/// <summary>
/// gets courses by page
/// </summary>
/// <param name="parentItem">If its first page, parent item should be passed. All its child pages will be verified.</param>
/// <param name="pageNumber">1 is for first page, 2 is for next page & 0 is for previous page</param>
/// <param name="referenceCourseItemID">the course item id of the first or last course teaser on page</param>
/// <returns></returns>
private List <CourseDetails> GetCoursesByPage(string coursesRootItemID, string pageNumber, string referenceCourseItemIDs, out bool showPrevButton, out bool showNextButton)
{
showPrevButton = false;
showNextButton = false;
List <CourseDetails> lstCourses = new List <CourseDetails>();
List <Item> featuredItems = new List <Item>();
int maxTeasersPerPage = Constants.MaxCourseTeasersPerPage;
int itemsInList = 0;
if (pageNumber == "1" && !string.IsNullOrEmpty(coursesRootItemID))
{
Item coursesRootItem = SitecoreUtility.GetItem(new ID(coursesRootItemID));
//get the list of courses for first page
featuredItems = coursesRootItem != null?SitecoreUtility.GetItemsByTemplate(coursesRootItem, References.Templates.CourseDetailsPage.ID) : null;
if (featuredItems != null && featuredItems.Count > 0)
{
foreach (Item featuredItem in featuredItems)
{
if (itemsInList < maxTeasersPerPage)
{
CourseDetails courseDetailsItem = new CourseDetails(featuredItem);
if (courseDetailsItem != null && courseDetailsItem.IsActive)
{
courseDetailsItem.Instructor = GetInstructor(courseDetailsItem.SelectedInstructorItemID);
lstCourses.Add(courseDetailsItem);
itemsInList++;
}
}
}
}
}
else if (!string.IsNullOrEmpty(referenceCourseItemIDs))
{
string[] arrItemIDs = referenceCourseItemIDs.Split(',');
if (arrItemIDs != null && arrItemIDs.Length > 0)
{
Item referenceCourseItemFirst = !string.IsNullOrEmpty(arrItemIDs[0]) ? SitecoreUtility.GetItem(new ID(arrItemIDs[0])) : null;
Item referenceCourseItemLast = arrItemIDs.Length > 1 && !string.IsNullOrEmpty(arrItemIDs[1]) ? SitecoreUtility.GetItem(new ID(arrItemIDs[1])) : null;
Item siblingCourseItem = null;
while (itemsInList < maxTeasersPerPage)
{
if (pageNumber == "0")
{
//get previous page items
siblingCourseItem = referenceCourseItemFirst != null?SitecoreUtility.GetPreceedingSiblingItemByTemplate(referenceCourseItemFirst, References.Templates.CourseDetailsPage.ID, References.Templates.CourseDetails.Fields.IsActive) : null;
}
else if (pageNumber == "2")
{
//get next page items
siblingCourseItem = referenceCourseItemLast != null?SitecoreUtility.GetSucceedingSiblingItemByTemplate(referenceCourseItemLast, References.Templates.CourseDetailsPage.ID, References.Templates.CourseDetails.Fields.IsActive) : null;
}
if (siblingCourseItem != null)
{
referenceCourseItemFirst = siblingCourseItem;
referenceCourseItemLast = siblingCourseItem;
CourseDetails courseDetailsItem = new CourseDetails(siblingCourseItem);
if (courseDetailsItem != null && courseDetailsItem.IsActive)
{
courseDetailsItem.Instructor = GetInstructor(courseDetailsItem.SelectedInstructorItemID);
lstCourses.Add(courseDetailsItem);
itemsInList++;
}
}
else
{
break;
}
}
}
}
if (lstCourses != null && lstCourses.Count > 0)
{
//If the 'Previous' button was clicked, then the sibling items are added with the first item in page as reference.
//so this list should be reversed ideally.
if (lstCourses.Count > 1 && pageNumber == "0")
{
lstCourses.Reverse();
}
showPrevButton = SitecoreUtility.GetPreceedingSiblingItemByTemplate(lstCourses.FirstOrDefault().InnerItem, References.Templates.CourseDetailsPage.ID, References.Templates.CourseDetails.Fields.IsActive) != null;
showNextButton = SitecoreUtility.GetSucceedingSiblingItemByTemplate(lstCourses.LastOrDefault().InnerItem, References.Templates.CourseDetailsPage.ID, References.Templates.CourseDetails.Fields.IsActive) != null;
}
return(lstCourses);
}