Limiting number of lines and letters in single line in textarea

Question

Problem:
I am trying to limit number of lines AND letters in each line in a textbox.

What i got so far:
So far i managed t

Answer 1

Tested in chrome : http://jsfiddle.net/3e3EH/1/

$(document).ready(function(){
    var textArea = $('#foo');
    var maxRows = textArea.attr('rows');
    var maxChars = textArea.attr('cols');
    textArea.keypress(function(e){
        var text = textArea.val();
        var lines = text.split('\n');
        if (e.keyCode == 13){
            return lines.length < maxRows;
        }
        else{
            var caret = textArea.get(0).selectionStart;
            console.log(caret);

            var line = 0;
            var charCount = 0;
            $.each(lines, function(i,e){
                charCount += e.length;
                if (caret <= charCount){
                    line = i;
                    return false;
                }
                //\n count for 1 char;
                charCount += 1;
            });

            var theLine = lines[line];
            return theLine.length < maxChars;
        }
    });

});​

Edit

As jbabey pointed out, ctrl+v or right-click -> paste can be an issue. right click can easily be prevented. for ctrl+v, you probable can detect it too... Just disabling javascript will obviously break the thing, too. Anyways, as any client-side validation, you have to double check on server-side.