How to load a js file on magento admin dashboard - magento

Question

I am trying to load a js file through XML on the dashboard page of magento admin, but am unable to get it right.
Here is the part of code that I have added in my config file:
<config>
<adminhtml>
<layout>
<updates>
<anattadesign_abandonedcarts>
<file>my_extension.xml</file>
</anattadesign_abandonedcarts>
</updates>
</layout>
</adminhtml>
</config>
And my contents of my_extension.xml which is placed under /app/design/adminhtml/default/default/layout/ is:
<layout>
<default>
<reference name="head">
<action method="addJs"><script>my_extension/adminhack.js</script></action>
<action method="addJs"><script>prototype/prototype.js</script></action>
</reference>
</default>
</layout>
I understand that I am trying to load a js file for the whole admin this way, but I would like to know both, loading on a certain page, and how to find out the name if I want to load it on a certain page and if default is the correct one to make it load on all admin pages.

Answer 1

Using default should load it on all pages, indeed.
To load it on just admin dashboard use the (full 3 element) route with underscores as separators to the page. For the dashboard this is Adminhtml/(controllers)/Dashboard(Controller)/index(Action).
<layout>
<adminhtml_dashboard_index>
<reference name="head">
<action method="addJs"><script>my_extension/adminhack.js</script></action>
<action method="addJs"><script>prototype/prototype.js</script></action>
</reference>
</adminhtml_dashboard_index>
</layout>
N.B. I have not tested this code, but I think it should do it.