How to Validate the textbox inside the dynamic gridview by accessing the textbox with client ID ?

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This is the code inside gridview and am dynamically generating row on Add button .


<ItemTemplate>
                                        <asp:TextBox ID="txtweight_fact" runat="server" Height="41px" Width="42px"
                                            OnKeyPress="return isNumberKey(this,event);"  text="0.00"
                                            MaxLength="4" ></asp:TextBox>
                                        <br />
                                        <asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" Display="Dynamic"
                                            ControlToValidate="txtweight_fact" ErrorMessage="*" ValidationGroup="valgrp_func"></asp:RequiredFieldValidator>

                                    </ItemTemplate>

The Code for add button
 <FooterTemplate>
                                    <center>
                                           <asp:Button ID="BtnAdd" runat="server" OnClick="ButtonAdd_Click" ValidationGroup="valgrp_func"
                                Text="Add" /></center>
                                    </FooterTemplate>

I want to validate the textbox with Id "txtweight_fact" but not able to validate using the client ID .
Please suggest solution.
Regards
Ni!E$#UPDATED

Posted 20-Feb-14 16:52pm

Ni!E$H_WAGH

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2 solutions

Solution 1

refer here..

Numeric-validation-for-TextBox-inside-GridView-using-JavaScript-or-jQuery-in-ASPNe
Text-box-to-accept-only-number

Posted 20-Feb-14 17:47pm

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Peter Leow · Accepted Answer · 2014-02-20T18:38:00

Adapt from this example:

XML

<%@ 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 id="Head1" runat="server">
<title></title>
<script  type="text/javascript">
    function validateNumberRange(sender) {
        var e = sender;
        var textboxVal = e.value;
        if (textboxVal >= 0.00 && textboxVal <= 1.00) {
            return true;
        }
        else
            alert('Please enter a number between 0.00 to 1.00');
        return false;
    }
</script>
</head>
<body>
    <form id="form1" runat="server">

    <asp:GridView ID="GridView1" runat="server">
        <Columns>
            <asp:TemplateField HeaderText="Text Box Column">
                <ItemTemplate>
                    <asp:TextBox ID="textbox1" runat="server" onkeyup="return validateNumberRange(this);"/>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

    </form>
</body>
</html>