"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
     }