Question

In: Computer Science

Following is the activity of javascript. i have tried to do it but got stuck from...

Following is the activity of javascript. i have tried to do it but got stuck from question 3, I have also attached my javascript code right after the HTML file. can you please help me. Inside the java script code, it contains all the necessary token. if you run the html file, it will display longitude as a AQI so need to fix that.

Web Services Activity (1%)

You need to sign up to the API to obtain a key/token at WAQI API [link]

You should save the files as w9-webservices.js and w9-webservices.html

We would like to display the AQI information around the current user's geoposition on a map.

Instructions:

  1. When the page loads, get the user's current location using the Geolocation API's getCurrentPosition method. You should use a callback function.
    Display an appropriate error message as required if geolocation fails to get a position.
  2. In the callback function from (1), you should display a map centered at the current coordinates, with an appropriate zoom level.
  3. Obtain the map coordinate boundaries using MapBox's map.getBounds() method.
  4. Using the map boundary data, make a call to the AQI Map Query API [link: https://aqicn.org/json-api/doc/#api-Map_Queries-GetMapStations ] . You should use a callback function for this API call. The URL (with query string and :placeholders) looks like this: https://api.waqi.info/map/bounds/?token=:token&latlng=:latlng&callback=:callback
  5. In the callback function from (4), display a Marker and associated Popup for each location within the boundary coordinate data from (3). If no data is returned, display an appropriate error message.

    You should ensure that the Marker used is of an appropriate color depending on the AQI value (see table below).

    The Popup should display the AQI value and the station name in plain black text.

    AQI range

    Colour

    0 -- 50

    Green

    51 -- 100

    Yellow

    101 -- 150

    Orange

    151 -- 200

    Red

    201 -- 300

    Purple

    301 -- 500

    Maroon
  6. We can detect when the user changes the zoom level using: 
    map.on('zoomend',function(){
    // run some code if the zoom changes
});
    When the user changes the zoom (and thus the map boundaries change), you should update the map information by running (3) -> (5) again.

Notes:

  • You can add CSS inline or to the header section

Here's some code to get you started with the HTML page:

<html>
<head>
  <meta charset="utf-8">
  <title>Week 9 Web Services Activity</title>
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
  <!-- Import MDL libraries -->
  <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
  <link rel="stylesheet" href="https://code.getmdl.io/1.3.0/material.indigo-pink.min.css">
  <script defer src="https://code.getmdl.io/1.3.0/material.min.js"></script>
  <!-- Import Mapbox libraries -->
  <script src="https://api.mapbox.com/mapbox-gl-js/v1.7.0/mapbox-gl.js"></script>
  <link href="https://api.mapbox.com/mapbox-gl-js/v1.7.0/mapbox-gl.css" rel="stylesheet" />
  <style>
    /* Define any CSS here */
    #map { width: 80vw; height: 80vh }
  </style>
</head>
<body>
  <div class="mdl-layout mdl-js-layout mdl-layout--fixed-header">
    <header class="mdl-layout__header">
      <div class="mdl-layout__header-row"> <span class="mdl-layout__title">Check the air quality on the map</span> </div>
    </header>
    <main class="mdl-layout__content">
      <div class="mdl-grid">
        <div class="mdl-cell mdl-cell--8-col"> 
          <!-- Map div -->
          <div id='map'>
                    </div>
        </div>
      </div>
    </main>
  </div>
  <script src="w9-webservices.js"></script>
</body>
</html>

w9-webservices.js

"use strict";

// mapbox token

const MAPBOX_TOKEN = "pk.eyJ1IjoidGVlZSIsImEiOiJja2c2ODQ0cHQxMXUwMnJsZDJyOTY5YXRvIn0.0yh14c1R35E-dxvvAC1nxw";

// WAQI token

const WAQI_TOKEN = "4e4ff5b84906529e3768ed72754304c9057587c1";

navigator.geolocation.getCurrentPosition((position) => {

doSomething(position.coords.latitude, position.coords.longitude);

});

function doSomething(lat,lng){

console.log(lat,lng);

mapboxgl.accessToken = MAPBOX_TOKEN;

let map = new mapboxgl.Map({

container: 'map',

style: 'mapbox://styles/mapbox/streets-v9', // stylesheet location

center: [lng,lat], // starting position [lng, lat]

zoom: 13 // starting zoom

}) ;

map.setCenter([lng,lat]);

let marker = new mapboxgl.Marker({ "color": "#FF8C00" });

marker.setLngLat([lng,lat]);

let popup = new mapboxgl.Popup({ offset: 45});

let desc = `AQI: ${lng}`; // at the moment i have just used AQI value as a lngitude.

popup.setHTML(desc);

marker.setPopup(popup)

marker.addTo(map);

popup.addTo(map);

}

Solutions

Expert Solution

Hello There!

Here is the solution for your js activity.

Hope it helps!

