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To improve the usability of these stations, preferred operators will be explained in the next step.",{"type":472,"tag":678,"props":679,"children":681},"div",{"className":680},[498],[682],{"type":472,"tag":683,"props":684,"children":689},"ct-code-tabs",{":codeList":685,":is-inversed":517,"className":686},"[{\"label\":\"client.js\",\"code\":\"import { createClient, createRequest, defaultExchanges, subscriptionExchange } from '@urql/core';\\nimport { pipe, subscribe } from 'wonka';\\nimport { SubscriptionClient } from 'subscriptions-transport-ws';\\nimport { createRouteQuery, routeUpdateSubscription } from './queries.js';\\n\\n/**\\n * Example application of how to build a route with the Chargetrip API.\\n * This route will show alternative stations along the route.\\n * Please have a look to Readme file in this repo for more details.\\n *\\n * For the purpose of this example we use urgl - lightweights GraphQL client.\\n * To establish a connection with Chargetrip GraphQL API you need to have an API key.\\n * The key in this example is a public one and gives access only to a part of our extensive database.\\n * You need a registered `x-client-id` to access the full database.\\n * Read more about an authorisation in our documentation (https://docs.chargetrip.com/#authorisation).\\n */\\nconst headers = {\\n  //Replace this x-client-id and app-id with your own to get access to more cars\\n  'x-client-id': '5ed1175bad06853b3aa1e492',\\n  'x-app-id': '623998b2c35130073829b2d2',\\n};\\n\\nconst subscriptionClient = new SubscriptionClient('wss://api.chargetrip.io/graphql', {\\n  reconnect: true,\\n  connectionParams: headers,\\n});\\n\\nconst client = createClient({\\n  url: 'https://api.chargetrip.io/graphql',\\n  fetchOptions: {\\n    method: 'POST',\\n    headers,\\n  },\\n  exchanges: [\\n    ...defaultExchanges,\\n    subscriptionExchange({\\n      forwardSubscription(operation) {\\n        return subscriptionClient.request(operation);\\n      },\\n    }),\\n  ],\\n});\\n\\n/**\\n * To create a route you need:\\n *\\n * 1. Create a new route and receive back its ID;\\n * 2. Subscribe to route updates in order to receive its details.\\n */\\nexport const getRoute = callback => {\\n  client\\n    .mutation(createRouteQuery)\\n    .toPromise()\\n    .then(response => {\\n      const routeId = response.data.newRoute;\\n      if (!routeId) return Promise.reject('Could not retrieve Route ID. The response is not valid.');\\n\\n      const { unsubscribe } = pipe(\\n        client.executeSubscription(createRequest(routeUpdateSubscription, { id: routeId })),\\n        subscribe(result => {\\n          const { status, route } = result.data?.routeUpdatedById;\\n\\n          // you can keep listening to the route changes to update route information\\n          // for this example we want to only draw the initial route\\n          if (status === 'done' && route) {\\n            unsubscribe();\\n            callback(route);\\n          }\\n        }),\\n      );\\n    })\\n    .catch(error => console.log(error));\\n};\\n\"},{\"label\":\"index.js\",\"code\":\"import { getRoute } from './client.js';\\nimport { attachEventListeners, renderRouteHeader } from './interface.js';\\nimport { drawRoutePolyline } from './map.js';\\n\\n/**\\n * This project shows you how to fetch a car list and render the car details\\n * The project structure contains;\\n *\\n *    - client.js - All networking requests\\n *    - interface.js - All interface rendering\\n *    - map.js - All map rendering (including routes and waypoints)\\n *    - queries.js - The GraphQL queries used in the networking requests\\n */\\n\\ngetRoute(routeData => {\\n  drawRoutePolyline(routeData);\\n  renderRouteHeader(routeData);\\n  attachEventListeners(routeData);\\n});\\n\"},{\"label\":\"interface.js\",\"code\":\"import { getDurationString } from '../../../utils';\\nimport { hideAlternatives, showAlternatives } from './map';\\n\\nlet routeData;\\n\\n/**\\n * Function that renders the header details\\n * @param { object } data - All available route data\\n */\\nexport const renderRouteHeader = data => {\\n  const routeDistance = data.distance ? `${(data.distance / 1000).toFixed(0)} km` : 'Unknown';\\n  const routeStops = `${data.charges ?? 0} stops`;\\n  const routeEnergy = data.consumption ? `${data.consumption.toFixed(2)} kWh` : 'Unknown';\\n\\n  document.getElementById('duration').innerHTML = `${getDurationString(data.duration ?? 