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Google visualization highlights one grid line

how can i select one grid line? I would like to set the optical temperature limit at 35 ° C.

enter image description here

Thank! Now I added it to my code, but it doesn't work ... do you see my error? Or am I missing something in your explanations? Here's the edited version:

  //Google Chart
   google.charts.load('current', {
   callback: function drawChart(peanut) {
     const div = document.createElement('div');
     div.id = peanut.color + peanut.mac.split(':').join('');
     $('#charts').appendChild(div);
     peanut.data = new google.visualization.DataTable();
     peanut.data.addColumn('datetime', 'Time');
     peanut.data.addColumn('number', '🥜 ' + peanut.label);
     for (var i = 0, len = localStorage.length; i < len; i++) {
       let dateTime = new Date(parseInt(localStorage.key(i)));
       let item = JSON.parse(localStorage.getItem(localStorage.key(i)));
       if (item.peanutMac === peanut.mac) {
         if (item.temperatureCelsius) {
           let temperature = parseFloat(item.temperatureCelsius);
           peanut.data.addRows([ [dateTime, temperature] ]);
         } else if (item.alert) {
           let data = parseInt(item.alert);
           peanut.data.addRows([ [dateTime, data] ]);
         }
       }
     }
     if (peanut.type == 'thermo') {
     peanut.chart = new google.visualization.LineChart($('#' + div.id));

       peanut.chartOptions = {
         interpolateNulls: true,
         fontName: 'Roboto',
         curveType: 'function',
         colors: [peanut.rgbColor],
         width: document.body.clientWidth,
         height: (window.innerHeight - 224) / 2,
         legend: 'none',
          lineWidth: 3,
          vAxis: { 
            format: '#.## °C',
            ticks: [15.00, 20.00, 25.00, 30.00, 35.00, 40.00]
          },
          hAxis: {
            gridlines: { 
             color: '#fff'
           }
         }
       };

      peanut.viewColumns = [];
      $.each(new Array(data.getNumberOfColumns()), function (colIndex) {
      peanut.viewColumns.push(colIndex);
      });
      peanut.viewColumns.push({
      calc: function () {
       return 35;
       },
           label: 'optical temperature limit',
           type: 'number'
       });
     } 

    peanut.view = new google.visualiation.DataView(data);
    peanut.view.setColumns(viewColumns);

     if (peanut.data.getNumberOfRows()) {
       peanut.chart.draw(peanut.view, peanut.chartOptions);
     }
   }
     packages:['corechart', 'table']
 });
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3 answers


add another series with value set to 35

for all lines

the data view is used here to add a calculation column for the optical temperature limit



google.charts.load('current', {
  callback: function () {
    var data = new google.visualization.DataTable();
    data.addColumn('number', 'x');
    data.addColumn('number', 'y0');
    data.addColumn('number', 'y1');
    data.addColumn('number', 'y2');
    data.addRows([
      [1,  32.8, 20.8, 21.8],
      [2,  30.9, 29.5, 32.4],
      [3,  25.4,   27, 25.7],
      [4,  21.7, 28.8, 20.5],
      [5,  21.9, 27.6, 20.4]
    ]);

    var options = {
      interpolateNulls: true,
      fontName: 'Roboto',
      curveType: 'function',
      legend: 'none',
      lineWidth: 3,
      vAxis: {
        format: '#.## °C',
        ticks: [20.00, 25.00, 30.00, 35.00, 40.00]
      },
      hAxis: {
        gridlines: {
          color: '#fff'
        }
      }
    };

    var viewColumns = [];
    $.each(new Array(data.getNumberOfColumns()), function (colIndex) {
      viewColumns.push(colIndex);
    });

    viewColumns.push({
      calc: function () {
        return 35;
      },
      label: 'optical temperature limit',
      type: 'number'
    });

    var view = new google.visualization.DataView(data);
    view.setColumns(viewColumns);

    var chart = new google.visualization.LineChart($('#chart').get(0));
    chart.draw(view, options);
  },
  packages:['corechart', 'table']
});
      

        
        
        
      

    
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart"></div>
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This is not the best and safest way, but I didn't find something in google documentation:

You can use JQuery for it. I tried this with an example from google docs and it works click



var line = $("svg g line")[4]
$(line).attr('stroke','red');
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0


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An easy way is to set the vAxis baseline to the desired value, say 35, and change the base color. However, there is no way to change the width of that line, so if you need it, you should follow the suggestion above to add a draw-only series for that line and set its line width.

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