Chart.js图表无法水平排列问题排查（附代码）

Hey there! Let's troubleshoot why your charts are stacking vertically instead of sitting side by side. Here are the key issues and fixes:

1. Typo in Bootstrap Grid Class #

You wrote <div class="raw"> but the correct Bootstrap container class for rows is .row. Bootstrap's grid system relies on .row to apply the proper flexbox/float styling that makes columns line up horizontally. Without it, the .col-md-2 elements will behave like regular block-level elements and stack vertically.

Fixed HTML Structure #

<div class="container">
  <div class="row"> <!-- Corrected from "raw" to "row" -->
    <!-- Chart wrapper -->
    <div class="col-md-2">
      <canvas id="chart1"></canvas>
    </div>
    <div class="col-md-2">
      <canvas id="chart2"></canvas>
    </div>
    <div class="col-md-2">
      <canvas id="chart3"></canvas>
    </div>
    <div class="col-md-2">
      <canvas id="chart4"></canvas>
    </div>
  </div>
</div>

2. Missing Bootstrap CSS #

If you haven't included Bootstrap's stylesheet in your page, the .col-md-2 and .row classes won't have any layout effect. Make sure you add Bootstrap's CSS in the <head> section of your HTML:

<head>
  <!-- Include Bootstrap CSS (use local file or official distribution) -->
  <link rel="stylesheet" href="path/to/bootstrap.min.css">
</head>

3. Optional: Check Chart Canvas Sizing #

In some cases, Chart.js might set a default width on the canvas that makes it overflow the column container. To prevent this, you can add a custom style to ensure the canvas fits within its column:

canvas {
  max-width: 100%;
  height: auto;
}

Full Working Example #

Here's the complete code with fixes applied (plus a reusable function to avoid duplicate code):

<!DOCTYPE html>
<html>
<head>
  <link rel="stylesheet" href="path/to/bootstrap.min.css">
  <style>
    canvas {
      max-width: 100%;
      height: auto;
    }
  </style>
</head>
<body>
  <div class="container">
    <div class="row">
      <div class="col-md-2">
        <canvas id="chart1"></canvas>
      </div>
      <div class="col-md-2">
        <canvas id="chart2"></canvas>
      </div>
      <div class="col-md-2">
        <canvas id="chart3"></canvas>
      </div>
      <div class="col-md-2">
        <canvas id="chart4"></canvas>
      </div>
    </div>
  </div>

  <script src="path/to/chart.min.js"></script>
  <script>
    // Reusable function to create charts
    function createChart(canvasId) {
      const mylabel = ["A", "B"];
      const mydata = [10, 20];
      const ctx = document.getElementById(canvasId);
      new Chart(ctx, {
        type: 'horizontalBar',
        data: {
          labels: mylabel,
          datasets: [{
            label: '# of Votes',
            data: mydata,
            backgroundColor: [
              'rgba(255, 99, 132, 0.2)',
              'rgba(54, 162, 235, 0.2)'
            ],
            borderColor: [
              'rgba(255, 99, 132, 1)',
              'rgba(54, 162, 235, 1)'
            ],
            borderWidth: 1,
            barThickness: 10
          }]
        },
        options: {
          scales: {
            xAxes: [{
              barPercentage: 0.5,
              barThickness: 6,
              maxBarThickness: 8,
              minBarLength: 2,
              gridLines: {
                offsetGridLines: false
              }
            }]
          }
        }
      });
    }

    // Initialize all charts
    createChart('chart1');
    createChart('chart2');
    createChart('chart3');
    createChart('chart4');
  </script>
</body>
</html>

内容的提问来源于stack exchange，提问作者Nitin Sen