51 lines
1.5 KiB
JavaScript
51 lines
1.5 KiB
JavaScript
'use strict';
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var L = global.L || require('leaflet');
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var Promise = require('lie');
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module.exports = function (url, options) {
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options = options || {};
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var head = document.getElementsByTagName('head')[0];
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var scriptNode = L.DomUtil.create('script', '', head);
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var cbName, ourl, cbSuffix, cancel;
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var out = new Promise(function (resolve, reject) {
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cancel = reject;
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var cbParam = options.cbParam || 'callback';
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if (options.callbackName) {
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cbName = options.callbackName;
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} else {
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cbSuffix = '_' + ('' + Math.random()).slice(2);
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cbName = '_leafletJSONPcallbacks.' + cbSuffix;
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}
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scriptNode.type = 'text/javascript';
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if (cbSuffix) {
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if (!global._leafletJSONPcallbacks) {
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global._leafletJSONPcallbacks = {
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length: 0
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};
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}
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global._leafletJSONPcallbacks.length++;
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global._leafletJSONPcallbacks[cbSuffix] = function (data) {
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head.removeChild(scriptNode);
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delete global._leafletJSONPcallbacks[cbSuffix];
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global._leafletJSONPcallbacks.length--;
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if (!global._leafletJSONPcallbacks.length) {
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delete global._leafletJSONPcallbacks;
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}
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resolve(data);
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};
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}
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if (url.indexOf('?') === -1) {
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ourl = url + '?' + cbParam + '=' + cbName;
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} else {
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ourl = url + '&' + cbParam + '=' + cbName;
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}
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scriptNode.src = ourl;
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}).then(null, function (reason) {
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head.removeChild(scriptNode);
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delete L.Util.ajax.cb[cbSuffix];
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return reason;
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});
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out.abort = cancel;
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return out;
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};
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