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Resizable Split Map Panes

Comparing layers

This example allows comparison of two layers with resizable map panes using the Split.js library.

JavaScript

function initMap() {
  const mapOptions = {
    center: { lat: 44.5250489, lng: -110.83819 },
    zoom: 18,
    scaleControl: false,
    streetViewControl: false
  };

  // instantiate the map on the left with control positioning
  mapLeft = new google.maps.Map(document.getElementById("map-left"), {
    ...mapOptions,
    mapTypeId: "satellite",
    tilt: 0, // at high zoom levels we need to maintain the same projection
    fullscreenControlOptions: {
      position: google.maps.ControlPosition.LEFT_BOTTOM
    },
    mapTypeControlOptions: {
      position: google.maps.ControlPosition.LEFT_TOP
    },
    zoomControlOptions: {
      position: google.maps.ControlPosition.LEFT_BOTTOM
    }
  });

  // instantiate the map on the right with control positioning
  mapRight = new google.maps.Map(document.getElementById("map-right"), {
    ...mapOptions,
    fullscreenControlOptions: {
      position: google.maps.ControlPosition.RIGHT_BOTTOM
    },
    mapTypeControlOptions: {
      position: google.maps.ControlPosition.RIGHT_TOP
    },
    zoomControlOptions: {
      position: google.maps.ControlPosition.RIGHT_BOTTOM
    }
  });

  // helper function to keep maps in sync
  function sync(...maps) {
    let center, zoom;

    function update(changedMap) {
      maps.forEach(m => {
        if (m === changedMap) {
          return;
        }
        m.setCenter(center);
        m.setZoom(zoom);
      });
    }

    maps.forEach(m => {
      m.addListener("bounds_changed", () => {
        const changedCenter = m.getCenter();
        const changedZoom = m.getZoom();

        if (changedCenter !== center || changedZoom !== zoom) {
          center = changedCenter;
          zoom = changedZoom;
          update(m);
        }
      });
    });
  }

  sync(mapLeft, mapRight);

  function handleContainerResize() {
    const width = document.getElementById("container").offsetWidth;
    document.getElementById("map-left").style.width = `${width}px`;
    document.getElementById("map-right").style.width = `${width}px`;
  }

  // trigger to set map container size since using absolute
  handleContainerResize();
  // add event listener
  window.addEventListener("resize", handleContainerResize);

  Split(["#left", "#right"], {
    sizes: [50, 50]
  });
}

CSS

/* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
#map {
  height: 100%;
}

/* Optional: Makes the sample page fill the window. */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

#container,
#left,
#right,
.map,
.gutter {
  height: 100%;
}

#left,
#right,
.gutter {
  float: left;
  position: relative;
  overflow: hidden;
}

#map-left {
  position: absolute;
  left: 0;
  top: 0;
}

#map-right {
  position: absolute;
  right: 0;
  top: 0;
}

.gutter {
  background-color: #eee;
  background-repeat: no-repeat;
  background-position: 50%;
}

.gutter.gutter-horizontal {
  cursor: col-resize;
  background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAeCAYAAADkftS9AAAAIklEQVQoU2M4c+bMfxAGAgYYmwGrIIiDjrELjpo5aiZeMwF+yNnOs5KSvgAAAABJRU5ErkJggg==");
}

HTML

<!DOCTYPE html>
<html>
  <head>
    <title>Split Map Panes</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/split.js/1.5.11/split.min.js"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      defer
    ></script>
    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./app.js"></script>
  </head>
  <body>
    <div id="container">
      <div id="left">
        <div id="map-left" class="map"></div>
      </div>
      <div id="right">
        <div id="map-right" class="map"></div>
      </div>
    </div>
  </body>
</html>

All

<!DOCTYPE html>
<html>
  <head>
    <title>Split Map Panes</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/split.js/1.5.11/split.min.js"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      defer
    ></script>
    <style type="text/css">
      /* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
      #map {
        height: 100%;
      }

      /* Optional: Makes the sample page fill the window. */
      html,
      body {
        height: 100%;
        margin: 0;
        padding: 0;
      }

      #container,
      #left,
      #right,
      .map,
      .gutter {
        height: 100%;
      }

      #left,
      #right,
      .gutter {
        float: left;
        position: relative;
        overflow: hidden;
      }

      #map-left {
        position: absolute;
        left: 0;
        top: 0;
      }

      #map-right {
        position: absolute;
        right: 0;
        top: 0;
      }

      .gutter {
        background-color: #eee;
        background-repeat: no-repeat;
        background-position: 50%;
      }

      .gutter.gutter-horizontal {
        cursor: col-resize;
        background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAeCAYAAADkftS9AAAAIklEQVQoU2M4c+bMfxAGAgYYmwGrIIiDjrELjpo5aiZeMwF+yNnOs5KSvgAAAABJRU5ErkJggg==");
      }
    </style>
    <script>
      (function(exports) {
        "use strict";

        let mapLeft, mapRight;

        function initMap() {
          const mapOptions = {
            center: {
              lat: 44.5250489,
              lng: -110.83819
            },
            zoom: 18,
            scaleControl: false,
            streetViewControl: false
          }; // instantiate the map on the left with control positioning

