Setting the value of a textarea moves the cursor to the end. So you just need to save the value, clear it, focus it, and re-apply the value and you’re good.
$("button").on("click", function() { // cache textarea as we need it more than once var textarea = $("textarea"), // save old value as we need to clear it val = textarea.val(); // focus textarea, clear value, re-apply textarea .focus() .val("") .val(val); });This demo does that but also applies a little bit of UX. If the textarea’s current value doesn’t end in a space, add one. Just so you can click-and-keep-typing as you might.
You could make it a plugin as well:
$.fn.focusToEnd = function() { return this.each(function() { var v = $(this).val(); $(this).focus().val("").val(v); }); };