What could be causing the chart.js canvas to ignore the padding set on the container element?

I'm currently utilizing Chart.js for a basic line chart, however I noticed that the width and height properties calculated by Chart.js appear to be based on the overall width and height of the parent element, disregarding any padding.

let options = {
    maintainAspectRatio: false,
    responsive: true
};

let data = {
    labels: ["", "", "", "", "", "", ""],
    datasets: [
        {
            label: "My First dataset",
            fillColor: "rgba(220,220,220,0.2)",
            strokeColor: "rgba(220,220,220,1)",
            pointColor: "rgba(220,220,220,1)",
            pointStrokeColor: "#fff",
            pointHighlightFill: "#fff",
            pointHighlightStroke: "rgba(220,220,220,1)",
            data: [65, 59, 80, 81, 56, 55, 40]
        },
        {
            label: "My Second dataset",
            fillColor: "rgba(151,187,205,0.2)",
            strokeColor: "rgba(151,187,205,1)",
            pointColor: "rgba(151,187,205,1)",
            pointStrokeColor: "#fff",
            pointHighlightFill: "#fff",
            pointHighlightStroke: "rgba(151,187,205,1)",
            data: [28, 48, 40, 19, 86, 27, 90]
        }
    ]
};

let ctx1 = document.getElementById("mychart1").getContext("2d");
let myNewChart = new Chart(ctx1).Line(data, options);
.container {
    padding: 15px;
    width: 300px;
    height: 200px;
    border: 1px solid black;
}

.child {
    display: inline-block;
    border: 1px solid red;
    width:100%;
    height:100%;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.1.1/Chart.js"></script>


<div class='container'>
    <canvas id='mychart1' class='child'></canvas>
</div>
<br>
<div class='container'>
    <div class='child'>test</div>
</div>

Check out JSFiddle here

The second container and child exhibit the behavior that I anticipated. Could this be a bug in how Chart.js calculates canvas width and height or is it possible that I am making a styling error?

javascripthtmlcsscanvaschart.js

Answer №1

Dealing with a similar issue regarding a responsive canvas, I came up with the following solution:

<section>
    <canvas id="chart-container"></canvas>
</section>

Instead of directly placing the canvas element, I wrapped it inside a section. By doing so, I was able to ensure that the canvas scaled properly within its container while taking into account any padding present in the layout.

Answer №2

After doing some research online, I came across a straightforward solution to this issue.

To improve the appearance, I included the height attribute which will adjust the width automatically for a more polished look. If desired, one could also incorporate the width attribute. Keep in mind that the canvas element is part of the HTML5 standard.

Remember that you cannot input values with px, so just enter the numerical value you require without specifying pixels.

<canvas id="myChart" height="80"></canvas>

Answer №3

For the demonstration in your jsfiddle, simply modify the responsive attribute to be set as false:

var settings = {
    maintainAspectRatio: true,
    responsive: false
};

Prior to this adjustment, an additional 30px was being added to both the height and width when inspecting the element via Chrome developer tools. Given the canvas size, resizing should not pose any issues.

VIEW JSFIDDLE EXAMPLE

Answer №4

An improved method would be implementing 

.container {box-sizing: border-box;}

Answer №5

I enclosed the chart in a div element and applied the following CSS code.

.visualization-container {
  box-sizing:border-box;
  margin:2%;
  width:96%;
}

This ensures that the chart has padding from the edges and adapts to different screen sizes. While I used 2%, feel free to adjust the percentages according to your layout.

Answer №6

"If you were looking to ensure that all charts are responsive and adjust in size based on the browser window, you can modify the following setting:"

Chart.defaults.global.responsive = true;

"As a result, whenever a chart is created, the responsive option will automatically be set to true."

Source: http://www.chartjs.org/docs/

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