Google Charts bar/column chart getColumnRange() unexpected value from DataView

Question

I'm trying to get the min and max value of a Dataview with the help of getColumnRange(). Unfortunately the values I get are not the ones I'd expect. Can someone advise me how I can get the correct values? The value I'd expect as max is 331M (the highest bar on the bar chart), but I get 8,5M. I tried to better my understanding of the DataView object with console.log(), however that didn't quite help me (line 65-71)

https://jsfiddle.net/zhp5rny6/3/

  var data = new google.visualization.DataTable({
cols: [
{id:"","label":"Products","pattern":"","type":"string"},
{id:"","label":"Manila","pattern":"","type":"number"},
{id:"","label":"Bangkok","pattern":"","type":"number"},
{id:"","label":"New York","pattern":"","type":"number"},
{id:"","label":"Sydney","pattern":"","type":"number"}],

rows:[
{c:[{v:"Glasses"},{v:-1270.7287},{v:-4486.0961},{v:-1019.4662},{v:3763827.8335}]},
{c:[{v:"Joysticks"},{v:145543.985},{v:2108039.5802},{v:266392.5277},{v:6006566.18690001}]},
{c:[{v:"Laptops"},{v:1723781.2686},{v:4435404.56789999},{v:7060065.3164},{v:17514581.1763}]},
{c:[{v:"PS4"},{v:78002243.0557997},{v:47591320.6768999},{v:43832560.9528002},{v:161580254.021496}]},
{c:[{v:"XBOX One"},{v:10507117.0145001},{v:8059953.41120002},{v:14103816.4604002},{v:34676509.4036004}]},
{c:[{v:"Smartphones"},{v:2373067.7893},{v:-53954.2187},{v:30783391.8722},{v:37288122.5537999}]},
{c:[{v:"Chairs"},{v:86583.2876},{v:71082.0195},{v:79813.2918},{v:22959813.0499999}]},
{c:[{v:"CPU"},{v:12479599.4709999},{v:22650137.9890997},{v:17562381.7794999},{v:25589299.8099997}]},
{c:[{v:"RAM"},{v:null},{v:-59.1},{v:282.7517},{v:1461239.6186}]},
{c:[{v:"Table"},{v:-566.5377},{v:-217.3444},{v:-865.114},{v:356870.886599999}]},
{c:[{v:"Water"},{v:870883.521900001},{v:1128581.9856},{v:1177332.008},{v:3922057.50240001}]}]
});

  var formatter = new google.visualization.NumberFormat({
    pattern: 'short'
  });

    for (var i = 1; i < data.getNumberOfColumns(); i++) {
    formatter.format(data, i);
    }

    var view = getDataView(data);

  function getDataView(dataTable) {
    var dataView;
    var viewColumns = [];

    for (var i = 0; i < dataTable.getNumberOfColumns(); i++) {
      addViewColumn(i);
    }

    function addViewColumn(index) {
        viewColumns.push(index);
        if(index == (dataTable.getNumberOfColumns() - 1)) {
            viewColumns.push({
            calc: function (dt, row) {
                for(var e = 0; e < dt.getNumberOfRows(); e++) {
                    var value = 0;
                    for(var u = 1; u < dt.getNumberOfColumns(); u++) {
                        value += dt.getValue(row, u);
                    }
                    return formatter.formatValue(value).toString();
                }
                },
            type: 'string',
            role: 'annotation',
            });
        }
    }

    dataView = new google.visualization.DataView(dataTable);
    dataView.setColumns(viewColumns);
    for(var z = 0; z < dataView.getNumberOfColumns(); z++) {
        console.log(JSON.stringify(dataView.getColumnRange(z)));
    }

    console.log(JSON.stringify(dataView.getViewColumns()));
    console.log(JSON.stringify(viewColumns));
    return dataView;
  }

Answer 1

the reason you get "8.5M" instead of "331M" is because the column type = 'string'

alphabetically, "8.5M" is greater than "331M"

to correct this issue, use a column type of 'number' .
when building the data view annotation column,
and return an object with both the value ( v: ) and formatted value ( f: ).

