I have this code:
if (ol.proj.proj4 && ol.proj.proj4.register) { ol.proj.proj4.register(proj4); }
var features = new ol.format.GeoJSON().readFeatures(
$.ajax({
type: 'GET',
url: 'readGeojson.php',
//data: { get_param: 'value' },
dataType: 'json',
success: function (data, status) {
console.log(data);
geojson = data
}
})
);
function reverseTransform(coordinates, output, dimensions) {
var dims = dimensions || 2;
for (var i=0; i<coordinates.length; i+=dims) {
var j = coordinates[i];
coordinates[i] = coordinates[i+1];
coordinates[i+1] = j;
}
return coordinates;
}
features.forEach(function(feature){
feature.setId(undefined);
feature.getGeometry().transform('EPSG:31700', 'EPSG:3857');
});
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM(),
}),
new ol.layer.Vector({
source: new ol.source.Vector({
features: features
})
})
],
target: 'map',
controls: ol.control.defaults({
attributionOptions:
({
collapsible: false
})
}).extend([
new ol.control.OverviewMap(),
new ol.control.FullScreen(),
new ol.control.ScaleLine()
]),
interactions: [
new ol.interaction.DragRotateAndZoom(),
new ol.interaction.MouseWheelZoom(),
new ol.interaction.DragPan(),
new ol.interaction.DoubleClickZoom()
],
view: new ol.View({
center: ol.proj.transform([698282.236, 377375.758], 'EPSG:31700', 'EPSG:3857'),
zoom: 14,
})
});
I want to get a GeoJSON from the ajax database and display co-ordinates on the automatic map of how to load the page in OpenLayers.
I tried this way:
var features = new ol.format.GeoJSON().readFeatures(
$.ajax({
type: 'GET',
url: 'readGeojson.php',
//data: { get_param: 'value' },
dataType: 'json',
success: function (data, status) {
console.log(data);
geojson = data
}
})
);
And I got this error from the code:
Uncaught Error: Unsupported GeoJSON type: undefined
at Af (GeoJSON.js:299)
at e.readFeatureFromObject (GeoJSON.js:110)
at e.readFeaturesFromObject (GeoJSON.js:146)
at e.readFeatures (JSONFeature.js:56)
at get_map (test1.php:3410)
at HTMLButtonElement.onclick (test1.php:18) Af @ GeoJSON.js:299 e.readFeatureFromObject @ GeoJSON.js:110 e.readFeaturesFromObject @ GeoJSON.js:146 e.readFeatures @ JSONFeature.js:56 get_map @ test1.php:3410 onclick @ test1.php:18
This code generate GeoJSON :
$sql = "SELECT *, ST_AsGeoJSON(geometry) AS geojson FROM a_final order by ST_XMin(geometry) LIMIT 10";
// echo $sql;
$dbcon = pg_connect("host=localhost dbname=test user=postgres password=72342");
$query = pg_query($dbcon,$sql);
$geojson = array(
'type' => 'FeatureCollection',
'features' => array()
);
while($edge=pg_fetch_assoc($query)) {
$feature = array
(
'type' => 'Feature',
'geometry' => json_decode($edge['geojson'], true),
'crs' => array(
'type' => 'EPSG',
'properties' => array('code' => '31700')
),
'geometry_name' => 'wkb_geometry',
'properties' => array
(
'ogc_fid' => htmlspecialchars($edge['ogc_fid']),
'area_id' => $edge['area_id'],
'building_id' => $edge['building_id'],
'type' => $edge['type'],
'area' => $edge['area'],
'owner' => $edge['owner'],
'description' => $edge['description'],
'administration' => $edge['administration'],
'address' => $edge['address'],
'property' => $edge['property'],
'layer' => $edge['layer'],
'extendedentity' => $edge['extendedentity'],
'linetype' => $edge['linetype'],
'entityhandle' => $edge['entityhandle'],
'text' => $edge['text'],
'wkb_geometry' => $edge['geometry']
)
);
array_push($geojson['features'], $feature);
}
pg_close($dbcon);
header('Content-type: application/json',true);
echo json_encode($geojson);
I tried to directly copy GeoJSON into the pickup variable and go so ….
