public JsonResult GetScrollSearchResults(Search search, string scrollDirection)
{
if (!ModelState.IsValid || !new[] {"scrollup", "scrolldown"}.Contains(scrollDirection.ToLower()))
throw new Exception(
"Model dla 'search' lub Kierunek sortowania przekazany przez Ajax jest nieprawidłowy");
var sessSearch = new Search((Dictionary<string, object>) Session["SearchParams"]);
var expectedSearch = new Search(search) {HowMuchSkip = sessSearch.HowMuchSkip};
if (Session["SearchParams"] == null || !sessSearch.Equals(expectedSearch))
{
//throw new Exception("Sesja jest pusta lub nieprawidłowa"); // fallback
return Json(new
{
ResultsCount = -2, // Sesja jest pusta lub nieprawidłowa
PartialView = string.Empty
}, JsonRequestBehavior.AllowGet);
}
var totalSkip = search.HowMuchSkip + sessSearch.HowMuchSkip;
search.HowMuchSkip = totalSkip;
var searchWithoutInvertedValues = new Search(search);
switch (scrollDirection.ToLower())
{
case "scrolldown":
totalSkip = search.HowMuchSkip + search.HowMuchTake - 2;
search.HowMuchSkip = totalSkip;
break;
case "scrollup":
totalSkip = search.HowMuchSkip; // dummy, do usunięcia
search.HowMuchSkip = totalSkip;
break;
default:
throw new Exception("Niepoprawny kierunek przewijania. ");
}
search.HowMuchTake = 2;
bool error;
string resultsCounter;
var books = GetBooks(search, out resultsCounter, out error);
if (books.Count <= 0)
return Json(new
{
ResultsCount = error ? -1 : books.Count,
ResultsCounter = resultsCounter,
PartialView = string.Empty
}, JsonRequestBehavior.AllowGet);
SaveSearchParamsSession(searchWithoutInvertedValues.ToDictionary());
// parsować do liczb if scrolldown dodac z dolu scrollup z gory
resultsCounter = resultsCounter.Trim().Replace(" ", string.Empty);
// obsługuję resultsCounter tylko jeżeli są wyniki
var parsedFrom = Convert.ToInt32(resultsCounter.Substring(0, resultsCounter.IndexOf('-')));
if (scrollDirection.ToLower() == "scrolldown")
parsedFrom -= 10;
var parsedTo =
Convert.ToInt32(resultsCounter.Substring(resultsCounter.LastIndexOf('-') + 1,
resultsCounter.IndexOf('z') - resultsCounter.LastIndexOf('-') - 1));
if (scrollDirection.ToLower() == "scrollup")
parsedTo += 10;
var parsedTotal =
Convert.ToInt32(resultsCounter.Substring(resultsCounter.LastIndexOf('z') + 1,
resultsCounter.LastIndexOf('(') - resultsCounter.LastIndexOf('z') - 1));
var parsedCount =
Convert.ToInt32(resultsCounter.Substring(resultsCounter.LastIndexOf('(') + 1,
resultsCounter.LastIndexOf(')') - resultsCounter.LastIndexOf('(') - 1)) + 10;
//if (parsedCount < parsedTo - parsedFrom) // obsłużone w bazie danych
// parsedTo = parsedFrom + parsedCount;
resultsCounter = parsedFrom + " - " + parsedTo + " z " + parsedTotal + " (" + parsedCount + ")";
return Json(new
{
ResultsCount = books.Count,
ResultsCounter = resultsCounter,
PartialView = RenderPartialView("_SearchResults", books)
}, JsonRequestBehavior.AllowGet);
}
