The oldState read-only property of the ToggleEvent interface is a string representing the state the element is transitioning from.
ToggleEvent: oldState property
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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
oldState |
114 | 114 | 114 | No | 100 | 17 | 114 | 114 | No | No | 17 | No |
See also
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https://developer.mozilla.org/en-US/docs/Web/API/ToggleEvent/oldState