HandleResumeForm.js

const handleResumeForm = (inputTargetId)=>{
	const RESUME_INPUT = document.getElementById(inputTargetId);
	const RESUME_FILE_NAME = RESUME_INPUT.value;
	const ALLOWED_EXTENSIONS = ['pdf','doc','docx'];
	const ERROR_CLASS = 'form-error';

	const inArray = (array, key)=>{
		let result = false;
		array.forEach((item)=>{ item === key ? result = true : '' })
		return result;
	}

	const throwError = ()=>{
		RESUME_INPUT.classList.add(ERROR_CLASS);
		return false;
	}

	const proceed = ()=>{
		console.log('SENDING MESSAGE...');
		RESUME_INPUT.classList.remove(ERROR_CLASS);
		new SendAMessage('<?=$actionUrl;?>', '<?=$idiom;?>');
	}

	if (RESUME_FILE_NAME==='') return throwError();

	if (RESUME_FILE_NAME.indexOf('.')!==-1) {
		let extension = RESUME_FILE_NAME.split('.').slice(-1)[0];
		!inArray(ALLOWED_EXTENSIONS, extension) ? throwError() : proceed();
	}
}