0)}`;\\n  document.getElementById('route-metadata').innerHTML = `${routeDistance} / ${routeStops} / ${routeEnergy}`;\\n};\\n\\n/**\\n * Small helper that attaches an event listener to the stations along route switch\\n * @param { object } data - All available route data including stations along the route\\n */\\nexport const attachEventListeners = data => {\\n  routeData = data;\\n  document.getElementById('stations-along-route').addEventListener('input', didToggleSwitch);\\n};\\n\\nconst didToggleSwitch = event => {\\n  event.preventDefault();\\n\\n  const numberOfStations = document.getElementById('number-of-stations');\\n  const alternatives = routeData.stationsAlongRoute ?? [];\\n\\n  if (event.target.checked) {\\n    numberOfStations.innerHTML = alternatives.length;\\n    showAlternatives(alternatives);\\n  } else {\\n    numberOfStations.innerHTML = '-';\\n    hideAlternatives();\\n  }\\n};\\n\"},{\"label\":\"map.js\",\"code\":\"import mapboxgl from 'mapbox-gl';\\nimport * as mapboxPolyline from '@mapbox/polyline';\\n\\nmapboxgl.accessToken = 'pk.eyJ1IjoiY2hhcmdldHJpcCIsImEiOiJjazhpaG8ydTIwNWNpM21ud29xeXc2amhlIn0.rGKgR3JfG9Z5dCWjUI_oGA';\\n\\nexport const map = new mapboxgl.Map({\\n  cooperativeGestures: true,\\n  container: 'map',\\n  style: 'mapbox://styles/chargetrip/ckgcbf3kz0h8819qki8uwhe0k',\\n  zoom: 6,\\n  center: [9.1320104, 54.9758916],\\n});\\n\\n/**\\n * Draw a route on a map.\\n *\\n * Route object contains `polyline` data -  the polyline encoded route (series of coordinates as a single string).\\n * We need to decode this information first. We use Mapbox polyline tool (https://www.npmjs.com/package/@mapbox/polyline) for this.\\n * As a result of decoding we get pairs [latitude, longitude].\\n * To draw a route on a map we use Mapbox GL JS. This tool uses the format [longitude,latitude],\\n * so we have to reverse every pair.\\n *\\n * @param data {object} route specification\\n */\\nexport const drawRoutePolyline = data => {\\n  const decodedData = mapboxPolyline.decode(data.polyline);\\n  const reversed = decodedData.map(item => item.reverse());\\n\\n  drawRoute(reversed, data.legs);\\n};\\n\\n/**\\n * Draw route polyline and show charging stations on the map.\\n *\\n * @param coordinates {array} Array of coordinates\\n * @param legs {array} route legs (stops) - each leg represents either a charging station, or via point or final point\\n */\\nconst drawRoute = (coordinates, legs) => {\\n  if (map.loaded()) {\\n    drawPolyline(coordinates);\\n    showLegs(legs);\\n  } else {\\n    map.on('load', () => {\\n      drawPolyline(coordinates);\\n      showLegs(legs);\\n    });\\n  }\\n};\\n\\n/**\\n * Draw route polyline on a map.\\n *\\n * @param coordinates {array} polyline coordinates\\n */\\nconst drawPolyline = coordinates => {\\n  const geojson = {\\n    type: 'FeatureCollection',\\n    features: [\\n      {\\n        type: 'Feature',\\n        geometry: {\\n          type: 'LineString',\\n          properties: {},\\n          coordinates,\\n        },\\n      },\\n    ],\\n  };\\n\\n  map.addSource('polyline-source', {\\n    type: 'geojson',\\n    data: geojson,\\n  });\\n\\n  map.addLayer({\\n    id: 'polyline',\\n    type: 'line',\\n    options: 'beforeLayer',\\n    source: 'polyline-source',\\n    layout: {\\n      'line-join': 'round',\\n      'line-cap': 'round',\\n    },\\n    paint: {\\n      'line-color': '#0078FF',\\n      'line-width': 3,\\n    },\\n  });\\n};\\n\\n/**\\n * Show the charging station, origin and destination on the map.\\n *\\n * The origin of the first leg is the start of your route.\\n * The destination of the last is the destination of your route.\\n * The desitinatation of all other legs are charging stations or via points.\\n *\\n * @param legs {array} route legs\\n */\\nconst showLegs = legs => {\\n  if (legs.length === 0) return;\\n\\n  let points = [];\\n\\n  // we want to show origin point on the map\\n  // to do that we use the origin of the first leg\\n  points.push({\\n    type: 'Feature',\\n    properties: {\\n      icon: 'location_big',\\n    },\\n    geometry: legs[0].origin?.geometry,\\n  });\\n\\n  for (let i = 0; i \u003C legs.length; i++) {\\n    // add charging stations\\n    if (i !