leafletLegendHelpers.js

angular.module("ui-leaflet").factory('leafletLegendHelpers', function ($http, $q, $log, leafletHelpers) {
	var requestQueue = {},
		isDefined = leafletHelpers.isDefined;

	var _execNext = function(mapId) {
		var queue = requestQueue[mapId];
		var task = queue[0];
		$http(task.c).then(function(data) {
			queue.shift();
			task.d.resolve(data);
			if (queue.length > 0) {
				_execNext(mapId);
			}
		}, function(err) {
			queue.shift();
			task.d.reject(err);
			if (queue.length > 0) {
				_execNext(mapId);
			}
		});
	};

	var _updateLegend = function(div, legendData, type, url) {
		div.innerHTML = '';
		if(legendData.error) {
			div.innerHTML += '<div class="info-title alert alert-danger">' + legendData.error.message + '</div>';
		} else {
			if (type === 'arcgis') {
				for (var i = 0; i < legendData.layers.length; i++) {
					var layer = legendData.layers[i];
					div.innerHTML += '<div class="info-title" data-layerid="' + layer.layerId + '">' + layer.layerName + '</div>';
					for(var j = 0; j < layer.legend.length; j++) {
						var leg = layer.legend[j];
						div.innerHTML +=
							'<div class="inline" data-layerid="' + layer.layerId + '"><img src="data:' + leg.contentType + ';base64,' + leg.imageData + '" /></div>' +
							'<div class="info-label" data-layerid="' + layer.layerId + '">' + leg.label + '</div>';
					}
				}
			}
			else if (type === 'image') {
				div.innerHTML = '<img src="' + url + '"/>';
			}
		}
	};

	var _getOnAddLegend = function(legendData, legendClass, type, url) {
		return function(/*map*/) {
			var div = L.DomUtil.create('div', legendClass);

			if (!L.Browser.touch) {
				L.DomEvent.disableClickPropagation(div);
				L.DomEvent.on(div, 'mousewheel', L.DomEvent.stopPropagation);
			} else {
				L.DomEvent.on(div, 'click', L.DomEvent.stopPropagation);
			}
			_updateLegend(div, legendData, type, url);
			return div;
		};
	};

	var _getOnAddArrayLegend = function(legend, legendClass) {
		return function(/*map*/) {
			var div = L.DomUtil.create('div', legendClass);
            for (var i = 0; i < legend.colors.length; i++) {
                div.innerHTML +=
                    '<div class="outline"><i style="background:' + legend.colors[i] + '"></i></div>' +
                    '<div class="info-label">' + legend.labels[i] + '</div>';
            }
            if (!L.Browser.touch) {
				L.DomEvent.disableClickPropagation(div);
				L.DomEvent.on(div, 'mousewheel', L.DomEvent.stopPropagation);
			} else {
				L.DomEvent.on(div, 'click', L.DomEvent.stopPropagation);
			}
            return div;
		};
	};

	return {
		getOnAddLegend: _getOnAddLegend,
		getOnAddArrayLegend: _getOnAddArrayLegend,
		updateLegend: _updateLegend,
		addLegendURL: function(mapId, config) {
			var d = $q.defer();
			if(!isDefined(requestQueue[mapId])) {
				requestQueue[mapId] = [];
			}
			requestQueue[mapId].push({c:config,d:d});
			if (requestQueue[mapId].length === 1) {
				_execNext(mapId);
			}
			return d.promise;
		}
	};
});