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| var $ = require('jquery');
var FilterForm = require('./filterui');
var QuerybuilderAPI = require('./querybuilderapi');
var L = require('leaflet');
/** AJAX map widget.
* @constructor
* @param {string} mapData - JSON string representing map parameters
* @param {string} mapData.name - widget name used as container ID and
endpoint parameter
* @param {string} mapData.endpoint - URL of the API endpoint
* @param {string} mapData.params - manually defined string that can be passed
to the endpoint
* @param {string} mapData.filter - optional filter ID
*/
var Map = (function() {
'use strict';
var Map = function(mapData) {
mapData = JSON.parse(mapData);
this.arrayMarkers = [];
this.map = null;
this.layerData = null;
this.formID = mapData.filter ? '#' + mapData.filter : null;
this.mapWidgetId = mapData.name;
this.endpoint = mapData.endpoint;
this.params = mapData.params;
var _this = this;
new FilterForm(this.formID);
setUpdateMapEventHandling('#' + _this.mapWidgetId);
_this.init();
function setUpdateMapEventHandling(widgetId) {
$(widgetId).on('update:Map', updateMap);
}
function updateMap(event, filterData) {
removeAllLayers();
addMarkers(filterData);
zoomLeafletViewport();
}
function zoomLeafletViewport() {
if (_this.arrayMarkers.length > 0) {
var group = L.featureGroup(_this.arrayMarkers);
_this.map.fitBounds(group.getBounds());
}
}
function addMarkers(filterData) {
if (filterData) {
$.each(filterData.data, addSingleMarker);
}
}
function addSingleMarker(_, marker) {
_this.addMarker(marker, _this);
}
function removeAllLayers() {
$.each(_this.arrayMarkers, removeLayer);
_this.arrayMarkers = [];
}
function removeLayer(num, layer) {
_this.map.removeLayer(layer);
_this.layerData.removeLayer(layer);
}
};
var MapLinker = function(formID, endpointName, api, params, triggerMap,
mapWidgetId) {
this.endpointName = endpointName;
this.mapWidgetId = mapWidgetId;
this.api = api;
var _this = this;
getData(formID);
function getData(formID) {
if (formID) {
_this.form = $(formID).data('FilterForm');
_this.form.onSubmit(getFilteredData);
} else {
getDefaultData();
}
}
function getDefaultData() {
var queryConfig = {containerID: mapWidgetId};
_this.retrieveData(queryConfig, params, triggerMap);
}
function getFilteredData(event) {
event.preventDefault();
event.stopPropagation();
var queryConfig = _this.form.serialize();
_this.retrieveData(queryConfig, params, triggerMap);
}
};
MapLinker.prototype = {
retrieveData: function(queryConfig, params, callback) {
return this.api.retrieveData(this.mapWidgetId,
queryConfig, params, callback);
}
};
function triggerMapFactory (containerID) {
var container = containerID ? containerID : 'filter';
return function (filteredData) {
$('#' + container).trigger("update:Map", [filteredData]);
};
}
function getLeafletConfig(osm, layerData) {
return {
center: [0.01, 51.405],
zoom: 13,
fullscreenControl: true,
fullscreenOptions: {
position: 'topleft'
},
layers: [osm, layerData]
};
}
function getOsmTileLayer() {
var osmURL = 'http://{s}.tile.osm.org/{z}/{x}/{y}.png';
var osmAttrib = '© <a href="http://osm.org/copyright">OpenStreetMap</a> contributors';
return new L.TileLayer(osmURL, {attribution: osmAttrib});
}
function getLeafletMap(widgetId, layerData) {
var osm = getOsmTileLayer();
var map = L.map(widgetId, getLeafletConfig(osm, layerData));
var baseLayers = { "OpenStreetMap": osm };
var overlays = { "Data Layer": layerData };
L.control.layers(baseLayers, overlays).addTo(map);
return map;
}
Map.prototype = {
init: function() {
this.triggerMap = triggerMapFactory(this.mapWidgetId);
this.map_class = new MapLinker(this.formID, this.endpoint,
new QuerybuilderAPI(this.endpoint),
this.params, this.triggerMap,
this.mapWidgetId);
this.layerData = new L.LayerGroup();
this.arrayMarkers = [];
this.map = getLeafletMap(this.mapWidgetId, this.layerData);
this.map_class.retrieveData({containerID: this.mapWidgetId},
this.params, this.triggerMap);
},
addMarker: function(obj, _this) {
var marker = L.marker({"lat": obj.latitude, "lng": obj.longitude});
var popupText = obj.description;
marker.bindPopup(popupText);
marker.addTo(_this.layerData);
_this.arrayMarkers.push(marker);
}
};
return Map;
})();
module.exports = Map;
|