ng-click 中的一种数据绑定方式 [英] One way data binding inside ng-click

问题描述

我的控制器中有两个 $scope 数组.

I have two $scope array inside my controller.

$scope.arrayA= [false, false, false, false, false, false];
$scope.arrayB= [false, false, false, false, false, false];

arrayA 会随着复选框的点击而改变.这部分我已经完成了.

arrayA will change depends on checkbox click. I have done this part.

arrayB 只会在点击按钮时将值更改为等于 arrayA.

arrayB will change values to be equal to arrayA only when a button is clicked.

<button type="button" ng-click="arrayB = arrayA" class="btn btn-search">Get Data</button> 

问题是一旦点击按钮，就实现了双向数据绑定.每次 arrayA 更改时，arrayB 都会更改.

The problem is once the button is clicked, two way data binding is implemented. arrayB will change everytime arrayA changes.

我只想在单击按钮时更改 arrayB.有没有办法在 ng-click 中使用角度单向数据绑定 @ ?你知道我们如何在 python 中将变量值传递为 varB = varA.

I only want arrayB to change when the button is clicked. Is there a way to use the angular one-way data binding @ inside ng-click? You know like how we pass variables values in python as varB = varA.

推荐答案

不是将 arrayA 直接赋值给 arrayB，而是需要创建它的副本，以便两个变量不指向同一个对象.

Instead of assigning arrayA directly to arrayB, you need to create a copy of it, so that both variables don't refer to the same object.

arrayA = arrayB

上面的赋值只是让 arrayA 和 arrayB 指向同一个对象.点击按钮，你可以试试这个:

The above assignment simply makes arrayA and arrayB to refer to the same object. On click of the button, you may try this:

arrayB = arrayA.map(item => item);

这将确保创建数组的新副本，并且由于 varA 包含的值是原始值(布尔值)，因此不会发生冲突.

This will ensure that a new copy of the array is created, and since the values varA contains are primitive (boolean), there will be no conflicts.

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