/// <summary>
///
/// </summary>
/// <param name="html"></param>
/// <param name="option"></param>
/// <param name="builder"></param>
private static void CreatePageLink(HtmlHelper html,
PagingOptions option, StringBuilder builder)
{
var routeDict = GetRouteValueDictionary(html);
routeDict.Remove(option.PageSegmentName);
IDictionary<string, object> pageLinkHtmlAttributes =
AnonymousTypeTools.GetDictionary(option.PageLinkHtmlAttributes);
IDictionary<string, object> currentPageLinkHtmlAttributes =
(option.CurrentPageLinkHtmlAttributes == null ? pageLinkHtmlAttributes :
AnonymousTypeTools.GetDictionary(option.CurrentPageLinkHtmlAttributes));
IDictionary<string, object> firstLastLinkHtmlAttributes =
(option.FirstLastLinkHtmlAttributes == null ? pageLinkHtmlAttributes :
AnonymousTypeTools.GetDictionary(option.FirstLastLinkHtmlAttributes));
if (option.IncludeQueryStringForPage1)
routeDict[option.PageSegmentName] = 1;
builder.Append(html.RouteLink(option.FirstButtonTitle,
routeDict, firstLastLinkHtmlAttributes));
int count = option.MaxPageDisplay / 2;
int prePage = Math.Max(option.CurrentPage - count, 1);
count = option.MaxPageDisplay - 1 - option.CurrentPage + prePage;
int lastPage = Math.Min(option.CurrentPage + count, option.TotalPage);
count = count - lastPage + option.CurrentPage;
prePage = Math.Max(prePage - count, 1);
IDictionary<string, object> htmlDict;
for (int page = prePage; page <= lastPage; page++)
{
if (page == option.CurrentPage)
htmlDict = currentPageLinkHtmlAttributes;
else htmlDict = pageLinkHtmlAttributes;
if (page > 1)
routeDict[option.PageSegmentName] = page;
builder.Append(html.RouteLink(page.ToString(),
routeDict, htmlDict));
}
if (option.TotalPage > 1)
routeDict[option.PageSegmentName] = option.TotalPage;
builder.Append(html.RouteLink(option.LastButtonTitle,
routeDict, firstLastLinkHtmlAttributes));
}
/// <summary>
/// Tạo ra mã Html cho bộ phân trang với thông tin cấu hình cho
/// bởi info
/// </summary>
public static MvcHtmlString Paging(this HtmlHelper html, PagingOptions option)
{
InitPagingOptions(html, option);
StringBuilder builder = new StringBuilder();
if (option.CreateWrapDiv)
{
builder.Append("<div ")
.Append(html.HtmlAttributes(option.DivHtmlAttributes))
.Append(">");
}
if (option.AllowGoToPage)
{
UrlHelper urlHelper = new UrlHelper(html.ViewContext.RequestContext);
builder.Append("<form method='get' action='")
.Append(urlHelper.Action((string)null, (string)null))
.Append("'>");
}
CreatePageLink(html, option, builder);
if (option.AllowGoToPage)
{
builder.Append("<input type='text' name='")
.Append(option.PageSegmentName)
.Append("' value='")
.Append(option.CurrentPage)
.Append("' ")
.Append(html.HtmlAttributes(option.TextBoxHtmlAttributes))
.Append(">");
builder.Append("<input type='submit' value='")
.Append(option.GoButtonTitle)
.Append("' ")
.Append(html.HtmlAttributes(option.GoButtonHtmlAttributes))
.Append(">");
KeepQueryStringAlive(builder, html, option);
builder.Append("<form>");
}
if (option.CreateWrapDiv)
{
builder.Append("</div>");
}
return new MvcHtmlString(builder.ToString());
}
private static void KeepQueryStringAlive(StringBuilder builder,
HtmlHelper html, PagingOptions option)
{
var queryString = html.ViewContext.HttpContext.Request.QueryString;
foreach (string key in queryString.AllKeys)
{
if (!string.Equals(key, option.PageSegmentName, StringComparison.CurrentCultureIgnoreCase))
builder.Append(html.Hidden(key, queryString[key], new { id = (string)null }));
}
}
/// <summary>
/// thực hiện 1 số xử lý ban đầu để chỉnh lại những thông tin trong
/// PagingOptions cho đúng, ví dụ như tính lại TotalPage, CurentPage
/// , hay là đọc CurentPage từ QueryString
/// </summary>
/// <param name="option"></param>
private static void InitPagingOptions(HtmlHelper html, PagingOptions option)
{
if (option.IsNotSetCurrentPage())
{
var request = html.ViewContext.HttpContext.Request;
string str = request.QueryString[option.PageSegmentName];
option.CurrentPage = 1;
int currentPage;
if (int.TryParse(str, out currentPage))
option.CurrentPage = currentPage;
}
option.RecaculatePagingInfo();
}
