@dschz/solid-uplot

💹 SolidJS wrapper for uPlot — an ultra-fast, small footprint charting library for time-series data.

✨ Features

• ✅ Fully reactive SolidJS wrapper around uPlot
• 🔌 Plugin system support with inter-plugin communication
• 🎯 Fine-grained control over chart lifecycle
• 💡 Lightweight and fast
• 💻 TypeScript support out of the box
• 🎨 Built-in plugins for tooltips, legends, cursor tracking, and series focusing
• 📱 Responsive sizing support with auto-resize capabilities

📦 Installation

npm install solid-js uplot @dschz/solid-uplot
pnpm install solid-js uplot @dschz/solid-uplot
yarn install solid-js uplot @dschz/solid-uplot
bun install solid-js uplot @dschz/solid-uplot

🎮 Live Demo

This repo ships with a live, running playground — a full showcase of every feature in the library. It's the fastest way to see solid-uplot in action and explore real, working examples of charts, plugins, responsive sizing, and external integrations.

Running the Playground

git clone https://github.com/dsnchz/solid-uplot.git
cd solid-uplot

# Install dependencies
bun install

# Start the playground
bun start

The playground runs at http://localhost:3000 and includes interactive demos for:

• All built-in plugins (cursor, tooltip, legend, focus series)
• Responsive and auto-resize chart patterns
• Custom plugin development
• External component integration via the plugin bus

📁 Package Structure

This package provides three main export paths for different functionality:

@dschz/solid-uplot

Core components and plugin system:

import { SolidUplot, createPluginBus } from "@dschz/solid-uplot";
import type {
  SolidUplotPluginBus,
  UplotPluginFactory,
  UplotPluginFactoryContext,
} from "@dschz/solid-uplot";

@dschz/solid-uplot/plugins

This export path provides four plugins (three of which can be considered primitives).

• cursor: transmits cursor position data
• focusSeries: transmits which series are visually emphasized
• tooltip: plugin that allows you to present a custom JSX tooltip around the cursor
• legend: plugin that allows you to present a custom JSX component as your legend over the canvas drawing area.

import { cursor, tooltip, legend, focusSeries } from "@dschz/solid-uplot/plugins";
import type {
  CursorPluginMessageBus,
  FocusSeriesPluginMessageBus,
  TooltipProps,
  LegendProps,
} from "@dschz/solid-uplot/plugins";

@dschz/solid-uplot/utils

Some convenience utility functions for getting certain bits of data from a uPlot instance (except for getColorString which translates a series' stroke or fill into a color value).

import {
  getSeriesData,
  getCursorData,
  getColorString,
  getNewCalendarDayIndices,
} from "@dschz/solid-uplot/utils";
import type { SeriesDatum, CursorData } from "@dschz/solid-uplot/utils";

🚀 Quick Start

import { SolidUplot, createPluginBus } from "@dschz/solid-uplot";
import { cursor, tooltip, legend } from "@dschz/solid-uplot/plugins";
import type { CursorPluginMessageBus, TooltipProps, LegendProps } from "@dschz/solid-uplot/plugins";

// Create a tooltip component
const MyTooltip = (props: TooltipProps) => (
  <div style={{ background: "white", padding: "8px", border: "1px solid #ccc" }}>
    <div>X: {props.cursor.xValue}</div>
    <For each={props.seriesData}>
      {(series) => {
        const value = props.u.data[series.seriesIdx]?.[props.cursor.idx];
        return (
          <div>
            {series.label}: {value}
          </div>
        );
      }}
    </For>
  </div>
);

// Create a legend component
const MyLegend = (props: LegendProps) => (
  <div style={{ background: "rgba(255,255,255,0.9)", padding: "8px" }}>
    <For each={props.seriesData}>
      {(series) => (
        <div style={{ display: "flex", "align-items": "center", gap: "4px" }}>
          <div
            style={{
              width: "12px",
              height: "12px",
              background: series.stroke,
            }}
          />
          <span>{series.label}</span>
        </div>
      )}
    </For>
  </div>
);

const MyChart = () => {
  const bus = createPluginBus<CursorPluginMessageBus>();

  return (
    <SolidUplot
      data={[
        [0, 1, 2, 3], // x values
        [10, 20, 30, 40], // y values for series 1
        [15, 25, 35, 45], // y values for series 2
      ]}
      width={600}
      height={400}
      series={[
        {},
        { label: "Series 1", stroke: "#1f77b4" },
        { label: "Series 2", stroke: "#ff7f0e" },
      ]}
      plugins={[
        cursor(),
        tooltip(MyTooltip),
        legend(MyLegend, { placement: "top-right", pxOffset: 12 }),
      ]}
      pluginBus={bus}
    />
  );
};

