command | oncommand event

Fired whenever a user interface (UI) action takes place.

Syntax

HTML Attribute	<element oncommand = "handler(event)">
addEventListener Method	object.addEventListener("command", handler, useCapture)

Event information

Synchronous	Yes
Bubbles	Yes
Cancelable	Yes

Event handler parameters

event: Type: CommandEvent

Remarks

This event provides a hook into the UI action currently taking place, allowing you to update the page state and UI and / or prevent default event behavior.

The command is fired for all of the following Windows UI Automation (UIA) methods:

commandName	UIA Method
toggle	IToggleProvider::Toggle
expand	IExpandCollapseProvider::Expand
collapse	IExpandCollapseProvider::Collapse
scrollIntoView	IScrollItemProvider::ScrollIntoView
select	ISelectionItemProvider::Select
addToSelection	ISelectionItemProvider::AddToSelection
removeFromSelection	ISelectionItemProvider::RemoveFromSelection
setValue	IValueProvider::SetValue
scrollHorizontal	IScrollProvider::Scroll
scrollVertical	IScrollProvider::Scroll
setHorizontalScrollPercent	IScrollProvider::SetScrollPercent

Examples

JavaScript


function handleCommand(evt) {
    var myContainer = document.getElementById("content");
    if (evt.target == myContainer && evt.commandName == "toggle") {
        evt.preventDefault();
    }
}