@samvera/image-downloader

JavaScript modules and a convenience React component which will force a jpeg download of an image URL. Built for the use case of needing to offer JPG downloads for images hosted via a IIIF image server.

Getting Started

Install the package:

npm install @samvera/image-downloader

Usage

Import JavaScript modules into your project to use directly:

import { makeBlob, mimicDownload } from "@samvera/image-downloader";

var url =
  "https://iiif.stack.rdc.library.northwestern.edu/iiif/2/8f7bf326-e71d-4b6f-abb8-f6a40f412883/full/3000,/0/default.jpg";

// HTML or JSX file
<button
  onClick={async () => {
    let response = await makeBlob(url);

    // Handle any errors
    if (!response || response.error) {
      // Customize this for your app
      alert("Error fetching the image");

      return;
    }

    mimicDownload(response, "your-jpg-title");
  }}
>
  Download me
</button>;

Customizing makeBlob() requests

The makeBlob() function utilizes fetch() for requests. You can chose to customize the options object.

makeBlob(url, { credentials: "include" });

React

If importing into a React project, you can import the component directly:

import { ImageDownloader } from "@samvera/image-downloader";

<ImageDownloader
  imageUrl={`https://your-image-url`}
  imageTitle={`Beautiful image`}
>
  Download JPEG
</ImageDownloader>;

For complete props and usage examples, view the docs

Customizing

You can customize the look and feel of the button. View the docs

Authors

• Adam J. Arling - UI Developer - Northwestern Univeristy Libraries Github

Built With

• React - JavaScript component library
• Rollup - Rollup JavaScript bundler
• Jest - Testing framework
• Styleguidist - Local dev environment & documentation

License

This project is licensed under the MIT License - see the LICENSE.md file for details