Extjs : How to ‘real’ clear a cookie

If you are in extjs application designing and coding, you might need to use use ‘Ext.util.Cookies.*’ function.
You can :

• Ext.util.Cookies.get(‘my_cookie’) : get cookie value
• Ext.util.Cookies.get(‘my_cookie’, ‘cookie_value’) : set cookie value
• Ext.util.Cookies.clear(‘my_cookie’) : clear cookie

In theory you can delete cookie by means of ‘clear’ function.

In practice, you should use :

Ext.util.Cookies.set('my_cookie', null, new Date("January 1, 1970"));
Ext.util.Cookies.clear('my_cookie');

Because you can be faced to a problem where you cannot delete your cookie and cannot understand why…