Add a redirect to SharePoint new item form with datasource in site pages

I have created a new SP2010 aspx page for users to create a new request. When they have filled in the form they should be a redirect to a “thank you” page.
I did this via SPD2010, creating a new page with a datasource to the “new” functionality of the request list.

So I got into following troubles:
– Page was created in Site Pages
– When a request is filled in, the page reloads
– When you add a ?Source, it doesn’t get picked up

So, there is a generic FireServerEvent that handles the action on the buttons where you can do something with. I couldn’t get a window.location through though.

Then a coworker came with a solution: ‘__redirect=(yoursite)’
So the code on the button looks like:

<input type="button" value="Save" name="btnSave" onclick="javascript: {ddwrt:GenFireServerEvent('__commit;__redirect={http://www.google.com}')}" />

There is also a way to do this in SharePoint Designer. When you click on the button, right click and choose form actions. There you can add actions to the button.
More info here