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Provide GeoJSON loader function to prevent 403's #34

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merged 1 commit into from
Aug 19, 2019
Merged

Provide GeoJSON loader function to prevent 403's #34

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24 changes: 22 additions & 2 deletions src/instance.js
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Original file line number Diff line number Diff line change
Expand Up @@ -27,9 +27,29 @@ const createInstance = ({ target, options }) => {
title = 'geojson', url, color, visible = true,
}) {
const style = styles(color);
const format = new GeoJSON();
const source = new VectorSource({
url,
format: new GeoJSON(),
format,
// Supply a loader function so we can be sure xhr.withCredentials === true.
loader(extent, resolution, featureProjection) {
const xhr = new XMLHttpRequest();
const onError = () => source.removeLoadedExtent(extent);
xhr.open('GET', url);
xhr.withCredentials = true;
xhr.onerror = onError;
xhr.onload = () => {
if (xhr.status === 200) {
const features = format.readFeatures(xhr.responseText, {
extent,
featureProjection,
});
source.addFeatures(features);
} else {
onError();
}
};
xhr.send();
},
});
const layer = new VectorLayer({
title,
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