Chart.js Position 示例

HTML

CSS

JavaScript

HTML

<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" />
<title>Chart.js Position</title>
<meta name="keywords" content="LightYear,光年,后台模板,后台管理系统,光年HTML模板">
<meta name="description" content="LightYear是一个基于Bootstrap的后台管理系统的HTML模板。">
<meta name="author" content="yinqi">
<link rel="stylesheet" type="text/css" href="http://lyear.itshubao.com/v4/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="http://lyear.itshubao.com/v4/css/style.min.css">
</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-positioner" aria-selected="false">Positioner</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: {
    interaction: {
      intersect: false,
      mode: 'index',
    },
    plugins: {
      title: {
        display: true,
        text: (ctx) => 'Tooltip position mode: ' + ctx.chart.options.plugins.tooltip.position,
      },
    }
  }
};
        </pre>
      </div>
      <div class="tab-pane fade tab-pane-code" id="myChart-positioner">
        <pre>
// Create a custom tooltip positioner to put at the bottom of the chart area
components.Tooltip.positioners.bottom = function(items) {
  const pos = components.Tooltip.positioners.average(items);

  // Happens when nothing is found
  if (pos === false) {
    return false;
  }

  const chart = this.chart;

  return {
    x: pos.x,
    y: chart.chartArea.bottom,
    xAlign: 'center',
    yAlign: 'bottom',
  };
};
        </pre>
      </div>
      <div class="tab-pane fade tab-pane-code" id="myChart-setup">
        <pre>
const DATA_COUNT = 7;
const NUMBER_CFG = {count: DATA_COUNT, min: -100, max: 100};
const data = {
  labels: Utils.months({count: DATA_COUNT}),
  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: 'Position: average',
    handler(chart) {
      chart.options.plugins.tooltip.position = 'average';
      chart.update();
    }
  },
  {
    name: 'Position: nearest',
    handler(chart) {
      chart.options.plugins.tooltip.position = 'nearest';
      chart.update();
    }
  },
  {
    name: 'Position: bottom (custom)',
    handler(chart) {
      chart.options.plugins.tooltip.position = 'bottom';
      chart.update();
    }
  },
];
        </pre>
      </div>
    </div>
  </div>
</div>

<script type="text/javascript" src="http://lyear.itshubao.com/v4/js/jquery.min.js"></script>
<script type="text/javascript" src="http://lyear.itshubao.com/v4/js/popper.min.js"></script>
<script type="text/javascript" src="http://lyear.itshubao.com/v4/js/bootstrap.min.js"></script>
<script type="text/javascript" src="https://cdn.bootcdn.net/ajax/libs/Chart.js/4.1.1/chart.umd.min.js"></script>
<script type="text/javascript" src="https://cdn.bootcdn.net/ajax/libs/luxon/3.2.0/luxon.min.js"></script>
<script type="text/javascript" src="http://libs.itshubao.com/chartjs/utils.js"></script>
</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: 'Position: average',
    handler(chart) {
      chart.options.plugins.tooltip.position = 'average';
      chart.update();
    }
  },
  {
    name: 'Position: nearest',
    handler(chart) {
      chart.options.plugins.tooltip.position = 'nearest';
      chart.update();
    }
  },
  {
    name: 'Position: bottom (custom)',
    handler(chart) {
      chart.options.plugins.tooltip.position = 'bottom';
      chart.update();
    }
  },
];

const DATA_COUNT = 7;
const NUMBER_CFG = {count: DATA_COUNT, min: -100, max: 100};
const data = {
  labels: Utils.months({count: DATA_COUNT}),
  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: {
    interaction: {
      intersect: false,
      mode: 'index',
    },
    plugins: {
      title: {
        display: true,
        text: (ctx) => 'Tooltip position mode: ' + ctx.chart.options.plugins.tooltip.position,
      },
    }
  }
};

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

const chart = new Chart(ctx, config);

// Create a custom tooltip positioner to put at the bottom of the chart area
Chart.Tooltip.positioners.bottom = function(items) {
  const pos = Chart.Tooltip.positioners.average(items);

  // Happens when nothing is found
  if (pos === false) {
    return false;
  }

  const chart = this.chart;

  return {
    x: pos.x,
    y: chart.chartArea.bottom,
    xAlign: 'center',
    yAlign: 'bottom',
  };
};


$.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);
    });
});