转自：http://blog.csdn.net/net_lover/article/details/2480585
这是论坛中的一个问题，很多人经常会遇到，就贴出来。
完整代码如下，实现在光标处插入上传后的文件名：
<%@ Page Language="C#" AutoEventWireup="true" %>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
TextBox1.Attributes.Add("onclick", "getCursor('" + TextBox1.ClientID + "','" + Hidden1.ClientID + "');");
}
protected void Button1_Click(object sender, EventArgs e)
{
string fileName = FileUpload1.FileName;
//保存文件省略
int pos = 0;
Int32.TryParse(Hidden1.Value, out pos);
TextBox1.Text = TextBox1.Text.Insert(pos, fileName);
}
</script>
<!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>ASP.NET 中在指定的位置处插入字符</title>
<script type="text/javascript">
function getCursor(param1,param2)
{
var pos = 0;
var t = document.getElementById(param1);
if(document.selection )
{
t.focus();
var rng = document.selection.createRange();
rng.setEndPoint("EndToStart", t.createTextRange());
pos = rng.text.length;
}
else if(t.selectionStart)
{
pos = t.selectionStart;
}
document.getElementById(param2).value = pos;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server" Width="629px">123456789</asp:TextBox>
<input id="Hidden1" type="hidden" runat="server" />
</div>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="上载文件" OnClick="Button1_Click" />
</form>
</body>
</html>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
TextBox1.Attributes.Add("onclick", "getCursor('" + TextBox1.ClientID + "','" + Hidden1.ClientID + "');");
}
protected void Button1_Click(object sender, EventArgs e)
{
string fileName = FileUpload1.FileName;
//保存文件省略
int pos = 0;
Int32.TryParse(Hidden1.Value, out pos);
TextBox1.Text = TextBox1.Text.Insert(pos, fileName);
}
</script>
<!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>ASP.NET 中在指定的位置处插入字符</title>
<script type="text/javascript">
function getCursor(param1,param2)
{
var pos = 0;
var t = document.getElementById(param1);
if(document.selection )
{
t.focus();
var rng = document.selection.createRange();
rng.setEndPoint("EndToStart", t.createTextRange());
pos = rng.text.length;
}
else if(t.selectionStart)
{
pos = t.selectionStart;
}
document.getElementById(param2).value = pos;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server" Width="629px">123456789</asp:TextBox>
<input id="Hidden1" type="hidden" runat="server" />
</div>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="上载文件" OnClick="Button1_Click" />
</form>
</body>
</html>
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