How to restrict length for a textbox

Question

3.40/5 (2 votes)

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I want to enter maximum of 100 characters only in a textbox. I used the following code but it allows beyond 100 characters. Can any one guide me?

XML

<asp:TextBox ID="TextBox3" runat="server" TextMode="MultiLine" MaxLength="100"
 OnTextChanged="TextBox3_TextChanged" Font-Size="Medium"
           style="z-index: 1; left: 930px; top: 178px; position: absolute;height: 40px; width: 225px"></asp:TextBox>

Thanks.

Posted 6-May-13 22:26pm

S.Rajendran from Coimbatore

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2 solutions

Solution 3

remove the property, TextMode="MultiLine"

XML

<asp:TextBox ID="TextBox3" runat="server"  MaxLength="100"
 OnTextChanged="TextBox3_TextChanged" Font-Size="Medium"
           style="z-index: 1; left: 930px; top: 178px; position: absolute;height: 40px; width: 225px"></asp:TextBox>

if you want to use multiline check no of characters on submit using
TextBox3.Text.Length

or use regular expression validator for text box3 and use regular expression : (\s|.){0,10}$

as follows

XML

<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"
        ControlToValidate="TextBox3" ErrorMessage="RegularExpressionValidator"
        ValidationExpression="(\s|.){0,10}$"></asp:RegularExpressionValidator>

Posted 6-May-13 23:12pm

Bikash Prakash Dash

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Thanks7872 · Accepted Answer · 2013-05-06T22:56:00

Solution 2

Wonderful example can be found here

Limit the Number of Characters in a Textarea or Text Field

or you can even try modifying code by replacing MaxLength with maxlength

Posted 6-May-13 22:56pm

Thanks7872

Updated 6-May-13 22:59pm

v3