Internet Explorer和Firefox中的jQuery自动调整大小问题

Question

I am very new to jQuery and JS. Recently i have been assigned to a bug, in which textarea should resize on focus according to the text present into that textarea.
We have used $('textarea').autosize(); function in a JS file.
This works properly on recent FF versions and latest IEs (9+), but it's not working on IE 7 and FF 3.5.3

I found this , but didn't workout.

Answer 1

The easiest could be that on the focus event of the textarea , u could populate the current text of the textarea to another span which is hidden in the view and has the same text styles as the textarea.

Once this new span has the text, u can get its width and height and then assign these to the textarea. Since these are very primitive actions, they must work in IE7 and FF3