minimalQueryParser.js

/**
 * Usage:
 * var q = new QueryParser();
 */
var QueryParser = function(option) {
  var config = option || {};
  var queriesMap = {};
  var queryString = config.queryString !== undefined ? config.queryString : location.search;
  return {
    /**
     * Get all the query params and their values
     */
    getAll: function() {
      var pairs = queryString.replace("?", "").split("&");
      var allQueries = this.parseToObject(pairs, "=");
      return allQueries;
    },
    
    /**
     * A helper to parse an array into an object
     */
    parseToObject: function(arrToParse) {
      arrToParse.forEach(function(pair, i) {
        var keyandval = pair.split("=");
        queriesMap[keyandval[0]] = keyandval[1];
      });

      return queriesMap;
    },
    
    /**
     A helper to parse an array into an object
      Usage:
        // For ueryString: "?foo=bar&baz=qux"
        var q = new QueryParser();
        q.getValueByParam("foo"); // returns "bar"
     */
    getValueByParam: function(paramName) {
      if (queriesMap[paramName] !== undefined) { return queriesMap[paramName]; }
      var rgx = new RegExp(paramName + "=(.+)&");
      return queryString.match(rgx)[1];
    }
  }
};