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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/toggle_event below:

HTMLElement: toggle event - Web APIs

Baseline Widely available *

The toggle event of the HTMLElement interface fires on a popover element, <dialog> element, or <details> element just after it is shown or hidden.

• If the element is transitioning from hidden to showing, the event.oldState property will be set to closed and the event.newState property will be set to open.
• If the element is transitioning from showing to hidden, then event.oldState will be open and event.newState will be closed.

This event is not cancelable.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("toggle", (event) => { })

ontoggle = (event) => { }

The example code below demonstrates how the toggle event might be used for popover. The same code is might be used for a <dialog> or <details> elements in the same way.

This example shows how to listen for the toggle event and log the result.

The HTML consists of a popover and a button for toggling it open and closed.

<button popovertarget="mypopover">Toggle the popover</button>
<div id="mypopover" popover>Popover content</div>

#log {
  height: 150px;
  overflow: scroll;
  padding: 0.5rem;
  border: 1px solid black;
}

const logElement = document.querySelector("#log");
function log(text) {
  logElement.innerText = `${logElement.innerText}${text}\n`;
  logElement.scrollTop = logElement.scrollHeight;
}

The code adds an event listener for the toggle event and logs the state.

const popover = document.getElementById("mypopover");

popover.addEventListener("toggle", (event) => {
  if (event.newState === "open") {
    console.log("Popover has been shown");
  } else {
    console.log("Popover has been hidden");
  }
});

If multiple toggle events are fired before the event loop has a chance to cycle, only a single event will be fired. This is referred to as "event coalescing".

For example:

popover.addEventListener("toggle", () => {
  // …
});

popover.showPopover();
popover.hidePopover();
// `toggle` only fires once

• Opening a modal dialog example in HTMLDialogElement

• popover HTML global attribute
• Popover API
• Related event: beforetoggle

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