Created
May 31, 2011 08:02
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GPX parsing with JavaScript
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| #map_canvas | |
| { | |
| width: 400px; | |
| height: 400px; | |
| } | |
| </style> | |
| <script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script> | |
| <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script> | |
| <script> | |
| // Start DOM Parser | |
| if(typeof(DOMParser) == 'undefined') { | |
| DOMParser = function() {} | |
| DOMParser.prototype.parseFromString = function(str, contentType) { | |
| if(typeof(ActiveXObject) != 'undefined') | |
| { | |
| var xmldata = new ActiveXObject('MSXML.DomDocument'); | |
| xmldata.async = false; | |
| xmldata.loadXML(str); | |
| return xmldata; | |
| } else if(typeof(XMLHttpRequest) != 'undefined') | |
| { | |
| var xmldata = new XMLHttpRequest; | |
| if(!contentType) { | |
| contentType = 'application/xml'; | |
| } | |
| xmldata.open('GET', 'data:' + contentType + ';charset=utf-8,' + encodeURIComponent(str), false); | |
| if(xmldata.overrideMimeType) { | |
| xmldata.overrideMimeType(contentType); | |
| } | |
| xmldata.send(null); | |
| return xmldata.responseXML; | |
| } | |
| } | |
| } | |
| function loadFile(input, onload_func) { | |
| var input, file, fr; | |
| if (typeof window.FileReader !== 'function') { | |
| alert("The file API isn't supported on this browser yet."); | |
| return; | |
| } | |
| if (!input) { | |
| alert("Um, couldn't find the fileinput element."); | |
| } | |
| else if (!input.files) { | |
| alert("This browser doesn't seem to support the `files` property of file inputs."); | |
| } | |
| else if (!input.files[0]) { | |
| balert("Please select a file before clicking 'Load'"); | |
| } | |
| else { | |
| file = input.files[0]; | |
| fr = new FileReader(); | |
| fr.onload = receivedText; | |
| fr.readAsText(file); | |
| } | |
| function receivedText() { | |
| onload_func(fr.result); | |
| } | |
| } | |
| function parseXml(xmlstr) | |
| { | |
| var doc = new DOMParser().parseFromString(xmlstr, "text/xml"); | |
| return get_gpx_data(doc.documentElement); | |
| } | |
| function get_gpx_data(node, result) { | |
| if(!result) | |
| result = { segments: [] }; | |
| switch(node.nodeName) | |
| { | |
| case "name": | |
| var p = $("<p />"); | |
| p.text(node.nodeName + " = " + node.textContent); | |
| result.name = node.textContent; | |
| $("#log").append(p); | |
| break; | |
| case "trkseg": | |
| var segment = []; | |
| result.segments.push(segment) | |
| for(var i=0; i<node.childNodes.length; i++) | |
| { | |
| var snode = node.childNodes[i]; | |
| if(snode.nodeName == "trkpt") | |
| { | |
| var trkpt = { loc: [ parseFloat(snode.attributes["lat"].value), parseFloat(snode.attributes["lon"].value) ] }; | |
| for(var j=0; j<snode.childNodes.length; j++) | |
| { | |
| var ssnode = snode.childNodes[j]; | |
| switch(ssnode.nodeName) | |
| { | |
| case "time": | |
| trkpt.time = new Date(ssnode.childNodes[0].data); | |
| break; | |
| case "ele": | |
| trkpt.ele = parseFloat(ssnode.childNodes[0].data); | |
| break; | |
| } | |
| } | |
| segment.push(trkpt) | |
| } | |
| } | |
| break; | |
| } | |
| for(var i=0; i<node.childNodes.length; i++) | |
| { | |
| get_gpx_data(node.childNodes[i], result); | |
| } | |
| return result; | |
| } | |
| function convert_to_latlng(segment) | |
| { | |
| var result = []; | |
| for(var i=0; i<segment.length; i++) | |
| { | |
| result.push(new google.maps.LatLng(segment[i].loc[0], segment[i].loc[1])); | |
| } | |
| return result; | |
| } | |
| function get_bounds(gpx_data) | |
| { | |
| var result = { s: 90.0, n: -90, e: -180.0, w: 180.0 }; | |
| for(var i=0; i<gpx_data.segments.length; i++) | |
| { | |
| for(var j=0; j<gpx_data.segments[i].length; j++) | |
| { | |
| var point = gpx_data.segments[i][j]; | |
| if(result.s > point.loc[0]) result.s = point.loc[0]; | |
| if(result.n < point.loc[0]) result.n = point.loc[0]; | |
| if(result.e < point.loc[1]) result.e = point.loc[1]; | |
| if(result.w > point.loc[1]) result.w = point.loc[1]; | |
| } | |
| } | |
| return result; | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <form action='#' id="form" > | |
| <input type='file' id='fileinput'> | |
| <input type='submit' id='btnLoad' value='Load'> | |
| </form> | |
| <div id="log"> | |
| </div> | |
| <div id="map_canvas"></div> | |
| <script> | |
| $("#fileinput").change(function() { | |
| loadFile($("#fileinput")[0], function(xml) { | |
| result = parseXml(xml); | |
| var bounds = get_bounds(result); | |
| var points = convert_to_latlng(result.segments[0]); | |
| var myLatlng = new google.maps.LatLng(-34.397, 150.644); | |
| var myOptions = { | |
| zoom: 8, | |
| center: myLatlng, | |
| mapTypeId: google.maps.MapTypeId.ROADMAP | |
| } | |
| var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions); | |
| var southWest = new google.maps.LatLng(bounds.s,bounds.w); | |
| var northEast = new google.maps.LatLng(bounds.n,bounds.e); | |
| var bounds = new google.maps.LatLngBounds(southWest,northEast); | |
| map.fitBounds(bounds); | |
| var flightPath = new google.maps.Polyline({ | |
| path: points, | |
| strokeColor: "#FF0000", | |
| strokeOpacity: 1.0, | |
| strokeWeight: 2 | |
| }); | |
| flightPath.setMap(map); | |
| for(var j=0; j<points.length; j++) | |
| { | |
| var marker = new google.maps.Marker({ | |
| position: points[j], | |
| title:"Hello World!" | |
| }); | |
| marker.setMap(map); | |
| } | |
| }); | |
| }); | |
| </script> | |
| </body> | |
| <html> |
Can you tell me that how to get tracks data from it
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can you explain the code please