Backbone - Is it possible to bind a change event to a model, except for one property?

Question

I would like a change event to fire anytime I change any property of the model, except for one. Is this possible? Besides doing:

model.bind('change:prop1', func);
model.bind('change:prop2', func);
model.bind('change:prop3', func);
etc....

Or alternatively, is there a way to find out which property triggered the change from within the event handler?

Answer 1

You could use model.bind('change',function() {/*...*/}) and in the function use hasChanged to check the attributes: if(model.hasChanged('propIWantToExclude')) return;

Answer 2

Justin's answer above will return when 'propIWantToExclude' and some other attributes are changed together. You probably don't want to do that, so you should also look at the size of model.changedAttributes:

if(model.changedAttributes.length == 1 && model.hasChanged('attrIWantToExclude')) {
    return;
}

Answer 3

Responding to David Tuite's request to answer the first part of the question, you could set up a function to respond to the "changed" event and then trigger a custom event if the property that you want to ignore was not changed.

This logic would trigger the custom event: 'somePropertyOtherThanThePropIWantToExcludeChanged' if the property was not changed. If multiple properties were changed, including the one you want to ignore, then the custom event would also NOT fire:

model.bind('change', function(){
    if( !model.hasChanged('propIWantToExclude') ){
        model.trigger('somePropertyOtherThanThePropIWantToExcludeChanged');
    }
});