Ways to prevent prop changes from passing up the chain?

After some experimentation, I discovered that the props I passed to a component can actually be changed within the component and affect the parent. This behavior is discussed in the official documentation.

While objects and arrays cannot be directly modified by child components when passed as props, they are still able to mutate the nested properties of these objects or arrays.

I was able to reproduce this scenario using the Vue Playground. The example demonstrates how modifying the prop in the child component affects the value in the parent component.

The issue arises when trying to break this binding between parent and child components. I attempted to use individual refs within the component from the props object, but it did not sever the connection, as demonstrated in the sample code.

What is the proper method to isolate a component from its parent in Vue?

It is worth noting that the variables in the component need to remain reactive for template usage and real-time modifications, as discussed in another related question; however, no solution has been provided for cases involving objects with nested Arrays like in my scenario.

Answer №1

I successfully severed the reactivity connection by deconstructing the props and assigning them to the component's reactive variable. In the code snippet showcased in the Vue Playground, this involves replacing

const books = ref([...props.data.Books])
// was: const books = ref(props.data.Books)

After this modification, books becomes reactive within the component and retains the values of the props, but any changes made to it do not affect the parent component.

Answer №2

Initially, the purpose of your inquiry is not entirely clear to me. Upon reviewing your code in the playground, it appears that you may be interested in utilizing the writable-computed feature.

The line

const name = ref(props.data.Name)
simply creates a new reference with props.data.Name as its default value, which means it will not automatically update when props change.

In relation to your question:

What is the correct approach to truly seal a component?

I believe modifying a prop's property directly is not advisable, even though Vue allows it. A better practice would involve updating the value using an event. Additionally, consider utilizing v-model as both a prop and an event by transforming v-model:visible="xxx" into :visible="xxx" and @update:visible="xxx"

You could create a reference within your component to monitor the props. When the reference changes, trigger an event to communicate with the parent component, and update the reference whenever the prop changes. Alternatively, you can explore the functionality offered by useVModel in @vue/use, where a similar mechanism is already implemented. I recommend trying it out and examining their codebase.

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