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<div class="relative i-full" style="block-size: 400px;">
  <canvas aria-label="Example" role="img" data-controller="chart" data-chart-type-value="radar" data-chart-data-value="{"labels":["Eating","Drinking","Sleeping","Designing","Coding","Cycling","Running"],"datasets":[{"label":"Dataset 1","backgroundColor":"#8ec5ff80","borderColor":"#8ec5ff","data":[65,59,90,81,56,55,40]},{"label":"Dataset 2","backgroundColor":"#2b7fff80","borderColor":"#2b7fff","data":[28,48,40,19,96,27,100]}]}"></canvas>
</div>
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<% @chart_data = {
  labels: [ "Eating", "Drinking", "Sleeping", "Designing", "Coding", "Cycling", "Running" ],
  datasets: [
    { label: "Dataset 1", backgroundColor: "#8ec5ff80", borderColor: "#8ec5ff", data: [65, 59, 90, 81, 56, 55, 40] },
    { label: "Dataset 2", backgroundColor: "#2b7fff80", borderColor: "#2b7fff", data: [28, 48, 40, 19, 96, 27, 100] }
  ]
} %>
<div class="relative i-full" style="block-size: 400px;">
  <%= tag.canvas aria: { label: "Example" }, role: "img", data: { controller: "chart", chart_type_value: "radar", chart_data_value: @chart_data.to_json } %>
</div>
CSS is not required or multiple files are needed, check the notes.
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import { Controller } from "@hotwired/stimulus"
import { Chart, registerables } from "https://esm.sh/chart.js@4.5.1?standalone"
export default class extends Controller {
  static values = { type: { type: String, default: "line" }, data: Object, options: Object }
  initialize() {
    Chart.register(...registerables)
    Chart.defaults.backgroundColor = getComputedStyle(document.body).backgroundColor
    Chart.defaults.borderColor = getComputedStyle(document.body).borderColor
    Chart.defaults.color = getComputedStyle(document.body).color
    Chart.defaults.font.family = getComputedStyle(document.body).fontFamily
    Chart.defaults.font.size = 12
    Chart.defaults.elements.bar.borderRadius = 6
    Chart.defaults.elements.arc.borderRadius = 6
    Chart.defaults.plugins.legend.labels.usePointStyle = true
    Chart.defaults.plugins.tooltip.backgroundColor = Chart.defaults.backgroundColor
    Chart.defaults.plugins.tooltip.bodyColor = Chart.defaults.color
    Chart.defaults.plugins.tooltip.borderColor = Chart.defaults.borderColor
    Chart.defaults.plugins.tooltip.borderWidth = 1
    Chart.defaults.plugins.tooltip.boxPadding = 6
    Chart.defaults.plugins.tooltip.caretSize = 0
    Chart.defaults.plugins.tooltip.titleColor = Chart.defaults.color
    Chart.defaults.plugins.tooltip.usePointStyle = true
  }
  connect() {
    this.chart = new Chart(this.element, this.#settings)
  }
  disconnect() {
    this.chart.destroy()
  }
  get #settings() {
    return { type: this.typeValue, data: this.dataValue, options: this.optionsValue }
  }
}

Dependencies