📏 Responsive Sizing

For responsive charts that automatically adapt to container size changes, use the autoResize prop:

<div style={{ width: "100%", height: "400px" }}>
  <SolidUplot
    autoResize={true}
    data={data}
    series={series}
    // Chart will automatically resize to fill the container
  />
</div>

For more advanced responsive patterns, you can pair this library with @dschz/solid-auto-sizer:

npm install @dschz/solid-auto-sizer
pnpm install @dschz/solid-auto-sizer
yarn install @dschz/solid-auto-sizer
bun install @dschz/solid-auto-sizer

import { AutoSizer } from "@dschz/solid-auto-sizer";

<AutoSizer>
  {({ width, height }) => <SolidUplot width={width} height={height} data={data} />}
</AutoSizer>;

Alternatively, you can use createElementSize from @solid-primitives/resize-observer for a signal-based approach:

npm install @solid-primitives/resize-observer

import { createElementSize } from "@solid-primitives/resize-observer";

const ResponsiveChart = () => {
  let container!: HTMLDivElement;
  const size = createElementSize(() => container);

  return (
    <div style={{ width: "100%", height: "400px" }}>
      <div ref={container} style={{ width: "100%", height: "100%" }}>
        <SolidUplot data={data} width={size.width ?? 0} height={size.height ?? 0} series={series} />
      </div>
    </div>
  );
};

🔌 Enhanced Plugin System

The cornerstone feature of SolidUplot is its refined plugin system that enables extensible functionality and inter-plugin communication through a reactive message bus.

Plugin Bus Architecture

The Plugin Bus System enables plugins to communicate with each other and external components through a reactive store. This architecture provides:

• Type-safe communication: All plugin messages are fully typed
• Reactive updates: Changes in plugin state automatically trigger updates
• Decoupled components: Plugins can interact without direct dependencies
• Extensible: Easy to add new plugins that integrate with existing ones

Built-in Plugins

Cursor Plugin

Tracks cursor position and interaction state across charts:

import { cursor } from "@dschz/solid-uplot/plugins";
import type { CursorPluginMessageBus } from "@dschz/solid-uplot/plugins";

const cursorPlugin = cursor();

The cursor plugin provides cursor position data that other plugins can consume through the bus.

Focus Series Plugin

Highlights series based on cursor proximity:

import { focusSeries } from "@dschz/solid-uplot/plugins";
import type { FocusSeriesPluginMessageBus } from "@dschz/solid-uplot/plugins";

const focusPlugin = focusSeries({
  pxThreshold: 15, // Distance threshold for focusing (default: 15)
});

Tooltip Plugin

Renders custom tooltips with automatic positioning and overflow handling:

import { tooltip } from "@dschz/solid-uplot/plugins";
import type { TooltipProps } from "@dschz/solid-uplot/plugins";

const MyTooltip: Component<TooltipProps> = (props) => {
  return (
    <div
      style={{
        background: "white",
        border: "1px solid #ccc",
        padding: "8px",
        "border-radius": "4px",
        "box-shadow": "0 2px 4px rgba(0,0,0,0.1)",
      }}
    >
      <div style={{ "font-weight": "bold", "margin-bottom": "8px" }}>X: {props.cursor.xValue}</div>
      <For each={props.seriesData}>
        {(series) => {
          const value = () => props.u.data[series.seriesIdx]?.[props.cursor.idx];
          return (
            <Show when={series.visible}>
              <div style={{ display: "flex", "align-items": "center", "margin-bottom": "4px" }}>
                <div
                  style={{
                    width: "10px",
                    height: "10px",
                    "border-radius": "50%",
                    "background-color": series.stroke,
                    "margin-right": "6px",
                  }}
                />
                <span style={{ color: series.stroke }}>
                  {series.label}: {value()?.toFixed(2)}
                </span>
              </div>
            </Show>
          );
        }}
      </For>
    </div>
  );
};

const tooltipPlugin = tooltip(MyTooltip, {
  placement: "top-left", // "top-left" | "top-right" | "bottom-left" | "bottom-right"
  zIndex: 20,
});

