How to properly break out of a promise chain?

by

Sounds like you want to branch, not to break – you want to continue as usual to the done. A nice property of promises is that they don’t only chain, but also can be nested and unnested without restrictions. In your case, you can just put the part of the chain that you want to “break” away inside your if-statement:

Menus.getCantinas().then(function(cantinas) {
    Menus.cantinas = cantinas;

    if (cantinas.length == 0)
        return Menus; // break!

    // else
    return $.when(Menus.getMeals(cantinas), Menus.getSides(cantinas))
    .then(function(meals, sides) {
        Menus.sides = sides;
        Menus.meals = meals;
        return Menus.getAdditives(meals, sides);
    }).then(function(additives) {
        Menus.additives = additives;
        return Menus;
    });
}).done(function(Menus) {
    // with no cantinas, or with everything
});

More Related Contents:

  1. jQuery deferreds and promises – .then() vs .done()
  2. How to break out of jQuery each loop?
  3. Problems inherent to jQuery $.Deferred (jQuery 1.x/2.x)
  4. jQuery: execute array of functions sequentially (both deferreds and non-deferreds)
  5. How to show loading spinner in jQuery?
  6. Why should I use Google’s CDN for jQuery?
  7. JavaScript console.log causes error: “Synchronous XMLHttpRequest on the main thread is deprecated…”
  8. jQuery: Best practice to populate drop down?
  9. How to load an external webpage into a div of a html page
  10. Selecting HTML comments with jQuery
  11. CSS rotation cross browser with jquery.animate()
  12. How to get screen width without (minus) scrollbar?
  13. Revert a jQuery draggable object back to its original container on out event of droppable
  14. Cannot modify content of iframe, what is wrong?
  15. How can I count the number of children?
  16. How to show/hide an element on checkbox checked/unchecked states using jQuery?
  17. jQuery: Check if image exists
  18. How can I get the corresponding table header (th) from a table cell (td)?
  19. jQuery Set Mouse Position (not cursor position)
  20. Jquery resizing image
  21. jQuery if div contains this text, replace that part of the text
  22. jQuery UI Dialog Button Icons
  23. Calling function after .load (Jquery)
  24. Set the selected index of a Dropdown using jQuery
  25. How can I disable a button on a jQuery UI dialog?
  26. jQuery, checkboxes and .is(“:checked”)
  27. Twitter Bootstrap add active class to li
  28. Ajax post serialize() does not include button name and value
  29. jQuery autohide element after 5 seconds
  30. How do I select the parent form based on which submit button is clicked?

Leave a Comment