{JS} Input fields validations and replacements, LT phone number

js_input_validations.js

    //phone format for LT countries
    var telInput = document.getElementById('billing_phone');
    telInput.addEventListener("keyup", function onKeyUp(e){
        var input = e.target;
        input.style.borderColor = 'initial';

        //get country and check if its LT
        if( !isCountry("LT") ) return;

        //format number
        var formatted = formatPhoneText(input.value);

        //validate
        if( formatted.length >= 12 ) {
            formatted = formatted.slice(0,12)
        }

        if( formatted.length !== 12 || formatted.charAt(0) !== "+" ) {
            input.style.borderColor = 'red';
        }

        //set new value
        input.value = formatted;
    });

    //postcode format for LT countries, only numbers
    var billing_postcode = document.getElementById('billing_postcode');
    billing_postcode.addEventListener('change', function () {
        if( isCountry("LT") ) {
            billing_postcode.value = billing_postcode.value.trim().replace(/([^0-9]+)/gi, '');
        }
    })

    //email fix, once in a while user buys with gmail.con, so convert it to gmail.com
    var billing_email = document.getElementById('billing_email');
    billing_email.addEventListener('change', function () {
        if( isCountry("LT") ) {
            billing_email.value = billing_email.value.trim().replace('gmail.con', 'gmail.com');
        }
    })

    function formatPhoneText(value){
        //convert 86 to +3706
        //convert + to +3706
        if( value.length < 3 && (value === "86" || value === "+") ) {
            value = "+3706"
        }

        return value.trim().replace(/([^+0-9]+)/gi, '');
    }