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N个ASP.net DropDownList 无刷新联动菜单


发布日期:2022年06月02日
 
N个ASP.net DropDownList 无刷新联动菜单

再谈 N 个  DropDownList 无刷新联动菜单牺牲N个ASPX来实现自动更新机制避免刷新的闪动!!

以下代码绝对可以使用也可以实现多级菜单

============================

webform1.aspx

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

{

// 在此处放置用户代码以初始化页面

if(!IsPostBack)

{

SqlConnection con = new SqlConnection("packet size=4096;user id=sa;data source=SERVER;persist security info=False;initial catalog=pubs");

SqlDataAdapter da = new SqlDataAdapter("select state from authors group by state",con);

DataSet ds = new DataSet("State");

da.Fill(ds);

this.DropDownList1.DataSource = ds.Tables[0];

this.DropDownList1.DataTextField = "state";

this.DropDownList1.DataValueField = "state";

this.DropDownList1.DataBind();

this.DropDownList1.Attributes.Add("onchange","load()");

//DropDownList1.

}

}

webform2.aspx

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

{

// 在此处放置用户代码以初始化页面

if(this.Request["state"]!=null)

{

string state = this.Request["state"].ToString();

SqlConnection con = new SqlConnection("packet size=4096;user id=sa;data source=SERVER;persist security info=False;initial catalog=pubs");

SqlDataAdapter da = new SqlDataAdapter("select address from authors where state = '"+state+"'",con);

DataSet ds = new DataSet("address");

da.Fill(ds);

XmlTextWriter writer = new XmlTextWriter(Response.OutputStream, Response.ContentEncoding);

writer.Formatting = Formatting.Indented;

writer.Indentation = 4;

writer.IndentChar = ' ';

ds.WriteXml(writer);

writer.Flush();

Response.End();

writer.Close();

}

}

               

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