Registered Page Handlers

This function is used when there is a form that needs to have text entered into it and a button needs to be clicked.

In the RegisteredPageHandler, the "formExists" text stays constant across Addons.
The second value below, "f", is the name of the form on the webpage.
If a form with the name "f" exists on the page, it will run a function with the name of the third value.
The forth value tells the Addon that this is not a critical operation and will not crash if it is incomplete.

The handlers are set prior to navigating to the page:

function Search()
	AddonNameForm.Browser:RegisterPageHandler("formExists", "f", "GoogleLoaded", false);
	AddonNameForm.Browser:Navigate("http://books.google.com/advanced_book_search");	
end

For the SetFormValue, there are three pieces of information that must be included.
The first value is the "form name".
The second value is the "input id".
The third value is the information that will be placed in the form.

After the information is placed in the form, browser:ClickObject("btnG") is called.
"btnG" is the name of the input with the type "submit" for the clickable button.
This line makes it so the form is automatically submitted after the information is entered into the form.

function GoogleLoaded()
   if GetFieldValue("Transaction", "ISSN") ~= "" then
	AddonNameForm.Browser:SetFormValue("f", "as_isbn", GetFieldValue("Transaction", "ISSN"));
	AddonNameForm.Browser:SetFormValue("f", "as_brr", "1");
   else 
	AddonNameForm.Browser:SetFormValue("f", "as_epq", GetFieldValue("Transaction", "LoanTitle"));
	AddonNameForm.Browser:SetFormValue("f", "as_brr", "1");
   end
 	AddonNameForm.Browser:ClickObject("btnG");
end