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replace with 50.0.0-rc03 code; closes #1047
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,183 @@ | ||
| import { html, LitElement, css } from "lit"; | ||
| /******************************************************************************* | ||
| * Copyright (c) 2009-2023 Jean-François Lamy | ||
| * | ||
| * Licensed under the Non-Profit Open Software License version 3.0 ("NPOSL-3.0") | ||
| * License text at https://opensource.org/licenses/NPOSL-3.0 | ||
| *******************************************************************************/ | ||
|
|
||
| /** | ||
| * A web component that listens to {@code beforeunload} events and sends them to server-side. | ||
| * This requires Flow and a corresponding server-side Java component to work properly. | ||
| * Alternatively, make sure that this.$server.visibilityChange() is available. | ||
| * Based on the code written by Kaspar Scherrer and Stuart Robinson: https://vaadin.com/forum/thread/17523194/unsaved-changes-detect-page-exit-or-reload | ||
| * | ||
| * author: miki@vaadin.com | ||
| */ | ||
| export class UnloadObserver extends LitElement { | ||
| render() { | ||
| return html` | ||
| <form id="reloadForm" action="../expired" method="post" style="display: none;"> | ||
| <input type="text" id="reloadTitle" name="reloadTitle" value="${this.reloadTitle}"> | ||
| <input type="text" id="reloadText" name="reloadText" value="${this.reloadText}"> | ||
| <input type="text" id="reloadLabel" name="reloadLabel" value="${this.reloadLabel}"> | ||
| <input type="text" id="reloadUrl" name="reloadUrl" value="${this.reloadUrl}"> | ||
| </form>`; | ||
| } | ||
|
|
||
| static get is() { | ||
| return "unload-observer-pr"; | ||
| } | ||
|
|
||
| static get properties() { | ||
| return { | ||
| reloadTitle: {}, | ||
| reloadText: {}, | ||
| reloadLabel: {}, | ||
| reloadUrl: {}, | ||
| } | ||
| } | ||
|
|
||
| updated(changedProperties) { | ||
| console.warn("changed properties {} ", changedProperties) | ||
| if (changedProperties.has('reloadUrl')) { | ||
| this.postReload(); | ||
| } | ||
| } | ||
|
|
||
| postReload() { | ||
| let form = this.shadowRoot.querySelector('#reloadForm'); | ||
| console.warn("reload page, target location "+this.reloadUrl+" "); | ||
| form.submit(); | ||
| } | ||
|
|
||
| /** | ||
| * Initialises the observer and registers a beforeunload listener. | ||
| */ | ||
| initObserver() { | ||
| const src = this; | ||
| if (window.Vaadin.unloadObserver === undefined) { | ||
| window.Vaadin.unloadObserver = { | ||
| attemptHandler: undefined, | ||
| }; | ||
| } | ||
| if (window.Vaadin.unloadObserver.attemptHandler !== undefined) { | ||
| window.removeEventListener( | ||
| "beforeunload", | ||
| window.Vaadin.unloadObserver.attemptHandler | ||
| ); | ||
| window.removeEventListener( | ||
| "unload", | ||
| window.Vaadin.unloadObserver.unloadHandler | ||
| ); | ||
| window.removeEventListener( | ||
| "pagehide", | ||
| window.Vaadin.unloadObserver.unloadHandler | ||
| ); | ||
| document.removeEventListener( | ||
| "visibilitychange", | ||
| window.Vaadin.unloadObserver.visibilityHandler | ||
| ); | ||
| window.removeEventListener( | ||
| "blur", | ||
| window.Vaadin.unloadObserver.blurHandler | ||
| ); | ||
| window.removeEventListener( | ||
| "focus", | ||
| window.Vaadin.unloadObserver.focusHandler | ||
| ); | ||
| } | ||
|
|
||
| window.Vaadin.unloadObserver.attemptHandler = (event) => { | ||
| src.visibilityChange(src, event, "beforeunload") | ||
| }; | ||
|
|
||
| window.Vaadin.unloadObserver.unloadHandler = (event) => { | ||
| src.visibilityChange(src, event, "unload") | ||
| }; | ||
|
|
||
| window.Vaadin.unloadObserver.hideHandler = (event) => | ||
| src.visibilityChange(src, event, "pagehide"); | ||
|
|
||
| window.Vaadin.unloadObserver.visibilityHandler = (event) => | ||
| { | ||
| console.warn("visibility "+document.visibilityState); | ||
| if (document.visibilityState === 'hidden') { | ||
| src.visibilityChange(src, event, "visibilityHidden"); | ||
| } else { | ||
| src.visibilityChange(src, event, "visibilityShown"); | ||
| } | ||
| } | ||
|
|
||
| window.Vaadin.unloadObserver.blurHandler = (event) => | ||
| { | ||
| console.warn("blur "+document.visibilityState); | ||
| src.visibilityChange(src, event, "blur"); | ||
| } | ||
|
|
||
| window.Vaadin.unloadObserver.focusHandler = (event) => | ||
| { | ||
| console.warn("focus "+document.visibilityState); | ||
| src.visibilityChange(src, event, "focus"); | ||
| } | ||
|
|
||
| window.addEventListener( | ||
| "beforeunload", | ||
| window.Vaadin.unloadObserver.attemptHandler | ||
| ); | ||
| window.addEventListener( | ||
| "unload", | ||
| window.Vaadin.unloadObserver.unloadHandler | ||
| ); | ||
| window.addEventListener( | ||
| "pagehide", | ||
| window.Vaadin.unloadObserver.hideHandler | ||
| ); | ||
| window.addEventListener( | ||
| "blur", | ||
| window.Vaadin.unloadObserver.blurHandler | ||
| ); | ||
| window.addEventListener( | ||
| "focus", | ||
| window.Vaadin.unloadObserver.focusHandler | ||
| ); | ||
| document.addEventListener( | ||
| "visibilitychange", | ||
| window.Vaadin.unloadObserver.visibilityHandler | ||
| ); | ||
|
|
||
| } | ||
|
|
||
| /** | ||
| * Invoked in response to beforeunload browser event. | ||
| * @param source An unload observer. | ||
| * @param event Event that happened. | ||
| */ | ||
| visibilityChange(source, event, change) { | ||
| if (window.Vaadin.unloadObserver.query) { | ||
| console.warn("UO: responding to unload attempt..."); | ||
| event.preventDefault(); | ||
| event.returnValue = ""; | ||
| if (source.$server) { | ||
| source.$server.visibilityChange(change); | ||
| } | ||
| } else { | ||
| source.$server.unloadHappened(change); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Controls whether or not prevent unload events. | ||
| * @param value When {@code truthy} (recommended String "true"), unload event will be prevented. | ||
| */ | ||
| queryOnUnload(value) { | ||
| if (value) { | ||
| window.Vaadin.unloadObserver.query = "true"; | ||
| } else { | ||
| delete window.Vaadin.unloadObserver.query; | ||
| } | ||
| } | ||
|
|
||
| } | ||
|
|
||
| customElements.define(UnloadObserver.is, UnloadObserver); |
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