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attribute.add("onkeyup", ....);
<%@ 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></title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager" runat="server"></asp:ScriptManager>
UpdatePanel实现;
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:TextBox ID="TextBox2" AutoPostBack="true" runat="server"
onkeyup="__doPostBack('TextBox2','');" ontextchanged="TextBox2_TextChanged" ></asp:TextBox>
文本框内容的长度为:<asp:Label ID="Label1" runat="server" Text="0"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
<hr />
UpdatePanel实现;
<asp:UpdatePanel ID="up" runat="server">
<ContentTemplate>
<asp:TextBox ID="txt" AutoPostBack="true" runat="server" ontextchanged="txt_TextChanged"></asp:TextBox>
文本框内容的长度为:<asp:Label ID="lbl" runat="server" Text="0"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
<hr />
JS实现:<br />
<asp:TextBox ID="TextBox" runat="server" onkeyup="document.getElementById('span').innerText=this.value.length;"></asp:TextBox>
文本框内容的长度为:<span id="span">0</span>
<hr />
JS实现:(依赖ScriptManager)<br />
<asp:TextBox ID="TextBox1" runat="server" onkeyup="$get('span1').innerText=this.value.length;"></asp:TextBox>
文本框内容的长度为:<span id="span1">0</span>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Default2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void txt_TextChanged(object sender, EventArgs e)
{
lbl.Text = txt.Text.Length.ToString();
}
protected void TextBox2_TextChanged(object sender, EventArgs e)
{
Label1.Text = TextBox2.Text.Length.ToString();
}
}