Event developer guide



The overview page provides an introduction to the design pattern and a summary of the types of incidents which are defined and reacted to by modern web browsers.

The custom events page describes how the event code design pattern can be used in custom code to define new event types emitted by user objects, register listener functions to handle those events, and trigger the events in user code.

The remaining pages describe how to use events of different kinds defined by web browsers. Unfortunately, these events have been defined piece by piece as web browsers have evolved so that there is no satisfying systematic characterization of the events built-in or defined by modern web browsers.

The device on which the web browser is running can trigger events, for example due to a change in its position and orientation in the real world, as discussed partially by the page on orientation coordinate systems and the page on the use of 3D transforms. That is different, but similar, to the change in device vertical orientation. 

The 窗口 in which the browser is displayed which might trigger events, for example, change size if the user maximizes the window or otherwise changes it.

The process loading of a web page might trigger events in response to the completion of different steps in the downloading, parsing, and rendering of the web page for display to the user.

The user interaction with the web page contents might trigger events. The events triggered by user interaction evolved during the early years of browser design and include a complicated system defining the sequence in which events will be called and the manner in which that sequence can be controlled. The different types of user interaction driven events include:

The modification of the web page in structure or content might trigger some events, as is explained in the mutation events page, but the use of these events has been deprecated in favour of the lighter Mutation Observer approach.

The media streams embedded in the HTML documents might trigger some events, as explained in the media events page.

The network requests made by a web page might trigger some events.

There are many other sources of events defined by web browsers for which pages are not yet available in this guide.

Note: This Event Developer Guide needs substantial work. The structure needs to be reorganized and the pages rewritten. Our hope is that everything you need to know about events will go under here.


DOM 事件回调
A possible way to get notified of Events of a particular type (such as click) for a given object is to specify the event handler using:
Mutation events
Mutation events provide a mechanism for a web page or an extension to get notified about changes made to the DOM. Use Mutation Observers instead if possible.
Orientation 和 motion 数据解释
Overview of Events and Handlers
Events and event handling provide a core technique in Javascript for reactivity to incidents which occur during the time a web page is kept open by a user, including incidents which occur while a page is being prepared for display, incidents due to user interaction with the content of the web page, incidents related to the device on which the browser is running, or incidents due to many other causes such as media stream playback or animation timing.
创建和触发 events
本文演示了如何创建和分发(dispatch) 事件。


 此页面的贡献者: NoDocCat, Tankunpeng, Jeremie
 最后编辑者: NoDocCat,