Created
December 8, 2016 20:33
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getParameterByNameUsingDefaultValue.js
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| /** | |
| * @copyright 2015 Apple Inc. All rights reserved. | |
| * @author supermario@apple.com | |
| */ | |
| 'use strict'; | |
| var cachedValues = {}; | |
| /** | |
| * Returns URL parameter if available, if not returns `defaultValue` | |
| * @param {String} name Name of URL parameter to look for | |
| * @param {*} defaultValue Default value used if `name` is not found | |
| * @param {Boolean=false} preventCaching If true value is never cached, useful for non onetime use parameters | |
| * @return {*} | |
| */ | |
| module.exports = function getParameterByNameUsingDefaultValue(name, defaultValue, preventCaching) { | |
| name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]"); | |
| if(preventCaching || !cachedValues.hasOwnProperty(name)) { | |
| var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"); | |
| var results = regex.exec(location.search); | |
| var value = (results === null) ? defaultValue : decodeURIComponent(results[1].replace(/\+/g, " ")); | |
| // naive but good enough string to bool conversion | |
| if(value === "true" || value === "false") value = (value === "true"); | |
| // naive but good enough string to number conversion | |
| if( !isNaN( parseFloat(value) ) ) value = parseFloat(value); | |
| cachedValues[name] = value; | |
| } | |
| return cachedValues[name]; | |
| }; |
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