[](https://www.npmjs.com/package/@polymer/iron-scroll-target-behavior) [](https://travis-ci.org/PolymerElements/iron-scroll-target-behavior) [](https://webcomponents.org/element/@polymer/iron-scroll-target-behavior) ## IronScrollTargetBehavior `IronScrollTargetBehavior` allows an element to respond to scroll events from a designated scroll target. Elements that consume this behavior can override the `_scrollHandler` method to add logic on the scroll event. See: [Documentation](https://www.webcomponents.org/element/@polymer/iron-scroll-target-behavior), [Demo](https://www.webcomponents.org/element/@polymer/iron-scroll-target-behavior/demo/demo/index.html). ## Usage ### Installation ``` npm install --save @polymer/iron-scroll-target-behavior ``` ### In a Polymer 3 element ```js import {PolymerElement, html} from '@polymer/polymer'; import {mixinBehaviors} from '@polymer/polymer/lib/legacy/class.js'; import {IronScrollTargetBehavior} from '@polymer/iron-scroll-target-behavior/iron-scroll-target-behavior.js'; class SampleElement extends mixinBehaviors(IronScrollTargetBehavior, PolymerElement) { static get template() { return html`

Scrollable content here

`; } _scrollHandler() { console.log('_scrollHandler', this._scrollTop, this._scrollLeft); } } customElements.define('sample-element', SampleElement); ``` ## Contributing If you want to send a PR to this element, here are the instructions for running the tests and demo locally: ### Installation ```sh git clone https://github.com/PolymerElements/iron-scroll-target-behavior cd iron-scroll-target-behavior npm install npm install -g polymer-cli ``` ### Running the demo locally ```sh polymer serve --npm open http://127.0.0.1:/demo/ ``` ### Running the tests ```sh polymer test --npm ```