在 Chart.js 中设置图表高度

2022-01-22 00:00:00 jquery javascript chart.js

我想用 Chart.js 绘制一个水平条形图，但它一直在缩放图表，而不是使用我从脚本中分配的画布高度.

I want to draw a horizontal bar chart with Chart.js but it keeps scaling the chart instead of using the height I assign the canvas form the script.

有没有办法从脚本中设置图形的高度?

Is there any way to set the height of the graph from the script?

参见小提琴:Jsfiddle

HTML

<div class="graph">
  <div class="chart-legend">

  </div>
  <div class="chart">
    <canvas id="myChart"></canvas>
  </div>
</div>

JavaScript

var ctx = $('#myChart');

ctx.height(500);

var myChart = new Chart(ctx, {
    type: 'horizontalBar',
    data: {
        labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
        datasets: [{
            label: '# of Votes',
            data: [12, 19, 3, 5, 2, 3],
            backgroundColor: [
                'rgba(255, 99, 132, 0.2)',
                'rgba(54, 162, 235, 0.2)',
                'rgba(255, 206, 86, 0.2)',
                'rgba(75, 192, 192, 0.2)',
                'rgba(153, 102, 255, 0.2)',
                'rgba(255, 159, 64, 0.2)'
            ],
            borderColor: [
                'rgba(255,99,132,1)',
                'rgba(54, 162, 235, 1)',
                'rgba(255, 206, 86, 1)',
                'rgba(75, 192, 192, 1)',
                'rgba(153, 102, 255, 1)',
                'rgba(255, 159, 64, 1)'
            ],
            borderWidth: 1
        }]
    },
    maintainAspectRatio: false,
    options: {
        scales: {
            yAxes: [{
                ticks: {
                    beginAtZero:true
                }
            }]
        }
    }
});

推荐答案

似乎 var ctx = $('#myChart'); 正在返回一个元素列表.您需要使用 ctx[0] 来引用第一个.高度也是一个属性，而不是一个函数.

Seems like var ctx = $('#myChart'); is returning a list of elements. You would need to reference the first by using ctx[0]. Also height is a property, not a function.

我在我的代码中是这样做的:

I did it this way in my code:

var chartEl = document.getElementById("myChart");
chartEl.height = 500;

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