How to use Mixin to implement form change listening between Vue parent and child components?

Detailed explanation of the Mixin form change monitoring mechanism between Vue parent and child components

This article discusses how to effectively use Mixin to listen for changes in child component form in parent components. Background: searchFormMemory Mixin is responsible for persisting (serialization and deserialization) of search forms. The parent component (data record list page) contains child component C (including search form and partially mixing searchFormMemory ). Core question: How to listen for form changes of child component C in searchFormMemory .

Listening to subcomponent forms directly in Mixin is not the best solution because Mixin does not directly manage subcomponent state. searchFormMemory is mixed in the parent component, so the listening logic should be in the parent component.

Solution: Leverage the mechanism of communication between parent and child components. Two methods:

1. Props and functions: The parent component passes a function to the child component through props. This function is called when the child component form value changes and passes the new value as a parameter to the parent component. The parent component handles persistence logic.

2. Custom Event: A custom event is triggered when the subcomponent form value changes. The parent component listens for the event and performs persistence operations in the event handler.

Both methods can achieve the goal, and the choice depends on the project code style and complexity. Key: Put the listening logic in the parent component, Mixin is only responsible for form persistence function, and parent-child component communication uses the Vue.js mechanism.

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