How to validate phone and mobile number in javascript

Question

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Must be 12 characters
Must be numeric
e.g.:
aaaaaaaaaaaa: Invalid
0812888888aa: Invalid
081288128812: Valid
Thanx

What I have tried:

function numeric(text){
var numeric="1234567890";
for(var i=0; i < text.length; i++){
return false;
}
}

and
else if(numeric(phone)==false){ msg.innerHTML="harus angka";
}

Posted 12-Jun-17 6:16am

Alvin Calvin

Updated 12-Jun-17 8:08am

Richard MacCutchan

v2

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Richard MacCutchan 12-Jun-17 12:32pm

What is the question?

Richard Deeming 12-Jun-17 14:25pm

In addition to validating the value, you should set the input type to tel; it doesn't do much in desktop browsers, but on phones and tables, it ensures that the correct keyboard shows up when the field is focussed, which makes it much easier to enter a number.

Browser support[^] is pretty much ubiquitous at this point. Any ancient browsers which don't support it will fall back to the text input type, so you won't break anything.

HTML5 forms input types[^]

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Patrice T · Answer 1 · 2017-06-12T08:08:00

This RegEx should do it:
^\d{12}$

A few interesting links to help building and debugging RegEx.
Here is a link to RegEx documentation:
perlre - perldoc.perl.org[^]
Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[^]
Expresso Regular Expression Tool[^]
This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx:
Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]

Kornfeld Eliyahu Peter · Answer 2 · 2017-06-12T07:07:00

Solution 1

For all this kind of validation the best tool is regexp...
Regular Expressions - JavaScript | MDN[^]

Posted 12-Jun-17 7:07am

Kornfeld Eliyahu Peter

RickZeeland · Answer 3 · 2017-06-12T07:50:00

I'm not an experienced javascript developer, but I think this will do it:

JavaScript

function numeric(text){
    var numeric="1234567890";
    
    if (text.length != 12)
    {
      alert("invalid length !");
      return false;
    }
    
    for(var i=0; i < text.length; i++)
    {
      if (!numeric.includes(text[i]))
      {
      	 alert("invalid !");
         return false;
      }
    }
    
    alert("Valid !");
    return true;
}

How to validate phone and mobile number in javascript

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