pre-onComplete handler for all Ajax requests

xAjaxRequest.js

xAjaxRequest = Class.create({
	
	initialize: function (url, options) {
		
		//if the request has a callback, wrap that in our own callback
		
		if (typeof options.onComplete == "function") {
			
			var f = options.onComplete;
			options.onComplete = 
					function(r) {
						if (this.preOnComplete(r)) {
							f(r);
						}	
					}.bind(this);
		}
		new Ajax.Request(url, options);
	},
	
	preOnComplete: function(r) {
		console.log("I fire before all onComplete callbacks");
		
		return true; //or return false to prevent callback from going ahead
	}
});