Old school D3 from simpler times

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andyrutkowski

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two historical maps with transparency slider

Built with blockbuilder.org

<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8' />
    <title>HOLC 1939</title>
    <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
    <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.44.1/mapbox-gl.js'></script>
    <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.44.1/mapbox-gl.css' rel='stylesheet' />
    <style>
        body { margin:0; padding:0; }
        #map { position:absolute; top:0; bottom:0; width:100%; }
    </style>
</head>
<body>

<style>
.map-overlay {
    font:bold 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
    position: absolute;
    width: 25%;
    top: 0;
    left: 0;
    padding: 10px;
}
.map-overlay .map-overlay-inner {
    background-color: #fff;
    box-shadow:0 1px 2px rgba(0, 0, 0, 0.20);
    border-radius: 3px;
    padding: 10px;
    margin-bottom: 10px;
}
.map-overlay label {
    display: block;
    margin: 0 0 10px;
}
.map-overlay input {
    background-color: transparent;
    display: inline-block;
    width: 100%;
    position: relative;
    margin: 0;
    cursor: ew-resize;
}
</style>

<div id='map'></div>

<div class='map-overlay top'>
    <div class='map-overlay-inner'>
        <label>HOLC 1939 <span id='slider-value'>100%</span></label>
        <input id='slider' type='range' min='0' max='100' step='0' value='100' />
      <label>Watts <span id='slider-value1'>100%</span></label>
        <input id='slider1' type='range' min='0' max='100' step='0' value='100' />
    </div>
</div>

<script>
mapboxgl.accessToken = 'pk.eyJ1IjoiYW5keS1ydXRrb3dza2kiLCJhIjoiWDJRMFVUWSJ9.iHl6Cf0M79wmHQlfP6Bk8Q';
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/andy-rutkowski/cjeg8ax4q00pi2rns1v582dy4',
    center: [-118.288096, 33.989976],
    minZoom: 9.5,
    maxZoom: 13,
    zoom: 9.5
});
   map.on('click', function(e) {
  var features = map.queryRenderedFeatures(e.point, {
    layers: ['39GreenBook'] // replace this with the name of the layer
  });
  if (!features.length) {
    return;
  }
  var feature = features[0];
  var popup = new mapboxgl.Popup({ offset: [0, -15] })
    .setLngLat(feature.geometry.coordinates)
    .setHTML('<h3>' + feature.properties.Type + '</h3><p>' + feature.properties.Name + '</p>')
    .setLngLat(feature.geometry.coordinates)
    .addTo(map);
});
     map.on('click', function(e) {
  var features = map.queryRenderedFeatures(e.point, {
    layers: ['47GreenBook'] // replace this with the name of the layer
  });
  if (!features.length) {
    return;
  }
  var feature = features[0];
  var popup = new mapboxgl.Popup({ offset: [0, -15] })
    .setLngLat(feature.geometry.coordinates)
    .setHTML('<h3>' + feature.properties.Type + '</h3><p>' + feature.properties.Name + '</p>')
    .setLngLat(feature.geometry.coordinates)
    .addTo(map);
});
 
  
       var slider = document.getElementById('slider', 'slider1');
var sliderValue = document.getElementById('slider-value', 'slider-value1');
map.on('load', function() {
  
  
  map.addLayer
   ;
     slider.addEventListener('input', function(e) {
        // Adjust the layers opacity. layer here is arbitrary - this could
        // be another layer name found in your style or a custom layer
        // added on the fly using `addSource`.
        map.setPaintProperty('HOLC', 'raster-opacity', parseInt(e.target.value, 10) / 100);
        // Value indicator
        sliderValue.textContent = e.target.value + '%';
    });
 
  ({
    
        "id": "HOLC",
        "source": {
            "type": "raster",
            "url": "mapbox://andy-rutkowski.a0p1p0hr"
        },
        "type": "raster"
    
    })
  
   map.addLayer
   ;
  
slider1.addEventListener('input', function(e) {
        // Adjust the layers opacity. layer here is arbitrary - this could
        // be another layer name found in your style or a custom layer
        // added on the fly using `addSource`.
        map.setPaintProperty('Watts', 'raster-opacity', parseInt(e.target.value, 10) / 100);
        // Value indicator
        sliderValue1.textContent = e.target.value + '%';
    });
 });
  ({
    
    "id":"Watts",
        "source": {
            "type": "raster",
            "url": "mapbox://andy-rutkowski.0tqu2dvy"
        },
        "type": "raster"
     })

</script>

</body>
</html>

https://api.tiles.mapbox.com/mapbox-gl-js/v0.44.1/mapbox-gl.js