Highway. Is it possible to associate a change event with a model, with the exception of one property?

Question

I want the change event to fire at any time when I change any property of the model except one. Is it possible? Besides:

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 caused the change from the event handler?

thanks

Answer 1

You can 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 this, 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 Tuit’s request to answer the first part of the question, you can configure the function to respond to a “modified” event, and then trigger a custom event if the property that you want to ignore has not been changed.

This logic will trigger a custom event: 'somePropertyOtherThanThePropIWantToExcludeChanged' if the property has not been changed. If several properties have been changed, including the one you want to ignore, then the custom event will NOT fire either:

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