/// <summary>
/// 生成分页链接Url
/// </summary>
/// <param name="htmlHelper">HtmlHelper</param>
/// <param name="page">页码</param>
/// <param name="options">配置</param>
/// <returns></returns>
internal static string GeneratePaginationUrl(this HtmlHelper htmlHelper, long page, BootstrapPagedButtonOptions options)
{
if (!htmlHelper.ViewContext.IsChildAction && htmlHelper.ViewContext.RouteData.Values.TryGetValue("page", out object pageIndexObj))
{
htmlHelper.ViewContext.RouteData.Values["page"] = page;
return(UrlHelper.GenerateUrl(options.RouteName, options.ActionName, options.ControllerName, htmlHelper.ViewContext.RouteData.Values, RouteTable.Routes, htmlHelper.ViewContext.RequestContext, false));
}
var currentUrl = htmlHelper.ViewContext.RequestContext.HttpContext.Server.HtmlEncode(htmlHelper.ViewContext.HttpContext.Request.RawUrl);
if (currentUrl.IndexOf("?") == -1)
{
return(string.Format("{0}?page={1}", currentUrl, page));
}
if (currentUrl.IndexOf("page=", StringComparison.InvariantCultureIgnoreCase) == -1)
{
return(string.Format("{0}&page={1}", currentUrl, page));
}
return(Regex.Replace(currentUrl, @"page=(\d+\.?\d*|\.\d+)", $"page={page}", RegexOptions.IgnoreCase | RegexOptions.Compiled));
}
internal static void GeneratePageButton(this HtmlHelper htmlHelper,
TagBuilder pageBuilder,
bool canClick, long page, string text, BootstrapPagedButtonOptions options, bool current = false)
{
TagBuilder liTag = new TagBuilder("li");
if (canClick)
{
if (current)
{
liTag.AddCssClass("active");
}
else
{
liTag.AddCssClass("disabled");
}
liTag.InnerHtml += $"<a href='javascript:;'>{text}</a>";
}
else
{
liTag.InnerHtml += string.Format("<a href='{0}'>{1}</a>", htmlHelper.GeneratePaginationUrl(page, options), text);
}
pageBuilder.InnerHtml += liTag.ToString();
}
/// <summary>
/// 输出符合 bootstrap 风格的分页 HTML 一系列相关元素。
/// </summary>
/// <param name="htmlHelper"></param>
/// <param name="pagedEntity"><see cref="IPagedCollection{TEntity}"/> 可分页的对象。</param>
/// <param name="options">分页的配置对象。</param>
/// <returns></returns>
public static MvcHtmlString BootstrapPageButton <TEntity>(this HtmlHelper htmlHelper, IPagedCollection <TEntity> pagedEntity, BootstrapPagedButtonOptions options = null)
{
if (options == null)
{
options = new BootstrapPagedButtonOptions();
}
if (pagedEntity.Count == 0 || pagedEntity.ItemsPerPage == 0)
{
return(MvcHtmlString.Empty);
}
pagedEntity.ComputePages();
var totalPages = pagedEntity.TotalPages;
if ((pagedEntity.Count % pagedEntity.ItemsPerPage) > 0)
{
totalPages++;
}
//未超过一页时不显示分页按钮
if (!options.AlwaysShow && totalPages <= 1)
{
return(MvcHtmlString.Empty);
}
var pageIndex = pagedEntity.CurrentPage;
bool showNumberic = false;
bool showFirst = false;
bool showLast = false;
bool showPrevious = false;
bool showNext = false;
var mode = options.ButtonMode;
if (mode == PageButtonMode.FirstLastNumberic || mode == PageButtonMode.PreviousNextFirstLastNumberic || mode == PageButtonMode.PreviousNextNumberic || mode == PageButtonMode.OnlyNumberic)
{
showNumberic = true;
}
if (mode == PageButtonMode.FirstLastNumberic || mode == PageButtonMode.PreviousNextFirstLast || mode == PageButtonMode.PreviousNextFirstLastNumberic)
{
showFirst = true;
showLast = true;
}
if (mode == PageButtonMode.PreviousNext || mode == PageButtonMode.PreviousNextFirstLast || mode == PageButtonMode.PreviousNextFirstLastNumberic || mode == PageButtonMode.PreviousNextNumberic)
{
showPrevious = true;
showNext = true;
}
string firstText = options.TextOfFirst;
string previouseText = options.TextOfPrevious;
string nextText = options.TextOfNext;
string lastText = options.TextOfLast;
//分页字符串
TagBuilder pageBuilder = new TagBuilder("ul");
pageBuilder.AddCssClass("pagination");
switch (options.Size)
{
case SizeTypes.SM:
pageBuilder.AddCssClass(" pagination-sm ");
break;
case SizeTypes.LG:
pageBuilder.AddCssClass(" pagination-lg ");
break;
default:
break;
}
pageBuilder.MergeAttributes(HtmlHelper.AnonymousObjectToHtmlAttributes(options.HtmlAttributes));
if (showFirst)
{
htmlHelper.GeneratePageButton(pageBuilder, pageIndex <= 1, 1, firstText, options);
}
if (showPrevious)
{
htmlHelper.GeneratePageButton(pageBuilder, pageIndex - 1 < 1, pageIndex - 1, previouseText, options);
}
#region 计算页数
if (showNumberic)
{
long startPage = 1;
long endPage = 1;
int numbericCount = options.NumbericCount;
if (totalPages > numbericCount)
{
if (pageIndex - (numbericCount / 2) > 0)
{
if (pageIndex + (numbericCount / 2) < totalPages)
{
startPage = pageIndex - (numbericCount / 2);
endPage = startPage + numbericCount - 1;
}
else
{
endPage = totalPages;
startPage = endPage - numbericCount + 1;
}
}
else
{
endPage = numbericCount;
}
}
else
{
startPage = 1;
endPage = totalPages;
}
for (var i = startPage; i <= endPage; i++)
{
htmlHelper.GeneratePageButton(pageBuilder, i == pagedEntity.CurrentPage, i, i.ToString(), options, i == pagedEntity.CurrentPage);
}
}
#endregion
if (showNext)
{
htmlHelper.GeneratePageButton(pageBuilder, pageIndex + 1 > totalPages, pageIndex + 1, nextText, options);
}
if (showLast)
{
htmlHelper.GeneratePageButton(pageBuilder, pageIndex >= totalPages, totalPages, lastText, options);
}
return(MvcHtmlString.Create(pageBuilder.ToString()));
}
