ToggleEvent: oldState property
Baseline 2024
Newly available
Since April 2024, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.
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
| Specification |
|---|
| HTML Standard # dom-toggleevent-oldstate |
Browser compatibility
| desktop | mobile | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
oldState | |||||||||||