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svelte-lightweight-charts

(★ 117)

Svelte wrapper for financial lightweight charts

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- - bug_report.md
- - ci.yml
- svelte-jest.mjs
- - app.svelte
  - data-series.ts
  - gallery.svelte
  - global.css
  - index.ts
  - official-samples.ts
  - repl.json
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# Installation Guide

1. Get the code

git clone https://github.com/trash-and-fire/svelte-lightweight-charts

Downloads the entire project code from GitHub to your computer.

cd svelte-lightweight-charts

Moves into the project folder you just downloaded.

2. Node.js

Easy Recommended

Prerequisites

Git Needed to download the project code from GitHub.
Node.js Node.js must be installed to use npm. The LTS version is recommended.

npm install lightweight-charts svelte-lightweight-charts

Downloads and installs the libraries listed in package.json.

✅ After running the command, open the address shown in the terminal (usually something like http://localhost:3000) in your browser.

Pulled directly from this repo's README.

// repository documentation

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# svelte-lightweight-charts

This package is a Svelte wrapper for [lightweight-charts](https://github.com/tradingview/lightweight-charts)

## [Demo](https://trash-and-fire.github.io/svelte-lightweight-charts/official-samples.html)

Here are some official examples rewritten on Svelte. Each example you can open in the REPL to modify or fork

If you need more information you can see [demo app sources](./src/demo) or [example sources](./src/demo/samples)

## Installing

```bash
npm install lightweight-charts svelte-lightweight-charts
```

## Usage

```svelte
<script>
    import { Chart, LineSeries } from "svelte-lightweight-charts";
    const data = [
        { time: '2019-04-11', value: 80.01 },
        { time: '2019-04-12', value: 96.63 },
        { time: '2019-04-13', value: 76.64 },
        { time: '2019-04-14', value: 81.89 },
        { time: '2019-04-15', value: 74.43 },
        { time: '2019-04-16', value: 80.01 },
        { time: '2019-04-17', value: 96.63 },
        { time: '2019-04-18', value: 76.64 },
        { time: '2019-04-19', value: 81.89 },
        { time: '2019-04-20', value: 74.43 },
    ];
</script>
<Chart width={800} height={600}>
    <LineSeries data={data}/>
</Chart>
```

## Getting reference to lightweight-chart objects

You can use the `ref` property to get a reference to a lightweight-chart api-instance from any component.
```svelte
<script>
    let chartApi;
</script>
<Chart width={400} height={300} ref={(ref) => chartApi = ref}/>
<button on:click={() => chartApi.timeScale().fitContent()}>Fit Content</button>
```
The value of `ref` property must be a function: `(api: T | null) => void`.

It is guaranteed that ref-callback will be called with some value when the component is mounted and with null value when the component is unmounted.
If you change the ref-callback, then the previous callback will be called with a null value, and the next callback will be called with the actual value.

## Components

### Chart

`<Chart>` - main chart container and wrapping dom element.
You can pass any option from [`ChartOptions`](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/ChartOptions) as separate property.

Using `container` property you can get access to containing element:
```ts
container?: {
    ref?: (element: HTMLElement | null) => void;
    class?: string;
    id?: string;
    style?: string;
}
```
If you need a reference to the containing dom element you can use `ref` property. It might be useful to setup IntersectionObserver on this dom element.

Use `class` or `style` properties with `<Chart autoSize={true}/>` to set up an adaptive chart: 
```svelte
<Chart
    autoSize={true}
    container={{class: 'chart-container'}}
>
    <LineSeries data={data}/>
</Chart>
<style>
:global(.chart-container) {
    aspect-ratio: 16 / 9;
    width: 80%;
    margin: auto;
}
</style>
```

#### SSR
The chart component will reserve the specified `width` and `height` during SSR if the chart is not auto-sized.

Events:
- [`on:crosshairMove`](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/IChartApi#subscribeclick): `(event: CustomEvent<MouseEventParams>) => void`
- [`on:click`](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/IChartApi#subscribecrosshairmove): `(event: CustomEvent<MouseEventParams>) => void`

Use the `ref` property to get a reference to a [`IChartApi`](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/IChartApi) instance

### Series

Following types of series are supported:
- `<AreaSeries>`
- `<BarSeries>`
- `<BaselineSeries>`
- `<CandlestickSeries>`
- `<HistogramSeries>`
- `<LineSeries>`

Series components should be nested inside a chart component.