          mapLeft = new google.maps.Map(document.getElementById("map-left"), {
            ...mapOptions,
            mapTypeId: "satellite",
            tilt: 0,
            // at high zoom levels we need to maintain the same projection
            fullscreenControlOptions: {
              position: google.maps.ControlPosition.LEFT_BOTTOM
            },
            mapTypeControlOptions: {
              position: google.maps.ControlPosition.LEFT_TOP
            },
            zoomControlOptions: {
              position: google.maps.ControlPosition.LEFT_BOTTOM
            }
          }); // instantiate the map on the right with control positioning

          mapRight = new google.maps.Map(document.getElementById("map-right"), {
            ...mapOptions,
            fullscreenControlOptions: {
              position: google.maps.ControlPosition.RIGHT_BOTTOM
            },
            mapTypeControlOptions: {
              position: google.maps.ControlPosition.RIGHT_TOP
            },
            zoomControlOptions: {
              position: google.maps.ControlPosition.RIGHT_BOTTOM
            }
          }); // helper function to keep maps in sync

          function sync(...maps) {
            let center, zoom;

            function update(changedMap) {
              maps.forEach(m => {
                if (m === changedMap) {
                  return;
                }

                m.setCenter(center);
                m.setZoom(zoom);
              });
            }

            maps.forEach(m => {
              m.addListener("bounds_changed", () => {
                const changedCenter = m.getCenter();
                const changedZoom = m.getZoom();

                if (changedCenter !== center || changedZoom !== zoom) {
                  center = changedCenter;
                  zoom = changedZoom;
                  update(m);
                }
              });
            });
          }

          sync(mapLeft, mapRight);

          function handleContainerResize() {
            const width = document.getElementById("container").offsetWidth;
            document.getElementById("map-left").style.width = `${width}px`;
            document.getElementById("map-right").style.width = `${width}px`;
          } // trigger to set map container size since using absolute

          handleContainerResize(); // add event listener

          window.addEventListener("resize", handleContainerResize);
          Split(["#left", "#right"], {
            sizes: [50, 50]
          });
        }

        exports.initMap = initMap;
      })((this.window = this.window || {}));
    </script>
  </head>
  <body>
    <div id="container">
      <div id="left">
        <div id="map-left" class="map"></div>
      </div>
      <div id="right">
        <div id="map-right" class="map"></div>
      </div>
    </div>
  </body>
</html>
(function(exports) { "use strict"; let mapLeft, mapRight; function initMap() { const mapOptions = { center: { lat: 44.5250489, lng: -110.83819 }, zoom: 18, scaleControl: false, streetViewControl: false }; // instantiate the map on the left with control positioning mapLeft = new google.maps.Map(document.getElementById("map-left"), { ...mapOptions, mapTypeId: "satellite", tilt: 0, // at high zoom levels we need to maintain the same projection fullscreenControlOptions: { position: google.maps.ControlPosition.LEFT_BOTTOM }, mapTypeControlOptions: { position: google.maps.ControlPosition.LEFT_TOP }, zoomControlOptions: { position: google.maps.ControlPosition.LEFT_BOTTOM } }); // instantiate the map on the right with control positioning mapRight = new google.maps.Map(document.getElementById("map-right"), { ...mapOptions, fullscreenControlOptions: { position: google.maps.ControlPosition.RIGHT_BOTTOM }, mapTypeControlOptions: { position: google.maps.ControlPosition.RIGHT_TOP }, zoomControlOptions: { position: google.maps.ControlPosition.RIGHT_BOTTOM } }); // helper function to keep maps in sync function sync(...maps) { let center, zoom; function update(changedMap) { maps.forEach(m => { if (m === changedMap) { return; } m.setCenter(center); m.setZoom(zoom); }); } maps.forEach(m => { m.addListener("bounds_changed", () => { const changedCenter = m.getCenter(); const changedZoom = m.getZoom(); if (changedCenter !== center || changedZoom !== zoom) { center = changedCenter; zoom = changedZoom; update(m); } }); }); } sync(mapLeft, mapRight); function handleContainerResize() { const width = document.getElementById("container").offsetWidth; document.getElementById("map-left").style.width = `${width}px`; document.getElementById("map-right").style.width = `${width}px`; } // trigger to set map container size since using absolute handleContainerResize(); // add event listener window.addEventListener("resize", handleContainerResize); Split(["#left", "#right"], { sizes: [50, 50] }); } exports.initMap = initMap; })((this.window = this.window || {}));
/* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; } #container, #left, #right, .map, .gutter { height: 100%; } #left, #right, .gutter { float: left; position: relative; overflow: hidden; } #map-left { position: absolute; left: 0; top: 0; } #map-right { position: absolute; right: 0; top: 0; } .gutter { background-color: #eee; background-repeat: no-repeat; background-position: 50%; } .gutter.gutter-horizontal { cursor: col-resize; background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAeCAYAAADkftS9AAAAIklEQVQoU2M4c+bMfxAGAgYYmwGrIIiDjrELjpo5aiZeMwF+yNnOs5KSvgAAAABJRU5ErkJggg=="); }
<!DOCTYPE html> <html> <head> <title>Split Map Panes</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/split.js/1.5.11/split.min.js"></script> <script src="https://maps.googleapis.com/maps/api/js?key=&callback=initMap&libraries=&v=weekly" defer ></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="container"> <div id="left"> <div id="map-left" class="map"></div> </div> <div id="right"> <div id="map-right" class="map"></div> </div> </div> </body> </html>