滚动新闻的实现

  要实现滚动功能通常是用脚本代码编写而成的,很繁琐!这里给大家介绍用web控件实现其功能!实现这个功能的前提是要设计一个主从详细显示的数据库,为方便操作,我在系统给的NorthWind数据库中加入了两个表,这两个表结构很简单的!

表一

News Table

create table tbl_News

(

newsId int primary key identity(1,1) Not null,

newTitle varchar(50) Not null,

dateCreated datetime

)

 

表二

News Detail Table

create table tbl_NewsDetail

(

dtlId int primary key identity(1,1) Not Null,

newsId int foreign key references tbl_news,

newsDetail varchar(8000)

)

   完后,可以随意的输入些新闻的信息,要不然程序运行的时候,将看不到任何效果!
关于代码的详细说明:
      1、建立的控件"Scrolling_News.ascx"放在文件夹“userControll”中,这只是为了便于有效管理!在该控件中,我放置了一个table控件,相应的HTML源码如下:
<TABLE id="tblScrolling" cellSpacing="1" cellPadding="1" width="100%" border="0" runat="server">

<TR id="rowScrolling" runat="server"></TR>

</TABLE>
       这个控件主要是查找新闻主表,按照创建日期进行排序,给出当前新闻的宏观展示。相关代码如下:

   private void Page_Load(object sender, System.EventArgs e)

        {

           SqlConnection myCon = new SqlConnection(ConfigurationSettings.AppSettings["connectionString"]);

            string strSql = "SELECT * FROM tbl_News order by dateCreated asc";

            string strScrolling = "";

            HtmlTableCell cellScrolling = new HtmlTableCell();

            SqlCommand myComd = new SqlCommand(strSql, myCon);

            SqlDataReader sqlRdr;

            try

            {

                myCon.Open();

                sqlRdr = myComd.ExecuteReader();

                strScrolling = "<Marquee OnMouseOver='this.stop();' OnMouseOut='this.start();' direction='up' scrollamount='2' bgcolor='#000000' width='40%'>";

                while (sqlRdr.Read())

                {

                    strScrolling = strScrolling + "<a href='#' OnClick=" + "javascript:window.open('newsDetail.aspx?NewsId=" + sqlRdr.GetValue(0) + "','NewsDetail','width=400,height=400;toolbar=no;');" + "><font face='verdana' size='2' color='#ffffff'>" + sqlRdr.GetValue(1) + "</a>&nbsp;&nbsp;" + sqlRdr.GetValue(2).ToString() + "</font><br><br>";

                }

                strScrolling = strScrolling + "</Marquee>";

                sqlRdr.Close();

                cellScrolling.InnerHtml = strScrolling;

                rowScrolling.Cells.Add(cellScrolling);

            }

            catch (Exception msg)

            {

                Response.Write(msg.Message);

            }

            finally

            { 

                myCon.Close();

            }

        } 

 

 

  2、在newsdetails.aspx中,其根据传递过来的新闻标号进行处理,读取对应的新闻详细信息,并将其内容添加到newsdetails.aspx页面中显示出来,该页面的大小等信息已经限定,表面上看来好象是以个弹出窗口的形式显示!详细的代码如下:
private void Page_Load(object sender, System.EventArgs e)

        {

         

            SqlConnection myCon = new SqlConnection(ConfigurationSettings.AppSettings["connectionString"]);

            string strSql = "SELECT newsDetail FROM tbl_NewsDetail WHERE newsId=" + Convert.ToInt32(Request.QueryString["NewsId"]);

            HtmlTableCell cellNewsDetail = new HtmlTableCell();

            SqlCommand myComd = new SqlCommand(strSql, myCon);

            SqlDataReader sqlRdr;

            try

            {

                myCon.Open();

                sqlRdr = myComd.ExecuteReader();

                if (sqlRdr.Read())

                {

                   cellNewsDetail.InnerText = sqlRdr.GetValue(0).ToString();

                    rowNewsDetail.Cells.Add(cellNewsDetail);

                }

                else

                {

                    Response.Write("No Record found in the detail table");

                }

                sqlRdr.Close();

            }

            catch (Exception msg)

            {

                Response.Write(msg.Message);

            }

            finally

            {

                myCon.Close();

            }

        }

 

    到这一步就实现了滚动功能

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