How to validate phone numbers based on country codes in Javascript.

For Example: India-starts with 91-xxxxxxxxxx, UK-44-xxxxxxxxxx, SZ-268-22xxxxxx and so on. Like this it should validate other countries country code with phone number which I will enter.

Below is the code which I tried but it is only for one country. Parallelly how to do validate with other countries country code.

function validateMobNo(mobno){
var mobno2;
var flag=false;
var mlen= mobno.length;
//alert(mobno.substr(3,mobno.length-3));
if(mobno.charAt(0)!='+' && mlen==10){
    mobno2="+91-"+mobno;
    alert("1>>your mobile wants to be in "+mobno2);
    flag=true;
}
else if(mobno.charAt(0)=='+'){
    if(mobno.substr(0,3)=='+91' && mobno.length==13){
        mobno2=mobno.substr(0,3)+"-"+mobno.substr(3,mobno.length-3);
        alert("2>>your mobile wants to be in "+mobno2);
        flag=true;      
    }
}
else if(mobno.indexOf("-")<0&&mobno.length==12 && mobno.substr(0,2)=='91'){
    mobno2=mobno.substr(0,2)+"-"+mobno.substr(3,mobno.length-2);
    alert("3>>your mobile wants to be in "+mobno2);
    flag=true;
    }
else
    alert("Please correct your mobile No");
if(flag==true)
   document.mobvalidate.mobno.value=mobno2;
else
    document.mobvalidate.mobno.focus()
return flag;

}

How to validate phone numbers based on country codes in Javascript.

For Example: India-starts with 91-xxxxxxxxxx, UK-44-xxxxxxxxxx, SZ-268-22xxxxxx and so on. Like this it should validate other countries country code with phone number which I will enter.

Below is the code which I tried but it is only for one country. Parallelly how to do validate with other countries country code.

function validateMobNo(mobno){
var mobno2;
var flag=false;
var mlen= mobno.length;
//alert(mobno.substr(3,mobno.length-3));
if(mobno.charAt(0)!='+' && mlen==10){
    mobno2="+91-"+mobno;
    alert("1>>your mobile wants to be in "+mobno2);
    flag=true;
}
else if(mobno.charAt(0)=='+'){
    if(mobno.substr(0,3)=='+91' && mobno.length==13){
        mobno2=mobno.substr(0,3)+"-"+mobno.substr(3,mobno.length-3);
        alert("2>>your mobile wants to be in "+mobno2);
        flag=true;      
    }
}
else if(mobno.indexOf("-")<0&&mobno.length==12 && mobno.substr(0,2)=='91'){
    mobno2=mobno.substr(0,2)+"-"+mobno.substr(3,mobno.length-2);
    alert("3>>your mobile wants to be in "+mobno2);
    flag=true;
    }
else
    alert("Please correct your mobile No");
if(flag==true)
   document.mobvalidate.mobno.value=mobno2;
else
    document.mobvalidate.mobno.focus()
return flag;

}

• javascript
• validation
• phone-number

• The simplest way would be to have an object which contains all the regex patterns to test the various different countries' phone number formats, keyed by the country code. Using string manipulation for this is going to make it a lot more plicated, and more brittle, than it needs to be – Rory McCrossan Commented Nov 16, 2016 at 9:34
• Someones already done the hard work for you this int-tel-input jQuery plugin would do the trick. – R. Chappell Commented Nov 16, 2016 at 9:37
• I have used this library in the past. It is well documented. Don't re-invent the wheel. github./googlei18n/libphonenumber – ppovoski Commented Nov 16, 2016 at 10:07

1 Answer 1

Using some method to loop over each country code and evaluates with regular erxpressions:

country_codes=['91-', 'UK-44-', 'SZ-268-22']
phone="91-123456789";

is_valid_number = country_codes.some(elem => phone.match('^' + elem));
console.log(is_valid_number );