You can pass any series option as separate property. 
List of available options corresponding to each type of series can be found [here](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/SeriesOptionsMap)

Use the `ref` property to get reference to a [`ISeriesApi<SeriesType>`](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/ISeriesApi) instance.

#### Passing data
To pass a data to a series you can use the `data` property. Look [here](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/SeriesDataItemTypeMap) to find what shape of data you need for each series type.

By default `data` represents only the **initial** data. Any subsequent data update does not update series.
If you want to change this behavior please add [`reactive={true}`](https://svelte.dev/repl/0efb2840a9844ed5a1d84f2a1c9a2269) to your series component. In this case series will apply a new data if it is not reference equal to previous array.

#### Passing markers
To pass markers to a series you can use the `markers` property. Markers should be an array of `SeriesMarker<Time>`.

### Price line

To draw price line add `<PriceLine>` component inside any series.
```svelte
    <Chart width={600} height={300}>
        <LineSeries data={data}>
            <PriceLine
                title="minimum price"
                price={minimumPrice}
            />
            <PriceLine
                title="average price"
                price={avgPrice}
            />
            <PriceLine
                title="maximum price"
                price={maximumPrice}
            />
        </LineSeries>
    </Chart>
```

You can pass any options from [`PriceLineOptions`](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/PriceLineOptions) as separate property. The `price` property is mandatory in dev mode.

Use the `ref` property to get reference to a [`IPriceLine`](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/IPriceLine) instance.

#### Line drawing on click

You can draw price lines dynamically. For [example](https://svelte.dev/repl/3294790e6b5048a5abfb3d239405214b), you can draw a price line at a user-specified point.

### Time scale

`<TimeScale>` - the component is a binding to the current time scale of the current chart.
This component has to be nested inside a chart component and should not have duplicates. Each chart has only one time scale.

You can pass any option from [`TimeScaleOptions`](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/TimeScaleOptions) as separate property.

Events:
- [`on:visibleTimeRangeChange`](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/ITimeScaleApi#subscribevisibletimerangechange) - `(event: CustomEvent<TimeRange | null>) => void`
- [`on:visibleLogicalRangeChange`](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/ITimeScaleApi#subscribevisiblelogicalrangechange) - `(event: CustomEvent<LogicalRange | null>) => void`
- [`on:sizeChange`](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/ITimeScaleApi#subscribesizechange) - `(event: CustomEvent<{ width: number; height: number }>) => void`

Use the `ref` property to get reference to a [`ITimeScaleApi`](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/ITimeScaleApi) instance.

Note: don't use `ChartOptions['timeScale']` and `<TimeScale>` component at the same time. This can lead to uncontrolled overwriting of options.

### Price scale

`<PriceScale>` - the component is a bindings to a certain price scale.
This component has to be nested inside chart component and requires an `id` property. Two price scales with the same `id` within the same chart result in undefined behaviour.

You can pass any option from [`PriceScaleOptions`](https://tradingview.github.io/lightweight-charts/docs/api/interfaces/PriceScaleOptions) as separate property.

Note: don't use `ChartOptions['leftPriceScale']'` or `ChartOptions['rightPriceScale']` or `ChartOptions['overlayPriceScale']` and `<PriceScale>` at the same time. This can lead to uncontrolled overwriting of options.

## Typescript
Package is written on TypeScript and transpiled to plain `*.js` and `*.svelte` files. Definition files (including `*.svelte.d.ts`) are provided with package. It is a good place to find list of available properties that can be passed to each component.

## Related projects

Need a wrapper for another framework? Check out my [lightweight-charts-react-wrapper](https://github.com/trash-and-fire/lightweight-charts-react-wrapper)

## Licence

MIT

Review the license [requirements](https://github.com/tradingview/lightweight-charts#license) for the required "attribution notice" in the Lightweight Chart Repository.