the sample URL is not working, can you please update it again.

I got this code that might help you (just edit the first 2 lines with the id of your country and phone field). The script also doesn’t let the user type any character except “+” and “0-9”, it also changes “00” to “+” when it’s typed at the beginning and it doesn’t accept spaces:

<script>

  var pais = document.getElementById("pais");

  var telefono = document.getElementById("telefono");

  

  function sustituyeTelefono() {

	if (telefono.value === '00') {

		telefono.value = '+'

	}

};



telefono.addEventListener('input', sustituyeTelefono);

  

function cambiaExtension() {  

  switch (pais.value) {

    case "Colombia":

      telefono.value = '+57';

      break;

    case "Mexico":

      telefono.value = '+52';

      break;

    case "Argentina":

      telefono.value = '+54';

      break;   	

    case "Chile":

      telefono.value = '+56';

      break;

    case "Peru":

      telefono.value = '+51';

      break;

    case "El Salvador":

      telefono.value = '+503';

      break;

    case "Honduras":

      telefono.value = '+504';

      break;

    case "Guatemala":

      telefono.value = '+502';

      break;

    default:

      telefono.value = '+';	



  }

};

  

pais.addEventListener('change', cambiaExtension);

  

function todoNumeros(){

      var invalidMatcher = /v^0-9+]+/;

      telefono.value = telefono.value.replace(invalidMatcher, '');

};

  

telefono.addEventListener('input', todoNumeros);



  

</script>

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