javascript / expert
Snippet
Element State Management via Reactive WeakMap Storage
WeakMap uses objects as garbage-collectable keys. Combining a WeakMap data type with Vue's customRef allows associating reactive metadata with DOM elements without memory leaks.
snippet.js
javascript
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
import { customRef } from 'vue';const elementMeta = new WeakMap();export function useElementMetadata(targetEl) {if (!elementMeta.has(targetEl)) {elementMeta.set(targetEl, { clickCount: 0 });}return customRef((track, trigger) => ({get() {track();return elementMeta.get(targetEl);},set(newValue) {elementMeta.set(targetEl, newValue);trigger();}}));}
vue
Breakdown
1
const elementMeta = new WeakMap();
Instantiates a WeakMap data type where keys are held weakly, preventing memory leaks when elements are unmounted.
2
return customRef((track, trigger) => ({
Creates an explicit reactive reference by controlling track and trigger signals manually.
3
return elementMeta.get(targetEl);
Retrieves the target metadata object associated with the specific DOM element key.