Event to check quote for product on every page

Question

I am programmatically adding a product to cart if a certain coupon code is applied to cart.

I would like to check this on every page so that the product only shows up when the coupon is applied and no issues with cookies, etc.

What event can I observe for this?

Answer 1

you can use controller_action_predispatch.
This event is dispatched for every page, before the action is executed.

Answer 2

In order to add an observer to an event on every page add this in config.xml of your module.

<events>
    <controller_action_predispatch>
        <observers>
            <Namespace_ModuleName>
                <class>Namespace_ModuleName/observer</class>
                <method>Observer_action_name</method>
            </Namespace_ModuleName>
        </observers>
    </controller_action_predispatch>
</events>