Created
October 1, 2024 11:13
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export class ClassObserver { | |
private readonly target: Element; | |
private readonly className: string; | |
private readonly onClassAdd: () => void; | |
private readonly onClassRemove: () => void; | |
private readonly observer: MutationObserver | null; | |
private hadClass: boolean; | |
constructor(target: Element, className: string, onClassAdd: () => void, onClassRemove: () => void) { | |
this.target = target; | |
this.className = className; | |
this.onClassAdd = onClassAdd; | |
this.onClassRemove = onClassRemove; | |
this.hadClass = target.classList.contains(this.className); | |
this.observer = new MutationObserver(this.mutationCallback); | |
this.observe(); | |
} | |
private mutationCallback = (mutations: MutationRecord[]): void => { | |
for (let m of mutations) { | |
if (m.type !== "attributes" || m.attributeName !== "class") continue; | |
let hasClass = (m.target as Element).classList.contains(this.className); | |
if (this.hadClass === hasClass) continue; | |
this.hadClass = hasClass; | |
hasClass ? this.onClassAdd() : this.onClassRemove(); | |
} | |
}; | |
public observe(): void { | |
if (this.observer) this.observer.observe(this.target, { attributes: true }); | |
} | |
public disconnect(): void { | |
if (this.observer) this.observer.disconnect(); | |
} | |
} |
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