What does google.setOnLoadCallback(initialize) function exactly mean?

While coding JavaScript and Ajax, there is no proper documentation for this function. I searched this term 开发者_如何转开发using api src="http://www.google.com/jsapi" and searchControl.execute("abhilashm86");.

How is this google.setOnLoadCallback(initialize) called internally? Is this function just for a new search term when the user clears previous search and starts a new one? How exactly does google.setOnLoadCallback(initialize) get trigerred?

Your initialize function will be called when your document (including the Google API) is fully loaded. So you should wrap any code that uses the API in the function you pass in:

E.g.

google.setOnLoadCallback(function()
{
   var searcher = new google.search.SearchControl();
   // More code that depends on the API.
});

The documentation says:

Use google.setOnLoadCallback to register the specified handler function to be called once the document loads instead of GSearch.setOnLoadCallback.