berliner-winter/static/js/main.js

'use strict';
import $ from 'jquery';
import filter from './filter';
import {mixColors} from './colors';

// http://www.colourlovers.com/palette/1811244/1001_Stories
var colors = [ '#F8B195', '#F67280', '#C06C84', '#6C5B7B', '#355C7D' ];

// set up background map
var map = L.map('map').setView([52.50, 13.40], 11);
var layer = new L.StamenTileLayer('toner-lite');
map.addLayer(layer);

// restrict viewable area
map.setMaxBounds(map.getBounds());
map.options.minZoom = map.getZoom();

// get response from server and draw the map
var response;
$.getJSON('/articles/')
  .fail(console.error.bind(console))
  .then(function (data) {
    console.log('Got data successfully!');
    response = data;

    displayMarkers(response);
  });

// event handling / user interaction
var $categoryList = $('.category-filter');

function getActiveCategories ($li) {
  var activeCategories = [];
  $categoryList.children().each(function () {
    var $li = $(this);
    if ($li.hasClass('active'))
      activeCategories.push($li[0].classList[0])
  });

  return activeCategories;
}

$categoryList.on('click', 'a', function (e) {
  $(this).parent().toggleClass('active');

  var categories = getActiveCategories();
  var incidents = filter.categories(reponse, categories);
  displayMarkers(incidents);

  e.preventDefault();
  e.stopPropagation();
  return false;
})

// logic for drawing follows

var markers = [];
function createMarker (data) {
  var options =  { color: pickColor(data) };
  var marker = L.circleMarker([data.lat, data.lng], options).addTo(map);
  return marker;
}

function pickColor (incident) {
  var categories = ['racism', 'antisemitism', 'sexism', 'homophobia'].map(function (category, index) {
    if (incident.categories.indexOf(category) !== -1)
      return index;
  }).filter(function (value) {
    return value != null
  });

  var categoryColors = colors.filter(function (color, index) {
    return categories.indexOf(index) !== -1;
  });

  return incident.categories.length ? mixColors(categoryColors) : colors[4];
}

/**
 * Clear the map and render new markers
 * @param  {Array[Object]} incidents The incidents to be shown
 */
function displayMarkers (incidents) {
  markers.forEach(function (marker) {
    map.removeLayer(marker);
  });
  markers = [];

  incidents.forEach(function (incident) {
    markers.push(createMarker(incident).bindPopup(incident.description));
  });
}