calling javascript function in codebehind

hi
i have a function in javascript and i want to call it in codebehind.i have a server button and i want to call it when i click on.
please help me.

 

 
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
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 Pagetitle>
head>
<script language=javascript type="text/javascript">
function cMC(vmc) 
{//
var mc;
mc = vmc.value; 
if (mc.length == 10) 
{//
if (mc == '1111111111' || mc == '0000000000' || mc == '2222222222' || mc == '3333333333' || mc == '4444444444' || mc == '5555555555' || mc == '6666666666' || mc == '7777777777' || mc == '8888888888' || mc == '9999999999') 
{//
alert('dont right');
vmc.focus(); 
return false; 
}//
c = parseInt(mc.charAt(9)); 
n = parseInt(mc.charAt(0)) * 10 +parseInt(mc.charAt(1)) * 9 +parseInt(mc.charAt(2)) * 8 +parseInt(mc.charAt(3)) * 7 +parseInt(mc.charAt(4)) * 6 + parseInt(mc.charAt(5)) * 5 +parseInt(mc.charAt(6)) * 4 +parseInt(mc.charAt(7)) * 3 + parseInt(mc.charAt(8)) * 2;
r = n - parseInt(n / 11) * 11;
if ((r == 0 && r == c) || (r == 1 && c == 1) || (r > 1 && c == 11 - r)) 
{//
return true; 
}//
else 
{//
alert('dont right'); 
vmc.focus(); 
return false; 
}//
}//
else {//
alert('please insert 10 figure');
vmc.focus();
return false; 
}//
}//

script>

<form id="form1" runat="server">





<body>
<div>

<asp:TextBox ID="TextBox1" runat="server">asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" onclick=" cMC(document.getElementById('<%= TextBox1.ClientID %>'))" Height="26px" />



div>
form>
body>
html>

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Jaish Mathews16y ago
Accepted answer
Hi,
1. Use OnClientClick method
2. Also register a hidden control to store ClientID
HTML and JS
function cMC() {
var textBoxID = document.getElementById("textFieldValue").value;
var textBoxValue = document.getElementById(textBoxID).value;
alert(textBoxValue);
}

<asp:TextBox ID="TextBox1" runat="server">asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="cMC()" />
form>
C#
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{

ScriptManager.RegisterHiddenField(this, "textFieldValue", TextBox1.ClientID);

}
}