window.onload = function () {
	let btn = document.getElementById('sendBtn');
	btn.addEventListener('click', function () {
		let name = document.getElementById('name');
		let email = document.getElementById('email');
		let phone = document.getElementById('phone');
		let text = document.getElementById('text');
		name.style.border = "1px solid #d4d1d1";
		email.style.border = "1px solid #d4d1d1";
		phone.style.border = "1px solid #d4d1d1";

		//проверяем text
		if (text.value == '' ){
			alert("Enter text in the message form!");
		};
		//проверяем name
		if (/[a-zA-Z]/g.test(name.value) == true){
			return true;
		}else if(name.value == ''){
			alert("Enter data in the name form!");
		}else{
			// name.style.border = "2px solid red";
			alert("There should be only letters in the name form!");
		};
		//проверяем email
		if (/(([a-zA-Z]+)|([a-zA-Z]+\.[a-zA-Z]+)|([a-zA-Z]+\-[a-zA-Z]+))\@[a-z]+\.[a-z]+/.test(email.value) == true){
			return true;
		}else if(email.value == ''){
			alert("Enter data in the email form!");
		}else{
			// email.style.border = "2px solid red";
			alert("Your email should be entered in the following form template: mymail@mail.ru or my.mail@mail.ru or my-mail@mail.ru");
		};
		//проверяем phone
		if (/\+[0-9]\([0-9]{3}\)[0-9]{3}\-[0-9]{2}\-[0-9]{2}/.test(phone.value) == true){
			return true;
		}else if(phone.value == ''){
			alert("Enter data in the phone form!");
		}else{
			// phone.style.border = "2px solid red";
			alert("Your phone should be entered in the following form template: +7(000)000-00-00");
		};
	});
}