htmldl

htmldl is a lightweight and customizable utility for exporting DOM nodes as images (PNG, JPEG, or SVG) in React applications. It is built on top of the html-to-image library, providing an easy-to-use API to generate high-quality images from any HTML content.

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Installation

Install the package using npm or bun:

npm install htmldl

or

bun add htmldl

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Features

• 🌟 Multi-Format Support: Export DOM nodes as PNG, JPEG, or SVG.
• 🖼️ Custom Quality and Scale: Adjust image resolution and quality to your needs.
• 🎨 Background Color Support: Add custom backgrounds to your exports.
• 📂 Customizable File Names: Specify the name of the downloaded image file.
• 🔄 Callbacks: Optional hooks for handling download completion or errors.
• 🚀 Easy to Use: Seamless integration with React and modern browsers.

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Example Usage

Code Example

Below is an example of how you can use htmldl in your React project:

import { useCallback, useRef } from "react";
import { downloadNodeAsImage } from "htmldl";

function App() {
  const printRef = useRef<HTMLDivElement>(null);

  const handleDownload = useCallback(async () => {
    if (!printRef.current) return;

    await downloadNodeAsImage(printRef.current, {
      fileName: "example-download",
      format: "jpeg",
      quality: 0.9,
      scale: 2,
      backgroundColor: "#ffffff",
      onDownloadComplete: () => alert("Download complete!"),
      onError: (error) => console.error("Download failed:", error),
    });
  }, []);

  return (
    <main>
      <div>
        <div ref={printRef}>
          <h1>htmldl Example</h1>
          <p>
            Export this content as an image by clicking the download button
            below.
          </p>
        </div>
      </div>

      <button onClick={handleDownload}>Download as Image</button>
    </main>
  );
}

export default App;

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API

downloadNodeAsImage(node: HTMLElement, options?: ExportOptions): Promise<void>

Converts a DOM node to an image and triggers a download.

Parameters:

1. node (required): The DOM element you want to capture.
2. options (optional): An object to customize the export process.

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Options

Option	Type	Default	Description
fileName	string	"download"	Name of the downloaded file.
format	"png" | "jpeg" | "svg"	"png"	Format of the downloaded image.
quality	number	1	JPEG quality (0 to 1).
scale	number	1	Scale factor for resolution.
backgroundColor	string	undefined	Background color for the image (e.g., "#ffffff").
onDownloadComplete	() => void	undefined	Callback executed after the download completes.
onError	(error: Error) => void	undefined	Custom error handler, invoked when an error occurs.

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Example with Custom Options

await downloadNodeAsImage(printRef.current, {
  fileName: "custom-image",
  format: "svg",
  scale: 3,
  backgroundColor: "#ff0000",
  onDownloadComplete: () => console.log("Export complete!"),
  onError: (err) => console.error("Export failed:", err),
});

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Under the Hood

htmldl uses the following utility methods from html-to-image to generate images:

• toPng: Converts a node to a PNG image.
• toJpeg: Converts a node to a JPEG image.
• toSvg: Converts a node to an SVG image.

The triggerDownload function automatically creates a download link for the generated image.

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Requirements

• React: Version 16.8+ (requires hooks support).
• Works seamlessly in modern browsers.

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Contributing

We welcome contributions! If you encounter any issues or have ideas for improvements, feel free to open an issue or submit a pull request.

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Start using htmldl today and make exporting your DOM content as images a breeze! 🎉