75 lines
1.9 KiB
JavaScript
75 lines
1.9 KiB
JavaScript
import { AnonymousObservable, Disposable } from 'rx';
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const root = typeof window !== 'undefined' ? window : {};
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const trash = 'document' in root && root.document.createElement('div');
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function destroy(element) {
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trash.appendChild(element);
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trash.innerHTML = '';
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}
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export function jsonp$(options) {
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let id = 0;
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if (typeof options === 'string') {
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options = { url: options };
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}
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return new AnonymousObservable(function(o) {
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const settings = {
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jsonp: 'JSONPCallback',
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async: true,
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jsonpCallback: 'rxjsjsonpCallbackscallback_' + (id++).toString(36),
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...options
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};
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let script = root.document.createElement('script');
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script.type = 'text/javascript';
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script.async = settings.async;
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script.src = settings.url.replace(settings.jsonp, settings.jsonpCallback);
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root[settings.jsonpCallback] = function(data) {
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root[settings.jsonpCallback].called = true;
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root[settings.jsonpCallback].data = data;
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};
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const handler = function(e) {
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if (e.type === 'load' && !root[settings.jsonpCallback].called) {
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e = { type: 'error' };
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}
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const status = e.type === 'error' ? 400 : 200;
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const data = root[settings.jsonpCallback].data;
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if (status === 200) {
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o.onNext({
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status: status,
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responseType: 'jsonp',
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response: data,
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originalEvent: e
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});
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o.onCompleted();
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} else {
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o.onError({
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type: 'error',
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status: status,
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originalEvent: e
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});
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}
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};
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script.onload = script.onreadystatechanged = script.onerror = handler;
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const head = root.document.getElementsByTagName('head')[0] ||
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root.document.documentElement;
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head.insertBefore(script, head.firstChild);
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return Disposable.create(() => {
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script.onload = script.onreadystatechanged = script.onerror = null;
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destroy(script);
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script = null;
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});
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});
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}
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