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我正在使用 Google 可视化 API 条形图。我需要能够使用以下代码做一些事情：

  1. 在底部显示百分比。如果总共有 213 个，则 81 应该显示 38%

http://jsfiddle.net/wesbos/EQ4kc/

  google.load("visualization", "1", {packages:["corechart"]});
  google.setOnLoadCallback(drawChart);
  function drawChart() {
    var data = google.visualization.arrayToDataTable([
        ["dummy","Question 1", "Question 2", " Question 3"],
        [0,81, 122, 10 ]
    ]);

    var options = {
      title: '',
      vAxis: {
        title: '',
        gridlines : {
          count : 5,
          color: 'white'
        }
      },
      hAxis: {
        title: '',
        format : '#%',
        gridlines : {
          count : 5,
          color: 'white'
        }
      },
      colors: ['#be1e2d', '#74b749', '#0daed3', '#ffb400', '#f63131'],
      legend : {
        position: 'bottom'
      }
    };

    var chart = new google.visualization.BarChart(document.getElementById('chart_div'));
    chart.draw(data, options);
4

1 回答 1

6

为此，您必须将数据转换为百分比。您可以使用 DataView 来处理此问题：

var view = new google.visualization.DataView(data);
view.setColumns([0, {
    type: 'number',
    label: data.getColumnLabel(1),
    calc: function (dt, row) {
        var val = dt.getValue(row, 1);
        for (var i = 1, total = 0, cols = dt.getNumberOfColumns(); i < cols; i++) {
            total += dt.getValue(row, i);
        }
        var percent = val / total;
        // what you do here depends on how you want to display the data in the tooltips

        // option 1: use the value of the data point:
        return {v: percent, f: dt.getFormattedValue(row, 1)};


        // option 2: use the percent:
        return {v: percent, f: (percent * 100).toFixed(2) + '%'};
    }
}, {
    type: 'number',
    label: data.getColumnLabel(2),
    calc: function (dt, row) {
        var val = dt.getValue(row, 2);
        for (var i = 1, total = 0, cols = dt.getNumberOfColumns(); i < cols; i++) {
            total += dt.getValue(row, i);
        }
        var percent = val / total;
        // what you do here depends on how you want to display the data in the tooltips

        // option 1: use the value of the data point:
        return {v: percent, f: dt.getFormattedValue(row, 2)};


        // option 2: use the percent:
        return {v: percent, f: (percent * 100).toFixed(2) + '%'};
    }
}, {
    type: 'number',
    label: data.getColumnLabel(3),
    calc: function (dt, row) {
        var val = dt.getValue(row, 3);
        for (var i = 1, total = 0, cols = dt.getNumberOfColumns(); i < cols; i++) {
            total += dt.getValue(row, i);
        }
        var percent = val / total;
        // what you do here depends on how you want to display the data in the tooltips

        // option 1: use the value of the data point:
        return {v: percent, f: dt.getFormattedValue(row, 3)};


        // option 2: use the percent:
        return {v: percent, f: (percent * 100).toFixed(2) + '%'};
    }
}]);

然后用视图而不是数据绘制图表：

chart.draw(view, options);
于 2013-09-19T17:47:40.047 回答