Backbone history and IE9

This bit me the other day, so I thought I’d share the pain.

IE9 doesn’t support pushState as you probably know which meant everything was routing to root (as it were).

The following snippet checks and resorts to hash based routing if it can’t cut the mustard:

app.on('initialize:after', function() {
    if(Backbone.history && !Backbone.History.started) {
        if(!(window.history && history.pushState)) {
            Backbone.history.start({ pushState: false, silent: true });
            var fragment = window.location.pathname.substr(
                Backbone.history.options.root.length);
            Backbone.history.navigate(fragment, { trigger: true });
        }
        else {
            Backbone.history.start({ pushState: true });
        }
    }
});

Add it wherever you would initialize Backbone history – often the entry point of the app. Mine for instance has an app.js that is initialised by main.js

About us: Isotoma is a bespoke software development company based in York and London specialising in web apps, mobile apps and product design. If you’d like to know more you can review our work or get in touch.