Move Caret to End of Input or Textarea

focus.js

var focus = function(input) {
	if (typeof input.selectionStart === "number") {
                input.selectionStart = input.selectionEnd = input.value.length;
    	} else if (typeof input.createTextRange !== "undefined") {
                input.focus();
                var range = input.createTextRange();
                range.collapse(false);
                range.select();
    	}
};