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script.js
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script.js
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$(document).ready(function() {
const layers = [
{name: 'pre1900', path: 'geojson/pre1900.geojson', layer: null},
{name: '1900s', path: 'geojson/1900s.geojson', layer: null},
{name: '1910s', path: 'geojson/1910s.geojson', layer: null},
{name: '1920s', path: 'geojson/1920s.geojson', layer: null},
{name: '1930s', path: 'geojson/1930s.geojson', layer: null},
{name: '1940s', path: 'geojson/1940s.geojson', layer: null},
{name: '1950s', path: 'geojson/1950s.geojson', layer: null},
{name: '1960s', path: 'geojson/1960s.geojson', layer: null},
{name: '1970s', path: 'geojson/1970s.geojson', layer: null},
{name: '1980s', path: 'geojson/1980s.geojson', layer: null},
{name: '1990s', path: 'geojson/1990s.geojson', layer: null},
{name: '2000s', path: 'geojson/2000s.geojson', layer: null},
{name: '2010s', path: 'geojson/2010s.geojson', layer: null},
];
// From layers, calculate how many tabs
const tabs = layers.length;
// For each layer defined above, generate a tab and load the geojson
for (var i = 0; i < tabs; i++) {
// Create a tab and append above the map
$('.tabBar').append('<div num="' + i + '" class="tabItem">' + layers[i].name + '</div>');
// Read the geojson file and generate a Leaflet layer
(function(i) {
$.getJSON(layers[i].path, function(data) {
layers[i].layer = L.geoJson(data, {
style: stylePast,
onEachFeature: function(feature, layer) {
// Add a popup with address and year built
layer.bindPopup(feature.properties.siteaddres +
'<br>Built in ' + feature.properties.yearbuilt)
}
})
// As soon as the first tab is loaded, activate it
if (i === 0) { $('.tabItem[num="0"]').click() }
})
})(i)
}
// Edit the center point and zoom level
var map = L.map('map', {
center: [41.76206, -72.74203],
zoom: 13,
scrollWheelZoom: false,
keyboard: false,
});
// Edit links to your GitHub repo and data source credit
map.attributionControl
.setPrefix('View <a href="https://github.com/ontheline/otl-year-built" target="_blank">data and code on GitHub</a>, created with <a href="http://leafletjs.com" title="A JS library for interactive maps">Leaflet</a>');
// Basemap CartoDB layer with labels
L.tileLayer('https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}{r}.png', {
attribution: '© <a href="http://www.openstreetmap.org/copyright"> \
OpenStreetMap</a> contributors, © \
<a href="http://cartodb.com/attributions">CartoDB</a>'
}).addTo(map);
// Add West Hartford town boundary
$.getJSON("geojson/westhartford.geojson", function (data) {
L.geoJson(data, {
interactive: false,
style: function (feature) {
return {
'color': 'black',
'weight': 0.5,
'fillOpacity': 0,
}
}
}).addTo(map);
});
// Add scale to the bottom-right
L.control.scale().addTo(map);
// Define styles for past and present decades
const stylePast = {
fillColor: '#222',
weight: 0,
opacity: 0.8,
color: '#222',
fillOpacity: 0.8
}
const stylePresent = {
fillColor: 'blue',
weight: 0,
opacity: 0.8,
color: 'blue',
fillOpacity: 0.8
}
// Given a tab number `num`, show all geojsons for and before the tab,
// and hide all after that tab
const setChoropleth = function(num) {
for (var i = 0; i < tabs; i++) {
var l = layers[i].layer;
if (l) {
if (i < num && !map.hasLayer(l)) {
map.addLayer(l);
}
else if (i === num && !map.hasLayer(l)) {
map.addLayer(l);
}
else if ((i > num) && map.hasLayer(l)) {
map.removeLayer(l);
}
l.setStyle( i === num ? stylePresent : stylePast )
}
}
}
// When a new tab is selected, this removes/adds the GeoJSON data layers
$(".tabItem").click(function() {
// Paint active tab in red
$(".tabItem").removeClass("selected");
$(this).addClass("selected");
setChoropleth( parseInt($(this).attr('num')) );
// Manually trigger "moveend" so that hash updates, without really moving
map.setZoom(map.getZoom());
});
// This watches for arrow keys to advance the tabs
$("body").keydown(function(e) {
var selectedTab = parseInt($(".selected").attr('num'));
var nextTab;
// previous tab with left arrow
if (e.keyCode == 37) {
nextTab = (selectedTab == 0) ? tabs-1 : selectedTab - 1;
}
// next tab with right arrow
else if (e.keyCode == 39) {
nextTab = (selectedTab == tabs-1) ? 0 : selectedTab + 1;
}
$('.tabItem[num="' + nextTab + '"').click();
});
// add custom legend https://www.figma.com/file/7JitgyYxiT3xR3fyoZttKb/otl-zoning-graphics
var legend = L.control({position: 'bottomright'});
legend.onAdd = function(map) {
var div = L.DomUtil.create('div', 'legend');
div.innerHTML += '<img src="./otl-year-built-legend.png" alt="Year Built Legend" width="200">';
return div;
};
legend.addTo(map);
});