Vue3 Responsive High-order Usage of triggerRef

In Vue3's responsive system, shallowRef provides a lightweight responsive state management method. However, when we need to operate on the inner properties of shallowRef, we encounter some limitations. Fortunately, Vue3 provides triggerRef() method to help us solve this problem. This article will introduce in detail the usage scenarios, basic usage, detailed functional explanations, best practices and cases of triggerRef().

1. Introduction

In Vue3, a responsive system is one of its core features.shallowRefis a lightweight responsive reference that only responsively tracks top-level properties without recursively making their internal properties responsive.triggerRef()The method allows us to force trigger the pair in certain situationsshallowRefResponse to inner-level attributes, thereby improving flexibility.

2. Use scenarios

2.1 When to use shallowRef

shallowRefApplicable to the following scenarios:

• Lightweight responsive references are required.
• Simply perform responsive tracking of top-level properties.
• Changes in internal properties do not require triggering responsive updates.

2.2 When to use triggerRef

triggerRefApplicable to the following scenarios:

• Need to be correctshallowRefThe inner-level properties of  operate and hope that these operations trigger responsive updates.
• In special cases, manual control of responsive updates is required.

3. Basic use

3.1 Definition shallowRef

import { shallowRef } from 'vue';

const state = shallowRef({
  nested: {
    value: 1
  }
});

3.2 Modify top-level properties

 = { nested: { value: 2 } }; // Responsive update

3.3 Modify inner properties

Directly modifying inner-level properties will not trigger responsive updates:

 = 3; // Responsive updates will not be triggered

3.4 Force update using triggerRef

import { triggerRef } from 'vue';

 = 3; // Modify inner propertiestriggerRef(state); // Force trigger responsive updates

4. Detailed explanation of functions

4.1 Features of shallowRef

shallowRefOnly top-level attributes are tracked responsively, and changes in internal attributes will not trigger responsive updates. This characteristic makesshallowRefMore lightweight and efficient, suitable for scenarios where deep responsive tracking is not required.

4.2 The role of triggerRef

triggerRefMethods are used to force trigger pairsshallowRefResponsive updates. By callingtriggerRef, we can manually control itshallowRefupdate behavior, so as to responsively track changes in internal properties when needed.

V. Best practices and cases

5.1 Use triggerRef to manage complex states

When managing complex states,shallowRefandtriggerRefIt can be used in combination to achieve efficient responsive state management.

import { shallowRef, triggerRef } from 'vue';

const state = shallowRef({
  user: {
    name: 'Alice',
    age: 25
  }
});

// Modify inner properties = 26;

// Force trigger responsive updatestriggerRef(state);

5.2 Avoid unnecessary responsive updates

In some cases, we may just need to update specific operations responsively. at this time,triggerRefIt can help us avoid unnecessary responsive updates and improve performance.

import { shallowRef, triggerRef } from 'vue';

const state = shallowRef({
  items: []
});

// Add new projectfunction addItem(item) {
  (item);
  triggerRef(state); // Trigger responsive updates only if needed}

6. Summary

triggerRef()It is a powerful tool in Vue3 that can be usedshallowRefProvides greater flexibility when  . Through reasonable usetriggerRef,We can manually control responsive updates when needed to balance performance and responsive tracing. I hope this article can help you better understand and apply ittriggerRef(), improve the development efficiency of Vue3 projects.

This is the end of this article about the use of triggerRef() in Vue3 responsive advanced usage. For more information about Vue3 triggerRef(), please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!