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ngx-mutation-observer

v1.6.0

Published

Angular 19.x library to monitor changes to elements. Uses MutationObserver to do the work.

Downloads

30

Readme

NgxMutationObserver

Angular 19.x library to monitor changes to elements. Uses MutationObserver to do the work.

If you're only looking for a way to see if elements are visible, I suggest checking out ngx-visibility instead. This doesn't notice everything - for instance, an element whose width is set to "50%" will not report a mutation when the window is resized or when a scrollbar is visible. Instead, a mutation is reported when the width is changed from "50%" to "75%" or to "128px".

If you only care about when elements are resized, including resize events due to browser window size changing, look at ngx-resize-observer.

Demonstration

There's a live demo over at CodeSandbox.io.

Installation

Install like other Angular libraries. First run a command to download the module.

npm install ngx-mutation-observer

Next, add the module to your project.

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';

// Import the module
import { NgxMutationObserverModule } from 'ngx-mutation-observer';

import { AppComponent } from './app.component';

@NgModule({
    declarations: [AppComponent, ItemComponent],

    // Include the module.
    imports: [BrowserModule, FormsModule, NgxMutationObserverModule],
    providers: [],
    bootstrap: [AppComponent]
})
export class AppModule {}

Finally, you leverage the service directly or use some directives for common uses.

NgxMutationObserverDirective

Emits MutationRecord[] when a mutation is detected.

<div (onMutation)="handleMutation($event)"></div>

Configuration is allowed through the mutationConfig directive. When not specified, this defaults to {attributes: true, characterData: true, childList: true }. You are allowed to specify anything allowed in the interface. For instance, if you only care about the size of an element changing, you would only watch its attributes.

<div (onMutation)="attributesChanged($event)" [mutationConfig]="{attributes: true}"></div>

License

This project is licensed under an MIT license.