CODEWITHSUNDEEP
c#asp.net
Aya Mohammad
Aya Mohammad

Reputation: 245

Range validator in asp.net doesn't work as expected

I have this RV for a textbox in my page : 

<asp:RangeValidator ID="titleRV" runat="server" ControlToValidate="titletxt" Font-Bold="True" Font-Size="Small" ForeColor="Red" MinimumValue="4" MaximumValue="100" Type="Integer" SetFocusOnError="True" Display="Dynamic" >Must be more than 3 !</asp:RangeValidator>

when I type any number of characters in my textbox at runtime the range validator appears whether I typed less than 3 letters or not ,and if I increased the number of letters it doesn't disappear! any help please ?

Upvotes: 1

Views: 3093

Answers (4)

Vishal Patel
Vishal Patel

Reputation: 973

Please try this.....

    <script type="text/javascript">
        function test()
        {
            if (document.getElementById('titletxt').value.length < 3) {
document.getElementById('spMessage').style.display = '';
                return false;
            }
            else {
document.getElementById('spMessage').style.display = 'none';
                return true;
            }
        }
        </script>

HTML....

<asp:TextBox runat="server" ID="titletxt" onblur="return test()"></asp:TextBox>
<span id='spMessage' style="font-weight:bold; font-size:small; color:Red; display:none">Enter more than 3 char!</span>

You can create this javascript and Call test() function to validate textbox....

Upvotes: 1

Liath
Liath

Reputation: 10191

A range validator is designed to check that you enter a value in a range - for example a number between 0 and 100. It sounds to me like you're trying to check how many letters were entered?

Assuming I've understood correctly my suggestion would be to use a RegEx validator.

You could use an expression like:

<asp:RegularExpressionValidator ID="valLength" runat="server"    
    ErrorMessage="Your text must be between 3 and 100 characters"       
    ValidationExpression="^[0-9a-zA-Z]{3,}$"
    ControlToValidate="txtTextBox" />

This will obviously require tweaking depending on the characters you allow

Upvotes: 2

crunchy
crunchy

Reputation: 703

Rangevalidator is to check that the value entered falls between two values, not that it is a certain length. What you seem to be looking for are length validators

 <asp:TextBox ID="txtTextBox" MaxLength="100" .../>

I don't think there is a minimum length validator built in, but you can easily add something in the code behind

if(txtTextBox.Length < 3)
    // display error message

or a regular expression validator

<asp:RegularExpressionValidator ID="valLength" runat="server"    
    ErrorMessage="Must be between 3 and 100 characters"
    ControlToValidate="txtTextBox"    
    ValidationExpression="^[a-zA-Z0-9'@&#.\s]{3,100}$" />

Upvotes: 2

Peter
Peter

Reputation: 27944

Your range validator validates if the number is between 4 and 100, not the number of chars in the textbox.

This will do the trick (CustomValidator):

<asp:TextBox runat="server" ID="titletxt" />    
<asp:CustomValidator runat="server" ID="CustomValidator1" ControlToValidate="titletxt"
    Text="The text length should be between 4 and 20" 
    ClientValidationFunction="clientValidate" Display="Dynamic">
</asp:CustomValidator>


<script type="text/javascript">
function clientValidate(sender, args) {
    if (args.Value.length < 4 ||args.Value.length > 20) {
        args.IsValid = false;
    }
}

Upvotes: 1

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