[visualization-api] Google line chart - lines don´t show on ios devices

[Marco812]

Hi,

i have a google line chart wich display fine in alle desktop browsers. On 
iOS mobile devices, the lines are missing.

<script type="text/javascript">

                    setInterval(drawChart, 1000);
                    google.charts.load('current', {packages: ['corechart']})

                                       function drawChart() {
                        $.ajax({
                            url: url,
                            dataType: "json",
                            success: function (jsonData) {

                                var data = new 
google.visualization.DataTable();

                                data.addColumn('datetime', 'time');
                                data.addColumn('number', 
'Temperatur_Unten');
                                data.addColumn('number', 'Temperatur_Oben');

                                                               for (var i = 
0; i < jsonData.length; i++) {

                                    data.addRow([new 
Date(jsonData[i].time), parseFloat(jsonData[i].Temperatur_Oben), 
parseFloat(jsonData[i].Temperatur_Unten)]);
                                    console.log(jsonData[i].time);
                                    
                                }    
                              
                                var options = {
                                    'vAxis': {'title': 'Something Here',
                                    'minValue': 0, 
                                    'maxValue': 100},
                                                                        
 legend: { position: 'bottom' }

                                };

                                var chart = new 
google.visualization.LineChart(document.getElementById('temparature_div'));
                                chart.draw(data, options);

                                                      }
                        });
                    }

                    google.charts.setOnLoadCallback(drawChart);

                    </script>
                    <div id="temparature_div" style="width: 100%; height: 
400px;"></div>

 {
    "sample_id": 199,
    "time": "2019-09-09 16:02:59",
    "Temperatur_Unten": 22.57,
    "Temperatur_Oben": 22.35
  },
  {
    "sample_id": 198,
    "time": "2019-09-09 16:02:57",
    "Temperatur_Unten": 22.57,
    "Temperatur_Oben": 22.35
  },
  {
    "sample_id": 197,
    "time": "2019-09-09 16:02:55",
    "Temperatur_Unten": 22.57,
    "Temperatur_Oben": 22.36
  },



Any ideas?

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