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javascript – Google条形图无法更改单个条形图颜色

2019-09-17 05:36:37 作者：互联网

我使用Google Visualization API创建了一个谷歌条形图,我正在尝试添加一个用于样式的列.下面是我的实现,使用.addcolumn(),然后将颜色字段添加到每一行,但每个条仍然是默认的蓝色.

<script type="text/javascript">
// Runs onl oad to build the first default chart and load the bar chart package
var jsonCoachCount;
window.onload = function(){
    jsonCoachCount = JSON.parse('[{"Service_Count":"4","Name":"Other"},  {"Service_Count":"4","Name":"Campus Network"},{"Service_Count":"3","Name":"Learn@UW"},{"Service_Count":"2","Name":"Customer Service"},{"Service_Count":"1","Name":"Blackboard Collaborate"},{"Service_Count":"1","Name":"Office 365"},{"Service_Count":"1","Name":"Multiple"},{"Service_Count":"1","Name":"Office-ionado"},{"Service_Count":"1","Name":"Case Notes"},{"Service_Count":"1","Name":"ResNet"}]');

// Load the Visualization API and the barchart package.
    google.charts.load('current', {'packages': ['bar']});
// Set a callback to run when the Google Visualization API is loaded.
    google.charts.setOnLoadCallback(drawChart);

};
function drawChart(){

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

    servicesData.addColumn('string', 'Service');
    servicesData.addColumn('number', 'Number of Coaches');
    servicesData.addColumn({type:'string', role:'style'});

    for(i = 0; i < jsonCoachCount.length; i++){
        tempArray =[];
        tempArray.push(String (jsonCoachCount[i]['Name']),
                parseInt(jsonCoachCount[i]['Service_Count']),
                'color:Red');
        servicesData.addRow(tempArray);
    }

    var options = {
        backgroundColor: {
            fill: '#E8E4D8'
        },
        legend: { position: 'none' },
        titleTextStyle:{
            bold: 'true'
        },
        chart: {
            title: 'Coaches by Service',
            subtitle: 'Coaches by Services: From 2016-09-10 until Today'
        },
        bar: {
            groupWidth: '60%'
        },
        'hAxis': {
            textStyle: {
                fontSize: 11
            }
        }
    };

    var chart = new google.charts.Bar(document.getElementById('servicesChart'));

    chart.draw(servicesData, google.charts.Bar.convertOptions(options));

}
<html>

<head>
<script type="text/javascript"     src="https://www.gstatic.com/charts/loader.js"></script>
</head>

<body>

</body>

</html>

我不知道我哪里出错了,或者我误解了一份文件.我很感激帮助改变条形图上的条形颜色,谢谢！

解决方法:

colors选项中的每种颜色都应用于数据表中的每个系列/ y轴列.
如果只有一个y轴列,则只应用一种颜色.

否则,Style Column Role是为单个条形图着色的最简单方法.
但是,它不适用于材料图表.

有关选项,请参见示例图表…

Chart 1 = Material Chart
Chart 2 = Core Chart
Both built the same way with various style settings
Works on Core, not on Material

如果您对每个酒吧颜色相同都很好……

Chart 3 = Material Chart
Uses colors configuration option to change the color to red
Only one series exists, so accepts only one color

如果每个条形图必须具有单独颜色的材料图表…

Chart 4 = Material Chart
Each value is added as a column, instead of a row, creating multiple series
Uses colors configuration option to change color for each bar
series option can also be used here
However, much harder to work with, notice Spacer column and lack of hAxis labels…

google.charts.load('current', {
  callback: init,
  packages: ['bar', 'corechart']
});

function init() {
  var jsonCoachCount = JSON.parse('[{"Service_Count":"4","Name":"Other"},  {"Service_Count":"4","Name":"Campus Network"},{"Service_Count":"3","Name":"Learn@UW"},{"Service_Count":"2","Name":"Customer Service"},{"Service_Count":"1","Name":"Blackboard Collaborate"},{"Service_Count":"1","Name":"Office 365"},{"Service_Count":"1","Name":"Multiple"},{"Service_Count":"1","Name":"Office-ionado"},{"Service_Count":"1","Name":"Case Notes"},{"Service_Count":"1","Name":"ResNet"}]');

