如何动态添加textbox并且取值

js添加input text,name相同,Request.Form["input's Name"]获得值

把动态生成的所有文本框命一个相同的名字。如：name="txt"
然后用js读取里面的值。
function getTxt()
{
  var obj=document.getElementsByName("txt");
  var len=obj.length;
  for(var i=0;i <len;i++)
  {
   var txtValue=obj[i].value; ---获得值
  }
}

页面中放置一个
protected System.Web.UI.WebControls.PlaceHolder PlaceHolderExamPaper;在要加载文本框的位置写上：
TextBox TxtAnswer= new TextBox();PlaceHolderExam.Controls.Add(TxtAnswer);

页面中放置一个
protected System.Web.UI.WebControls.PlaceHolder PlaceHolderExamPaper; 在要加载文本框的位置写上：
TextBox TxtAnswer= new TextBox();
TxtAnswer.ID=文本框ID；PlaceHolderExam.Controls.Add(TxtAnswer);
string stxt = ((TextBox)Page.findControl(文本框ID)).text ;

如:<asp:PlaceHolder ID="PlaceHolder1" runat="server">
            <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
            <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox><br />
            <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox><br />
            <asp:TextBox ID="TextBox4" runat="server"></asp:TextBox><br />
            <asp:TextBox ID="TextBox5" runat="server"></asp:TextBox><br />
        </asp:PlaceHolder>

        <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
        <br />
        <asp:Label ID="Label1" runat="server" Text=""></asp:Label> protected void Button1_Click(object sender, EventArgs e)
    {
        string result = string.Empty;
        foreach( Control ctrl in PlaceHolder1.Controls )
        {
            if (ctrl.GetType () == typeof (TextBox ))
            {
                TextBox tb = ctrl as TextBox;
                result = result + "," + tb.Text;
            }
        }        if (result.Length > 0)
        {
            this.Label1.Text = result.Substring(1);
        }
    }

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="TextBox.aspx.cs" Inherits="TextBox" %><!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>无标题页</title>
    <script language="javascript" type="text/javascript">
    var count=0;
    function AddTextBox()
    {
        var div=document.getElementById('div');
        div.insertAdjacentHTML("beforeEnd","<input type='text' id='txt"+count+"' name='txt"+count+"' /><br>");
        count++;
    }
    function SetValue()
    {
        document.getElementById('<%=hidCount.ClientID %>').value=count;
    }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div id="div">
    </div>
    <input type="button" id="btnAdd" value="增加" onclick="AddTextBox()" />
    <asp:Button ID="btnSubmit" runat="server" Text="提交" OnClientClick="SetValue()" OnClick="btnSubmit_Click" />
    <asp:HiddenField ID="hidCount" runat="server"  />
    </form>
</body>
</html>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;using System.Collections.Generic;
using System.Text;
public partial class TextBox : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            hidCount.Value = "0";
        }
        //Response.Write(hidCount.Value+"<br>||<br>");
    }
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        List<string> l = new List<string>();
        int count = 0;
        int.TryParse(hidCount.Value, out count);
        for (int i = 0; i < count; i++)
        {
            l.Add(string.IsNullOrEmpty(Request.Form["txt" + i.ToString()]) ? null : Request.Form["txt" + i.ToString()]);
        }
        StringBuilder sb = new StringBuilder();
        sb.Append("<script>document.getElementById('div').innerHTML=\"");
        for (int i = 0; i < l.Count; i++)
        {
            sb.Append("<input type='text' id='txt" + i + "' name='txt" + i + "' value='" + (l[i] == null ? "" : l[i]) + "' /><br>");
        }
        sb.Append("\";count=" + hidCount.Value + ";</script>");
        ClientScript.RegisterStartupScript(GetType(), "AddTextBox", sb.ToString());
    }
}

如果我要给每个新加入的textbox都加上onblur事件，怎么做？

To 9楼:
再写一个方法: private void AddBlurAttribute(Control cntrl)
    {
        if (cntrl.Controls.Count > 0)
        {
            foreach (Control childControl in cntrl.Controls)
            {
                AddBlurAttribute(childControl);
            }
        }        if (cntrl.GetType() == typeof(TextBox))
        {
            TextBox tb = (TextBox)cntrl;

            tb.Attributes.Add("onBlur", ".....");
        }
    }
然后在page_Load中写上:
AddBlurAttribute(PlaceHolder1);

function AddTextBox()
    {
        var div=document.getElementById('div');
        div.insertAdjacentHTML("beforeEnd","<input type='text' id='txt"+count+"' name='txt"+count+"' onblur='函数名();' /><br>");
        count++;
    }

sandy945说的有点意思，可惜不完整！

如:
HTML code <asp:PlaceHolder ID="PlaceHolder1" runat="server">
            <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
            <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox><br />
            <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox><br />
            <asp:TextBox ID="TextBox4" runat="server"></asp:TextBox><br />
            <asp:TextBox ID="TextBox5" runat="server"></asp:TextBox><br />
        </asp:PlaceHolder>

        <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
        <br />
        <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
C# code protected void Button1_Click(object sender, EventArgs e)
    {
        string result = string.Empty;
        foreach( Control ctrl in PlaceHolder1.Controls )
        {
            if (ctrl.GetType () == typeof (TextBox ))
            {
                TextBox tb = ctrl as TextBox;
                result = result + "," + tb.Text;
            }
        }        if (result.Length > 0)
        {
            this.Label1.Text = result.Substring(1);
        }
    }
//添加事件
C# code private void AddBlurAttribute(Control cntrl)
    {
        if (cntrl.Controls.Count > 0)
        {
            foreach (Control childControl in cntrl.Controls)
            {
                AddBlurAttribute(childControl);
            }
        }        if (cntrl.GetType() == typeof(TextBox))
        {
            TextBox tb = (TextBox)cntrl;

            tb.Attributes.Add("onBlur", ".....");
        }
    } 我摘录的代码,给楼主看看哈.源文档 <http://topic.csdn.net/u/20090325/12/4f891768-01ae-4b03-8a68-1f833964bf1e.html>

调试易

如何动态添加textbox并且取值

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