CODEWITHSUNDEEP
.netasp.netvalidationrangevalidator
Pankaj Agarwal
Pankaj Agarwal

Reputation: 11311

RangeValidator Can't Count?

I am trying to validate length of a string in a TextBox. Controls on page defined as follows:

<asp:TextBox runat="server" ID="TB" />
<asp:RangeValidator runat="server" ID="RV" 
MinimumValue="3" MaximumValue="20" 
ControlToValidate="TB" Type="String" />

But when page runs there is run time error occurred

The MaximumValue 20 cannot be less than the MinimumValue 3

Upvotes: 4

Views: 5660

Answers (4)

Zia Khan
Zia Khan

Reputation: 425

The syntax that worked for me correctly

 <asp:RegularExpressionValidator ID="RegularExpressionValidator34" runat="server" ControlToValidate="fname" 
            Display="Dynamic" ErrorMessage="email is required" ForeColor="Red" SetFocusOnError="True" 
            ValidationExpression="(\s|.){5,10}"> 
                  Length must between (5-10) characters</asp:RegularExpressionValidator>

Upvotes: 0

Hasan Fahim
Hasan Fahim

Reputation: 3885

Just use TextBox's MaxLength propery. That is used to Get/Set maximum number of characters allowed in the text box.

For minimum length you'll need to use a CustomValidator. In that call a js function which checks the length of the string.

Try this:

<asp:TextBox runat="server" ID="TB" />    
<asp:CustomValidator runat="server" ID="CustomValidator1" ControlToValidate="TB"
    Text="The text length should be between 3 and 20" 
    ClientValidationFunction="clientValidate" Display="Dynamic">
</asp:CustomValidator>


<script type="text/javascript">
function clientValidate(sender, args) {
    if (args.Value.length < 3 ||args.Value.length > 20) {
        args.IsValid = false;
    }
}

Upvotes: 4

Akram Shahda
Akram Shahda

Reputation: 14771

You can not validate the length of a TextBox using a RangeValidator !! RangeValidator is used to validate the value of a field, not the length of this value.

To do that you can use other ways as CustomValidator.

Upvotes: 3

Muhammad Akhtar
Muhammad Akhtar

Reputation: 52241

You mention Type incorrect, it should be Type="Integer" instead Type="String"

Upvotes: 13

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