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Editorial Team
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Asked: 2026-05-25T10:41:08+00:00

I get Cannot call ‘start’ of undefined when calling… Backbone.history.start() When running some checks

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I get Cannot call 'start' of undefined when calling…

    Backbone.history.start()

When running some checks Backbone returns the object but Backbone.history returns undefined.

What could be the cause of this?

Thanks

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1 Answer

  1. Editorial Team

    Do you have any routes on the controller? Backbone only creates the history once at least one route is specified.

    More:

    TypeError: Cannot call method ‘start’ of undefined**

    Hmm, for some reason Backbone.history is undefined, and so there is no
    start method on it. It turns out that Backbone.js creates an instance
    of Backbone.History (upper case ‘H’) called Backbone.history (lower
    case ‘h’) once a controller has been created that has at least one
    route specified on it. This makes sense, as history management is only
    required if there are routes to respond to.

    http://tinnedfruit.com/2011/04/26/testing-backbone-apps-with-jasmine-sinon-3.html

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