无法更改数组中对象的属性 [英] cannot changed the property of an object inside an array

问题描述

有一个父元素。其属性之一是一系列对象。这个数组在ready函数中初始化。这个数组的显示被传递给一个子元素。我想做的是每当更改乘数属性时更新数组中每个元素的数量。我尝试使用文档中描述的重写脏检查技术，但无法使其正常工作。我会感谢一些指导。
[plunker link] [1]

There is a parent element. One of its property is an array of objects. This array is initialised in the ready function. The display of this array is handed down to a child element. What I want to do is to update the quantity of each element in the array whenever the multiplier property changed. I tried to use the override dirty checking technique described in the docs but couldn't get it to work. I would appreciate some guidance. [plunker link][1]

[1]: http://plnkr.co/edit/pCZyUC7YtgUU8cpejNpj?p=info

推荐答案

这里是工作示例： Plunk

很少的东西被纠正一个是这样的：

Few things are corrected, one is this:

//DO not use 'this.setItems.0.quantity.value', but:
         this.set('setItems.0.quantity.value', newQuantity);
   console.log("New arr val: ");
   console.log(this.setItems[0].quantity.value);

文档：

https://www.polymer-project.org/1.0/docs/devguide/model-数据

https://www.polymer-project.org/1.0/docs/devguide/data-binding#array-binding

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