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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/>
<title>Lost Rivers of Toronto Map</title>
<!-- Load Leaflet from a https CDN, not http. Look for updates at http://leafletjs.com/download.html -->
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.0.0-rc.2/dist/leaflet.css"/>
<script src="https://unpkg.com/leaflet@1.0.0-rc.2/dist/leaflet.js"></script>
<!-- Proj4Leaflet to support Web Mercator CRS -->
<script src="Proj4Leaflet/lib/proj4-compressed.js"></script>
<script src="Proj4Leaflet/src/proj4leaflet.js"></script>
<!-- jQuery -->
<script src="https://code.jquery.com/jquery-3.2.1.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<link rel="stylesheet" href="https://code.jquery.com/ui/1.10.4/themes/flick/jquery-ui.css">
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<!-- load Font-Awesome used for some page elements like fa-chevron-down (down arrow) -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.6.3/css/font-awesome.min.css">
<!-- Load leaflet.extra-markers from local directory -->
<script src="markers/leaflet.extra-markers.min.js"></script>
<link rel="stylesheet" href="markers/leaflet.extra-markers.min.css">
<style>
body {
padding: 0px;
margin: 0px;
font-family: "Helvetica", sans-serif;
overflow: hidden;
}
#map {
position: absolute;
width: 100%;
height: 100%;
z-index: 1;
}
/* Basemap slider CSS */
#slidercontainer {
position: absolute;
left: 10px;
bottom: 50px;
width: 320px;
z-index: 1000000;
background: #fff;
border-radius: 2px;
padding:20px;
}
#slidercontainer p{
font-weight:bold;
font-size:12px;
margin:2px;
display:inline-block
}
#slider{
height: 6px;
width: 100%;
}
/* Customize jQuery Slider UI - Handle color and shape*/
.ui-slider .ui-slider-handle {
width: 20px;
height: 20px;
border-radius: 50%;
border: none;
cursor: pointer;
}
/* Handle color for river layer filter */
#slider > span {
background: #00C5CD;
}
/* Handle color for tile overlay */
#basemapslider > span {
background: #808080;
}
/* Customizing Slider UI - Handle placement along slider to line up*/
.ui-slider-horizontal .ui-slider-handle {
top: 50%;
margin-top: -10px;
}
/* Style the counter*/
#yearCount{
border:0;
color:#00C5CD;
font-weight:bold;
font-size:14px;
width:50px
}
#console > label {
font-weight:bold;
font-size:14px;
}
#sliderLegend {
width:100%;
}
/* Style the legend inside the sliderLegend div */
label_scale{
display: inline-block;
text-align:center;
font-size:10px;
}
/* Style the legend inside the sliderLegend div - ensures the first label appears over the slider start */
label_scale:first-child{
text-align:left;
margin-left:-10px;
margin-right:10px;
}
/* Style the legend inside the sliderLegend div - ensures the last label appears over the slider end */
label_scale:last-child{
text-align:right;
margin-right:-10px;
padding-left:10px;
}
</style>
</head>
<body>
<!-- Map container -->
<div id="map"></div>
<!-- Filter slider container -->
<div id="slidercontainer">
<!-- Counter that updates as slider is changed to declare selected value -->
<label class="control-label">Disappearing Rivers Slider: <br>Year River was last seen on a Map:</label>
<input type="text" id="yearCount" readonly>
<!-- Spacing -->
<br>
<br>
<!-- jQuery Slider -->
<div id="slider" class="ui-slider ui-slider-horizontal ui-widget ui-widget-content ui-corner-all"></div>
<!-- Legend that appears below the slider -->
<div id="sliderLegend"></div>
</div>
<script>
function initMap() {
// This creates the Leaflet map with a generic start point, because code at bottom automatically fits bounds to the rivers layer
var map = L.map('map', {
center: [0, 0],
maxZoom: 17,
minZoom: 12,
});
// This displays a base layer map (other options available)
// Using Carto Positron basemap
// https://leaflet-extras.github.io/leaflet-providers/preview/
//var lightAll = new L.tileLayer('http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png', {
//attribution: '&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a> //contributors, &copy; <a href="http://cartodb.com/attributions">CartoDB</a>'
//}).addTo(map);
// using Esri World Topo Map to provide useful topographic reference for drainage pattern
var Esri_WorldTopoMap = L.tileLayer('http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer/tile/{z}/{y}/{x}', {
attribution: 'Tiles &copy; Esri &mdash; Esri, DeLorme, NAVTEQ, TomTom, Intermap, iPC, USGS, FAO, NPS, NRCAN, GeoBase, Kadaster NL, Ordnance Survey, Esri Japan, METI, Esri China (Hong Kong), and the GIS User Community'
}).addTo(map);
//jQuery Slider Widget http://api.jqueryui.com/slider/
//Overlay layer and slider controls
$("#basemapslider").slider({
animate: true,
value: 0.5,
min: 0,
max: 1,
step: 0.1,
slide: function (event, ui) {
// adjusting opactity on the mytile layer
mytile.setOpacity(ui.value);
}
});
// linking to the tiles created with QTiles in QGIS
// the custom tiles are saved in a folder called "tiles"
