Ajax定義為“Asynchronous JavaScript + XML”的簡稱,也就是異步的JavaScript和XML處理。從原理上看,主要是Ajax可以通過調用HttpRequest實作與伺服器的異步通訊,并最終在網頁中實作豐富友好的使用者界面
Ajax使用初步,配置步驟
1.把Ajax.dll copy到應用系統bin目錄下,然後在工程引用中引用Ajax.dll,如果沒有的話可以到網上下載下傳
2.配置web.config,添加如下資訊
< httpHandlers >
< add verb ="POST,GET" path ="ajax/*.ashx" type ="Ajax.PageHandlerFactory, Ajax" />
</ httpHandlers > 3.假設應用系統叫Document,目錄格式為Pages/AjaxTest
4.在Pages/AjaxTest下建立cs檔案AjaxForm.cs,添加如下方法
// [Ajax.AjaxMethod]
[Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]
public static string GetNIVNumber( string str)
{
return str;
} 5.在Pages/AjaxTest下建立頁面AjaxForm.aspx
< HTML >
< HEAD >
< title > AjaxForm </ title >
< meta name ="GENERATOR" Content ="Microsoft Visual Studio .NET 7.1" >
< meta name ="CODE_LANGUAGE" Content ="C#" >
< meta name ="vs_defaultClientScript" content ="JavaScript" >
< meta name ="vs_targetSchema" content ="http://schemas.microsoft.com/intellisense/ie5" >
< script language ="javascript" >
function testAjax(owner, item, evt)
{
var first=document.getElementById("txtfirst");
AjaxMethod.GetNIVNumber(first.value,callback_GetNIVNumber);
}
function callback_GetNIVNumber(res)
{
var obj=document.getElementById("txtsecond");
obj.value=res.value;
}
</ script >
</ HEAD >
< body MS_POSITIONING ="GridLayout" >
< form id ="Form1" method ="post" runat ="server" >
< INPUT style ="Z-INDEX: 101; LEFT: 208px; POSITION: absolute; TOP: 40px" type ="button" value ="Button"
onclick ="testAjax();" >
< asp:TextBox id ="txtfirst" style ="Z-INDEX: 102; LEFT: 40px; POSITION: absolute; TOP: 40px" runat ="server" ></ asp:TextBox >
< asp:TextBox id ="txtsecond" style ="Z-INDEX: 103; LEFT: 40px; POSITION: absolute; TOP: 72px" runat ="server" ></ asp:TextBox >
</ form >
</ body >
</ HTML >
protected System.Web.UI.WebControls.TextBox txtfirst;
protected System.Web.UI.WebControls.TextBox txtsecond;
private void Page_Load( object sender, System.EventArgs e)
{
//注冊,其中Document.Pages.AjaxTest.AjaxMethod為AjaxMethod.cs方法所在的命名空間
Ajax.Utility.RegisterTypeForAjax(typeof(Document.Pages.AjaxTest.AjaxMethod));
} 然後運作就可以了,
實作效果:在第一個textbox中輸入内容,點選button,就把内容顯示到第二textbox中。這隻是一個簡單的示例,還可以修改調用方法,從資料庫讀取以及更複雜的操作