javascript - What portion of input field is occupied by the text? -


i trying make auto (height) increasing text field. need know when increase height of input field. need know if text has filled input field or not. there way ?

if can useful, quick solution textarea next one:

javascript:

function resizetext(){   var cont = document.getelementbyid("mytext");   while (cont.scrollheight == cont.clientheight)   cont.rows--;    while (cont.scrollheight > cont.clientheight)   cont.rows++; }

html: 

<textarea id="mytext" rows="1" cols="30" onkeypress="resizetext()"> write here text. </textarea>

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