使用jQuery導航Ajax

Question

我在ASP.NET頁面中有一個基本的<ul><li>結構。現在我在這個<li>中獲得了動態記錄，我的問題是，當用戶點擊下一個按鈕時，它應該檢查最後一頁，並相應地顯示一條警告消息，如果最後一頁已經達到。

我得到了jQuery中的totalPages，當我放置警報時，我得到了TotalPage的消息，但是當我在if條件下編寫相同的代碼時，它不評估。以下是我的JavaScript功能。

var totalPages = -1; 
function MostPopularSlideShows(currentPage, pager, mostpopular_data) { 
    $.ajax({ 
     type: "POST", 
     url: "SlideShowAdmin/Ajax/SlideShow.aspx/MostPopularSlideList", 
     dataType: "json", 
     contentType: "application/json", 
     data: "{\"CurrentPage\":'" + currentPage + "'}", 
     success: function (data) { 
      var result = data.d; 
      var totalPages = result[0].TotalPages; 
      //alert(totalPages); This works fine. 
      if (currentPage > totalPages) //Here it never evaluates 
      { 
       alert("You have reached last page"); 
       currentPage -= 1; 
      } 
      else { 
       $("#" + pager).html(currentPage + "/" + result[0].TotalPages); 
       $("#" + mostpopular_data).html(""); 
       $.each(result, function (index, item) { 
        $("#" + mostpopular_data).append("<li><img src=\"images/most_popr_pic1.jpg\" width=\"153\" height=\"90\" alt=\"\" class=\"floatleft\" /><h6>" + item.SlideShowName + "</h6><h3><a href=\"#\">" + item.Title + "</a></h3><h4>" + item.Description + "</h4></li>"); 
       }) 
      } 
     }, 
     error: function (data) { 
      alert("Cannot Get Most Popular SlideShow, Server Threw below error:\n" + data.responseText); 
     } 
    }); 
} 

以下是我的Ajax函數。

[WebMethod] 
public static SlideList[] MostPopularSlideList(int CurrentPage) 
{ 
    List<SlideList> list = new List<SlideList>(); 
    DataSet d = SqlHelper.ExecuteAdapterForDataSet("user_MostPopularSlideShow", new SqlParameter[] { new SqlParameter("@PortalID", PortalId), new SqlParameter("@CurrentPage", CurrentPage) }, CommandType.StoredProcedure); 
    foreach (DataRow r in d.Tables[0].Rows) 
    { 
     SlideList _slide = new SlideList(); 
     _slide.Id = Convert.ToInt32(r["Id"]); 
     _slide.SlideShowId = Convert.ToInt32(r["SlideShowId"]); 
     _slide.Description = r["SlideDescription"].ToString(); 
     _slide.CreatedDate = (r["CreatedDate"]).ToString(); 
     _slide.Thumbnail = r["Thumbnail"].ToString(); 
     _slide.Total = Convert.ToInt32(d.Tables[1].Rows[0]["TotalRows"]); 
     _slide.TotalPages = Convert.ToInt32(d.Tables[1].Rows[0]["TotalPages"]); 
     _slide.Title = r["SlideTitle"].ToString(); 
     _slide.SlideShowName = r["SlideShowName"].ToString(); 
     list.Add(_slide); 
    } 
    return list.ToArray(); 
} 

爲什麼它不評估totalPages？

Answer 1

實際上，我認爲下面的代碼塊從不執行。

if (currentPage > totalPages) //Here it never evaluates 
{ 
    alert("You have reached last page"); 
    currentPage -= 1; 
} 

由於current page最多隻能totalPages，它可以平等檢查，如：

if (currentPage == totalPages) //Here it never evaluates 
{ 
    alert("You have reached last page"); 
    currentPage -= 1; 
}