Pattern for wrapping an Asynchronous JavaScript function to make it synchronous

Question

I\'m working with a JavaScript API where most of the functions are asynchronous. The API is the WebKit JavaScript Database API which is a binding to a subset of functionali

Answer 1

This doesn't actually implement synchronous operation of the db query, but this was my solution for easy management. Basically use the calling function as the callback function, and test for the results argument. If the function receives results, it parses them, if not, it sends itself as a callback to the query method.

 render: function(queryResults){
  if (typeof queryResults != 'undefined'){
   console.log('Query completed!');
   //do what you will with the results (check for query errors here)

  } else {
   console.log('Beginning query...');
   this.db.read(this.render); //db.read is my wrapper method for the sql db, and I'm sending this render method as the callback.
  }
 }