ajax實現google效果

來源:互聯網
上載者:User

    

     以前完ajax都是用控制項糊裡糊塗的用,也沒有看他的原理, ajax無重新整理,就是通過javascript 調用另一個頁面,然後在另一個頁面重新整理,然後擷取資料

原理就是這樣簡單,代碼更簡單,,

這個demo,原理很簡單,就是首先擷取 getHttpObject的物件模型,然後去post,WebForm1.aspx,然後還回結果,然後解析!
default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="AjaxWebApp._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>無標題頁</title>
    <script language="javascript">
        function getHttpObject()
        {
            var waystation = null;
            if(window.ActiveXObject)
            {
                waystation = new ActiveXObject("Microsoft.XMLHTTP");
            }
            else if(window.XMLHttpRequest)
            {
                waystation = new XMLHttpRequest();
            }
            else
            {
                waystation = false;
            }
            return waystation;
        }
       
        function addTest()
        {
            inputField = document.getElementById("textfield");
            completeTable = document.getElementById("table1");
            completeDiv = document.getElementById("popup");
            completeBody = document.getElementById("body1");
      
            var s = document.all.item("textfield").value;
           // alert(s);
            var aa= encodeURI(s);
            if(s=="")
            return;
            var xmlrequest =getHttpObject();
            xmlrequest.open("post","WebForm1.aspx?id="+aa);
            xmlrequest.onreadystatechange = function()
            {
                if(xmlrequest.readyState==4)
                {
                   //xmlrequest.responseText為你AddCity中輸出的那段字串;
                    setNames(xmlrequest.responseText);

                }
            }
            xmlrequest.send(null);
        }
       
        function setNames(names)
        {
            if(names=="")
            {
                clearNames();
                return ;
            }
            clearNames();
            setOffsets();
            var row,cell,txtNode;
           
            var s = names.split("$");
           
            for (var i = 0; i < s.length; i++)

               {

                 //s[i]為td的
                    var nextNode =s[i];
                    row = document.createElement("tr");
                    cell = document.createElement("td");
                    cell.onmouseout = function() {this.style.backgroundColor='';};
                    cell.onmouseover = function() {this.style.backgroundColor='#ffff00';};
                    cell.onclick = function() { completeField(this); } ;
                    cell.pop="T";
                    txtNode = document.createTextNode(nextNode);
                   cell.appendChild(txtNode);
                    row.appendChild(cell);
                    document.getElementById("body1").appendChild(row);
              }

        }
       
        //用來設定當滑鼠失去焦點後文字框的隱藏
        document.onmousedown=function()
        {
            if(!event.srcElement.pop)
             clearNames();
         }//填寫輸入框

        function completeField(cell)
        {
            inputField.value = cell.firstChild.nodeValue;
            clearNames();
        }
       
        function clearNames()
        {
            completeBody = document.getElementById("body1");
            var ind = completeBody.childNodes.length;
           
            for(var i= ind-1;i>=0;i--)
            {
                completeBody.removeChild(completeBody.childNodes[i]);
            }
            completeDiv= document.getElementById("popup");
            completeDiv.style.border = "none";
           
        }
       
        function setOffsets()
        {
            completeTable.style.width = inputField.offsetWidth;+"px";
            var left = calculateOffset(inputField,"offsetLeft");
            var top = calculateOffset(inputField,"offsetTop")+inputField.offsetHeight;
              completeDiv.style.border = "black 1px solid";
               completeDiv.style.left = left + "px";
               completeDiv.style.top = top + "px";
        }
       
        function calculateOffset(field, attr) {
    var offset = 0;
     while(field) {
     offset += field[attr];
     field = field.offsetParent;
    }
    return offset;
   }

   
    </script>
</head>
<body>
       <input name="textfield" id="textfield" type="text" class="input1" onkeyup="addTest();" maxlength="20" style="width: 68px" /><div  id="popup" style="POSITION: absolute">
       <table id="table1" cellspacing="0" cellpadding="0" bgcolor="#fffafa"  border="0" >
        <tbody id="body1"   >
        </tbody>
       </table>
      </div>

</body>

</html>
WebForm1.aspx 是用來後台重新整理的,所以
不需要前台頁面,可以把前台頁面的html去掉
:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="AjaxWebApp.WebForm1" %>

 

WebForm1.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

namespace AjaxWebApp
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

            string result = Request.QueryString["id"].ToString();
            //可以在這裡面進行資料庫的操作,然後把得到的結果作為字串返回過去,然後再去解析那段字串;主意看看這個頁面的HTML
            Response.Write("A$AA$AAA$AAAA");

           //測試demo所以比較簡單,重新整理在這個頁面,所以你可以在這個頁面做任何事情
        }
    }
}

 

 Demo不是最好,只是說明一些問題.../

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