Allow numeric in textbox

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Hello,

Im develpoing a web application.. i want to allow numbers in textbox ..
This is the code which im using in aspx for validtaion but couldn't get the result ..
can any one help me to solve this...

Thank you

C#

<asp:RegularExpressionValidator ID ="RegularExpressionValidator_CardCode" runat="server" ControlToValidate="RadTb_CardCode" ErrorMessage="CardCode Invalid(Numbers Only)" Display="Dynamic" ValidationExpression="^\d*"></asp:RegularExpressionValidator>

Posted 1-Sep-15 23:20pm

Member 11148509

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Member 11148509 2-Sep-15 10:52am

Thanks all of u for ur suggestions..i have small problem with my code while working with regularexpressions and i solved that ..
Thank u

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Animesh Datta · Answer 1 · 2015-09-01T23:33:00

Solution 1

Hello ,
Change the ValidationExpression from

ValidationExpression="^\d*"

to

ValidationExpression="^\d+$"

Posted 1-Sep-15 23:33pm

Animesh Datta

Comments

Andy Lanng 2-Sep-15 5:41am

depending on the version of .net, you can change the asp:textbox textmode to Number so the user can't enter anything but numbers. I'm not sure how good it is with decimals though

Member 11148509 2-Sep-15 5:42am

ya i have tried that but dint work out ...i have small doubt..i have entered characters in textbox so it should immediately tell only numeric are allowed ...can i get that by using this regularexpression ???actually im doing using telerik and using radtextbox...

Andy Lanng 2-Sep-15 5:44am

Ha - RadNumericTextbox ^_^
RadNumericTextbox Documentation
You can also set currency, decimals etc

Member 11148509 2-Sep-15 5:44am

textmode is used for displaying mutliline or singleline ryt??? and im using VS 2013

Andy Lanng 2-Sep-15 5:45am

it depends on the version of .Net
html5 uses textmode so it only "looks" available in .Net4+, but you can still use it in previous versions.
They expanded on the textmodes available greatly. If the browser supports it then you can use it ^_^

Member 11148509 2-Sep-15 5:57am

im using radtextbox...im unable to get the one which u told ....

Member 11148509 2-Sep-15 6:46am

any other method???

Andy Lanng 2-Sep-15 7:20am

sure. I have a texbox that validates bank card number on keypress(so every key). You don't need anything so elaborate but if you are using jQuery:
$(function(){
....$(".numeric").keypress(function(e){
........if (e.which != 8 && isNaN(String.fromCharCode(e.which))) {
...........e.preventDefault(); //stop character from entering input
........}
....});
})
Add that javascript and give the textbox the cssClass="numeric"

If your not using jQuery, start using it ^_^

Andy Lanng · Answer 2 · 2015-09-02T02:15:00

Solution 2

I have a textbox for card details which not only validates the card on each digit entered but also identifies the provider. I used jQuery to do this and prevent NaN's from being entered

JavaScript

$(function(){ //on doc.ready
    $('.numeric').keypress(function(event) {
        // keycode 8 is backspace
        if (event.which != 8 && isNaN(String.fromCharCode(event.which))) {
            event.preventDefault(); //stop character from entering input
        }
    }
}

Now just add the class numeric to your control and voila!

If you're not using jQuery, start using it ^_^

Hope that helps
Andy

Posted 2-Sep-15 2:15am

Andy Lanng

Comments

Andy Lanng 2-Sep-15 8:15am

gah - at last my post actually worked >_<

Member 11148509 2-Sep-15 8:18am

Actually mine is web application ...so its better to use textchanged event or should use in aspx .....anyways i will try ur post hope it works

Andy Lanng 2-Sep-15 8:20am

Mine is also a web application.
you can't use textchanged event. It'll post back every type the user types.
It doesn't matter if it's a web app. You should perform these kind of things client side, ie.e javascript / jquery

Member 11148509 2-Sep-15 8:24am

Thank u and can i know why this regularexpression is not working???

Andy Lanng 2-Sep-15 8:28am

Check Animesh Datta's solution.
^ = begin text
\d = digit
* = zero or more.
So if you have a string "this is NaN"
The start of the string has zero or more digits so it is valid.
If you end with $:
$ = end text
the "^\d*$" means between the start AND end only zero or more digits are allowed
I hope that makes sense ^_^

Member 11148509 2-Sep-15 8:30am

i have tried that dint get...

Andy Lanng 2-Sep-15 8:36am

oh. I dunno then. even the msdn page says it's fine: How To: Use Regular Expressions to Constrain Input in ASP.NET. Personally I would use the jquery solution. Maybe have a message or tooltip appear when they try to enter a NaN char to tell them that only numbers can be entered.
If you want a good web app then you will have to add some client-side processing

Maciej Los · Answer 3 · 2015-09-02T03:33:00

Solution 3

Start here:
How to: Create a Numeric Text Box[^]
How to: Control User Input in a Numeric Text Box[^]

Posted 2-Sep-15 3:33am

Maciej Los