Attention! This repository is archived and the library has been moved to tinkoff/ng-web-apis monorepository

Part of Web APIs for Angular

This is a library for declarative use of Mutation Observer API with Angular.

If you do not have @ng-web-apis/common:

npm i @ng-web-apis/common

Now install the package:

npm i @ng-web-apis/mutation-observer

Add MutationObserverModule and then use (waMutationObserver)="onMutation($event)" directive to watch mutation in an element.

Alternatively use an Observable-based MutationObserverService manually to get MutationObserver in an RxJS Observable form.

Use attributes on an element to define MutationObserverInit config object. All attributes are boolean meaning no need to explicitly set them to true.

NOTE: Keep in mind these are used one time in constructor so you cannot use binding, only strings. Pass comma separated attribute names to set attributeFilter array.

<div
    subtree
    childList
    characterData
    attributeFilter="title, aria-label"
    [title]="title"
    [attr.aria-label]="label"
    (waMutationObserver)="onMutation($event)"
>
    ...
</div>

11+	14+	26+	7+

If you want to use this package with SSR, you need to mock MutationObserver class on the server. You can use our Universal package for this, see this example.

You can try online demo here

Other Web APIs for Angular by @ng-web-apis

Do you also want to open-source something, but hate the collateral work? Check out this Angular Open-source Library Starter we’ve created for our projects. It got you covered on continuous integration, pre-commit checks, linting, versioning + changelog, code coverage and all that jazz.