HTMLElement: command event
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The command event of the HTMLElement interface fires on an element that is controlled via a button with valid commandForElement and command values, whenever the button is interacted with (e.g., it is clicked).
Syntax
Use the event name in methods like addEventListener(), or set an event handler property.
addEventListener("command", (event) => { })
oncommand = (event) => { }
Event type
A CommandEvent. Inherits from Event.
Examples
Basic example
const popover = document.getElementById("mypopover");
// …
popover.addEventListener("command", (event) => {
if (event.action === "show-popover") {
console.log("Popover is about to be shown");
}
});
Event dispatch and cancellation
It is worth pointing out that command events fire on the element being invoked. If the button is clicked, it will first dispatch a click event which, if cancelled, then the command event will not fire and the default behavior will not be run.
In addition to cancelling the click event on the button, it is also possible to cancel the command event.
For example:
button.addEventListener("click", (event) => {
event.preventDefault(); // the `command` event will never fire
});
element.addEventListener("command", (event) => {
event.preventDefault(); // the `command` event fires but the default behavior is cancelled
});
Specifications
| Specification |
|---|
| HTML # event-command |
Browser compatibility
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