Change 0 to +62 on Phone Number

by Sendy Aditya Suryana

HTML

<input type="tel" id="phone">

JavaScript

var tel = document.getElementById("phone");
var cek = document.getElementById("submit");
tel.onblur = function() {
  var firstDigit = tel.value.split("")[0];
  var secondDigit = tel.value.split("")[1];
  var groupDigit = firstDigit + secondDigit;
  if (groupDigit == 62) {
  	tel.value = '+' + tel.value;
  } else if (firstDigit == 0) {
  	tel.value = '+62';
  } else if (firstDigit != '+') {
  	tel.value = '+62' + tel.value;
  }
}