Switching allowBlank based on selections

[jimtyp]

I have a form and a bunch of fields. Based on values entered, I'd like to change the allowBlank on some fields from true to false. Is this possible?

[Animal]

Yes, just change it.

[jimtyp]

When I do this it doesn't work:

var obj = Ext.getCmp('accessCard');
obj.allowBlank = false;

Initially the allowBlank is true for this field, but after a combo is selected I do the above code and was hoping the "submit" button would change to disabled, but it still shows enabled.

[jimtyp]

Never mind, it does work, i had a typo, sorry about that. Thanks for your help!