41 lines
1.2 KiB
JavaScript
41 lines
1.2 KiB
JavaScript
/**
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* @module ol/net
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*/
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import {getUid} from './util.js';
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/**
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* Simple JSONP helper. Supports error callbacks and a custom callback param.
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* The error callback will be called when no JSONP is executed after 10 seconds.
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*
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* @param {string} url Request url. A 'callback' query parameter will be
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* appended.
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* @param {Function} callback Callback on success.
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* @param {function()=} opt_errback Callback on error.
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* @param {string=} opt_callbackParam Custom query parameter for the JSONP
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* callback. Default is 'callback'.
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*/
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export function jsonp(url, callback, opt_errback, opt_callbackParam) {
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const script = document.createElement('script');
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const key = 'olc_' + getUid(callback);
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function cleanup() {
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delete window[key];
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script.parentNode.removeChild(script);
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}
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script.async = true;
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script.src = url + (url.indexOf('?') == -1 ? '?' : '&') +
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(opt_callbackParam || 'callback') + '=' + key;
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const timer = setTimeout(function() {
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cleanup();
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if (opt_errback) {
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opt_errback();
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}
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}, 10000);
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window[key] = function(data) {
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clearTimeout(timer);
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cleanup();
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callback(data);
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};
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document.getElementsByTagName('head')[0].appendChild(script);
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}
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