restricting characters entered in textbox using Javascript

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I need to validate a textbox that it should allow only certain characters and after the limit is reached the textbox should not allow entering characters in it.It can be done by Javascript but dont know how to do:confused:Anyone please help..

Posted 28-Jul-10 18:23pm

abi1988

Updated 28-Jul-10 18:41pm

v3

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sainath437 · Answer 1 · 2010-07-28T18:56:00

Go Through this code u will get it.....

XML

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Without master page</title>
     <script type="text/javascript" src="js/JScript.js" ></script>
</head>
<body>
    <form id="form1" runat="server">
     <div> <br />
    <div id="lblMsg1">240 characters left</div>
    <asp:TextBox ID="TextBox1" runat="server" Height="50px"MaxLength="240"TextMode="MultiLine"Width="600px" ToolTip="Summary:(240 characters)"onkeyup="return validateLimit(this, 'lblMsg1', 240)"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
            ControlToValidate="TextBox1" Display="Dynamic"
            SetFocusOnError="True">*</asp:RequiredFieldValidator>
    <br /><br /><br />
    <div id="lblMsg2">300 characters left</div>
    <asp:TextBox ID="TextBox2" runat="server" Height="50px" MaxLength="300" TextMode="MultiLine"Width="600px" ToolTip="Summary:(300 characters)"
                    onkeyup="return validateLimit(this, 'lblMsg2', 300)"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
            ControlToValidate="TextBox2" Display="Dynamic"
            SetFocusOnError="True">*</asp:RequiredFieldValidator>
    <br /> <br />
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
    <br />
    </div>
    </form>
</body>
</html>

Sandeep Mewara · Answer 2 · 2010-07-28T19:20:00

Solution 2

Here you go:
1. Tie a JavaScript function Validate() on textbox onKeyUp
2. in function Validate:

Try now!

Posted 28-Jul-10 19:20pm

Sandeep Mewara