下面图老师小编要向大家介绍下Ajax实现在textbox中输入内容动态从数据库中模糊查询显示到下,看起来复杂实则是简单的,掌握好技巧就OK,喜欢就赶紧收藏起来吧!
【 tulaoshi.com - Web开发 】
功能:在textbox中输入内容,动态从数据库模糊查询显示到下拉框中,以供选择
1.建立一aspx页面,html代码
  HTML
      HEAD
          titleWebForm1/title
          SCRIPT language="javascript"            
              //城市------------------------------
              function cityResult() 
              { 
                  var city=document.getElementById("TextBox1");
                  WebForm1.GetCityList(city.value,get_city_Result_CallBack);
              }
              
              function get_city_Result_CallBack(response)
              {
                  if (response.value != null)
                  {                    
                      //debugger;
                      document.getElementById("DropDownList1").style.display="block";
                      document.getElementById("DropDownList1").length=0;              
                var ds = response.value;
                      if(ds != null && typeof(ds) == "object" && ds.Tables != null)
                      {                    
                          for(var i=0; ids.Tables[0].Rows.length; i++)
                    {
                        var name=ds.Tables[0].Rows[i].city;
                    var id=ds.Tables[0].Rows[i].cityID;
                    document.getElementById("DropDownList1").options.add(new Option(name,id));
                    }
                      }
                  }
                  else
                  {
                      document.getElementById("DropDownList1").style.display="none";
                  }             
                  return
              }
             
              function getData()
              {
                  var province=document.getElementById("DropDownList1");
                  var pindex = province.selectedIndex;
                  var pValue = province.options[pindex].value;
                  var pText  = province.options[pindex].text;                                                
                  document.getElementById("%=TextBox1.ClientID%").innerText=pText;
              }
          /SCRIPT
      /HEAD
      body
          form id="Form1" method="post" runat="server"
              asp:TextBox ID="TextBox1" runat="server"/asp:TextBox
              br
              asp:DropDownList ID="DropDownList1" runat="server" Width="192px" style="display:none"/asp:DropDownList
          /form
      /body
  /HTML2.cs代码
  using System;
  using System.Collections;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Web;
  using System.Web.SessionState;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  using System.Web.UI.HtmlControls;
  using System.Data.SqlClient;
  namespace ajaxselect
  {
      /**//// summary
      /// Summary description for WebForm1.
      /// /summary
      public class WebForm1 : System.Web.UI.Page
      {
          protected System.Web.UI.WebControls.TextBox TextBox1;
          protected System.Web.UI.WebControls.DropDownList DropDownList1;
      
          private void Page_Load(object sender, System.EventArgs e)
          {
              Ajax.Utility.RegisterTypeForAjax(typeof(WebForm1));
              if (!Page.IsPostBack)
              {
                  this.TextBox1.Attributes.Add("onchange", "cityResult();");
                  this.DropDownList1.Attributes.Add("onclick", "getData();");
              }
          }
          Web Form Designer generated code#region Web Form Designer generated code
          override protected void OnInit(EventArgs e)
          {
              //
              // CODEGEN: This call is required by the ASP.NET Web Form Designer.
              //
              InitializeComponent();
              base.OnInit(e);
          }
          
          /**//// summary
          /// Required method for Designer support - do not modify
          /// the contents of this method with the code editor.
          /// /summary
          private void InitializeComponent()
          {    
              this.Load += new System.EventHandler(this.Page_Load);
          }
          #endregion
          GetCityList#region GetCityList
          [Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]
          public DataSet GetCityList(int provinceid)
          {
              string sql = "select * from city where father like '%" + provinceid + "%'";
              return GetDataSet(sql);
          }
          #endregion
          GetDataSet#region GetDataSet
          public static DataSet GetDataSet(string sql)
          {
              string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
              SqlDataAdapter sda = new SqlDataAdapter(sql, ConnectionString);
              DataSet ds = new DataSet();
              sda.Fill(ds);
              return ds;
          }
          #endregion
      }
  }3.源代码下载   
  4.数据库脚本
  CREATE TABLE [dbo].[city](
      [id] [int] NOT NULL,
      [cityID] [nvarchar](6) COLLATE Chinese_PRC_CI_AS NULL,
      [city] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NULL,
      [father] [nvarchar](6) COLLATE Chinese_PRC_CI_AS NULL,
   CONSTRAINT [PK_city] PRIMARY KEY CLUSTERED 
  (
      [id] ASC
  )WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
  ) ON [PRIMARY]
来源:http://www.tulaoshi.com/n/20160219/1628352.html
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