Hacking at 0300

I've put an Amazon Wishlist Widget for WordPress on my github site, that uses the techniques described before. You can see it running on the sidebar here.

I figured out how to get all the pages from screen-scraping the Amazon wish list. Basically, look for the "Next" button (it's in a <li class=a-last> element). If that element is present, look for the next page.

function getwishlistitems ($listID, $page=1){
	// ignore parsing warnings
	$wishlistdom = new DOMDocument();
	@$wishlistdom->loadHTMLFile("http://www.amazon.com/gp/registry/wishlist/$listID?disableNav=1&page=$page");
	$wishlistxpath = new DOMXPath ($wishlistdom);
	$items = iterator_to_array($wishlistxpath->query("//div[starts-with(@id,'item_')]"));
	if ($wishlistxpath->evaluate("count(//li[@class='a-last'])")) { // this is the "Next->" button
		$items = array_merge($items, $this->getwishlistitems($listID, $filter, $page+1));
	}
	return $items;
}

Note that this creates a complication: the array of items now includes nodes from different documents, so you can't use one saved DOMXPath. Instead, where the original code has $wishlistxpath->evaluate($xpath, $node), use

(new DOMXPath($node->ownerDocument))->evaluate($xpath, $node);

Hope this helps someone.