  var options = {
      backgroundColor: {
          fill: '#E8E4D8'
      },
      legend: { position: 'none' },
      titleTextStyle:{
          bold: 'true'
      },
      chart: {
          title: 'Coaches by Service',
          subtitle: 'Coaches by Services: From 2016-09-10 until Today'
      },
      bar: {
          groupWidth: '60%'
      },
      hAxis: {
          textStyle: {
              fontSize: 11
          }
      }
  };

  drawChart();
  drawSeriesChart();

  function drawChart() {
      var servicesData = new google.visualization.DataTable();

      servicesData.addColumn('string', 'Service');
      servicesData.addColumn('number', 'Number of Coaches');
      servicesData.addColumn({type:'string', role:'style'});

      for (i = 0; i < jsonCoachCount.length; i++) {
          var tempArray =[];
          var tempColor;
          switch (i) {
            case 0:
              tempColor = 'color:Red';
              break;

            case 1:
              tempColor = 'orange';
              break;

            case 2:
              tempColor = 'fill-color: gold;';
              break;

            case 3:
              tempColor = 'bar {color: green;}';
              break;

            case 4:
              tempColor = 'bar {fill-color: blue;}';
              break;

            default:
              tempColor = 'bar {fill-color: cyan; stroke-color: black; stroke-width: 4;}';
          }
          tempArray.push(
            String (jsonCoachCount[i]['Name']),
            parseInt(jsonCoachCount[i]['Service_Count']),
            tempColor
          );
          servicesData.addRow(tempArray);
      }

      var chart = new google.charts.Bar(document.getElementById('servicesChart1'));
      chart.draw(servicesData, google.charts.Bar.convertOptions(options));

      var chart = new google.visualization.ColumnChart(document.getElementById('servicesChart2'));
      chart.draw(servicesData, options);

      // only one series exists -- only one color will work
      options.colors = ['red'];
      var chart = new google.charts.Bar(document.getElementById('servicesChart3'));
      chart.draw(servicesData, google.charts.Bar.convertOptions(options));
  }

  function drawSeriesChart() {
      var servicesData = new google.visualization.DataTable();

      servicesData.addColumn('string', 'Service');
      for (i = 0; i < jsonCoachCount.length; i++) {
        servicesData.addColumn('number', String (jsonCoachCount[i]['Name']));
        servicesData.addColumn('number', 'Spacer');
      }

      var tempArray = [];
      tempArray.push('Number of Coaches');
      for (i = 0; i < jsonCoachCount.length; i++) {
        tempArray.push(parseInt(jsonCoachCount[i]['Service_Count']));
        tempArray.push(null);
      }
      servicesData.addRow(tempArray);

      options.colors = [
        'deeppink',
        'red',
        'orange',
        'gold',
        'green',
        'blue',
        'indigo',
        'purple',
        'violet',
        'pink'
      ];

      var chart = new google.charts.Bar(document.getElementById('servicesChart4'));
      chart.draw(servicesData, google.charts.Bar.convertOptions(options));
  }
}

div {
  padding: 2px 0px 2px 0px;
  font-weight: bold;
}

.code {
  background-color: lightgray;
  font-family: Courier New;
}

<script src="https://www.gstatic.com/charts/loader.js"></script>
<div>1. Material Chart</div>
<div id="servicesChart1"></div>
<div>2. Core Chart</div>
<div id="servicesChart2"></div>
<div>3. Material Chart with <span class="code">colors: ['red']</span></div>
<div id="servicesChart3"></div>
<div>4. Multi-Series Material Chart</div>
<div id="servicesChart4"></div>

标签：javascript,charts,google-visualization,bar-chart
来源： https://codeday.me/bug/20190917/1808864.html