Question

This is my first webpage in which I prompt the user for a phone number to add to a Do Not Call List database. Everything is working so far but I need to add the following, which I can do following the advice in this answer

• stripping the input from all characters except digits
• validating that the resulting string is 10 digits long

Then, when telling the user that the number was added to the list, I want to present it in the [phone] format.

Where should I add all that code? Iside the @{ } block? In JavaScript? Razor?

Answer 1

Check phone number

function IsNumber(s) {
    var i, currentCharacter;
    for (i = 0; i < s.length; i++) {
        // Check that current character is number.
        currentCharacter = s.charAt(i);
        if (((currentCharacter < "0") || (currentCharacter > "9"))) {
            return false;
        }
    }
    // All characters are numbers.
    return true;
}

function TestInternationalPhone(strPhone) {
    var bracket = 3,
    openBracket,
    phoneNumberOnly,
    phoneNumberDelimiters = "()- ",
    validWorldPhoneChars = phoneNumberDelimiters + "+",
    minDigitsInIPhoneNumber = 10;

    strPhone = SOS.StringHelper.Trim(strPhone);
    if (strPhone.length === 0) {
        return false;
    }
    if (strPhone.indexOf("+") > 1) {
        return false;
    }
    if (strPhone.indexOf("-") != -1) {
        bracket = bracket + 1;
    }
    if (strPhone.indexOf("(") != -1 && strPhone.indexOf("(") > bracket) {
        return false;
    }
    openBracket = strPhone.indexOf("(");
    if (strPhone.indexOf("(") != -1 && strPhone.charAt(openBracket + 2) != ")") {
        return false;
    }
    if (strPhone.indexOf("(") == -1 && strPhone.indexOf(")") != -1) {
        return false;
    }
    phoneNumberOnly = SOS.StringHelper.StripCharsInBag(strPhone, validWorldPhoneChars);
    return (IsNumber(phoneNumberOnly) && phoneNumberOnly.length >= minDigitsInIPhoneNumber);
}