When trying to bind an object that is constantly changing, one-way binding may not effectively capture those dynamic modifications

For a detailed review of the code, please check out the plnkr.

I am quite new to AngularJS components. I have created two simple AngularJS components with the exact same bindings:

 bindings: { value:'@', field:'@', object: '<', callback: '&' }

In my components, I pass a JavaScript object using the object binding. The field parameter specifies the property name within the JS object, while value indicates the new value for that property.

object[field] = value

If the component doesn't clone the object in its controller, one-way binding does not function properly (refer to the onewaybindingfail component in the plnkr). However, cloning the object in the component's controller resolves this issue.

I would like to understand if this behavior is expected and why it occurs, or if I might be overlooking something.

Thank you for your assistance.

javascriptangularjsangular-directiveangular-components

Answer №1

The behavior described is completely normal. When using "<" to denote one-way binding in Angular, it indicates that Angular will not monitor changes on the component side. However, if you modify the object on the component side, the original object will still be affected. This concept is also discussed in the official Angular documentation here.

For this reason, it is best practice to create a copy of the object when working with it. It's recommended to use callback functions to make changes to the parent object instead. The official Angular documentation provides further explanation on this topic.

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