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“改变”的绑定在骨干模型中不起作用

发布于 2024-11-02 22:29:35 字数 194 浏览 0 评论 0原文

这是示例，

我正在遵循 Thomas Davis 的这篇优秀教程：什么是模型？不知何故，“更改”绑定没有触发。我在这里做错了什么？

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因为看清所以看轻 2024-11-09 22:29:35

Backbone 正在检查设置的值是否与之前的值相同（查看 https://github .com/documentcloud/backbone/blob/master/backbone.js#L210 等）。

在您的示例中，数组仍然相同，但内部的值发生了变化。这个问题很难解决。创建数组的新副本似乎是开销。我建议直接在您的采用函数中调用更改事件作为解决方案：

adopt: function(newChildsName){
  var children_array = this.get('children');
  children_array.push(newChildsName);
  this.set({children:children_array});
  this.trigger("change:children");
}

我建议在主干 github 存储库上创建一个问题，也许添加一个“强制”选项来强制更新（从而触发事件）属性模型。

Backbone is checking if the set value is the same as the previous value (look at https://github.com/documentcloud/backbone/blob/master/backbone.js#L210 and on).

In your example, the array is still the same but the value inside changed. This is tricky to solve. Creating a new copy of the array seems to be overhead. I would suggest to call the change event directly in your adopt function as a solution:

adopt: function(newChildsName){
  var children_array = this.get('children');
  children_array.push(newChildsName);
  this.set({children:children_array});
  this.trigger("change:children");
}

I would suggest to create an issue on backbone github repository to maybe add a "force" option to force the update (thus triggering the event) of attributes on a model.

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妄司 2024-11-09 22:29:35

这是一个有点尴尬的解决方案：

adopt: function(newChildsName){
  var children_array = this.get('children').splice(0);
  children_array.push(newChildsName);
  this.set({children:children_array});
}

Here is a bit awkward solution:

adopt: function(newChildsName){
  var children_array = this.get('children').splice(0);
  children_array.push(newChildsName);
  this.set({children:children_array});
}

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