Create a Bootstrap-compatible responsive doughnut chart using Chart.JS that spans the full width of the

Question

Create a Bootstrap-compatible responsive doughnut chart using Chart.JS that spans the full width of the

I am utilizing the Angular.js version of Chart.js, although the core functionality remains consistent.

Currently, I have a basic doughnut chart placed inside a responsive Bootstrap container:

<div class="row">
    <div class="col-xs-8">
       <div class="chart-container">
          <canvas id="doughnut" 
                  chart-data="data" 
                  chart-labels="labels" 
                  chart-options="mainDonut" 
                  class="chart chart-doughnut">
          </canvas>
       </div>
    </div>
</div>

The controller options for this setup are as follows:

 $scope.mainDonut ={
    percentageInnerCutout : 90,
    responsive: true
}

Apparently, the chart's width is restricted to match the height of the div container, which is somehow set at around 300px by ChartJS. This results in the following rendering:

https://i.sstatic.net/XCkxQ.png

I aim to make the height adapt dynamically based on the width of my .col-xs-8, completely filling the entire div container. While I am aware that I could achieve this using JavaScript events for window resizing, I prefer to explore other solutions to avoid such scripting if possible.

Any suggestions or alternative approaches would be greatly appreciated?

javascript css chart.js

Answer 1

Answer №1

To ensure responsiveness while maintaining aspect ratio, there are two key considerations:

1) Update the options object with the following properties:

{
   responsive: true,
   maintainAspectRatio: true, 
}

2) Specify the aspect ratio by defining both the width and height attributes for the canvas element. In this scenario, they likely have the same value:

<canvas id="doughnut" 
    width="100"
    height="100"
    chart-data="data" 
    chart-labels="labels" 
    chart-options="mainDonut" 
    class="chart chart-doughnut">
</canvas>

Answer 2

To ensure responsiveness while maintaining aspect ratio, there are two key considerations:

1) Update the options object with the following properties:

{
   responsive: true,
   maintainAspectRatio: true, 
}

2) Specify the aspect ratio by defining both the width and height attributes for the canvas element. In this scenario, they likely have the same value:

<canvas id="doughnut" 
    width="100"
    height="100"
    chart-data="data" 
    chart-labels="labels" 
    chart-options="mainDonut" 
    class="chart chart-doughnut">
</canvas>

Answer 3

Answer №2

The width of the chart seems to be constrained by the height of the div container, which ChartJS is setting at around 300px inexplicably.

This is actually the default width of the canvas element (http://www.w3.org/TR/html5/scripting-1.html#the-canvas-element).

It appears that the responsive option is not functioning as intended. This could be due to the fact that the parent element lacks a measurable size when the chart is initialized. In Angular, this often occurs when the wrapping elements are not fully rendered at initialization (e.g., due to an ng-show or being within a hidden tab).

CSS styling on the parent element might also be causing issues - although based on your markup, this seems less likely.

Keep in mind that even if you do not manually resize the chart on window resize, Chart.js will automatically adjust it for all responsive charts.

Answer 4

The width of the chart seems to be constrained by the height of the div container, which ChartJS is setting at around 300px inexplicably.

This is actually the default width of the canvas element (http://www.w3.org/TR/html5/scripting-1.html#the-canvas-element).

It appears that the responsive option is not functioning as intended. This could be due to the fact that the parent element lacks a measurable size when the chart is initialized. In Angular, this often occurs when the wrapping elements are not fully rendered at initialization (e.g., due to an ng-show or being within a hidden tab).

CSS styling on the parent element might also be causing issues - although based on your markup, this seems less likely.

Keep in mind that even if you do not manually resize the chart on window resize, Chart.js will automatically adjust it for all responsive charts.

Answer 5

Answer №3

function generateChart() {
    var canvas = document.getElementById('chart-canvas');
    canvas.width = container.offsetWidth;
    canvas.height = container.offsetWidth; ... 
}

+css container block {
   width: 100%;
   min-height: 300px;
}

Trust this information proves useful to you.

Answer 6

function generateChart() {
    var canvas = document.getElementById('chart-canvas');
    canvas.width = container.offsetWidth;
    canvas.height = container.offsetWidth; ... 
}

+css container block {
   width: 100%;
   min-height: 300px;
}

Trust this information proves useful to you.

Create a Bootstrap-compatible responsive doughnut chart using Chart.JS that spans the full width of the

Answer №1

Answer №2

Answer №3

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