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Javascript function to get a url parameter

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  1.   /**
  2.    * Returns url param value
  3.    * @author Arash Yalpani
  4.    *
  5.    * @param url The url to be queried
  6.    * @param paramName The params name
  7.    * @return paramName's value or false if param does not exist or is empty
  8.    *
  9.    * @example getUrlParam('http://localhost/?a=123', 'a') => 123
  10.    * @example getUrlParam('http://localhost/?a=123', 'b') => false
  11.    * @example getUrlParam('http://localhost/?a=',    'a') => false
  12.    */
  13.  
  14.   getUrlParam: function(url, paramName) {
  15.     var urlSplit = url.split('?');
  16.     if (!urlSplit[1]) { // no query
  17.       return false;
  18.     }
  19.  
  20.     var urlQuery = urlSplit[1];
  21.     var paramsSplit = urlSplit[1].split('&');
  22.     for (var i = 0; i < paramsSplit.length; i++) {
  23.       paramSplit = paramsSplit[i].split('=');
  24.       if (paramSplit[0] == paramName) {
  25.         return paramSplit[1] ? paramSplit[1] : false;
  26.       }
  27.     }
  28.  
  29.     return false;
  30.   }

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