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Phone Number Validation. Allow only 0 as first digit

debugcn Published at Dev
12
Jackson

i have a phone number validation where only numbers are allowed on keypress and first number should be 0. this is my jquery script:

jQuery("#phone-number").keypress(function(ev){
    var x = document.getElementById("phone-number").value;
    // Don't ignore numbers.
    if ((ev.charCode >= 64 && ev.charCode <= 91) || (ev.charCode >= 96 && ev.charCode <= 123) && x.charAt(0)!="0" ) {
                alert("it should start with 0 ");
                return false;
    }

});

x.charAt(0)!="0" is not working as any number can be passed as 1st digit.

Saurabh Mistry 

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" id="phone-number"/>

$(document).on('input','#phone-number',function(){
    var phone=$('#phone-number').val();
   if(phone.indexOf('0')!==0){
     alert('First number must be 0');
     $('#phone-number').val('');
   }
});

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