Thumbsup ;)

w9-webservices.html

<html>
  <head>
    <meta charset="utf-8" />
    <title>Week 9 Web Services Activity</title>
    <meta
      name="viewport"
      content="initial-scale=1,maximum-scale=1,user-scalable=no"
    />
    <!-- Import MDL libraries -->
    <link
      rel="stylesheet"
      href="https://fonts.googleapis.com/icon?family=Material+Icons"
    />
    <link
      rel="stylesheet"
      href="https://code.getmdl.io/1.3.0/material.indigo-pink.min.css"
    />
    <script defer src="https://code.getmdl.io/1.3.0/material.min.js"></script>
    <!-- Import Mapbox libraries -->
    <script src="https://api.mapbox.com/mapbox-gl-js/v1.7.0/mapbox-gl.js"></script>
    <link
      href="https://api.mapbox.com/mapbox-gl-js/v1.7.0/mapbox-gl.css"
      rel="stylesheet"
    />
    <style>
      /* Define any CSS here */
      #map {
        width: 80vw;
        height: 80vh;
      }
      #marker {
        width: 18px;
        height: 18px;
        border-radius: 30%;
        cursor: pointer;
      }

      .mapboxgl-popup {
        max-width: 200px;
      }
    </style>
  </head>
  <body>
    <div class="mdl-layout mdl-js-layout mdl-layout--fixed-header">
      <header class="mdl-layout__header">
        <div class="mdl-layout__header-row">
          <span class="mdl-layout__title"
            >Check the air quality on the map</span
          >
          <h5 id="error" style="background-color: brown"></h5>
        </div>
      </header>
      <main class="mdl-layout__content">
        <div class="mdl-grid">
          <div class="mdl-cell mdl-cell--8-col">
            <!-- Map div -->
            <div id="map"></div>
          </div>
        </div>
      </main>
    </div>
    <script src="w9-webservices.js"></script>
  </body>
</html>

w9-webservices.js

var x = document.getElementById("error");
var lat;
var lon;




getLocation(); //calling the function initially

function getLocation() {
  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(showPosition);
  } else {
    x.innerHTML = "some error occured in the browser.";
  }
}

//callback function for above function
function showPosition(position) {
  //setting map with current location
  lat = position.coords.latitude;
  lon = position.coords.longitude;
  console.log(lat, lon);

  mapboxgl.accessToken =
    "pk.eyJ1IjoibmlraGlsbmFnYXIiLCJhIjoiY2tnZXM3MzUxMGNvaDJxcGZiMm01MWo1aiJ9.wKjHS-PJlAUmlItq5X9M2w";
  var map = new mapboxgl.Map({
    container: "map",
    style: "mapbox://styles/mapbox/streets-v11",
    center: [lon, lat],
    zoom: 5,
  });

  //adding current location popup
  var popup = new mapboxgl.Popup({ offset: 5 }).setText("Your Location");
  var marker = new mapboxgl.Marker()
    .setLngLat([lon, lat])
    .setPopup(popup)
    .addTo(map);

  //getting bounds
  var bounds = map.getBounds();
  bounds =
    bounds.getNorth() +
    "," +
    bounds.getWest() +
    "," +
    bounds.getSouth() +
    "," +
    bounds.getEast();
  console.log(bounds);

  //calling function to populate markers on tha map from api data
  populateMarkers(bounds);

  function populateMarkers(bounds) {
    //api request
    fetch(
      "https://api.waqi.info/map/bounds/?latlng=" +
        bounds +
        "&token=" +
        "fb5964fcfc03f43640925ebfcee05d3fd81376ff"
    )
      .then((x) => x.json())
      .then((stations) => {
        console.log(stations);

        if (stations.status != "ok") throw stations.reason;
        //looping through each station.
        stations.data.forEach((station) => {
          var coordinates = [station.lon, station.lat];
          var name = station.station["name"];
          var aqi = station["aqi"];
          var info = `Name: ${name} \nAQI: ${aqi}\nCoordinates: ${coordinates}`;
          var popup = new mapboxgl.Popup({ offset: 5 }).setText(info);
          //setting marker color according to aqi value.
          var color;
          var value = parseInt(aqi);
          if (value === NaN) {
            color = "white";
          } else if (value > 0 && value <= 50) {
            color = "green";
          } else if (value >= 51 && value <= 100) {
            color = "yellow";
          } else if (value >= 101 && value <= 150) {
            color = "orange";
          } else if (value >= 151 && value <= 200) {
            color = "red";
          } else if (value >= 201 && value <= 300) {
            color = "purple";
          } else if (value >= 301 && value <= 500) {
            color = "maroon";
          }

          // create DOM element for the marker
          var el = document.createElement("div");
          el.id = "marker";
          el.style.background = color;

          // create the marker
          new mapboxgl.Marker(el)
            .setLngLat(coordinates)
            .setPopup(popup) // sets a popup on this marker
            .addTo(map);


        //when zoom will be changed, it will restart the process.
          map.on('zoomend',function(){
            console.log("Zoom changed!");
              //getting bounds
            var bounds = map.getBounds();
            bounds =
              bounds.getNorth() +
              "," +
              bounds.getWest() +
              "," +
              bounds.getSouth() +
              "," +
              bounds.getEast();
            console.log(bounds);
            populateMarkers(bounds);

          });
        });
      });
  }
}

venereology answered 5 months ago
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