javascript - Textarea increase ++ one row on enter and keypress using .attr() update -


i have textarea on want increase height 1 row on every enter , on each time when text goes row wile typing. have 3 conditions, when displayed want number used rows , set rows height based on this:

one: var countrows = $("textarea").val().split(/\r|\r\n|\n/).length;

two: when keypress == 13 used

and three: when text goes row wile typing

till have achived not working :|

var countrows = $("textarea").val().split(/\r|\r\n|\n/).length;    var keynum = 13; //enter keynum  //for default state //not calculating  $("textarea").attr("rows", countrows + 1);  //for enter key  //not working $("textarea").on('keypress', keynum, function() {    $(this).attr("rows", countrows + 1);      // alert("jjj"); });  //for case whentext goes row wile typing

i want using .attr() , updating attribute "rows" when 1 more row added or removed.

from https://stackoverflow.com/a/10080841/4801673

$("textarea").keyup(function(e) {     while($(this).outerheight() < this.scrollheight + parsefloat($(this).css("bordertopwidth")) + parsefloat($(this).css("borderbottomwidth"))) {         $(this).height($(this).height()+1);     }; });

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