redux-geojson

By: TannerGeo

This example module uses the Redux methodology to build a reducer that allows for the addition and removal of features features from a GeoJSON object.

Using Redux to manipulate a GeoJSON object can be helpful to enable undo and redo capabilities when manipulating map features. Since Redux stores every state in an immutable object, you can trust that each step of adding and removing features is preserved.

There are two main actions types to work with the reducer, preferably from a Redux store: ADD_FEATURE and REMOVE_FEATURE `

Example Adding a Feature

var store = createStore(geojson);

store.dispatch({
  type: 'ADD_FEATURE',
  geometry: {"type": "Point", "coordinates": [0, 1]},
  properties: {"prop0": "value0"}
});

Example Removing a Feature

var initialState = {
  type : 'FeatureCollection',
  features : [
    { "type": "Feature",
      "geometry": {"type": "Point", "coordinates": [0, 1]},
      "properties": {"prop0": "value0"}
    },
    { "type": "Feature",
      "geometry": {"type": "Point", "coordinates": [1, 2]},
      "properties": {"prop1": "value1"}
    },
    { "type": "Feature",
      "geometry": {"type": "Point", "coordinates": [3, 4]},
      "properties": {"prop2": "value2"}
    }
  ]
};

var store = createStore(geojson, geojsonBefore);

store.dispatch({
  type: 'DELETE_FEATURE',
  index: 1
});

To test the module

npm install
npm test

This module was created for learning purposes, but can easily be modified to support additional actions and implemented into a larger project.

MIT License

Copyright (c) 2016 TannerGeo

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.