Chart.js Tick Configuration 示例

HTML

CSS

JavaScript

HTML

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<head>
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<title>Chart.js Tick Configuration</title>
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</head>
  
<body>
<div class="chart-example">
  <div class="tab-content">
    <div class="chart-view"><canvas id="myChart"></canvas></div>
    <div class="chart-actions mt-3"></div>
    <ul class="nav nav-tabs mt-3">
      <li class="nav-item">
        <a class="nav-link active" data-toggle="tab" href="#myChart-config" aria-selected="true">Config</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" data-toggle="tab" href="#myChart-setup" aria-selected="false">Setup</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" data-toggle="tab" href="#myChart-actions" aria-selected="false">Actions</a>
      </li>
    </ul>
    <div class="tab-content">
      <div class="tab-pane fade show active tab-pane-code" id="myChart-config">
        <pre>
const config = {
  type: 'line',
  data: data,
  options: {
    responsive: true,
    plugins: {
      title: {
        display: true,
        text: 'Chart with Tick Configuration'
      }
    },
    scales: {
      x: {
        ticks: {
          // For a category axis, the val is the index so the lookup via getLabelForValue is needed
          callback: function(val, index) {
            // Hide every 2nd tick label
            return index % 2 === 0 ? this.getLabelForValue(val) : '';
          },
          color: 'red',
        }
      }
    }
  },
};
        </pre>
      </div>
      <div class="tab-pane fade tab-pane-code" id="myChart-setup">
        <pre>
const DATA_COUNT = 12;
const NUMBER_CFG = {count: DATA_COUNT, min: 0, max: 100};
const data = {
  labels: [['June', '2015'], 'July', 'August', 'September', 'October', 'November', 'December', ['January', '2016'], 'February', 'March', 'April', 'May'],
  datasets: [
    {
      label: 'Dataset 1',
      data: Utils.numbers(NUMBER_CFG),
      fill: false,
      borderColor: Utils.CHART_COLORS.red,
      backgroundColor: Utils.transparentize(Utils.CHART_COLORS.red, 0.5),
    },
    {
      label: 'Dataset 2',
      data: Utils.numbers(NUMBER_CFG),
      fill: false,
      borderColor: Utils.CHART_COLORS.blue,
      backgroundColor: Utils.transparentize(Utils.CHART_COLORS.blue, 0.5),
    }
  ]
};
        </pre>
      </div>
      <div class="tab-pane fade tab-pane-code" id="myChart-actions">
        <pre>
const actions = [
  {
    name: 'Alignment: start',
    handler(chart) {
      chart.options.scales.x.ticks.align = 'start';
      chart.update();
    }
  },
  {
    name: 'Alignment: center (default)',
    handler(chart) {
      chart.options.scales.x.ticks.align = 'center';
      chart.update();
    }
  },
  {
    name: 'Alignment: end',
    handler(chart) {
      chart.options.scales.x.ticks.align = 'end';
      chart.update();
    }
  },
];
        </pre>
      </div>
    </div>
  </div>
</div>

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</body>
</html>

CSS

body{
  background: #fff;
}
.tab-content .chart-view {
  max-width: 800px;
}
.tab-content .tab-pane-code {
  height: 360px;
  overflow: auto;
}
.tab-content .tab-pane-code pre {
  height: 100%;
  margin: 0px;
}
.chart-example {
  width: calc(100% - 2px);
  border: 1px solid #ececec;
  padding: 10px;
}

JavaScript

const actions = [
  {
    name: 'Alignment: start',
    handler(chart) {
      chart.options.scales.x.ticks.align = 'start';
      chart.update();
    }
  },
  {
    name: 'Alignment: center (default)',
    handler(chart) {
      chart.options.scales.x.ticks.align = 'center';
      chart.update();
    }
  },
  {
    name: 'Alignment: end',
    handler(chart) {
      chart.options.scales.x.ticks.align = 'end';
      chart.update();
    }
  },
];

const DATA_COUNT = 12;
const NUMBER_CFG = {count: DATA_COUNT, min: 0, max: 100};
const data = {
  labels: [['June', '2015'], 'July', 'August', 'September', 'October', 'November', 'December', ['January', '2016'], 'February', 'March', 'April', 'May'],
  datasets: [
    {
      label: 'Dataset 1',
      data: Utils.numbers(NUMBER_CFG),
      fill: false,
      borderColor: Utils.CHART_COLORS.red,
      backgroundColor: Utils.transparentize(Utils.CHART_COLORS.red, 0.5),
    },
    {
      label: 'Dataset 2',
      data: Utils.numbers(NUMBER_CFG),
      fill: false,
      borderColor: Utils.CHART_COLORS.blue,
      backgroundColor: Utils.transparentize(Utils.CHART_COLORS.blue, 0.5),
    }
  ]
};

const config = {
  type: 'line',
  data: data,
  options: {
    responsive: true,
    plugins: {
      title: {
        display: true,
        text: 'Chart with Tick Configuration'
      }
    },
    scales: {
      x: {
        ticks: {
          // For a category axis, the val is the index so the lookup via getLabelForValue is needed
          callback: function(val, index) {
            // Hide every 2nd tick label
            return index % 2 === 0 ? this.getLabelForValue(val) : '';
          },
          color: 'red',
        }
      }
    }
  },
};

const ctx = document.getElementById('myChart');

const chart = new Chart(ctx, config);

$.each(actions, function(index, value) {
    let aHtml = $('<a></a>').addClass('btn btn-default m-r-5').html(value.name);
    $('.chart-actions').append(aHtml);
    aHtml.on('click', function () {
        value.handler(chart);
    });
});