4 Answers

• I'm afraid i need to ride on this question, because i have the same problem, somewhat.

  I have a tabgroup and each page has an XHR call. i need to refresh each page with a new XHR call somehow… focus event is not the solution. for some reason, 'focus' is fired 3 times everytime u click a tab. (probably why it's causing your app to crash)

• I am assuming you have a window or a view inside the TabControl? You might try moving you XHR code to the open event in another control?

  In My application, I use the open event for those kind of actions… dont know if it makes a difference or nt

• I'm having the same thing and could use help with it. In windows/checkout.js, I have just:

  Ti.include('../redux.js');
  var win = Titanium.UI.currentWindow;
  win.addEventListener('focus', MyApp.UI.Checkout.CartDisplay);
  

  and then MyApp.UI.Checkout looks something like the code below. It works sometimes, but occasionally (frequently, even) crashes the app.

  var CartTable;
  
  MyApp.UI.Checkout = {
    CartDisplay: function() {
  
      MyApp.API.Store.cartContents({
        callback: MyApp.UI.Checkout.CartView
      });
  
    },
  
    CartView: function() {
      var cart = JSON.parse( this.responseText );
      var win = Ti.UI.currentWindow;
  
      if ( CartTable ) {
          win.remove( CartTable );
      }
  
      var tableview = new TableView({
        id: 'CartWindowTableView'
      });
  
      var data = [];
  
      // build array of TableViewRow objects
  
      tableview.data = data;
      CartTable = tableview;
      Titanium.UI.currentWindow.add(tableview);
    }
  };
  
  MyApp.API.Store = {
    cartContents: function(args) { // returns cart contents
      var xhr_cart = Ti.Network.createHTTPClient();
      xhr_cart.open("POST",MyApp.config.api.url);
      xhr_cart.onload = args.callback;
      xhr_cart.send({
        app:    'cart',
        method: 'contents'
      });
    }
  };
  

  This code looks pretty solid to me, so if anyone knows a better pattern to keep the app from crashing, I would appreciate some feedback!

• I have the same issue. I'm doing a News Reader, so from the channels list the app must open a particular channel using xhr, but this work only the first time, if a use win.addEventListener to "focus" works… but is this the best solution?

  var win= Ti.UI.currentWindow;
  var data = [];
  var xhr = Ti.Network.createHTTPClient();
  var urlchannel="http://v2.0.news.tmg.s3.amazonaws.com/feeds/news.xml";
  
  win.addEventListener("focus", function(){
      urlchannel = Titanium.App.Properties.getString("url");
      xhr.open("GET",urlchannel);
      xhr.send();
     });
  xhr.onload = function()
  {....};