Answers for "textarea autoheight"

make textarea auto height

function autoResize() {
	console.log('resizing');
	textInput.style.height = (textInput.scrollHeight) + 'px';
}

html textarea auto height to amount of text

$('textarea').each(function () {
  this.setAttribute('style', 'height:' + (this.scrollHeight) + 'px;overflow-y:hidden;');
}).on('input', function () {
  this.style.height = 'auto';
  this.style.height = (this.scrollHeight) + 'px';
});