Created
April 19, 2012 21:08
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Demo of Backbone.js using ESRI REST in Leaflet
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| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> | |
| <html> | |
| <head> | |
| <meta content='text/html, charset=UTF-8' http-equiv='Content-Type' /> | |
| <meta content='IE=7,IE=8,IE=9' http-equiv='X-UA-Compatible' /> | |
| <meta content='initial-scale=1, maximum-scale=1, user-scalable=no' name='viewport' /> | |
| <style type="text/css"> | |
| @import url("http://code.leafletjs.com/leaflet-0.3.1/leaflet.css"); | |
| html, body, div, span, applet, object, iframe, | |
| h1, h2, h3, h4, h5, h6, p, blockquote, pre, | |
| a, abbr, acronym, address, big, cite, code, | |
| del, dfn, em, img, ins, kbd, q, s, samp, | |
| small, strike, strong, sub, sup, tt, var, | |
| b, u, i, center, | |
| dl, dt, dd, ol, ul, li, | |
| fieldset, form, label, legend, | |
| table, caption, tbody, tfoot, thead, tr, th, td, | |
| article, aside, canvas, details, embed, | |
| figure, figcaption, footer, header, hgroup, | |
| menu, nav, output, ruby, section, summary, | |
| time, mark, audio, video { | |
| margin: 0; | |
| padding: 0; | |
| border: 0; | |
| font-size: 100%; | |
| font: inherit; | |
| vertical-align: baseline; | |
| } | |
| body { | |
| line-height: 1; | |
| } | |
| #map { | |
| position: absolute; | |
| top: 0; | |
| bottom: 0; | |
| left: 0; | |
| right: 0; | |
| } | |
| </style> | |
| <title>Backbone/ESRI/Leaflet EarthQuake Demo</title> | |
| <body> | |
| <div id='map'></div> | |
| <div id='footer'></div> | |
| </body> | |
| <script type='text/javascript' src='http://cdnjs.cloudflare.com/ajax/libs/jquery/1.7.2/jquery.min.js'></script> | |
| <script type='text/javascript' src='http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.3.3/underscore-min.js'></script> | |
| <script type='text/javascript' src='http://cdnjs.cloudflare.com/ajax/libs/backbone.js/0.9.2/backbone-min.js'></script> | |
| <script type='text/javascript' src='http://code.leafletjs.com/leaflet-0.3.1/leaflet.js'></script> | |
| <script type='text/javascript'> | |
| (function(){ | |
| // ESRI to GEO Converstion | |
| // project can be found here | |
| // https://github.com/odoe/esritogeo | |
| var GeoUtil = function() {}; | |
| GeoUtil.prototype.stripJSON = function(str) { | |
| return str.replace(/\\n/g, "\\n").replace(/\\t/g, "\\t"); | |
| }; | |
| GeoUtil.prototype.jsonToObject = function(strIn) { | |
| try { | |
| return JSON.parse(this.stripJSON(strIn)); | |
| } catch (err) { | |
| console.log(err); | |
| return null; | |
| } | |
| }; | |
| GeoUtil.prototype.parseGeometryType = function(type) { | |
| switch (type) { | |
| case 'esriGeometryPoint': | |
| return 'Point'; | |
| case 'esriGeometryMultiPoint': | |
| return 'MultiPoint'; | |
| case 'esriGeometryPolyline': | |
| return 'LineString'; | |
| case 'esriGeometryPolygon': | |
| return 'Polygon'; | |
| default: | |
| return 'unknown'; | |
| } | |
| }; | |
| GeoUtil.prototype.featureToGeo = function(feature, type) { | |
| var feature_res, geometry; | |
| geometry = { | |
| type: type, | |
| coordinates: (function() { | |
| switch (type) { | |
| case 'Polygon': | |
| return feature.geometry.rings; | |
| case 'LineString': | |
| return feature.geometry.paths; | |
| case 'Point': | |
| return [feature.geometry.x, feature.geometry.y]; | |
| default: | |
| return []; | |
| } | |
| })() | |
| }; | |
| return feature_res = { | |
| type: "Feature", | |
| geometry: geometry, | |
| properties: feature.attributes | |
| }; | |
| }; | |
| GeoUtil.prototype.convertEsriToGeo = function(input, callback) { | |
