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function LoadResults(searchterm) { if (searchterm.length == 0) { // If the input box is empty, let's dump all the rows from the results table ClearResults(); HideDiv("searchresults"); return; } // Fetch results from server side. // This is our actual Ajax call Anthem_InvokePageMethod('RetrieveRows', [searchterm], LoadResultsCallback); } Every time a single user types a key, a hit is made to the database. This is not necessarily the best strategy for this style of global searching. However, there are a few things that you can do to optimize this process. First, don t search on the key-up event. I would recommend instead a JavaScript timeout that would periodically check the current textbox value to see whether it has changed since the previous search. If it has, then make the call to the database. This can drastically cut down on the amount of web server and database traffic. Finally, you should store the current search results to maintain a viable set of previous data in memory. Let s say the user types the film name Star Wars on the Spout site. As the user types, new search results are given for each iteration of the key entry, as shown in Figure 19-5.

'EntriesPerPage' =>100, # Return at most 100 entries. # Note that for performance reasons, # this code does not iterate through the pages,

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You don t have to be limited by the built-in tags and output formats. The authors of ocamldoc have created a system that enables you to create your own tags and output format in OCaml. You can just start adding them. When you run ocamldoc, it gives a warning if a tag is not handled by the selected generator, but it will continue, and you should just ignore it. (They will be included in the pretty printed source, though.) The easiest way to add your own custom tag is to inherit from one of the existing generators and add it. class cooltag = object(self) inherit Odoc_html.html (** this is where we define the member function to handle the cool tag. @cool Cool, eh *) method html_of_cool t = Printf.sprintf "<blink>Blink</blink>\n" initializer tag_functions <- ("cool", self#html_of_cool) :: tag_functions end let cooltag = new cooltag let _ = Odoc_args.set_doc_generator (Some (cooltag :> Odoc_args.doc_generator))

# so it will calculate the average of # only the first hundred items on eBay. 'PageNumber' =>1 }

The type-ahead functionality builds the search results as the user types, recommending possible matches for the current term. Each retrieval and modification of the results table, however, represents a unique trip to and from the database. And here s an interesting situation: what do we do if the user hits the Backspace key Do we make another trip to the

You can compile this code using ocamlc -I +ocamldoc -c cool.ml and then run it by using ocamldoc -g cool.cmo I +ocamldoc cool.ml. This enables you to see the cool tag. Don t pass the command any output flags; otherwise, it uses that flag instead of the custom generator. This generator adds the cool tag only to HTML output; if you want to do it for the other outputs, you have to subclass their output classes individually. More complete custom generators are not this simple in fact, they can be very complicated (and happen very rarely).

As you can see, this class has just one method, and the first thing you do is create a hash that represents the parameters you ll pass to eBay s web services. The most important parameter is CallName, which controls which of the various available functions you call. In this case, you call GetSearchResults, which returns the result of an eBay search, logically enough. A number of other function calls are available, and each can be used in a manner similar to this one. The second most important parameter is the Query parameter, which specifies the keywords to search by. However, you need to optionally search by seller as well, so the next chunk of code adds a second parameter if desired:

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