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ConditionALs, Map Layers, and Visual Design

Today we will focus on styling our map through the use of Leaflet Feature groups, which means more JavaScript!

Feature groups are like containers that you can use to group your map content. For this lab we will be creating two layers for our survey question of "Is your English your first language?"

One group will be for yes and another group for no.

Goals

  • Use conditional statements to add content into Leaflet FeatureGroups
  • Use Leaflet’s circleMarkers to visualize points
  • Change the basemap for our maps

Start by creating a week7 folder in your lab assignments repo.

Get ahead start

If you finished lab 6, you can also copy the contents of your week_6 folder and skip the following setup section.

Starting template code for lab #7

index.html
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<!DOCTYPE html>
<html>
    <head>
        <title>Lab 6</title>
        <!-- hint: remember to change your page title! -->
        <meta charset="utf-8" />
        <link rel="shortcut icon" href="#">
        <link rel="stylesheet" href="styles/style.css">

        <!-- Leaflet's css-->
        <link rel="stylesheet" href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css" />

        <!-- Leaflet's JavaScript-->
        <script src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"></script>
        <script src="js/papaparse.min.js"></script>
    </head>

    <body>
        <header>
            Covid Vaccination Stories
        </header>

        <div class="main">
            <div id="contents">
                <div id="placeForButtons"></div>
                <!-- Be sure to use your own survey here!!!!!!! -->
                <div id="theSurvey">
                    <!-- moved the survey out of its iframe and into a button -->
                    <div id="surveyButton">
                        <a href="https://docs.google.com/forms/d/e/1FAIpQLScD0IOr_U4r0q4HlBkZ7olkA5OJpgInePF8DQbIrIWDeTm1jw/viewform">📝Take the survey</a>
                    </div>
                </div>
            </div>
            <div id="the_map"></div>
        </div>
        <div id="footer">
            Copyright(2022)
        </div>
        <script src="js/init.js"></script>
    </body>
</html>
js/init.js
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// declare variables
let mapOptions = {'center': [34.0709,-118.444],'zoom':5}

// declare the map
const map = L.map('the_map').setView(mapOptions.center, mapOptions.zoom);

L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
    attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);

function addMarker(data){
    // console.log(data)
    // these are the names of our lat/long fields in the google sheets:
    L.marker([data.lat,data.lng]).addTo(map).bindPopup(`<h2>${data['Location']}</h2> <h3>${data['OpenEnded']}</h3>`)
    createButtons(data.lat,data.lng,data['Location'])
    return
}

function createButtons(lat,lng,title){
    const newButton = document.createElement("button"); // adds a new button
    newButton.id = "button"+title; // gives the button a unique id
    newButton.innerHTML = title; // gives the button a title
    newButton.setAttribute("lat",lat); // sets the latitude 
    newButton.setAttribute("lng",lng); // sets the longitude 
    newButton.addEventListener('click', function(){
        map.flyTo([lat,lng]); //this is the flyTo from Leaflet
    })
    const spaceForButtons = document.getElementById('placeForButtons')
    spaceForButtons.appendChild(newButton);//this adds the button to our page.
}

const dataUrl = "https://docs.google.com/spreadsheets/d/e/2PACX-1vS2WyfKTyZJ-_ja3GGrxoAXwranavyDGXYsxeFUO4nvHpCJrkKhChymXQqUEyhdGLnz9VN6BJv5tOjp/pub?gid=1560504149&single=true&output=csv"

function loadData(url){
    Papa.parse(url, {
        header: true,
        download: true,
        complete: results => processData(results)
    })
}

function processData(results){
    console.log(results)
    results.data.forEach(data => {
        console.log(data)
        addMarker(data)
    })
}

loadData(dataUrl)
styles/style.css
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body{
    display: grid;
    grid-template-rows: 50px auto auto;
    grid-template-areas: "header" "main_content" "footer";
    background-color: aqua;
    gap: 10px;
}

header{
    grid-area: header;
    justify-self: center;
    align-self: center;
}

#footer{
    grid-area: footer;
}

.main{
    grid-area: main_content;
    grid-template-columns: 1fr 1fr;
    grid-template-areas: "main_map content";
    display: grid;
}

#contents{
    grid-area: content;
    display: grid;
    grid-template-rows: 3fr 1fr; 
    grid-template-areas: "buttonHome" "survey"
}

#the_map{
    height:80vh;
    grid-area: main_map;
}

#theSurvey{
    grid-area: survey;
    justify-self: center; /* added this to center the button in the div */
}

/* css for the button */
#surveyButton{
    padding: 15px 32px;
    margin: 10px;
    background-color: #4CAF50;
    cursor: pointer;
}

/* css for button to get rid of the underline */
#surveyButton a{
    text-decoration: none; 
}

#placeForButtons{
    grid-area: buttonHome;
    display:grid;
    grid-template-columns: repeat(2, 1fr);
}
js/papaparse.min.js
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Papa Parse
v5.3.2
https://github.com/mholt/PapaParse
License: MIT
*/
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