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As and when the user scrolls the page ...
Is this correct English?
The context is: A person is describing scrolling on the web page.
Not sure if the "As and" part is correct or it adds any extra meaning to the sentence. Instead of saying "As and when" one could say "when the user scrolls the page..." will it mean the same thing?
The most common context for the collocation as and when X is in "imperative" statements and similar (giving advice / permission / ...) where X defines the conditions when the advice / permission applies...
Note that most of the above matches will be in imperative contexts like Take one of these pain killer tablets as and when required. The construction is less common in contexts like OP's (as and when an action is being performed), but it's still perfectly natural to this native speaker.
The difference between using both terms (when either on its own should be sufficient) is simply a nuance of emphasis. You can understand as and when as carrying the sense of every time, whenever.
