How to get the key stroke in TextFiled

[hapershield]

Hi,

In my application, i need to get the keystroke in a text field.
This is required for allowing only some characters in the text field.
How we can do this?
I used as below
var t =new Ext.form.TextField({

width:24,height:20,

listeners: {
render: function(c) {
c.getEl().on('keyup', onChange);
}
}
});
function onChange(e)
{


}

But i dont know how to get the stroked key?
Please let me know.

[tobinharris]

Do you want the keystroke so you can react to it and call a function?

If so, the KeyMap might help:

http://extjs.com/deploy/dev/docs/ (search for KeyMap)