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7923181
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2011-10-27T22:25:33.833
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2011-10-27T22:51:00.707
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I haven't tested this, but I'm pretty sure that all events on all models in a collection will be passed to and triggered by the collection as well. So you should be able to listen to the <code>error</code> event on the collection: <pre><code>var cars = new Cars(); cars.bind('error', function() { console.log('Model not valid!') }) cars.add({'weight': -5}); </code></pre> Edit: Nope, this works for setting properties on existing models, but not on model creation. Ugh - it looks like there's no way to listen for this without overriding some part of the Backbone code. Models don't perform validation when they're initialized: <pre><code>var car = new Car({weight: -5}); console.log(car.get('weight')); // no error, logs -5 </code></pre> And while <code>collection.add()</code> does perform validation, it fails silently. If you use <code>collection.create()</code> instead of <code>collection.add()</code>, you can check, since <code>.create()</code> will return <code>false</code> on failure. But this will try to create the model on the server, which might not be what you want. So, I think the only way to do this is to override <code>collection._prepareModel</code> and trigger a custom event, like this: <pre><code>Cars = Backbone.Collection.extend({ model: Car, _prepareModel: function(model, options) { model = Backbone.Collection.prototype._prepareModel.call(this, model, options); if (!model) this.trigger('error:validation'); return model; } }); var cars = new Cars(); cars.bind('error:validation', function() { console.log('Model not valid!') }); cars.add({'weight': -5}); // logs: 'Model not valid!' </code></pre> Example here: <a href="http://jsfiddle.net/nrabinowitz/f44qk/1/" rel="nofollow">http://jsfiddle.net/nrabinowitz/f44qk/1/</a>
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1. POHow can I capture validation errors in a new Backbone.Model during instantiation?
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1. USnrabinowitz
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