| var errors, feature, features, json, result, type, _i, _len, _ref; | |
| result = null; | |
| errors = null; | |
| if (typeof input === "string") { | |
| json = this.jsonToObject(input); | |
| } else { | |
| json = input; | |
| } | |
| if (json !== null) { | |
| type = this.parseGeometryType(json.geometryType); | |
| features = []; | |
| _ref = json.features; | |
| for (_i = 0, _len = _ref.length; _i < _len; _i++) { | |
| feature = _ref[_i]; | |
| features.push(this.featureToGeo(feature, type)); | |
| } | |
| result = { | |
| type: 'FeatureCollection', | |
| features: features | |
| }; | |
| } else { | |
| errors = 'Error: JSON cannot be parsed'; | |
| } | |
| return callback(errors, result); | |
| }; | |
| // END ESRI to GEO conversion tool | |
| var EQModel = Backbone.Model.extend({ | |
| url: function() { | |
| return 'http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Earthquakes/Since_1970/MapServer/0/query'; | |
| } | |
| }); | |
| var map = new L.Map('map'); | |
| var mapquestUrl = 'http://otile1.mqcdn.com/tiles/1.0.0/osm/{z}/{x}/{y}.png'; | |
| mapQuest = new L.TileLayer(mapquestUrl, { | |
| subdomains: ["otile1", "otile2", "otile3", "otile4"], | |
| attribution: 'Tiles Courtesy of <a href="http://www.mapquest.com/" target="_blank">MapQuest</a>. Map data (c) <a href="http://www.openstreetmap.org/" target="_blank">OpenStreetMap</a> contributors, CC-BY-SA.', | |
| maxZoom: 18 | |
| }); | |
| var la_county = new L.LatLng(34.32, -118.23); | |
| map.setView(la_county, 9).addLayer(mapQuest); | |
| var model = new EQModel(); | |
| model.fetch({ | |
| dataType: "jsonp", | |
| data: { | |
| where: "Magnitude > 0", | |
| returnGeometry: true, | |
| outSR: 4326, | |
| outFields: "magnitude", | |
| f: "json" | |
| }, | |
| success: function(model, response) { | |
| var util; | |
| util = new GeoUtil(); | |
| return util.convertEsriToGeo(model.toJSON(), function(err, result) { | |
| var eq_Layer = new L.GeoJSON(); | |
| eq_Layer.on("featureparse", function(evt){ | |
| return evt.layer.bindPopup("Mag: " + evt.properties.Magnitude.toFixed(3)); | |
| }); | |
| map.addLayer(eq_Layer); | |
| return eq_Layer.addGeoJSON(result); | |
| }); | |
| } | |
| }); | |
| })(); | |
| </script> | |
| </head> | |
| </html> |
Author
It looks like that particular service was not working at the moment. I updated it with a different service that performs a little better.
Backbone error.
Error: A "url" property or function must be specified
Source File: http://cdnjs.cloudflare.com/ajax/libs/backbone.js/0.9.2/backbone-min.js
Line: 38
I got another error. I am using Ubuntu 10.10 and firefox 3.6.8.
I using Chrome as well but I don't where to see the errors in Chrome. However, no earthquake display as well.
I guess backbone-min.js error line 38 applies.
What I am suppose to see in this map ... the earthquake point, right? What colour?
Thanks.
Noli
Author
Sorry it took me a while to respond. I'm not able to reproduce the errors. Since this demo pulls in the JavaScript libraries via content delivery networks, an odd connection error can always occur. I can copy/past the raw gist and save it as an HTML file and open it on my desktop and it works. The result is a map of the Los Angeles County area showing point that represent earthquake data taken from an ArcGIS map service and converted to GeoJSON so they can be displayed in Leaflet.js
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I got error running this example.
Error: _ref is undefined
Source File: file:///media/xxxx/ESRI_Leaflet.html
Line: 122
I did not see any earthquake results ... (points geosjon?)