Legend Plugin

Adds customizable legends with smart positioning and interactive features:

import { legend } from "@dschz/solid-uplot/plugins";
import type { LegendProps } from "@dschz/solid-uplot/plugins";

const MyLegend: Component<LegendProps> = (props) => {
  // Access cursor data for interactive features
  const cursorVisible = () => props.bus.data.cursor?.state[props.u.root.id]?.visible;

  return (
    <div
      style={{
        background: "white",
        border: "1px solid #ddd",
        "border-radius": "4px",
        padding: "8px",
        "box-shadow": "0 2px 4px rgba(0,0,0,0.1)",
        // Dim when tooltip is active
        opacity: cursorVisible() ? 0.6 : 1,
        transition: "opacity 200ms",
      }}
    >
      <div style={{ "font-weight": "bold", "margin-bottom": "8px" }}>Legend</div>
      <For each={props.seriesData}>
        {(series) => (
          <Show when={series.visible}>
            <div
              style={{
                display: "flex",
                "align-items": "center",
                gap: "6px",
                "margin-bottom": "4px",
              }}
            >
              <div
                style={{
                  width: "12px",
                  height: "12px",
                  "background-color": series.stroke,
                  "border-radius": "2px",
                }}
              />
              <span style={{ "font-size": "14px" }}>{series.label}</span>
            </div>
          </Show>
        )}
      </For>
    </div>
  );
};

const legendPlugin = legend(MyLegend, {
  placement: "top-left", // "top-left" | "top-right"
  pxOffset: 8, // Distance from chart edges (default: 8)
  zIndex: 10,
});

Legend Plugin Features:

• Simple positioning: Only top-left or top-right corners to avoid axis conflicts
• Size-constrained: Legend cannot exceed chart drawing area dimensions
• Layout-agnostic: You control internal layout and styling
• Non-interfering: Designed to work harmoniously with chart interactions
• Plugin bus integration: Access cursor and focus data for smart interactions
• Automatic cleanup: Proper memory management and DOM cleanup

Plugin Bus Type Safety

When using multiple plugins, ensure type safety by properly typing the plugin bus:

import { createPluginBus } from "@dschz/solid-uplot";
import type {
  CursorPluginMessageBus,
  FocusSeriesPluginMessageBus,
} from "@dschz/solid-uplot/plugins";

// Create a bus that includes all plugin message types
const bus = createPluginBus<CursorPluginMessageBus & FocusSeriesPluginMessageBus>();

const MyChart = () => {
  return (
    <SolidUplot
      data={data}
      pluginBus={bus}
      plugins={[cursor(), focusSeries(), tooltip(MyTooltip), legend(MyLegend)]}
    />
  );
};

Creating Custom Plugins

The plugin system is open to extension. When authoring plugins for public consumption, follow this pattern:

import type { UplotPluginFactory } from "@dschz/solid-uplot";
import type { CursorPluginMessageBus } from "@dschz/solid-uplot/plugins";

// 1. Define your plugin's message type
export type MyPluginMessage = {
  value: number;
  timestamp: number;
};

// 2. Define your plugin's message bus
export type MyPluginMessageBus = {
  myPlugin?: MyPluginMessage;
};

// 3. Export your plugin factory
export const myPlugin = (
  options = {},
): UplotPluginFactory<CursorPluginMessageBus & MyPluginMessageBus> => {
  return ({ bus }) => {
    if (!bus) {
      console.warn("[my-plugin]: A plugin bus is required");
      return { hooks: {} };
    }

    return {
      hooks: {
        ready: (u) => {
          // Initialize plugin state
          bus.setData("myPlugin", {
            value: 0,
            timestamp: Date.now(),
          });
        },
        setData: (u) => {
          // Update plugin state
          bus.setData("myPlugin", "value", (prev) => prev + 1);
        },
      },
    };
  };
};

