前台js添加下拉框内容，后台怎样获取

benjamin8064 2014-12-10 01:11:33

当前代码需要按两次按钮才能获取到，请大神纠正，源代码如下
///
////以下为test.aspx内容
///
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test.aspx.cs" Inherits="test" %>
<!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>test</title>
<script type="text/javascript" language="javascript">
function AddAttachment() {
var objfile = document.getElementById("fileupload");
var objtxt = document.getElementById("txtAttachment");
objfile.click();
if (objfile.value != "") {
var thisFileName = "";
getFileName = objfile.value.split("\\");
thisFileName = getFileName[getFileName.length - 1];
if (objtxt.value.indexOf(thisFileName) == -1) {
objtxt.value = objtxt.value + ";" + thisFileName + "|" + objfile.value;
}
else
alert("添加附件失败，选中的文件名已存在！");
}
TXTtoDDL();
}

function DeleteAttachment() {
var objddl = document.getElementById("ddlAttachment");
var objtxt = document.getElementById("txtAttachment");
objtxt.value = objtxt.value.replace(";" + objddl.options[objddl.selectedIndex].text + "|" + objddl.options[objddl.selectedIndex].value, "");
TXTtoDDL();
}

function TXTtoDDL() {
var objddl = document.getElementById("ddlAttachment");
var objtxt = document.getElementById("txtAttachment");
objddl.options.length = 0;
objddl.options.add(new Option("----附件----", ""));
getTXT = objtxt.value.split(";");
for (var i = 1; i <= getTXT.length - 1; i++) {
getFile = getTXT[i].split("|")
objddl.options.add(new Option(getFile[0], getFile[1]));
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<div style="display:none"><asp:fileupload ID="fileupload" runat="server" /></div>
<select id="ddlAttachment" runat="server"><option selected="selected" >----附件----</option></select> <a href="javascript:AddAttachment();">添加附件</a> <a href="javascript:DeleteAttachment();">删除附件</a> <asp:TextBox ID="txtAttachment" runat="server" AutoPostBack="true"></asp:TextBox><asp:button id="button1" runat="server" text="button1" OnClick="button1_Click"/>
</div>
</form>
</body>
</html>
///
///以下为test.aspx.cs内容
///
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class test : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
}
}

protected void button1_Click(Object s, EventArgs e)
{
Response.Write("<" + "script language='JavaScript'>alert('" + Request["txtAttachment"].ToString() + "');<" + "/script>");
}
}

...全文