== legs.length - 1) {\\n      points.push({\\n        type: 'Feature',\\n        properties: {\\n          icon: 'free-turbo',\\n        },\\n        geometry: legs[i].destination?.geometry,\\n      });\\n    } else {\\n      // add destination point (last leg)\\n      points.push({\\n        type: 'Feature',\\n        properties: {\\n          icon: 'arrival',\\n        },\\n        geometry: legs[i].destination?.geometry,\\n      });\\n    }\\n  }\\n\\n  // draw route points on a map\\n  map.addLayer({\\n    id: 'legs',\\n    type: 'symbol',\\n    layout: {\\n      'icon-image': '{icon}',\\n      'icon-allow-overlap': true,\\n      'icon-ignore-placement': true,\\n      'icon-offset': ['case', ['==', ['get', 'icon'], 'location_big'], ['literal', [0, 0]], ['literal', [0, -15]]],\\n    },\\n    source: {\\n      type: 'geojson',\\n      data: {\\n        type: 'FeatureCollection',\\n        features: points,\\n      },\\n    },\\n  });\\n};\\n\\n/**\\n * Icon for the charging station differs base on the speed (slow, fast, turbo),\\n * and status(available, busy, unkown or broken).\\n * If a charging station has multiple speeds the fastest speed will be shown.\\n * @param station {object} Station data\\n */\\nconst selectPinlet = station => `along-${station.speed}`;\\n\\nexport const showAlternatives = alternatives => {\\n  if (alternatives.length === 0) return;\\n\\n  const locations = alternatives.map(station => {\\n    return {\\n      type: 'Feature',\\n      properties: {\\n        icon: selectPinlet(station),\\n      },\\n      geometry: station.location,\\n    };\\n  });\\n\\n  // draw route points on a map\\n  map.addLayer({\\n    id: 'stations-along-route',\\n    type: 'symbol',\\n    layout: {\\n      'icon-image': '{icon}',\\n      'icon-allow-overlap': true,\\n    },\\n    source: {\\n      type: 'geojson',\\n      data: {\\n        type: 'FeatureCollection',\\n        features: locations,\\n      },\\n    },\\n  });\\n};\\n\\nexport const hideAlternatives = () => {\\n  if (map.getLayer('stations-along-route') && map.getSource('stations-along-route')) {\\n    map.removeLayer('stations-along-route');\\n    map.removeSource('stations-along-route');\\n  }\\n};\\n\"},{\"label\":\"queries.js\",\"code\":\"import qql from 'graphql-tag';\\n\\n/*\\n * In this example we request a route from Hanover, Germany to Aalborg, Denmark\\n * Your origin and destination are required fields. You also need to select an EV.\\n * Only the EV ID here is mandatory, all other fields are optional and when not specified will use the default values.\\n * The changing conditions are:\\n *   - full battery at Hanover, Germany\\n *   - EV can charge at CHAdeMO changers\\n *   - should use climate (temperature and weather conditions)\\n *   - one passenger in the car (drive alone)\\n *   - stations along the route radius is 2km\\n */\\nexport const createRouteQuery = qql`\\nmutation newRoute{\\n    newRoute(\\n      input: {\\n        ev: {\\n          id: \\\"5d161be5c9eef46132d9d20a\\\"\\n          battery: {\\n            stateOfCharge: { value: 45.5, type: kwh }\\n          }\\n          plugs: { chargingPower: 150, standard: TESLA_S }\\n          adapters: [\\n            { chargingPower: 150, standard: IEC_62196_T2_COMBO }\\n            { chargingPower: 150, standard: CHADEMO }\\n          ]\\n          climate: true\\n          numberOfPassengers: 1\\n        }\\n        routeRequest: {\\n          origin: {\\n            type: Feature\\n            geometry: { type: Point, coordinates: [9.732625731357011, 52.3806314590276] }\\n            properties: { name: \\\"Hanover, Germany\\\" }\\n          }\\n          destination: {\\n            type: Feature\\n            geometry: { type: Point, coordinates: [9.922192327081783, 57.046057998779176] }\\n            properties: { name: \\\"Aalborg, Denmark\\\" }\\n          }\\n          stationsAlongRouteRadius: 2000\\n        }\\n      }\\n    )\\n  }\\n`;\\n\\nexport const routeUpdateSubscription = qql`\\nsubscription routeUpdatedById($id: ID!){\\n  routeUpdatedById(id: $id) {\\n    status\\n    route {\\n      distance\\n      duration\\n      consumption\\n      polyline\\n      charges\\n      legs{\\n        distance\\n        origin{\\n          geometry{\\n            type\\n            coordinates\\n          }\\n        }\\n        destination{\\n          geometry\\n          {\\n            type\\n            coordinates\\n          }\\n        }\\n      }\\n      stationsAlongRoute{\\n        location{\\n          type\\n          coordinates\\n        }\\n        speed\\n        status\\n      }\\n    }\\n  }\\n}\\n`;\\n\"}]",[687,688],"stick","top-6",[],{"title":464,"searchDepth":691,"depth":691,"links":692},2,[],"markdown","content:5.examples:3.routes:4.stations-along-route.md","content","5.examples/3.routes/4.stations-along-route.md","md",1775054263146]