// var mytile =L.tileLayer('tiles/{z}/{x}/{y}.png', {
// tms: false,
// opacity: 0.5,
// errorTileUrl: 'tiles/missing.png',
// }).addTo(map);
// declaring color breaks
// using methodology provided in the leaflet example: http://leafletjs.com/examples/choropleth/
function getColor(d) {
return d >= 2017 ? '#005CE6' :
d >= 1949 ? '#FF0000' :
d >= 1937 ? '#FF7F7F' :
d >= 1931 ? '#FF9600' :
d >= 1927 ? '#FFD900' :
d >= 1921 ? '#FFFF00' :
d >= 1913 ? '#98E600' :
d >= 1901 ? '#70A800' :
d >= 1890 ? '#A8A800' :
d >= 1872 ? '#A87000' :
d >= 1851 ? '#A80000' :
d >= 1827 ? '#730000' :
d >= 1802 ? '#000000' :
'#000000';
}
// define a styling function for our GeoJSON layer so that its line color depends on feature.properties.lsatNTS
// breaks are created based on what are declared in the getcolor function above
function style(feature) {
return {
"color": getColor(feature.properties.lastNTS),
"weight": 3,
};
}
// loading the rivers geojson layer
var rivers;
// This loads the path GeoJSON map data file from a local folder
// jQuery getJSON() method - http://api.jquery.com/jquery.getjson/
$.getJSON('data/BI_Lost_Rivers_20170705_WAMS_qgis.geojson', function(json) {
// Declaring using the Proj4Leaflet geojson call so that can import geojson file using web mercator crs
rivers = L.Proj.geoJson(json, {
// style path
// http://leafletjs.com/examples/geojson/
style: style,
// filtering layer using the lastNTS attribute
// Equal to or greater than the value
filter: function (feature, layer) {
return feature.properties.lastNTS >= "1802";
}
// add path layer to the map
});
// fits the map view to fit the bounds of the river layer when the map loads
map.fitBounds(rivers.getBounds());
rivers.addTo(map);
});
// jQuery Slider Widget http://api.jqueryui.com/slider/
// Value is the default location of handle on slider
// Using range option to go from one handle to the slider max
// https://api.jqueryui.com/slider/#option-range
// valMap array contains the custom intervals that will be used to query the layer
var valMap = ["1802", "1827", "1830", "1834", "1842", "1848", "1851", "1852", "1853", "1857", "1858", "1862", "1863", "1868", "1872", "1875", "1876", "1882", "1884", "1885", "1888", "1889", "1890", "1892", "1893", "1894", "1901", "1902", "1903", "1909", "1910", "1913", "1915", "1918", "1921", "1927", "1931", "1932", "1937", "1942", "1949", "1950"];
$( "#slider" ).slider({
range: "max",
// Using the first value in the valMap array
min: 0,
// Using the last vale in the valMap array
max: valMap.length - 1,
// Change event captures when the the slider handle HAS MOVED location. Change event only updates/captured after the slider handle is moved.
change: function( event, ui ) {
// update the year counter based on the location/value of the handle on the slider
$( "#yearCount" ).val( valMap[ui.value] );
// leaflet geojson filter does not allow you to apply the filter dynamically after the layer has been imported to the map
// must remove then readd the layer again with a new filter
// first clears the layer from the map
rivers.clearLayers();
// next readd the layer with the filter set using the valMap[ui.value]
$.getJSON('data/BI_Lost_Rivers_20170705_WAMS_qgis.geojson', function(json) {
// Declaring using the Proj4Leaflet geojson call so that can import geojson file using web mercator crs
rivers = L.Proj.geoJson(json, {
// style path
// http://leafletjs.com/examples/geojson/
style: style,
// filtering layer using the lastNTS attribute
filter: function (feature, layer) {
return feature.properties.lastNTS >= valMap[ui.value];
}
// add path layer to the map
}).addTo(map);
});
},
// Slide event captures when the the slider handle IS BEING MOVED location. Slide event updates/captured while the slider handle is being moved.
// Data is too complex for this example to use slide events
});
// yearCount value, required to displace default value when the page loads
// Uses the first value from the array, in this case 1802
$( "#yearCount" ).val( valMap[0]);
// Legend to place labels below slider
// Items are the labels that will appear
// To update the legend only items variable needs to be updated
// Number of items must mach number of intervals, this example there are 12
// Start and end items must match the min and max declared for the slider
var items = ["1802", "1950"];
// Calculate the legth of the legend based on number of items declared to identify spacing required
// Do not change when updating the items variable
var length = 100 / (items.length - 1);
$.each(items, function(key,value){
var spacing = length;
if(key === 0 || key === items.length-1)
spacing = length/2;
// Updates sliderLegend div below the slider using spacing variable to set calculated label spacing width and include label value for the label
// Do not change when updating the items variable
$("#sliderLegend").append("<label_scale style='width: "+spacing+"%'>"+value+"</label_scale>");
});
}
initMap();
</script>
</body>
</html>