Chart.js - Options

Quiz

In Chart.js, using a context dependent route, the Options are resolved from top of the code to the bottom of it. We have different levels of options as shown below −

Chart Level Options

We have three chart level options −

options
overrides
defaults

Dataset Level Options

Chart.js provides us below options to be used at dataset level −

dataset
options.datasets
options
overrides
defaults.datasets
defaults

Dataset Animation Options

Chart.js provides us below options to be used at dataset animation level −

Dataset.animation
options.datasets.animation
options.animation
overrides.datasets.animation
defaults.datasets.animation
defaults.animation

Dataset Element Level Options

Chart.js provides us below options to be used at dataset element level −

Dataset
options.datasets
options.datasets.elements
options.elements
options
overrides.datasets
overrides.datasets.elements
defaults.datasets
defaults.datasets.elements
defaults.elements
defaults

Scale Options

Chart.js provides us below scale options −

options.scale
overrides.scales
overrides.datasets.elements
defaults.scales
defaults.scale

Plugin Options

Chart.js provides us below plugin options that provides array of paths to additionally look for its options in −

options.scale
options.plugins[plugin.id]
(options.[...plugin.additionalOptionScopes])
overrides[config.type].plugins[plugin.id]
defaults.plugins[plugin.id]
(defaults.[...plugin.additionalOptionScopes])

Example

Lets take an example in which we will use various Options in our chart −

<!DOCTYPE>
<html>
<head>
   <meta charset- "UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1" />
   <title>chart.js</title>
</head>
<body>
   <canvas id="chartId" aria-label="chart" height="350" width="580"></canvas>
   <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.1.1/chart.min.js"></script>
   <script>
      var chrt = document.getElementById("chartId").getContext("2d");
      var chartId = new Chart(chrt, {
         type: 'bar',
         data: {
            labels: ["HTML", "CSS", "JAVASCRIPT", "CHART.JS", "JQUERY", "BOOTSTRP"],
            datasets: [{
            label: "online tutorial subjects",
            data: [20, 40, 30, 35, 30, 20],
            backgroundColor: ['yellow', 'aqua', 'pink', 'lightgreen', 'lightblue', 'gold'],
            borderColor: ['red', 'blue', 'fuchsia', 'green', 'navy', 'black'],
            borderWidth: 2,
            }],
         },
         options: {
            responsive: false,
            layout: {
               padding: {
                  left: 40,
                  right: 40,
               }
            },
            plugins: {
               legend: {
                  labels: {
                     font: {
                        size: 25,
                        family: 'Helvetica',
                        style: 'bold',
                     }
                  }
               }
            }
         },
      });
   </script>
</body>
</html>

Output

The following output chart shows padding of the element and font style −

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