External Component Integration

The plugin bus enables powerful integrations between charts and external components:

import { createPluginBus } from "@dschz/solid-uplot";
import type { FocusSeriesPluginMessageBus } from "@dschz/solid-uplot/plugins";

const bus = createPluginBus<FocusSeriesPluginMessageBus>();

// External component that can trigger series focus
const DataGrid = (props: { bus: typeof bus }) => {
  const handleRowHover = (seriesLabel: string) => {
    props.bus.setData("focusSeries", {
      sourceId: "data-grid",
      targets: [{ label: seriesLabel }],
    });
  };

  return <table>{/* Grid implementation */}</table>;
};

// Chart and grid interact through shared bus
const MyDashboard = () => {
  return (
    <div>
      <DataGrid bus={bus} />
      <SolidUplot data={data} pluginBus={bus} plugins={[focusSeries()]} />
    </div>
  );
};

🔧 API Reference

SolidUplot Component

type SolidUplotEvents = {
  /** Callback fired when the uPlot instance is created */
  readonly onCreate?: (u: uPlot, meta: OnCreateMeta) => void;
  /** Callback fired when the cursor moves */
  readonly onCursorMove?: (params: OnCursorMoveParams) => void;
};

// Main component props (extends all uPlot.Options except plugins, width, height)
type SolidUplotProps<T extends VoidStruct = VoidStruct> = SolidUplotOptions<T> &
  SolidUplotEvents & {
    // Ref callback to access the chart container element
    ref?: Ref<HTMLDivElement>;

    // CSS class name for the chart container (default: "solid-uplot")
    // Additional classes will be appended to the default class
    class?: string;

    // CSS styles for the chart container (position is managed internally)
    style?: Omit<JSX.CSSProperties, "position">;

    // Enable automatic resizing to fit container (default: false)
    autoResize?: boolean;

    // Whether to reset scales when chart data is updated (default: true)
    resetScales?: boolean;

    // Where to place children components relative to the chart (default: "top")
    childrenPlacement?: "top" | "bottom";
  };

// Configuration options extending uPlot.Options with SolidJS enhancements
type SolidUplotOptions<T extends VoidStruct = VoidStruct> = Omit<
  uPlot.Options,
  "plugins" | "width" | "height"
> & {
  // Chart dimensions
  width?: number; // default: 600
  height?: number; // default: 300

  // Plugin configuration
  plugins?: SolidUplotPlugin<T>[];
  pluginBus?: SolidUplotPluginBus<T>;
};

// Plugin type (can be standard uPlot plugin or factory function)
type SolidUplotPlugin<T extends VoidStruct = VoidStruct> = uPlot.Plugin | UplotPluginFactory<T>;

Plugin Bus

// Plugin bus type (derived from createPluginBus return type)
type SolidUplotPluginBus<T extends VoidStruct = VoidStruct> = ReturnType<typeof createPluginBus<T>>;

// Create a plugin bus
const createPluginBus: <T extends VoidStruct = VoidStruct>(
  initialData?: T,
) => SolidUplotPluginBus<T>;

Built-in Plugin Options

// Cursor Plugin
const cursor = (): UplotPluginFactory<CursorPluginMessageBus>;

// Focus Series Plugin
const focusSeries = (options?: {
  pxThreshold?: number; // default: 15
}): UplotPluginFactory<CursorPluginMessageBus & FocusSeriesPluginMessageBus>;

// Tooltip Plugin
const tooltip = (
  Component: Component<TooltipProps>,
  options?: {
    placement?: "top-left" | "top-right" | "bottom-left" | "bottom-right";
    id?: string;
    class?: string;
    style?: JSX.CSSProperties;
    zIndex?: number; // default: 20
  }
): UplotPluginFactory<CursorPluginMessageBus & FocusSeriesPluginMessageBus>;

// Legend Plugin
const legend = (
  Component: Component<LegendProps>,
  options?: {
    placement?: "top-left" | "top-right"; // default: "top-left"
    pxOffset?: number; // default: 8
    id?: string;
    class?: string;
    style?: JSX.CSSProperties;
    zIndex?: number; // default: 10
  }
): UplotPluginFactory<CursorPluginMessageBus & FocusSeriesPluginMessageBus>;

