Auto update shopping cart

Currently, the shopping cart shows the following:

If a customer changes the quantity, then they ALSO have to push the update button to get the updated price; if they forget, or press [back to shopping] or [go to checkout] the changes are lost.

What I want to achieve is that if the customer changes the quantity, that the price is updated automatically; either upon typing a number, upon hitting the [enter] key or the [tab] key.

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Anyone can help me with this?

You should already be able to type a new quantity and hit enter to update the quantity ...

Let's say I have 3 Products in the shopping cart with quantity 1 ...

I then change the quantities to to 2, 5, 3 and hit enter ... the product quantities should update all 3 of the products when I hit enter from any of the quantity fields ...

jewelsnpearls:

...
What I want to achieve is that if the customer changes the quantity, that the price is updated automatically; either upon typing a number, upon hitting the [enter] key or the [tab] key.

You will have to hit enter to make it go back to the server. It doesn't update in Javascript in the user's browser; you need to do a new pageload.