leaflet-control-geocoder/src/util.js

Extendable geocoder with builtin support for Nominatim, Bing, Google, Mapbox, Photon, What3Words, MapQuest, Mapzen

var L = require('leaflet'),
	lastCallbackId = 0,
	htmlEscape = (function() {
		// Adapted from handlebars.js
		// https://github.com/wycats/handlebars.js/
		var badChars = /[&<>"'`]/g;
		var possible = /[&<>"'`]/;
		var escape = {
		  '&': '&amp;',
		  '<': '&lt;',
		  '>': '&gt;',
		  '"': '&quot;',
		  '\'': '&#x27;',
		  '`': '&#x60;'
		};

		function escapeChar(chr) {
		  return escape[chr];
		}

		return function(string) {
			if (string == null) {
				return '';
			} else if (!string) {
				return string + '';
			}

			// Force a string conversion as this will be done by the append regardless and
			// the regex test will do this transparently behind the scenes, causing issues if
			// an object's to string has escaped characters in it.
			string = '' + string;

			if (!possible.test(string)) {
				return string;
			}
			return string.replace(badChars, escapeChar);
		};
	})();

module.exports = {
	jsonp: function(url, params, callback, context, jsonpParam) {
		var callbackId = '_l_geocoder_' + (lastCallbackId++);
		params[jsonpParam || 'callback'] = callbackId;
		window[callbackId] = L.Util.bind(callback, context);
		var script = document.createElement('script');
		script.type = 'text/javascript';
		script.src = url + L.Util.getParamString(params);
		script.id = callbackId;
		document.getElementsByTagName('head')[0].appendChild(script);
	},

	getJSON: function(url, params, callback) {
		var xmlHttp = new XMLHttpRequest();
		xmlHttp.onreadystatechange = function () {
			if (xmlHttp.readyState !== 4){
				return;
			}
			if (xmlHttp.status !== 200 && xmlHttp.status !== 304){
				callback('');
				return;
			}
			callback(JSON.parse(xmlHttp.response));
		};
		xmlHttp.open('GET', url + L.Util.getParamString(params), true);
		xmlHttp.setRequestHeader('Accept', 'application/json');
		xmlHttp.send(null);
	},

	template: function (str, data) {
		return str.replace(/\{ *([\w_]+) *\}/g, function (str, key) {
			var value = data[key];
			if (value === undefined) {
				value = '';
			} else if (typeof value === 'function') {
				value = value(data);
			}
			return htmlEscape(value);
		});
	},

	htmlEscape: htmlEscape
};