protected void ChangeItemsPerPageAndBind(object sender, EventArgs e)
{
_hasPageUnitChanged = true; //This fired so it must have changed.
// clear the keyword search field
txtSWRKeyword.Text = "";
//Get the last total number of results so if the user changes the ItemsPerPage(pageunit)
//then we can move them to the closest page. Say you are viewing 10 items per page and
//you are on page 6. This shows 51-60. If you change to 50 items per page you should put
//the user on page 2 and not page 1. That way they will see 51-100.
//So we should know the current page number, it was part of the postback.
//we do have to know what the old page unit was, that will give us the first record.
int firstItem, lastItem;
SimpleUlPager.GetFirstItemLastItem(CurrentPage, PreviousItemsPerPage, (int)TotalNumberOfResults, out firstItem, out lastItem);
//Set the current page.
CurrentPage = firstItem / ItemsPerPage + (firstItem % ItemsPerPage > 0 ? 1 : 0);
//If the CurrentPage is 0, then Endeca will throw errors, so we need to set a curretnpage ==0
//to 1. This brings up a very good point, why do we show the change number of items per page
//if we have 0 results. One might also ask, why do we go to Endeca to bind the results when we
//know they will not change? The answer is partially due to lazyness and making the code simple.
//LoadResults not only loads the results, but also makes sure that things like total results and
//previousitemsperpage are set. I would rather just call this and not add yet another code
//branch to this already complicated code.
if (CurrentPage == 0)
{
CurrentPage = 1;
}
//Note LoadResults gets the page unit on its own.
LoadResults();
}
/// <summary>
/// This method is the one that sets up label text and binds the search results.
/// </summary>
private void LoadResults()
{
//Get Bestbets. Only show if we are on page one and we are not doing a search within
//the results.
if (CurrentPage == 1 && OldKeywords.Count == 0)
{
BestBetUIResult[] bbResults = GetBestBetsResults(SearchTerm);
if (bbResults.Length > 0)
{
isBestBet = true;
rptBestBets.DataSource = bbResults;
rptBestBets.DataBind();
rptBestBets.Visible = true;
}
else
{
rptBestBets.Visible = false;
}
}
else
{
rptBestBets.Visible = false;
}
//Get Results...
ISiteWideSearchResultCollection results = null;
try
{
results = NCI.Search.SiteWideSearch.GetSearchResults(SearchCollection, SearchTerm, ItemsPerPage,
(CurrentPage - 1) * ItemsPerPage);
}
catch (Exception e)
{
//capture exactly which keyword caused the error
log.ErrorFormat("Search with the following keyword returned an error: {0}", e, KeywordText);
}
//Set the last total number of results so if the user changes the ItemsPerPage(pageunit)
//then we can move them to the closest page. Say you are viewing 10 items per page and
//you are on page 6. This shows 51-60. If you change to 50 items per page you should put
//the user on page 2 and not page 1. That way they will see 51-100.
TotalNumberOfResults = results.ResultCount;
PreviousItemsPerPage = ItemsPerPage;
int firstIndex, lastIndex;
//Get first index and last index
SimpleUlPager.GetFirstItemLastItem(CurrentPage, ItemsPerPage, (int)results.ResultCount, out firstIndex, out lastIndex);
_resultOffset = firstIndex;
if (results != null && results.ResultCount > 0)
{
//the title text that needs to be removed from the search result Title
string removeTitleText = ContentDeliveryEngineConfig.PageTitle.AppendPageTitle.Title;
rptResults.DataSource = from res in results
select new NCI.Web.UI.WebControls.TemplatedDataItem(
GetSearchResultTemplate((ISiteWideSearchResult)res),
new
{
URL = res.Url,
Title = (!string.IsNullOrEmpty(removeTitleText) && res.Title.Contains(removeTitleText)) ? res.Title.Remove(res.Title.IndexOf(removeTitleText)) : res.Title,
DisplayUrl = res.Url,
Description = res.Description,
Label = GetSearchResultLabel((ISiteWideSearchResult)res),
});
rptResults.DataBind();
}
//Set Keywords in labels
lblResultsForKeyword.Text = KeywordText;
lblTopResultsXofYKeyword.Text = KeywordText;
lblSearchWithinResultKeyword.Text = KeywordText;
//Show labels for results X of Y
ShowResultsXoYLabels(firstIndex, lastIndex, results.ResultCount);
//Setup pager
SetupPager();
//Set the Search Within Results Radio button to new search
rblSWRSearchType.SelectedIndex = 0;
//// Web Analytics *************************************************
// Add number of search results to analytics
this.PageInstruction.SetWebAnalytics(WebAnalyticsOptions.eVars.evar10, wbField =>
{
wbField.Value = TotalNumberOfResults.ToString();
});
this.PageInstruction.AddFieldFilter("channelName", (name, data) =>
{
data.Value = "NCI Home";
});
// Add Best Bets event to analytics
if (rptBestBets.Visible)
{
this.PageInstruction.SetWebAnalytics(WebAnalyticsOptions.Events.event10, wbField =>
{
wbField.Value = WebAnalyticsOptions.Events.event10.ToString();
});
}
//// End Web Analytics *************************************************
}