ToggleEvent: oldState property - Web APIs | MDN (original) (raw)

Baseline 2023

Newly available

Since ⁨November 2023⁩, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

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The oldState read-only property of the ToggleEvent interface is a string representing the state the element is transitioning from.

Value

A string. Possible values are "open" (the popover is going from showing to hidden) or "closed" (the popover going from hidden to shown).

Examples

js

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

// …

popover.addEventListener("beforetoggle", (event) => {
  if (event.oldState === "open") {
    console.log("Popover is being hidden");
  } else {
    console.log("Popover is being shown");
  }
});

Specifications

Browser compatibility

See also

• Popover API