Top level Request error handler - Similar to $.ajaxError in JQuery Example with PHP exception print in JSON by the remote server.

gistfile1.js

/*
 * Top level Request error handler
 *  - Similar to $.ajaxError in JQuery
 */

Class.refactor(Request, {
  __refactor_default_onComplete : null,
  
  initialize : function(options) {
    
    var opt_clone = Object.clone(options);
    if (typeof opt_clone.onComplete != 'undefined') {
    this.__refactor_default_onComplete = opt_clone.onComplete;
    }
    
    options['onComplete'] = this.__refactor_custom_onComplete.bind(this);
    
    // for 40* HTTP errors custom handler at top level !
    options['onFailure'] = this.__refactor_showErrorBox.bind(this);
    
    this.previous(options);
  }, 
  
  __refactor_showErrorBox : function() {
    this.$events= {}; //clear the callback queue, the hard way
    
    // display error box here :)
  },
  
  __refactor_custom_onComplete : function() {
    //arguments[0] is the JSON object, arguments[1] the raw response
    if (typeof arguments[0] == "object") {
      
      //we got an PHP exception
      if (typeof arguments[0]['code'] != 'undefined' && typeof arguments[0]['exception'] != 'undefined' && typeof arguments[0]['type'] != 'undefined') {
        
        this.$events= {}; //clear the callback queue, the hard way
        
        if (arguments[0]['code'] == 403) { //this code is an example, depends on server config
          window.location = 'login.php';
        } else {
          this.__refactor_showErrorBox();
        }
        
      }
      
    } else {
      if (this.__refactor_default_onComplete) {
        this.__refactor_default_onComplete.call(this.__refactor_default_onComplete);
      }
    }
    
  }
});