Restrict "Enter, delete and backspace" in TextArea

Question

Hi,
     I want to restrict Delete key, Backspace key,  and Enter Key in TextArea. Please tell me how to restrict these 3 keys. Thanks in advance.
Regards,
Kameshwaran A

Answer 1

var origS:String = "Cuveiro: resteba o restreba 'la segunda cosecha que se coge en un mismo terreno'."
my_txt.text = origS;
listenerObject = new Object();
// If i press delete key, first  this listener is invoking
listenerObject.keyDown = function(eventObject) { 
    ci = Selection.getCaretIndex(); 
listenerObject.keyUp = function(eventObject) { 
    if(Key.getAscii()==13){
        my_txt.text=my_txt.text.split("\r").join("");
    } else if(Key.getAscii()==8 || Key.getAscii()==127){
        if(prevS){
            my_txt.text=prevS;
        } else {
            my_txt.text=origS
    prevS = my_txt.text;
    Selection.setFocus(my_txt);
    Selection.setSelection(ci,ci)
my_txt.addEventListener("keyDown",listenerObject);
my_txt.addEventListener("keyUp",listenerObject);