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Code Issues Releases Wiki Activity

Merge branch 'file-reader-support' of git://github.com/mcclintock-lab/js-shapefile-to-geojson

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This commit is contained in:
Marc Harter 2013-09-09 22:08:42 -05:00
commit caaf49ad47
3 changed files with 187 additions and 41 deletions
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44
dbf.js
View File

@ -56,6 +56,45 @@
} }
var DBF = function(url, callback){ var DBF = function(url, callback){
if (!!url.lastModifiedDate)
this.handleFile(url, callback);
else
this.handleUri(url, callback);
}
DBF.prototype = {
constructor: DBF,
handleFile: function(file, callback) {
this.callback = callback;
if (!!window.FileReader) {
var reader = new FileReader();
} else {
var reader = new FileReaderSync();
}
reader.onload = (function(that){
return function(e){
that.onFileLoad(e.target.result)
}
})(this);
if (!!window.FileReader) {
reader.readAsBinaryString(file);
} else {
this.onFileLoad(reader.readAsBinaryString(file));
}
},
onFileLoad: function(data) {
this.stream = new Gordon.Stream(data)
this.readFileHeader()
this.readFieldDescriptions()
this.readRecords()
this._postMessage()
},
handleUri: function(url, callback) {
var xhr = new XMLHttpRequest(); var xhr = new XMLHttpRequest();
xhr.open("GET", url, false) xhr.open("GET", url, false)
@ -73,10 +112,7 @@
this.readRecords() this.readRecords()
this._postMessage() this._postMessage()
} },
DBF.prototype = {
constructor: DBF,
_postMessage: function() { _postMessage: function() {
var data = { var data = {
header: this.header, header: this.header,

65
files.html Normal file
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@ -0,0 +1,65 @@
<!doctype html>
<html>
<head>
<title>js-shapefile-to-geojson Demo Page</title>
<style>
html, body {
height: 100%;
width: 100%;
}
#map {
height: 400px;
background-color: #eee;
}
</style>
</head>
<body>
<a href="http://github.com/wavded/js-shapefile-to-geojson"><img style="position: absolute; top: 0; right: 0; border: 0;" src="http://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png" alt="Fork me on GitHub" /></a>
<h2>js-shapefile-to-geojson Demo Page</h2>
<p>Pure client-side JavaScript (no server side code) parsing of shapefiles and dbase files to GeoJSON format displayed using OpenLayers.</p>
<div id="map"></div>
<p>View project at <a href="http://github.com/wavded/js-shapefile-to-geojson">http://github.com/wavded/js-shapefile-to-geojson</a>.
<script src="http://rs1.adc4gis.com/js/openlayers/2.9.1/OpenLayers-Proj4.js"></script>
<script src="stream.js"></script>
<script src="shapefile.js"></script>
<script src="dbf.js"></script>
<script type="text/javascript">
OpenLayers._getScriptLocation = function(){
return "http://rs1.adc4gis.com/js/openlayers/2.9.1/";
};
var map = new OpenLayers.Map("map",{allOverlays: true}),
parser = new OpenLayers.Format.GeoJSON(),
vector = new OpenLayers.Layer.Vector("Converted")
map.addLayer(vector);
var onchange = function(e) {
var shpFile = document.getElementById('shp').files[0];
var dbfFile = document.getElementById('dbf').files[0];
if (shpFile) {
var opts = { shp: shpFile };
if (dbfFile) {
opts['dbf'] = dbfFile;
}
shapefile = new Shapefile(opts, function(data){
var features = parser.read(data.geojson);
vector.addFeatures(features);
map.zoomToExtent(vector.getDataExtent());
console.log(data);
});
}
}
document.body.onload = function(){
document.getElementById('shp').addEventListener('change', onchange, false);
document.getElementById('dbf').addEventListener('change', onchange, false);
}
</script>
<br>
<br>
.shp <input id="shp" type="file" name=".shp" />
.dbf <input id="dbf" type="file" name=".dbf" />
</body>
</html>

55
shapefile.js
View File

@ -11,6 +11,8 @@
if (!worker) { if (!worker) {
var path = (o.jsRoot || "") + "shapefile.js" var path = (o.jsRoot || "") + "shapefile.js"
var w = worker = this.worker = new Worker(path) var w = worker = this.worker = new Worker(path)
} else {
var w = worker
} }
w.onmessage = function(e){ w.onmessage = function(e){
@ -64,9 +66,20 @@
} }
var Shapefile = function(o,callback){ var Shapefile = function(o,callback){
var o = typeof o == "string" ? {shp: o} : o
this.callback = callback
if (!!o.shp.lastModifiedDate)
this.handleFile(o);
else
this.handleUri(o);
}
Shapefile.prototype = {
constructor: Shapefile,
handleUri: function(o) {
var xhr = new XMLHttpRequest(), var xhr = new XMLHttpRequest(),
that = this, that = this
o = typeof o == "string" ? {shp: o} : o
xhr.open("GET", o.shp, false) xhr.open("GET", o.shp, false)
xhr.overrideMimeType("text/plain; charset=x-user-defined") xhr.overrideMimeType("text/plain; charset=x-user-defined")
@ -77,7 +90,6 @@
this.url = o.shp this.url = o.shp
this.stream = new Gordon.Stream(xhr.responseText) this.stream = new Gordon.Stream(xhr.responseText)
this.callback = callback
this.readFileHeader() this.readFileHeader()
this.readRecords() this.readRecords()
@ -90,10 +102,43 @@
that._postMessage() that._postMessage()
}) })
else this._postMessage() else this._postMessage()
},
handleFile: function(o) {
this.options = o
if (!!window.FileReader) {
var reader = new FileReader();
} else {
var reader = new FileReaderSync();
} }
Shapefile.prototype = { reader.onload = (function(that){
constructor: Shapefile, return function(e){
that.onFileLoad(e.target.result)
}
})(this);
if (!!window.FileReader) {
reader.readAsBinaryString(o.shp);
} else {
this.onFileLoad(reader.readAsBinaryString(o.shp));
}
},
onFileLoad: function(data) {
this.stream = new Gordon.Stream(data)
this.readFileHeader()
this.readRecords()
this.formatIntoGeoJson()
if(this.options.dbf) this.dbf = IN_WORKER ?
null :
new DBF(this.options.dbf,function(data){
that.addDBFDataToGeoJSON(data)
that._postMessage()
})
else this._postMessage()
},
_postMessage: function() { _postMessage: function() {
var data = { var data = {
header: this.header, header: this.header,