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feat: add first working draft of chartjs islands (#15)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| export { Chart as default } from "$fresh_charts/island.tsx"; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| import ChartJS, { | ||
| type ChartConfiguration, | ||
| type ChartType, | ||
| type DefaultDataPoint, | ||
| } from "chart.js"; | ||
| import type { JSX } from "preact"; | ||
| import { useEffect, useRef } from "preact/hooks"; | ||
|
|
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| export type { ChartType, DefaultDataPoint }; | ||
|
|
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| export type ChartProps< | ||
| Type extends ChartType, | ||
| Data = DefaultDataPoint<Type>, | ||
| Label = unknown, | ||
| > = ChartConfiguration<Type, Data, Label> & { | ||
| canvas?: JSX.HTMLAttributes<HTMLCanvasElement>; | ||
| }; | ||
|
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| /** | ||
| * A hook which takes in a Chart.js configuration object and returns `canvasRef` and `chartRef`. | ||
| * | ||
| * `canvasRef` is a reference to the canvas element which the chart is rendered to. | ||
| * `chartRef` is a reference to the Chart.js instance. | ||
| */ | ||
| function useChart< | ||
| Type extends ChartType, | ||
| Data = DefaultDataPoint<Type>, | ||
| Label = unknown, | ||
| >(options: ChartConfiguration<Type, Data, Label>) { | ||
| const canvasRef = useRef<HTMLCanvasElement | null>(null); | ||
| const chartRef = useRef<ChartJS<Type, Data, Label> | null>(null); | ||
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| useEffect(() => { | ||
| if (canvasRef.current === null) { | ||
| throw new Error("canvas is null"); | ||
| } | ||
| if (chartRef.current) { | ||
| chartRef.current.destroy(); | ||
| } | ||
|
|
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| chartRef.current = new ChartJS( | ||
| canvasRef.current, | ||
| options, | ||
| ); | ||
|
|
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| return () => { | ||
| chartRef.current?.destroy(); | ||
| }; | ||
| }, [canvasRef, options]); | ||
|
|
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| return { canvasRef, chartRef }; | ||
| } | ||
|
|
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| /** | ||
| * A JSX component which can be used to client side render a chart inline | ||
| * within a page. | ||
| * | ||
| * View {@linkcode ChartProps} for a list of properties that can be set | ||
| * on the component. | ||
| * | ||
| * ### Example | ||
| * | ||
| * ```tsx | ||
| * import { Chart } from "https://deno.land/x/fresh_charts/island.tsx"; | ||
| * import { ChartColors } from "https://deno.land/x/fresh_charts/utils.ts"; | ||
| * | ||
| * export default App() { | ||
| * return <> | ||
| * <h1>Chart Example</h1> | ||
| * <Chart | ||
| * type="line" | ||
| * options={{ | ||
| * scales: { yAxes: [{ ticks: { beginAtZero: true } }] }, | ||
| * }} | ||
| * data={{ | ||
| * labels: ["1", "2", "3"], | ||
| * datasets: [{ | ||
| * label: "Sessions", | ||
| * data: [123, 234, 234], | ||
| * borderColor: ChartColors.Red, | ||
| * borderWidth: 1, | ||
| * }, { | ||
| * label: "Users", | ||
| * data: [346, 233, 123], | ||
| * borderColor: ChartColors.Blue, | ||
| * borderWidth: 1, | ||
| * }], | ||
| * }} | ||
| * /> | ||
| * <>; | ||
| * } | ||
| * ``` | ||
| */ | ||
| export function Chart<Type extends ChartType>(props: ChartProps<Type>) { | ||
| const { canvasRef, chartRef } = useChart<Type>(props); | ||
|
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| useEffect(() => { | ||
| chartRef.current?.render(); | ||
| }, []); | ||
|
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| return <canvas ref={canvasRef} />; | ||
| } |