PageRevealEvent
PageRevealEvent 事件对象在 pagereveal 事件的处理函数中可用。
在跨文档导航期间，如果导航触发了视图过渡，它允许您从导航到的文档中操作相关的 视图过渡（提供对相关 ViewTransition 对象的访问）。
在视图过渡之外，此事件对于触发启动动画或报告页面浏览量等场景也很有用。它等效于跨文档导航后运行的第一个 Window.requestAnimationFrame()，如果您在文档的 <head> 中触发 requestAnimationFrame()。例如，如果您在 <head> 中运行以下 reveal() 函数：
js
function reveal() {
// Include startup animation here
}
/* This will fire in the first rendered frame after loading */
requestAnimationFrame(() => reveal());
/* This will fire if the page is restored from BFCache */
window.onpagehide = () => requestAnimationFrame(() => reveal());
构造函数
PageRevealEvent()-
创建一个新的
PageRevealEvent对象实例。
实例属性
viewTransition只读-
包含一个
ViewTransition对象，代表该跨文档导航的活动视图过渡。
示例
js
window.addEventListener("pagereveal", async (e) => {
// If the "from" history entry does not exist, return
if (!navigation.activation.from) return;
// Only run this if an active view transition exists
if (e.viewTransition) {
const fromUrl = new URL(navigation.activation.from.url);
const currentUrl = new URL(navigation.activation.entry.url);
// Went from profile page to homepage
// ~> Set VT names on the relevant list item
if (isProfilePage(fromUrl) && isHomePage(currentUrl)) {
const profile = extractProfileNameFromUrl(fromUrl);
// Set view-transition-name values on the elements to animate
document.querySelector(`#${profile} span`).style.viewTransitionName =
"name";
document.querySelector(`#${profile} img`).style.viewTransitionName =
"avatar";
// Remove names after snapshots have been taken
// so that we're ready for the next navigation
await e.viewTransition.ready;
document.querySelector(`#${profile} span`).style.viewTransitionName =
"none";
document.querySelector(`#${profile} img`).style.viewTransitionName =
"none";
}
// Went to profile page
// ~> Set VT names on the main title and image
if (isProfilePage(currentUrl)) {
// Set view-transition-name values on the elements to animate
document.querySelector(`#detail main h1`).style.viewTransitionName =
"name";
document.querySelector(`#detail main img`).style.viewTransitionName =
"avatar";
// Remove names after snapshots have been taken
// so that we're ready for the next navigation
await e.viewTransition.ready;
document.querySelector(`#detail main h1`).style.viewTransitionName =
"none";
document.querySelector(`#detail main img`).style.viewTransitionName =
"none";
}
}
});
注意：请参阅Chrome DevRel 团队成员列表以获取此代码所引用的实时演示。
规范
| 规范 |
|---|
| HTML # the-pagerevealevent-interface |
浏览器兼容性
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