var validExpeMail = false
var validExpeLoc = false  //turned to true in geocoder.js
var validDestMail = false
var validDestLoc = false  //turned to true in geocoder.js

function validateEmail(email) {  //from https://stackoverflow.com/questions/46155/how-to-validate-an-email-address-in-javascript
    const re = /^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    return re.test(String(email).toLowerCase());
}

$("#expeMail").change(function() {
	validExpeMail = validateEmail($("#expeMail").val())
	checkFormValid()
})

$("#destMail").change(function() {
	validDestMail = validateEmail($("#destMail").val())
	checkFormValid()
})

document.querySelector('.custom-file-input').addEventListener('change',function(e){
	var fileName = document.getElementById("attachmentPlane").files[0].name;
	var nextSibling = e.target.nextElementSibling
	nextSibling.innerText = fileName
})

function checkFormValid(){
	if(validExpeMail && validExpeLoc && validDestMail && validDestLoc){
		$('#sendNewPlane').prop("disabled", false)
	}
}