Question

I was wondering if it is possible to bind multiple event types in backbone within a single line.

Consider the following:

var MyView = Backbone.View.extend({
    id: 'foo',
    events: {
        'click .bar': 'doSomething',
        'touchstart .bar': 'doSomething'
    },
    doSomething: function(e) {
        console.log(e.type);
    }
});

Basically what I am wondering is if it is possible to combine the event binding for ‘click’ and ‘touchstart’ into one line – along the lines of:

events: { 'click,touchstart .bar': 'doSomething' }

Any suggestions would be appreciated.

Answer 1

For anyone interested I ended up overriding delegateEvents in Backbone.View.

There are only a few modified lines to get the desired functionality.

You can see a diff in my commit on github

Here is delegateEvents in its modified state:

delegateEvents: function(events) {
    if (!(events || (events = getValue(this, 'events')))) return;
    this.undelegateEvents();
    for (var key in events) {
        var method = events[key];
        if (!_.isFunction(method)) method = this[events[key]];
        if (!method) throw new Error('Method "' + events[key] + '" does not exist');
        var match = key.match(delegateEventSplitter);
        var eventTypes = match[1].split(','), selector = match[2];
        method = _.bind(method, this);
        var self = this;
        _(eventTypes).each(function(eventName) {
            eventName += '.delegateEvents' + self.cid;
            if (selector === '') {
              self.$el.bind(eventName, method);
            } else {
                self.$el.delegate(selector, eventName, method);
            }
        });
    }
}