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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
Let’s 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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