Backbone - 是否可以将更改事件绑定到模型（除了一个属性之外）？

发布于 2024-12-15 05:29:16 字数 222 浏览 0 评论 0原文

我希望每当我更改模型的任何属性（除了一个属性）时都会触发更改事件。这可能吗？除此之外：

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

或者，有没有办法找出事件处理程序中哪个属性触发了更改？

原文

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?

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物价感观 2024-12-22 05:29:16

您可以使用 model.bind('change',function() {/*...*/}) 并在函数中使用 hasChanged 检查属性：if(model.hasChanged('propIWantToExclude')) return;

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自演自醉 2024-12-22 05:29:16

当“propIWantToExclude”和其他一些属性一起更改时，贾斯汀的上述答案将返回。您可能不想这样做，因此您还应该查看 model.changedAttributes 的大小：

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

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;
}

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放手` 2024-12-22 05:29:16

响应 David Tuite 回答问题第一部分的请求，您可以设置一个函数来响应“已更改”事件，然后在您要忽略的属性未更改时触发自定义事件。

如果属性未更改，此逻辑将触发自定义事件：'somePropertyOtherThanThePropIWantToExcludeChanged'。如果更改了多个属性（包括您想要忽略的属性），则自定义事件也不会触发：

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

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');
    }
});

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