js window selection get new line
var userSelection function countLineBreaks(){ //Textarea var textarea = document.getElementById("textArea"); //Get user selection userSelection = (textarea.value).substring(textarea.selectionStart,textarea.selectionEnd); //Simple regex to check for line break var matches = userSelection.match(/\n/g); //Count line breaks var lineBreaksCount = matches ? matches.length : 0 console.log(lineBreaksCount + ' Line breaks') }