Property Finder - a Cross-Platform HTML5 Mobile App

/// <reference path="..//intellisense.js" />

/*global $, Model */

Model.JSONDataSource = function () {
  /// <summary>
  /// A service that allows property searches, returning the results in JSON format. This service
  /// uses the Nestoria APIs.
  /// </summary>

  // ----- private functions

  function ajaxRequest(uri, params, callback, errorCallback) {
    /// <summary>
    /// Performs a JSON request via the jQuery-JSONP library
    /// http://code.google.com/p/jquery-jsonp/
    /// </summary>
    $.jsonp({
      dataType: "jsonp",
      data: params,
      url: uri,
      timeout: 5000,
      success: function (result) {
        callback(result);
      },
      error: function (jqXHR, textStatus, errorThrown) {
        errorCallback("datasource error [" + textStatus + "] [" + errorThrown + "]");
      }
    });
  }

  // ----- public functions

  this.findProperties = function (location, pageNumber, callback, errorCallback) {
    /// <summary>
    /// Finds properties based on a location string
    /// </summary>
    var query = "http://api.nestoria.co.uk/api",
        params = {
          country: "uk",
          pretty: "1",
          action: "search_listings",
          encoding: "json",
          listing_type: "buy",
          page: pageNumber,
          place_name: location,
          callback: "_jqjsp"
        };

    ajaxRequest(query, params, callback, errorCallback);
  };

  this.findPropertiesByCoordinate = function (latitude, longitude, pageNumber, callback, errorCallback) {
    /// <summary>
    /// Finds properties based on lat / long values
    /// </summary>
    var query = "http://api.nestoria.co.uk/api",
        params = {
          country: "uk",
          pretty: "1",
          action: "search_listings",
          encoding: "json",
          listing_type: "buy",
          page: pageNumber,
          centre_point: latitude + "," + longitude,
          callback: "_jqjsp"
        };

    ajaxRequest(query, params, callback, errorCallback);
  };
};