Event bubbling and event capture in JavaScript to prevent event bubbling and event Source Target

Source: Internet
Author: User

Event bubbling

Event Capture: parent-level elements are triggered first, and child-level elements are triggered later.

Event bubbling: Child-level elements are triggered first, and parent-level elements are triggered later.

Currently, in IE and FF, trigger events are basically event bubbles and executed from inside to outside.

 
<! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<HTML xmlns = "http://www.w3.org/1999/xhtml">  

When you click div2, "internal" is displayed first, and "external" is displayed. This is the event bubble.

Prevent event bubbles

Method:

Function stopbubble (event) {If (event & event. stoppropagation) {event. stoppropagation () ;}else {window. event. cancelbubble = true ;}}

Usage:

 
// Monitor when the user moves the mouse over the element. // Add a red border uniondom [I] to the element. onmouseover = function (e) {This. style. border = "1px solid red"; stopbubble (e );};

Get event Source:

Function (event) {var E = event | window. event; var ELEM = E. srcelement | e.tar get; alert (ELEM. ID); // ELEM is the event source}

Refer:

Javascript event bubbling and event capture

Javascript prevents bubble events, event source target, and current target currenttarget

Javascript prevents event bubbling and default browser behavior

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.