Leaflet minimal map - JSFiddle

HTML

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<div id="map"></div>
<input type='button' value='Remove overlays' onclick='helper.RemoveOverlays();' />
<input type='button' value='Add overlays' onclick='AddOverlays();' />
<input type='button' value='Move bottom marker to top' onclick='ChangeZIndex();' />
<input type='button' value='Change z Index (Animated)' onclick='ChangeZIndexAnim();' />
<input type='button' value='Stop animation' onclick='StopAnim();' />

JavaScript

Module

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function LeafletHelper() {
​
    // Create the map
    var map = L.map('map').setView([39.5, -0.5], 4);
​
    // Set up the OSM layer
    var baseLayer = L.tileLayer(
        'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
        maxZoom: 18
    }).addTo(map);
​
    var baseLayers = {
        "OSM tiles": baseLayer
    };
​
    this.map = map;
​
    this.BaseLayers = {
        "OSM tiles": baseLayer
    };
    this.LayersControl = L.control.layers(baseLayers).addTo(map);
​
    this.Overlays = [];
    this.AddOverlay = function (layerOptions, markers) {
        var zIndex = this.Overlays.length;
        var layerGroup = L.layerGroup(markers).addTo(map);
        this.LayersControl.addOverlay(layerGroup, layerOptions.title);
        this.Overlays.push({
            zIndex: zIndex,
            LeafletLayer: layerGroup,
            Options: layerOptions,
            InitialMarkers: markers,
            Title: layerOptions.title
        });
        return layerGroup;
    }
    this.RemoveOverlays = function () {
        for (var i = 0, len = this.Overlays.length; i < len; i++) {
            var layer = this.Overlays[i].LeafletLayer;
            this.map.removeLayer(layer);
            this.LayersControl.removeLayer(layer);
        }
        this.Overlays = [];
    }
    this.SetZIndexByTitle = function (title, zIndex) {
​
        var _this = this;
​
        // remove overlays, order them, and re-add in order
        var overlays = this.Overlays; // save reference
        this.RemoveOverlays();
        this.Overlays = overlays; // restore reference
​
        // filter overlays and set zIndex (may be multiple if dup title)
        overlays.forEach(function (item, idx, arr) {
            if (item.Title === title) {
                item.zIndex = zIndex;
            }
        });
​
        // sort by zIndex ASC
        overlays.sort(function (a, b) {
            return a.zIndex - b.zIndex;
        });
​
        // re-add overlays to map and layers control
        overlays.forEach(function (item, idx, arr) {
            item.LeafletLayer.addTo(_this.map);
            _this.LayersControl.addOverlay(item.LeafletLayer, item.Title);
        });
    }
}
​
window.helper = new LeafletHelper();
​
AddOverlays = function () {
    // does not check for dups.. for simple example purposes only
    helper.AddOverlay({
        title: "Marker A"
    }, [L.marker([36.83711, -2.464459]).bindPopup("Marker A")]);
    helper.AddOverlay({
        title: "Marker B"
    }, [L.marker([36.83711, -3.464459]).bindPopup("Marker B")]);
    helper.AddOverlay({
        title: "Marker C"
    }, [L.marker([36.83711, -4.464459]).bindPopup("Marker c")]);
    helper.AddOverlay({
        title: "Marker D"
    }, [L.marker([36.83711, -5.464459]).bindPopup("Marker D")]);
}
​
AddOverlays();
​
var z = helper.Overlays.length;
​
ChangeZIndex = function () {
    helper.SetZIndexByTitle(helper.Overlays[0].Title, z++);
}
​
ChangeZIndexAnim = function () {
    StopAnim();
    var stuff = ['A', 'B', 'C', 'D'];
    var idx = 0;
    var ms = 200;
    window.tt = setInterval(function () {
        var title = "Marker " + stuff[idx++ % stuff.length];
        helper.SetZIndexByTitle(title, z++);
    }, ms);
}
​
StopAnim = function () {
    if (window.tt) clearInterval(window.tt);
}

CSS

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#map {
    height: 400px;
}

585px

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