Pointy

Function.prototype.beforeConstruction = function(newFunc) {
  var oldObj = this;
  var rv = function() {
    newFunc.apply(this, arguments);
    oldObj.apply(this, arguments);
  };
  rv.prototype = oldObj.prototype;
  return rv;
};

Pointy

<!-- 

  This is the template source for the page containing a "select". In doT
  templates the data object is by convention called "it" (though it can
  be set to be anything).  In this example, I'm inventing a field called
  "choice", whose value would presumably have come from the server via
  JSON (or whatever) as the property "choice" of the "it" parameter.

  In the option elements you'll see the doT construct to fetch a value
  from the "it" object, and you'll see that it involves what looks like