URIParameter.js : URI のGETパラメータをオブジェクトに展開します。

URIParameter.js

/**
 * URIParameter.js
 *
 * @version 1.0.2
 * @author think49
 */

var URIParameter = (function () {

  /**
   * decodeURIComponent ("+" -> " ")
   * @function
   * @param   {String} encodedURIComponent  encoded URI String.
   * @returns decoded URI string.
   * @type String
   */
  var _decodeURIComponent = function (encodedURIComponent) {
    return decodeURIComponent(encodedURIComponent.replace(/\+/g, '\u0020'))
  };


  /**
   * get URI Parameters.
   * @constructor
   * @param   {String} uriString  URI Strings
   * @returns "[object URIParameter]"
   * @type Object
   */
  function URIParameter (uriString) {
    var queryStrings, i, l, temp;

    if (!(this instanceof URIParameter)) {
      throw new Error(this + ' is not a object created by constructor');
    }

    uriString += '';

    if (/[\r\n]/.test(uriString)) {
      throw new Error('not well-formed URI');
    }

    queryStrings = uriString.replace(/#.*$|^[^?]*/g, '');

    if (queryStrings.charAt(0) !== '?') {
      throw new Error(uriString + ' doesn\'t include a query string');
    }

    this.queryStrings = queryStrings;
    this.parameters = {length: 0};

    queryStrings = queryStrings.slice(1).split(/[&;]/);

    for (i = 0, l = queryStrings.length; i < l; i++) {
      temp = queryStrings[i].match(/^([^=]+)=(.*)$/);
      if (temp) {
        this.addParameter(_decodeURIComponent(temp[1]), _decodeURIComponent(temp[2]));
      }
    }

    return this;
  }

  (function () {

  /**
   * add Parameter.
   * @function
   * @param   {String} name  parameter-name.
   * @param   {String} value parameter-value.
   * @returns parameter's length.
   * @type Number
   */
    this.addParameter = function (name, value) {
      var parameters, target;

      parameters = this.parameters;
      parameters[parameters.length] = {name: name, value: value};

      if (name !== 'length') {
        if (name in parameters) {
          target = parameters[name];

          if (typeof target === 'object' && 'length' in target) {
            target[target.length] = value;
          } else {
            target = [target, value];
          }

          parameters[name] = target;
        } else {
          parameters[name] = value;
        }
      }

      return ++parameters.length;
    };


  /**
   * remove Parameter.
   * @function
   * @param   {String} name  parameter-name.
   * @param   {String} value parameter-value.
   * @returns parameter's length.
   * @type Number
   */
    this.removeParameter = function (name) {
      var i, l, parametersLength, parameters, target;

      parameters = this.parameters;

      if (name in parameters) {
        target = parameters[name];
        l = typeof target === 'object' && 'length' in target ? target.length : 1;
        delete parameters[name];

        for (i = 0, parametersLength = parameters.length; i < parametersLength || l > 0; i++) {
          if (parameters[i].name === name) {
            delete parameters[i];
            parameters.length--;
            l--;
          }
        }
      }

      return parameters.length;
    };

  }).call(URIParameter.prototype);

  return URIParameter;
})();

参考リンク。

• Javascriptで文字列から、任意の文字を抽出したい。 | OKWave
• 2010-10-01 - babu_babu_babooのごみ箱
• URLからパラメータを取得したいのですが、フラグメントがくっ付いてきます。 - Yahoo!知恵袋