📚 Examples

Basic Chart

import { SolidUplot } from "@dschz/solid-uplot";

const BasicChart = () => {
  return (
    <SolidUplot
      data={[
        [0, 1, 2, 3],
        [10, 20, 30, 40],
        [15, 25, 35, 45],
      ]}
      width={600}
      height={400}
      scales={{
        x: { time: false },
      }}
      series={[
        {},
        { label: "Series 1", stroke: "#1f77b4" },
        { label: "Series 2", stroke: "#ff7f0e" },
      ]}
    />
  );
};

Chart with All Plugins

import { SolidUplot, createPluginBus } from "@dschz/solid-uplot";
import { cursor, tooltip, legend, focusSeries } from "@dschz/solid-uplot/plugins";
import type {
  CursorPluginMessageBus,
  FocusSeriesPluginMessageBus,
  TooltipProps,
  LegendProps,
} from "@dschz/solid-uplot/plugins";

const MyTooltip: Component<TooltipProps> = (props) => (
  <div style={{ background: "white", padding: "8px", border: "1px solid #ccc" }}>
    <div>Time: {new Date(props.cursor.xValue * 1000).toLocaleTimeString()}</div>
    <For each={props.seriesData}>
      {(series) => {
        const value = props.u.data[series.seriesIdx]?.[props.cursor.idx];
        return (
          <div style={{ color: series.stroke }}>
            {series.label}: {value?.toFixed(2)}
          </div>
        );
      }}
    </For>
  </div>
);

const MyLegend: Component<LegendProps> = (props) => {
  const cursorVisible = () => props.bus.data.cursor?.state[props.u.root.id]?.visible;

  return (
    <div
      style={{
        background: "white",
        border: "1px solid #ddd",
        padding: "8px",
        opacity: cursorVisible() ? 0.6 : 1,
        transition: "opacity 200ms",
      }}
    >
      <For each={props.seriesData}>
        {(series) => (
          <div style={{ display: "flex", "align-items": "center", gap: "6px" }}>
            <div
              style={{
                width: "12px",
                height: "12px",
                background: series.stroke,
              }}
            />
            <span>{series.label}</span>
          </div>
        )}
      </For>
    </div>
  );
};

const FullFeaturedChart = () => {
  const bus = createPluginBus<CursorPluginMessageBus & FocusSeriesPluginMessageBus>();

  return (
    <SolidUplot
      data={[
        [0, 1, 2, 3, 4, 5],
        [10, 20, 30, 40, 50, 60],
        [15, 25, 35, 45, 55, 65],
        [5, 15, 25, 35, 45, 55],
      ]}
      width={800}
      height={500}
      series={[
        {},
        { label: "Revenue", stroke: "#1f77b4" },
        { label: "Profit", stroke: "#ff7f0e" },
        { label: "Expenses", stroke: "#2ca02c" },
      ]}
      plugins={[
        cursor(),
        focusSeries({ pxThreshold: 20 }),
        tooltip(MyTooltip, { placement: "top-right" }),
        legend(MyLegend, { placement: "top-left", pxOffset: 12 }),
      ]}
      pluginBus={bus}
    />
  );
};

Responsive Chart

const ResponsiveChart = () => {
  return (
    <div style={{ width: "100%", height: "400px", border: "1px solid #ccc" }}>
      <SolidUplot
        autoResize={true}
        data={data}
        series={series}
        plugins={[cursor(), tooltip(MyTooltip)]}
      />
    </div>
  );
};

External Integration

const Dashboard = () => {
  const bus = createPluginBus<FocusSeriesPluginMessageBus>();

  const handleSeriesToggle = (seriesLabel: string) => {
    bus.setData("focusSeries", {
      sourceId: "external-control",
      targets: [{ label: seriesLabel }],
    });
  };

  return (
    <div>
      <div>
        <button onClick={() => handleSeriesToggle("Series 1")}>Focus Series 1</button>
        <button onClick={() => handleSeriesToggle("Series 2")}>Focus Series 2</button>
      </div>
      <SolidUplot data={data} plugins={[focusSeries()]} pluginBus={bus} />
    </div>
  );
};

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Also check out the Discord community.

📄 License

MIT