### OSM Changeset Viewer on a GL Map

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![](https://cloud.githubusercontent.com/assets/126868/24163445/a88728d4-0e90-11e7-9d02-d755b7845c00.png)

Changeset viewer module for [osmcha.org](https://osmcha.org/) ([Example](https://osmlab.github.io/changeset-map/#110574164), [Github](https://github.com/mapbox/osmcha-frontend)).

Pass a changeset id to render details of changes made by that changeset on a MapboxGL map.

Heavily inspired by the ACHAVI Changeset Viewer ([Example](https://overpass-api.de/achavi/?changeset=110574164), [Github](https://github.com/nrenner/achavi)).

### Use as a module

Create a container div to hold the UI.

```html
<div id='container'></div>
```

```js
// es6 modules
import {getChangeset, query, propsDiff, render} from 'changeset-map';

// commonjs
var changesetMap = require('changeset-map');
var render = changesetMap.render;

var container = document.getElementById('container');
var changesetMapControl = render(container, changesetID, { width: '1000px', height: '1000px' });

// binding events
changesetMapControl.on('load', function () {
    changesetMapControl.emit('selectFeature', 'node|way', featureId);
    changesetMapControl.emit('clearFeature');
    changesetMapControl.on('hashchange', function(geometryType, featureId) {
        // update hash.
    });
})
```

For a custom overpass instance, set a `overpassBase` key in the options object. Default instance is https://overpass.osmcha.org/api/interpreter.

### Build

 - Build the plugin by `npm run build`.
 - Build the website by `npm run build:website`, the websites html can be found in `public` folder. The javascript code to run changeset map can be found in `www` folder.

### Development

 - Install [asdf version manager](https://asdf-vm.com/guide/getting-started.html#getting-started)
 - `asdf install` # To install the required tools from [.tool-versions](./.tool-versions)
 - `yarn add react react-dom` # Install those packages manually
 - `yarn install` # Install packages
 - `yarn start` # To get going …