  viewColumns.push({
    calc: function (dt, row) {
      for(var e = 0; e < dt.getNumberOfRows(); e++) {
        var value = 0;
        for(var u = 1; u < dt.getNumberOfColumns(); u++) {
          value += dt.getValue(row, u);
        }
        return {  // <-- return object here
          v: value,
          f: formatter.formatValue(value)
        };
      }
      },
    type: 'number',  // <-- change to number
    role: 'annotation',
  });

see following working snippet...

 google.charts.load("44", {packages:['corechart']}); google.charts.setOnLoadCallback(drawChart); function drawChart() { var data = new google.visualization.DataTable({ cols: [ {id:"","label":"Products","pattern":"","type":"string"}, {id:"","label":"Manila","pattern":"","type":"number"}, {id:"","label":"Bangkok","pattern":"","type":"number"}, {id:"","label":"New York","pattern":"","type":"number"}, {id:"","label":"Sydney","pattern":"","type":"number"}], rows:[ {c:[{v:"Glasses"},{v:-1270.7287},{v:-4486.0961},{v:-1019.4662},{v:3763827.8335}]}, {c:[{v:"Joysticks"},{v:145543.985},{v:2108039.5802},{v:266392.5277},{v:6006566.18690001}]}, {c:[{v:"Laptops"},{v:1723781.2686},{v:4435404.56789999},{v:7060065.3164},{v:17514581.1763}]}, {c:[{v:"PS4"},{v:78002243.0557997},{v:47591320.6768999},{v:43832560.9528002},{v:161580254.021496}]}, {c:[{v:"XBOX One"},{v:10507117.0145001},{v:8059953.41120002},{v:14103816.4604002},{v:34676509.4036004}]}, {c:[{v:"Smartphones"},{v:2373067.7893},{v:-53954.2187},{v:30783391.8722},{v:37288122.5537999}]}, {c:[{v:"Chairs"},{v:86583.2876},{v:71082.0195},{v:79813.2918},{v:22959813.0499999}]}, {c:[{v:"CPU"},{v:12479599.4709999},{v:22650137.9890997},{v:17562381.7794999},{v:25589299.8099997}]}, {c:[{v:"RAM"},{v:null},{v:-59.1},{v:282.7517},{v:1461239.6186}]}, {c:[{v:"Table"},{v:-566.5377},{v:-217.3444},{v:-865.114},{v:356870.886599999}]}, {c:[{v:"Water"},{v:870883.521900001},{v:1128581.9856},{v:1177332.008},{v:3922057.50240001}]}] }); var formatter = new google.visualization.NumberFormat({ pattern: 'short' }); for (var i = 1; i < data.getNumberOfColumns(); i++) { formatter.format(data, i); } var view = getDataView(data); function getDataView(dataTable) { var dataView; var viewColumns = []; for (var i = 0; i < dataTable.getNumberOfColumns(); i++) { addViewColumn(i); } function addViewColumn(index) { viewColumns.push(index); if(index == (dataTable.getNumberOfColumns() - 1)) { viewColumns.push({ calc: function (dt, row) { for(var e = 0; e < dt.getNumberOfRows(); e++) { var value = 0; for(var u = 1; u < dt.getNumberOfColumns(); u++) { value += dt.getValue(row, u); } return { v: value, f: formatter.formatValue(value) }; } }, type: 'number', role: 'annotation', }); } } dataView = new google.visualization.DataView(dataTable); dataView.setColumns(viewColumns); for(var z = 0; z < dataView.getNumberOfColumns(); z++) { console.log(JSON.stringify(dataView.getColumnRange(z))); } console.log(JSON.stringify(dataView.getViewColumns())); console.log(JSON.stringify(viewColumns)); return dataView; } var options = { annotations: { alwaysOutside: true, textStyle: { fontSize: 10 } }, height: 400, isStacked: true }; var chart = new google.visualization.ColumnChart(document.getElementById("columnchart_values")); chart.draw(view, options); }

 <script src="https://www.gstatic.com/charts/loader.js"></script> <div id="columnchart_values"></div>