Chart.js Events 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 Events</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">
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<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-setup" aria-selected="false">HandleHover</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" data-toggle="tab" href="#myChart-actions" aria-selected="false">HandleLeave</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" data-toggle="tab" href="#myChart-data" aria-selected="false">Data</a>
      </li>
    </ul>
    <div class="tab-content">
      <div class="tab-pane fade show active tab-pane-code" id="myChart-config">
        <pre>
const config = {
  type: 'pie',
  data: data,
  options: {
    plugins: {
      legend: {
        onHover: handleHover,
        onLeave: handleLeave
      }
    }
  }
};
        </pre>
      </div>
      <div class="tab-pane fade tab-pane-code" id="myChart-setup">
        <pre>
// Append '4d' to the colors (alpha channel), except for the hovered index
function handleHover(evt, item, legend) {
  legend.chart.data.datasets[0].backgroundColor.forEach((color, index, colors) => {
    colors[index] = index === item.index || color.length === 9 ? color : color + '4D';
  });
  legend.chart.update();
}
        </pre>
      </div>
      <div class="tab-pane fade tab-pane-code" id="myChart-actions">
        <pre>
// Removes the alpha channel from background colors
function handleLeave(evt, item, legend) {
  legend.chart.data.datasets[0].backgroundColor.forEach((color, index, colors) => {
    colors[index] = color.length === 9 ? color.slice(0, -2) : color;
  });
  legend.chart.update();
}
        </pre>
      </div>
      <div class="tab-pane fade tab-pane-code" id="myChart-data">
        <pre>
const data = {
  labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
  datasets: [{
    label: '# of Votes',
    data: [12, 19, 3, 5, 2, 3],
    borderWidth: 1,
    backgroundColor: ['#CB4335', '#1F618D', '#F1C40F', '#27AE60', '#884EA0', '#D35400'],
  }]
};
        </pre>
      </div>
    </div>
  </div>
</div>

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<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 data = {
  labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
  datasets: [{
    label: '# of Votes',
    data: [12, 19, 3, 5, 2, 3],
    borderWidth: 1,
    backgroundColor: ['#CB4335', '#1F618D', '#F1C40F', '#27AE60', '#884EA0', '#D35400'],
  }]
};

// Removes the alpha channel from background colors
function handleLeave(evt, item, legend) {
  legend.chart.data.datasets[0].backgroundColor.forEach((color, index, colors) => {
    colors[index] = color.length === 9 ? color.slice(0, -2) : color;
  });
  legend.chart.update();
}

// Append '4d' to the colors (alpha channel), except for the hovered index
function handleHover(evt, item, legend) {
  legend.chart.data.datasets[0].backgroundColor.forEach((color, index, colors) => {
    colors[index] = index === item.index || color.length === 9 ? color : color + '4D';
  });
  legend.chart.update();
}

const config = {
  type: 'pie',
  data: data,
  options: {
    plugins: {
      legend: {
        onHover: handleHover,
        onLeave: handleLeave
      }
    }
  }
};

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

const chart = new Chart(ctx, config);