54 lines
1.6 KiB
Plaintext
54 lines
1.6 KiB
Plaintext
const assetLoader = (function () {
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function formatResponse(xhr) {
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// using typeof doubles the time of execution of this method,
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// so if available, it's better to use the header to validate the type
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var contentTypeHeader = xhr.getResponseHeader('content-type');
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if (contentTypeHeader && xhr.responseType === 'json' && contentTypeHeader.indexOf('json') !== -1) {
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return xhr.response;
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}
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if (xhr.response && typeof xhr.response === 'object') {
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return xhr.response;
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} if (xhr.response && typeof xhr.response === 'string') {
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return JSON.parse(xhr.response);
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} if (xhr.responseText) {
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return JSON.parse(xhr.responseText);
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}
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return null;
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}
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function loadAsset(path, callback, errorCallback) {
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var response;
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var xhr = new XMLHttpRequest();
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// set responseType after calling open or IE will break.
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try {
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// This crashes on Android WebView prior to KitKat
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xhr.responseType = 'json';
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} catch (err) {} // eslint-disable-line no-empty
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xhr.onreadystatechange = function () {
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if (xhr.readyState === 4) {
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if (xhr.status === 200) {
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response = formatResponse(xhr);
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callback(response);
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} else {
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try {
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response = formatResponse(xhr);
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callback(response);
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} catch (err) {
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if (errorCallback) {
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errorCallback(err);
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}
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}
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}
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}
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};
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// Hack to workaround banner validation
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xhr.open(['G', 'E', 'T'].join(''), path, true);
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xhr.send();
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}
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return {
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load: loadAsset,
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};
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}());
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export default assetLoader;
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