GeoJSON:
{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":"LineString","coordinates":[[698282.236,377375.758],[698289.591,377372.136],[698183.88,377182.298],[698182.72,377197.045],[698282.236,377375.758]]},"crs":{"type":"EPSG","properties":{"code":"31700"}},"geometry_name":"wkb_geometry","properties":{"ogc_fid":"","area_id":null,"building_id":null,"type":null,"area":null,"owner":null,"description":null,"administration":null,"address":null,"property":null,"layer":"Green Area","extendedentity":null,"linetype":null,"entityhandle":null,"text":null,"wkb_geometry":"01020000000500000000FED478544F2541002731087F081741408D972E634F25418195438B70081741295C8FC28F4E254181E92631790517410AD7A3708D4E2541027B142EB405174100FED478544F2541002731087F081741"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[698289.591,377372.136],[698295.211,377369.369],[698184.767,377171.028],[698183.88,377182.298],[698289.591,377372.136]]},"crs":{"type":"EPSG","properties":{"code":"31700"}},"geometry_name":"wkb_geometry","properties":{"ogc_fid":"","area_id":null,"building_id":null,"type":null,"area":null,"owner":null,"description":null,"administration":null,"address":null,"property":null,"layer":"Green Area","extendedentity":null,"linetype":null,"entityhandle":null,"text":null,"wkb_geometry":"010200000005000000408D972E634F25418195438B700817411E31086C6E4F2541C022DB79650817416039B488914E25414108AC1C4C051741295C8FC28F4E254181E9263179051741408D972E634F25418195438B70081741"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[698307.17,377363.481],[698311.314,377361.44],[698321.211,377356.567],[698188.867,377118.9],[698185.72,377158.908],[698301.257,377366.392],[698307.17,377363.481]]},"crs":{"type":"EPSG","properties":{"code":"31700"}},"geometry_name":"wkb_geometry","properties":{"ogc_fid":"","area_id":null,"building_id":null,"type":null,"area":null,"owner":null,"description":null,"administration":null,"address":null,"property":null,"layer":"Green Area","extendedentity":null,"linetype":null,"entityhandle":null,"text":null,"wkb_geometry":"0102000000070000007F3D0A57864F25417F438BEC4D081741A09BC4A08E4F2541415C8FC2450817412131086CA24F254102A69B44320817417F6CE7BB994E25419A9999997B0417410AD7A370934E254180C0CAA11B051741FF8095837A4F2541C0726891590817417F3D0A57864F25417F438BEC4D081741"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[698191.282,377088.192],[698336.526,377349.026],[698348.895,377342.935],[698195.874,377068.133],[698192.739,377069.67],[698191.282,377088.192]]},"crs":{"type":"EPSG","properties":{"code":"31700"}},"geometry_name":"wkb_geometry","properties":{"ogc_fid":"","area_id":null,"building_id":null,"type":null,"area":null,"owner":null,"description":null,"administration":null,"address":null,"property":null,"layer":"Green Area","extendedentity":null,"linetype":null,"entityhandle":null,"text":null,"wkb_geometry":"010200000006000000E04D62909E4E254101A69BC40004174140DF4F0DC14F25417FBE9F1A14081741A0703DCAD94F2541BFA370BDFB071741A0ED7CBFA74E254102273188B00317413F355E7AA14E2541007B14AEB6031741E04D62909E4E254101A69BC400041741"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[698223.512,377072.661],[698215.605,377058.461],[698210.805,377060.814],[698218.769,377075.117],[698363.812,377335.59],[698368.608,377333.228],[698223.512,377072.661]]},"crs":{"type":"EPSG","properties":{"code":"31700"}},"geometry_name":"wkb_geometry","properties":{"ogc_fid":"","area_id":null,"building_id":null,"type":null,"area":null,"owner":null,"description":null,"administration":null,"address":null,"property":null,"layer":"Green Area","extendedentity":null,"linetype":null,"entityhandle":null,"text":null,"wkb_geometry":"01020000000700000021DD2406DF4E2541032FDDA4C2031741608FC235CF4E2541426210D889031741C1F5289CC54E25414037894193031741415EBA89D54E254100D9CE77CC031741C076BE9FF74F2541C3F5285CDE071741A0C64B370150254100D578E9D407174121DD2406DF4E2541032FDDA4C2031741"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[698227.007,377070.852],[698219.142,377056.727],[698215.605,377058.461],[698223.512,377072.661],[698368.608,377333.228],[698372.141,377331.489],[698227.007,377070.852]]},"crs":{"type":"EPSG","properties":{"code":"31700"}},"geometry_name":"wkb_geometry","properties":{"ogc_fid":"","area_id":null,"building_id":null,"type":null,"area":null,"owner":null,"description":null,"administration":null,"address":null,"property":null,"layer":"Green