numeric validation in textbox

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i want source for textbox only enter phone number and allow + into the textbox starting phone number. for ex:+65478474632

Posted 21-Nov-11 23:14pm

dhanushkodimca

Updated 21-Nov-11 23:15pm

v2

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Reiss · Answer 1 · 2011-11-22T02:15:00

Using a regular expression validator with the pattern ^\+?\d+$ will perform the validation you need

^\+? means that the text can contain zero or one instance of the + charcater at the start of the text only

\d+$ means that the text must then contain one or more digits before the end of the text

I would recommend that you download a free tool like Expresso to help you with your regex creation process

vikranthreddych · Answer 2 · 2011-11-21T23:30:00

Solution 1

for numeric validation use regular expresion field validator

and the regular expression for this is ^\d+$

and adding + is done in coding section like
string s="+"+textbox1.text;
store this "s" into the database.

hope this is working.

Posted 21-Nov-11 23:30pm

vikranthreddych

Sergey Alexandrovich Kryukov · Answer 3 · 2011-11-22T12:54:00

The only really reliable way to validate if a string can be interpreted as some numeric type is to try parse it, for example:

C#

bool valid = int.TryParse(myTextBox.value);

You can also estimate validity and find out problem of parsing if you use the variant of it with exception:

C#

internal struct ValidationResult {
   internal ValidationResult(double value) { this.fValue = value; } //fException remains null
   internal ValidationResult(System.Exception exception) { this.fExcepton = exception; }
   internal bool IsValid { get { return fException == null; } }
   internal System.Exception Exception { return fException; }
   internal double Value { return fValue; }
   System.Exception fException;
   double fValue;
}

ValidationResult Validate(string value) {
   try {
      return new ValidationResult(double.Parse(value));
   } catch (Exception e) {
      return new ValidationResult(e);
   }
}

Same thing with int, etc. Using generics with primitive types is difficult, to say the least.

The solutions based on regular expressions and other ways to analyze input strings are not effective. The value can pass the check but still throw out-of-range exceptions.

—SA

vinoth kumar rajendran · Answer 4 · 2011-11-22T16:20:00

JavaScript

<script language = "Javascript">

var digits = "0123456789";

var phoneNumberDelimiters = "()- ";

var validWorldPhoneChars = phoneNumberDelimiters + "+";

var minDigitsInIPhoneNumber = 10;

function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {

        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }

    return true;
}
function trim(s)
{   var i;
    var returnString = "";

    for (i = 0; i < s.length; i++)
    {

        var c = s.charAt(i);
        if (c != " ") returnString += c;
    }
    return returnString;
}
function stripCharsInBag(s, bag)
{   var i;
    var returnString = "";

    for (i = 0; i < s.length; i++)
    {

        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function checkInternationalPhone(strPhone){
var bracket=3
strPhone=trim(strPhone)
if(strPhone.indexOf("+")>1) return false
if(strPhone.indexOf("-")!=-1)bracket=bracket+1
if(strPhone.indexOf("(")!=-1 && strPhone.indexOf("(")>bracket)return false
var brchr=strPhone.indexOf("(")
if(strPhone.indexOf("(")!=-1 && strPhone.charAt(brchr+2)!=")")return false
if(strPhone.indexOf("(")==-1 && strPhone.indexOf(")")!=-1)return false
s=stripCharsInBag(strPhone,validWorldPhoneChars);
return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

function ValidateForm(){
    var Phone=document.frmSample.txtPhone

    if ((Phone.value==null)||(Phone.value=="")){
        alert("Please Enter your Phone Number")
        Phone.focus()
        return false
    }
    if (checkInternationalPhone(Phone.value)==false){
        alert("Please Enter a Valid Phone Number")
        Phone.value=""
        Phone.focus()
        return false
    }
    return true
 }
</script>

Sajith Dilhan · Answer 5 · 2011-11-22T18:17:00

Use Regular expressions to validate the user input

C#

if (textBoxTelephone.Text != string.Empty && !(System.Text.RegularExpressions.Regex.IsMatch(textBoxTelephone.Text, ^(((((\d{3}))|(\d{3}-))\d{3}-\d{4})|(+?\d{2}((-| )\d{1,8}){1,5}))(( x| ext)\d{1,5}){0,1}$)
{
    // Your code here
}

Use a matching regular expression in the if condition

numeric validation in textbox

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