zoom.ts

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A lightweight TypeScript library for image zooming, as seen on Medium.

// repository documentation

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<p align="center">
  <a href="#readme"><img src="https://raw.githubusercontent.com/michaelbull/zoom.ts/master/assets/logo.png" alt="zoom.ts" width="478" height="178" /></a>
</p>
<p align="center">
  A lightweight TypeScript library for image zooming, as seen on <a href="https://medium.design/image-zoom-on-medium-24d146fc0c20">Medium</a>.
</p>
<p align="center">
  <a href="https://michaelbull.github.io/zoom.ts" rel="nofollow">Demo</a>
</p>
<p align="center">
  <a href="https://www.npmjs.com/package/zoom.ts"><img src="https://img.shields.io/npm/v/zoom.ts.svg?style=flat-square" alt="npm version" /></a>
  <a href="https://www.npmjs.com/package/zoom.ts"><img src="https://img.shields.io/npm/dt/zoom.ts.svg?style=flat-square" alt="npm downloads" /></a>
  <br />
  <a href="https://github.com/michaelbull/zoom.ts/blob/master/LICENSE"><img src="https://img.shields.io/github/license/michaelbull/zoom.ts.svg?style=flat-square" alt="software license" /></a>
  <a href="https://travis-ci.org/michaelbull/zoom.ts"><img src="https://img.shields.io/travis/michaelbull/zoom.ts.svg?style=flat-square" alt="build status" /></a>
</p>
<br />
<p align="center">
  <a href="https://michaelbull.github.io/zoom.ts"><img src="https://github.com/michaelbull/zoom.ts/raw/master/assets/example.gif" alt="example" width="888" height="595" /></a>
</p>
<br />
<br />

## Installation

Install the package via [npm][npm]:

```
npm install --save zoom.ts
```

## Usage

The [example directory][example] contains the code used to [demonstrate][demo]
an application with `zoom.ts` installed.

### Static Site

To integrate `zoom.ts` into a static site, import the [UMD][umd] module and
interface with the library via the global `window.zoom`. The snippet below
demonstrates linking the bundle (`dist/zoom.js`) and the stylesheet
(`dist/zoom.css`). It then calls the [`listen`][listen] function to add an
event listener to the `document.body` when the page is [`ready`][ready].

```html
<!DOCTYPE html>
<html>
  <head>
    <link rel="stylesheet" href="dist/zoom.css">
    <script type="text/javascript" src="dist/zoom.js"></script>
    <script>window.zoom.listen();</script>
  </head>

<body>
    <img
      class="zoom__image"
      src="tower.jpeg"
      data-width="2048"
      data-height="1366"
      data-src="tower-full.jpeg"
    />
  </body>
</html>
```

### Application

To integrate `zoom.ts` into a web application, follow the steps outlined below:

1. Detect and store the [`Features`][features] of the `document.body.style`
2. Locate the element you wish to make zoomable
3. Register a [`ZoomListener`][zoom-listener] on the target image
4. In the listener's callback, create and store a [`Zoom`][zoom] instance
5. Call `expand` on the `Zoom` instance to begin zooming the image
6. If the user navigates to a different page in the application, call [`destroy`][destroy] on the `Zoom` instance

The snippet below demonstrates finding the first element with the `zoom__image`
class and adding a `ZoomListener` to any `click` events it fires. When fired,
the event listener will create a `Zoom` instance and store it as a variable
named `zoom`, then immediately expand the image. After 5 seconds have passed,
the `zoom` will be forcefully removed via the call to `destroy`.

```javascript
import {
    detectFeatures,
    Zoom,
    ZoomDOM,
    ZoomListener
} from 'zoom.ts';

let features = detectFeatures(document.body.style); // (1)
let image = document.querySelector('.zoom__image'); // (2)

image.addEventListener('click', new ZoomListener(dom => { // (3)
    let zoom = new Zoom(dom, features); // (4)

zoom.expand(); // (5)

setTimeout(() => {
        zoom.destroy(); // (6)
    }, 5000);
}));
```

## Contributing

Bug reports and pull requests are welcome on [GitHub][github].

## License

This project is available under the terms of the ISC license. See the
[`LICENSE`](LICENSE) file for the copyright information and licensing terms.

[npm]: https://www.npmjs.com/
[example]: https://github.com/michaelbull/zoom.ts/tree/master/example
[demo]: https://michaelbull.github.io/zoom.ts
[umd]: https://github.com/umdjs/umd
[listen]: https://github.com/michaelbull/zoom.ts/blob/master/src/index.ts#L15
[ready]: https://github.com/michaelbull/zoom.ts/blob/master/src/browser/document.ts#L25
[features]: https://github.com/michaelbull/zoom.ts/blob/master/src/browser/features.ts#L5
[zoom-listener]: https://github.com/michaelbull/zoom.ts/blob/master/src/event/zoom-listener.ts#L11
[zoom]: https://github.com/michaelbull/zoom.ts/blob/master/src/zoom.ts#L19
[destroy]: https://github.com/michaelbull/zoom.ts/blob/master/src/zoom.ts#L72
[github]: https://github.com/michaelbull/zoom.ts

zoom.ts

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