how to validate a textbox which should take one 3 digits after deciaml point

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Hi all,

In my web application i have some fields that are Lenght, Breadth,Height, Distance.
Here my requirement is while get input date for this fields from user i need to check how many digits are entered after decimal point value, for example 233.345.

if user enter value like 3443.83839 it should through error msg to user that after decimal point only 3 digits should be enter.

How can i achive this with customvalidator, please give me the coding and suggest me to get it.

Thanks all

uday

Posted 21-Nov-11 21:46pm

udaysimha

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OriginalGriff · Answer 1 · 2011-11-21T21:54:00

Solution 1

Since the textbox only returns a string, use the IndexOf method to give you the position of the decimal point, and compare it against the Length of the Text property.

Posted 21-Nov-11 21:54pm

OriginalGriff

Comments

udaysimha 22-Nov-11 4:59am

Hi

Thanks for your reply.Please can you explain with some example code.

Any help would be appriciated.

Thanks
Uday

OriginalGriff 22-Nov-11 5:05am

You are joking, right?
string s = "123.123";
int decPos = s.IndexOf('.') + 1;
if (decPos >= 1 && (s.Length - decPos) > 3)
{
// Bad user!
Console.WriteLine("Bad");
}

udaysimha 22-Nov-11 5:30am

Hi Boss,

Thanks for your quick reply, i am not joking, i am a beginer past 2 monts only i am working in asp.net.

Actual my requirement is i am tryint to validate textbox value with CustomeValidator to check how many digits are entered after decimal point if it exits.If it is more then 3 digits it should not be accept user input.

just follow my code what i tryed
function Chkdecimalvalidation(serber, args)
{
var txtval=args .Value;
var splitvalue=txtval.Value.split(".",2);

if(isNaN (splitvalue[0])|| isNaN (splitvalue[1]))
{
if(splitvalue[1]!= null )
{
if(splitvalue [1].length == 3)
{
args .IsValid=true ;
}
else
{
args .IsValid=false ;
}
}
else
{
args .IsValid=false ;
}
}
else
{
args .IsValid=false ;
}
}
i am not getting correct result. I think split() is not avilable here.

Please help me.

Thanks

OriginalGriff 22-Nov-11 5:37am

Right, so you are doing it in Javascript.
No, you don't want or need Split.
Look at my example, and at these two links:
http://www.w3schools.com/jsref/jsref_indexof.asp
http://www.w3schools.com/jsref/jsref_length_string.asp

udaysimha 22-Nov-11 6:04am

HiI looked at your exampls and links, in that founds only index of a specified character.
Here my requirement is to find decimal point if it exits and no.of digits after decimal.If there is no decimal point no need to check the user input.

I am calling Chkdecimalvalidation(serber, args) function from CustomValidator here.

OriginalGriff 22-Nov-11 6:25am

Yes, and if you read what the link says: "This method returns -1 if the value to search for never occurs."
Get the index to the first decimal point. If it is not negative, then a decimal point exists. The length of the string, minus the index of the decimal point plus 1 gives you the number of digits after the decimal point.
Exactly as my example showed...

udaysimha 22-Nov-11 8:23am

yes now i understood what your said, i tryed like below

function Chkdecimalvalidation(sender, args)
{
var s = args.Value;

var decPos = s.IndexOf('.') + 1;
if (decPos >= 1 && (s.Length - decPos) > 3)
{
args .IsValid=true ;
}
else
{
args .IsValid=false ;
}
}

even thought i did`t result.

OriginalGriff 22-Nov-11 8:32am

If you look at my example, the condition gives you a BAD result, not a GOOD result...

udaysimha 22-Nov-11 8:57am

hi bossplease explain me under standable form, yes i am a BAD programer....
whether the way i am following is right? give me your valuble suggetions.

OriginalGriff 22-Nov-11 9:35am

No, I didn't say you are a bad programmer...
The condition as I gave it to you detects when there is a decimal point, and there are more than three digits after it. I.e. when the user entered a invalid number.
So, put your args.IsValid=false in the if condition, and args.IsValid=true in the else condition.

udaysimha 23-Nov-11 0:19am

Hi boss,

I changed code like you suggested,and i execute my application by giving wrong input that is like 423.1, customvalidator is returning true and the rest of controls in page are not validating by Requiredfield validator and page returning true then system throwing "input string was not in corret format" .

Is IndexOf() is available to the function Chkdecimalvalidation(sender, args)?

Eduard Lu · Answer 2 · 2011-11-21T23:00:00

Solution 2

Hi udaysimha,

try using reg-ex for it.

Try this:

^[0-9]([\.\,][0-9]{1,3})?$

Hope it helps :)

Regards,
Eduard

Posted 21-Nov-11 23:00pm

Eduard Lu

Updated 21-Nov-11 23:03pm

v2

Comments

udaysimha 22-Nov-11 5:38am

Hi Eduard Lu

Thanks for your reply,i tryed with you suggestd reg-ex ^[0-9]([\.\,][0-9]{1,3})?$

it`s not working, i tryed by givig values like 234(should accept),
233.334(should accept), 23.1(shold not accept), 233.43235(should not accept)

follow my code:

<asp:RegularExpressionValidator ID="revlength" runat ="server" ControlToValidate ="txtLength"
ErrorMessage="wrong" ValidationExpression ="^[0-9]([\.\,][0-9]{1,3})?$" >