"+" sign in phone number Javascript

**blurguava** · Feb 21, 2010 23:07

Hi there, I would like to allow the "+" sign in my 3 textboxes. When the user does not put the "+" sign in the textboxes, and it is being validated, the system will allow it to pass.

Also, it must check that it has at least 8 digits.

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Untitled Page</title>
    <link rel="stylesheet" type="text/css" href="CSS files/specialAlignment.css" />
    <link rel="stylesheet" type="text/css" href="CSS files/externalCSS.css"/>    
    <script language = "javascript" type = "text/javascript">
    
function check() 
{
    var fields = new Array("Office Telephone", "Mobile Telephone","Fax Number");
    var telnr = /(^[\+]?[\d]{8,20}$)/;

    var index = new Array();  
    for(var i = 0; i < fields.length; i++)  
    {  
        var arrayFields = document.getElementsByName(fields[i]);  
        for(var j = 0; j < arrayFields.length; j++)  
        if(!(arrayFields[j].value) == "")  
        {   
            arrayFields[j].className = "defaultColor";              
        }  
        
        else  
        {  
            arrayFields[j].className ="changeToRed"; 
            index.push(fields[i]);                  
        }        
    }  
    
    if(index != 0)  
    {  
        joinComma = index.join(', ');  
        alert('The field(s) corresponding to '+ joinComma + ' is/are not filled in.');   
    }  
         
}  

function noSpace(e, dec)
{
    var key;
    var keychar;

    if (window.event) 
    {
       key = window.event.keyCode;
    }
    else if (e) 
    {
       key = e.which;
    }
    else 
    {
       return true;
    }
    keychar = String.fromCharCode(key);

    if ((key==null) || (key==0) || (key==8) ||  (key==9) || (key==13) || (key==27) /*|| (key==107)*/) 
    {
       return true;
    }
    else if ((("0123456789").indexOf(keychar) > -1)&& check(telnr.test(tfld))) 
    {
       return true;
    }
    else if (dec && (keychar == ".")) 
    { 
      return true;
    }
    else
       return false;
        
} 
    </script>
</head>
<body>
                        <label>
                            *Office Telephone:</label>
                        <input id="Text16" type="text" name="Office Telephone" onkeydown="return noSpace(event)" />
                        <br />
                        <br />
                        <label>
                            *Mobile Telephone:</label>
                        <input id="Text17" type="text" name="Mobile Telephone" onkeydown="return noSpace(event)" /><br />
                        <br />
                        <label>
                            *Fax Number:</label>
                        <input id="Text18" type="text" name="Fax Number" onkeydown="return noSpace(event)" />
                        <br />
                        <br />
                <input id="Submit17" type="submit" value="Submit" onclick="return check()"/>
 
</body>
</html>

**Stomme poes** · Feb 22, 2010 03:53

Hi there, I would like to allow the "+" sign in my 3 textboxes. When the user does not put the "+" sign in the textboxes, and it is being validated, the system will allow it to pass.

Also, it must check that it has at least 8 digits.

I am not understanding you. You want an (optional) + sign to be included with the numbers, okay. But then you say if they don't include it, it's still okay.

Does that mean you want the + to be required?

What is your current code doing?

I don't believe you are supposed to comment out the + inside the characterclass [] with a backslash. [\+] should not mean a literal +, but instead may be trying to preserve its special meaning instead.

var telnr = /^[+]?\d{8,20}$/;
or
var telnr = /^(\+)?\d{8,20}$/; (not sure about this one as +? would mean nongreedy match) *edit wrapped + in parens

I took out the parens because I didn't see you using \1 or anything with them... and if you wanted them literally, you would have needed to comment those out 

**Stomme poes** · Feb 22, 2010 04:05

Hm, and, question, is that whole big function noSpace(e, dec) there just to remove spaces and stuff from the input? You may be able to use a little regex instead that may be faster... match whatever's a number and use string.replace() onkeydown.

**blurguava** · Feb 22, 2010 07:41

Hi, what I meant was, if the user decides to key in the "+" sign, the system will accept it. Even if the user does not put in the "+" sign, the system will still allow the phone number.

The noSpace function is actually used to deter users from keying in spaces. I find this method better than using a regex function, whereby it still has to alert the user that no spaces are to be allowed. IMO, I find it a hassle to do so.

**Stomme poes** · Feb 22, 2010 08:57

The noSpace function is actually used to deter users from keying in spaces. I find this method better than using a regex function, whereby it still has to alert the user that no spaces are to be allowed. IMO, I find it a hassle to do so.

Ah.

Hi, what I meant was, if the user decides to key in the "+" sign, the system will accept it. Even if the user does not put in the "+" sign, the system will still allow the phone number.

So are you saying that currently, numbers with a + are failing validation? (I'm curious what exactly the HTML is supposed to be... it looks almost like a form but there are no form tags...)

I still think that the way you've got it set in the var telnr is incorrect.

Normally (JS noob that I am) I'll check my regex first, apart from the rest of the code, to make sure that it matches what I want. If I know my regex is good, then I can look at the rest of my code and know I've got an error elsewhere.

I'm still leaning to var telnr = /^(\+)?\d{8,20}$/; which only matched a possible + and 8-20 digits (it does not match anyone adding in the () many people add). Though I also don't see it actually getting checked anywhere either (I see the telnr.test(tfld) but don't see tfld anywhere else).

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