Area","extendedentity":null,"linetype":null,"entityhandle":null,"text":null,"wkb_geometry":"01020000000700000000819503E64E254141B07268BB0317416139B448D64E254141B072E882031741608FC235CF4E2541426210D88903174121DD2406DF4E2541032FDDA4C2031741A0C64B370150254100D578E9D4071741E126314808502541816ABCF4CD07174100819503E64E254141B07268BB031741"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[698230.934,377068.819],[698223.116,377054.779],[698219.142,377056.727],[698227.007,377070.852],[698372.141,377331.489],[698376.112,377329.534],[698230.934,377068.819]]},"crs":{"type":"EPSG","properties":{"code":"31700"}},"geometry_name":"wkb_geometry","properties":{"ogc_fid":"","area_id":null,"building_id":null,"type":null,"area":null,"owner":null,"description":null,"administration":null,"address":null,"property":null,"layer":"Green Area","extendedentity":null,"linetype":null,"entityhandle":null,"text":null,"wkb_geometry":"010200000007000000803F35DEED4E254180EFA746B3031741205A643BDE4E2541022DB21D7B0317416139B448D64E254141B072E88203174100819503E64E254141B07268BB031741E126314808502541816ABCF4CD07174161105839105025417FE5D022C6071741803F35DEED4E254180EFA746B3031741"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[698237.435,377065.453],[698229.695,377051.554],[698223.116,377054.779],[698230.934,377068.819],[698376.112,377329.534],[698377.635,377328.784],[698382.096,377326.587],[698382.684,377326.297],[698237.435,377065.453]]},"crs":{"type":"EPSG","properties":{"code":"31700"}},"geometry_name":"wkb_geometry","properties":{"ogc_fid":"","area_id":null,"building_id":null,"type":null,"area":null,"owner":null,"description":null,"administration":null,"address":null,"property":null,"layer":"Green Area","extendedentity":null,"linetype":null,"entityhandle":null,"text":null,"wkb_geometry":"010200000009000000DF51B8DEFA4E2541803BDFCFA50317413F0AD763EB4E2541C0C64B376E031741205A643BDE4E2541022DB21D7B031741803F35DEED4E254180EFA746B303174161105839105025417FE5D022C60717415FB81E45135025417FE5D022C307174180E926311C50254140871659BA071741803F355E1D50254182C42030B9071741DF51B8DEFA4E2541803BDFCFA5031741"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[698241.362,377063.42],[698233.669,377049.605],[698229.695,377051.554],[698237.435,377065.453],[698382.684,377326.297],[698386.655,377324.342],[698241.362,377063.42]]},"crs":{"type":"EPSG","properties":{"code":"31700"}},"geometry_name":"wkb_geometry","properties":{"ogc_fid":"","area_id":null,"building_id":null,"type":null,"area":null,"owner":null,"description":null,"administration":null,"address":null,"property":null,"layer":"Green Area","extendedentity":null,"linetype":null,"entityhandle":null,"text":null,"wkb_geometry":"010200000007000000601058B9024F2541027B14AE9D031741002B8756F34E2541BF1E856B660317413F0AD763EB4E2541C0C64B376E031741DF51B8DEFA4E2541803BDFCFA5031741803F355E1D50254182C42030B907174100295C4F25502541823F355EB1071741601058B9024F2541027B14AE9D031741"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[698278.389,377044.249],[698271.143,377031.236],[698233.669,377049.605],[698241.362,377063.42],[698386.655,377324.342],[698424.092,377305.908],[698278.389,377044.249]]},"crs":{"type":"EPSG","properties":{"code":"31700"}},"geometry_name":"wkb_geometry","properties":{"ogc_fid":"","area_id":null,"building_id":null,"type":null,"area":null,"owner":null,"description":null,"administration":null,"address":null,"property":null,"layer":"Green Area","extendedentity":null,"linetype":null,"entityhandle":null,"text":null,"wkb_geometry":"01020000000700000000022BC74C4F254140DBF9FE50031741C04B37493E4F254101FCA9F11C031741002B8756F34E2541BF1E856B66031741601058B9024F2541027B14AE9D03174100295C4F25502541823F355EB1071741C09F1A2F7050254180C0CAA16707174100022BC74C4F254140DBF9FE50031741"}}]}
My GeoJSON its this:
{"type":"FeatureCollection","features":[{"type":"Feature","id":"2","geometry":{"type":"LineString","coordinates":[[698282.236,377375.758],[698289.591,377372.136],[698183.88,377182.298],[698182.72,377197.045],[698282.236,377375.758]]},"crs":{"type":"EPSG","properties":{"code":"31700"}},"geometry_name":"wkb_geometry","properties":{"ogc_fid":"2","area_id":"2","building_id":"2","type":"test","area":"test","owner":"test","description":"test","administration":"test","address":"test","property":"test","layer":"Green Area","extendedentity":null,"linetype":"test","entityhandle":null,"text":"test","wkb_geometry":"01020000000500000000FED478544F2541002731087F081741408D972E634F25418195438B70081741295C8FC28F4E254181E92631790517410AD7A3708D4E2541027B142EB405174100FED478544F2541002731087F081741"}}]}
Best Answer
Below is code that works. It's almost exact copy of code from question, except that
EPSG:31700definition is added and geojson data is imported throughgeojsonvariable.Here is the result:
EDIT1: If you want to read data with jquery ajax, where data is stored in file
data.geojsonon server, then replace linewith