99 lines
3.3 KiB
JavaScript
99 lines
3.3 KiB
JavaScript
/**
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* @module ol/featureloader
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*/
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import {nullFunction} from './index.js';
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import FormatType from './format/FormatType.js';
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import _ol_xml_ from './xml.js';
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/**
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* @param {string|ol.FeatureUrlFunction} url Feature URL service.
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* @param {ol.format.Feature} format Feature format.
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* @param {function(this:ol.VectorTile, Array.<ol.Feature>, ol.proj.Projection, ol.Extent)|function(this:ol.source.Vector, Array.<ol.Feature>)} success
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* Function called with the loaded features and optionally with the data
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* projection. Called with the vector tile or source as `this`.
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* @param {function(this:ol.VectorTile)|function(this:ol.source.Vector)} failure
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* Function called when loading failed. Called with the vector tile or
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* source as `this`.
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* @return {ol.FeatureLoader} The feature loader.
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*/
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export function loadFeaturesXhr(url, format, success, failure) {
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return (
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/**
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* @param {ol.Extent} extent Extent.
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* @param {number} resolution Resolution.
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* @param {ol.proj.Projection} projection Projection.
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* @this {ol.source.Vector|ol.VectorTile}
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*/
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function(extent, resolution, projection) {
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var xhr = new XMLHttpRequest();
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xhr.open('GET',
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typeof url === 'function' ? url(extent, resolution, projection) : url,
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true);
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if (format.getType() == FormatType.ARRAY_BUFFER) {
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xhr.responseType = 'arraybuffer';
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}
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/**
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* @param {Event} event Event.
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* @private
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*/
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xhr.onload = function(event) {
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// status will be 0 for file:// urls
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if (!xhr.status || xhr.status >= 200 && xhr.status < 300) {
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var type = format.getType();
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/** @type {Document|Node|Object|string|undefined} */
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var source;
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if (type == FormatType.JSON || type == FormatType.TEXT) {
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source = xhr.responseText;
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} else if (type == FormatType.XML) {
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source = xhr.responseXML;
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if (!source) {
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source = _ol_xml_.parse(xhr.responseText);
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}
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} else if (type == FormatType.ARRAY_BUFFER) {
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source = /** @type {ArrayBuffer} */ (xhr.response);
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}
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if (source) {
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success.call(this, format.readFeatures(source,
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{featureProjection: projection}),
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format.readProjection(source), format.getLastExtent());
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} else {
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failure.call(this);
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}
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} else {
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failure.call(this);
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}
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}.bind(this);
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/**
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* @private
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*/
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xhr.onerror = function() {
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failure.call(this);
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}.bind(this);
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xhr.send();
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}
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);
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}
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/**
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* Create an XHR feature loader for a `url` and `format`. The feature loader
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* loads features (with XHR), parses the features, and adds them to the
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* vector source.
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* @param {string|ol.FeatureUrlFunction} url Feature URL service.
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* @param {ol.format.Feature} format Feature format.
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* @return {ol.FeatureLoader} The feature loader.
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* @api
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*/
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export function xhr(url, format) {
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return loadFeaturesXhr(url, format,
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/**
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* @param {Array.<ol.Feature>} features The loaded features.
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* @param {ol.proj.Projection} dataProjection Data projection.
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* @this {ol.source.Vector}
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*/
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function(features, dataProjection) {
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this.addFeatures(features);
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}, /* FIXME handle error */ nullFunction);
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}
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