从webservice读取string[]至downlist，增加onchange事件，更改相关显示。

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WebService ASP JavaScript Web XHTML

aspx页面

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>

<!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>Untitled Page</title>

<scriptlanguage="javascript"type="text/javascript">

functionButton1_onclick(){

WebService.getStr(callComplete);

}

functionaa()

{

varList=document.getElementById("dd1");

document.getElementById("Label1").innerHTML=List.options[List.selectedIndex].value;

}

functioncallComplete(result)

{

varList=document.getElementById("dd1");

for(x=List.options.length-1;x>-1;x--)

{

List.remove(0);

}

for(x=0;x<result.length;x++)

{

varoption=document.createElement("option");

option.text=result[x];

option.value=result[x];

if(window.navigator.appName.toLowerCase().indexOf("microsoft")>-1)

List.add(option);

else

List.add(option,null);

}

</script>

</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
<Services>
<asp:ServiceReference Path="WebService.asmx" />
</Services>
</asp:ScriptManager>
<input id="Button1" type="button" value="button" language="javascript" onclick="return Button1_onclick()" />
<asp:DropDownList ID="dd1" runat="server">
</asp:DropDownList>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</form>
</body>
</html>

webservice代码：

usingSystem;
usingSystem.Web;
usingSystem.Collections;
usingSystem.Web.Services;
usingSystem.Web.Services.Protocols;
usingSystem.Web.Script.Services;
usingSystem.Data;

///<summary>
///WebService的摘要说明
///</summary>
///
[ScriptService]
[WebService(Namespace="http://tempuri.org/")]
[WebServiceBinding(ConformsTo=WsiProfiles.BasicProfile1_1)]
publicclassWebService:System.Web.Services.WebService{

publicWebService(){

//如果使用设计的组件，请取消注释以下行
//InitializeComponent();
}

[WebMethod]
publicstringHelloWorld(){
return"HelloWorld";
}

[WebMethod]
publicstring[]getStr()
{

returnnewstring[]{"HelloWorld","bbb","cccc"};
}

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