WoW:API SortAuctionItems

Sorts the auction house display.

SortAuctionItems("type", "sort");

type

One of the following:

"list": An item up for auction, the "Browse" tab in the dialog.
"bidder": An item the player has bid on, the "Bids" tab in the dialog.
"owner": An item the player has up for auction, the "Auctions" tab in the dialog.

sort

One of the following:

"quality": The rarity of the item.
"level": The minimum required level (if any). Only applies to "Browse" and "Bids" tabs.
"status": On the "Browse" tab, this is the "Seller" column. On the "Bids" tab it is the "Bid Status" column. On the "Auctions" tab it is the "High Bidder" column.
"duration": The amount of time left in the auction
"bid": An item the player has up for auction, the "Auctions" tab in the dialog.
"name": The name of the item. Only applies to "Browse" and "Bids" tabs. This is normally not shown as a separate sortable column (but is enabled with the AuctionSort adddon).
"buyout": An item the player has up for auction, the "Auctions" tab in the dialog. This is normally not shown as a separate sortable column (but is enabled with the AuctionSort adddon).

SortAuctionItems("list", "bid");

The results on the "Browse" tab are sorted by bid.

There is no way to specifically set the direction of the sort. It reverses the previous direction. See also: IsAuctionSortReversed(type, sort)