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Stimulus example: smart scroll
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| <div data-controller="smart-scroll" | |
| data-action="smart-scroll:added->smart-scroll#handleAdded | |
| resize->smart-scroll#handleAdded | |
| scroll->smart-scroll#handleScroll"> | |
| <div data-controller="smart-scroll-item"> | |
| aya: an an | |
| </div> | |
| <div data-controller="smart-scroll-item"> | |
| hatate: ni hao | |
| </div> | |
| <!-- add more smart-scroll-item dynamically... --> | |
| </div> |
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| import { Controller } from 'stimulus' | |
| import Rails from 'rails-ujs' | |
| const observer = new ResizeObserver(entries => { | |
| for (let entry of entries) { | |
| Rails.fire(entry.target, 'resize') | |
| } | |
| }) | |
| export default class extends Controller { | |
| connect() { | |
| observer.observe(this.element) | |
| this.shouldScroll = true | |
| this.scrollToBottom() | |
| } | |
| disconnect() { | |
| observer.unobserve(this.element) | |
| } | |
| scrollToBottom() { | |
| const { scrollHeight, clientHeight, offsetHeight } = this.element | |
| if (scrollHeight >= clientHeight) { | |
| this.element.scrollTop = scrollHeight - clientHeight | |
| } | |
| } | |
| handleAdded() { | |
| const { scrollHeight, clientHeight } = this.element | |
| if (clientHeight >= scrollHeight) { | |
| this.shouldScroll = true | |
| } | |
| if (this.shouldScroll) { | |
| this.scrollToBottom() | |
| } | |
| } | |
| handleScroll() { | |
| const { scrollTop, scrollHeight, clientHeight, offsetHeight } = this.element | |
| if (clientHeight >= scrollHeight) { | |
| this.shouldScroll = true | |
| } else { | |
| this.shouldScroll = | |
| Math.abs((scrollTop + offsetHeight) - scrollHeight) < 1 | |
| } | |
| } | |
| } |
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| import { Controller } from 'stimulus' | |
| import { getParentController } from 'stimulus_utils' | |
| import Rails from 'rails-ujs' | |
| export default class extends Controller { | |
| connect() { | |
| const parent = getParentController(this, 'smart-scroll') | |
| Rails.fire(parent.element, 'smart-scroll:added') | |
| } | |
| } |
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| export function getParentController(controller, identifier) { | |
| const application = controller.application | |
| let element = controller.element | |
| do { | |
| let foundController = | |
| application.getControllerForElementAndIdentifier(element, identifier) | |
| if (foundController) { | |
| return foundController | |
| } | |
| } while (element = element.parentElement) | |
| } |
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