html - readonly textarea to fit the content with angularjs -

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what easiest way make readonly textarea fit it's content (no scrollbar)? i'm using angularjs , want pure angualrjs, don't want use jquery.

angular.module("app", [])     .directive("autoheight", function () {     return {         restrict: "eac",         link: function (scope, element, attrs) {             element[0].style.height = (element[0].scrollheight < 30) ? 30 + "px" : element[0].scrollheight + "px";         }     }; });

in html:

<textarea auto-height> </textarea>

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