[OpenLayers-Users] feature attribute onload of GeoJSON layer

[Robert Sanson]

Hi Aditya

There are a couple of ways. You could either use the OpenLayers GeoJSON format reader to read the response into features that are added to your layer:

var geojson_format = new OpenLayers.Format.GeoJSON();
var olgeo = geojson_format.read(response.responseText);
var geol = new OpenLayers.Layer.Vector("MyLayer",
				{isBaseLayer: false,
				styleMap: geoStyles,
				rendererOptions: {zIndexing: true},
				extractAttributes: true,
				eventListeners: layerListeners});
geol.addFeatures(olgeo);

//All the attributes will now be properties of the features which you than select and display
var layerListeners = {
    featureclick: function(e) {
                   e.feature.renderIntent = "select";
                   e.feature.layer.drawFeature(e.feature);
                   alert(e.feature.attributes.wardid+"|"+e.feature.attributes.ward_no+"|"+e.feature.attributes.ward_name);
    }
};

or you could parse the response within a callback function:

function mycallback(response) {
    var wardid = response.responseText.features[0].properties.wardid;
    var ward_no = response.responseText.features[0].properties.ward_no;
    var ward_name = response.responseText.features[0].properties.ward_name;
    alert(wardid+"|"+ward_no+"|"+ward_name);
}

Regards,

Robert

>>> adityakumar529 <adityakumar529 at gmail.com> 15/08/2013 12:54 a.m. >>>
Hi Users,
    I am loading a layer which is coming as  a result of  query passed to
server. As the layer loads I want the attributes of the layer in alert.
Following is the GeoJSON layer
http://api.ichangemycity.com/readwardboundary?longitude=77.66083409999999&latitude=13.0265715.


Thanks in advance.
Aditya Kumar



-----
GIS Developer
India Urban Space Foundation
--
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