Geographic Information Systems Asked by brandon p on December 2, 2020
Here is what my site looks like: https://brandonlprice.github.io/landrecords/. How can I access the feature properties for a layer when running a find or a query on a layer? I have the the feature.properties.length being displayed in a .innerhtml to show the total count of features returned. I also would like to be able to display the individual attributes for each feature in a layer in a .innerhtml when they are clicked on in the map. The onEachFeature would be one way although I do not know how to link that to the query.run or find.run. How can I do that? Are there any other way to access the individual attributes. My query snippet are below.
Query:
function tmqueryFunction() {
latlng = markerLayer.getLatLng();
tmbufferResult.clearLayers();
document.getElementById("tractcounts").innerHTML = '';
if (document.getElementById("tm1").checked == true){
tmquery.nearby(latlng, distance);
tmquery.run(function (error, featureCollection, response) {
if (error) {
console.log(error);
return;
}
tmbufferResult.addData(featureCollection).addTo(map)
document.getElementById('tractcounts').innerHTML = 'Tract Map Records: ' +
featureCollection.features.length;
});
map.fitBounds(L.geoJSON(featureCollection).getBounds());
});
}
}
You can access feature properties by iterating through layers/features with .eachLayer
method. Feature properties are accessible through layer feature
property.
In your case, if you would want to attach popup with some of the feature properties to each layer/feature, your code could look something like this:
function tmqueryFunction() {
if (!markerLayer) return;
latlng = markerLayer.getLatLng();
tmbufferResult.clearLayers();
document.getElementById("tractcounts").innerHTML = '';
if (!document.getElementById("tm1").checked) return;
tmquery.nearby(latlng, distance);
tmquery.run(function (error, featureCollection, response) {
if (error) {
console.log(error);
return;
}
tmbufferResult.addData(featureCollection).addTo(map)
document.getElementById('tractcounts').innerHTML = 'Tract Map Records: ' + featureCollection.features.length;
tmbufferResult.eachLayer(function(layer) {
layer.bindPopup(
'REFERENCE: ' + layer.feature.properties.REFERENCE + '<br>' +
'SUB_NAME: ' + layer.feature.properties.SUB_NAME);
});
map.fitBounds(L.geoJSON(featureCollection).getBounds());
});
}
Here is an example of such popup on your map:
Answered by TomazicM on December 2, 2020
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