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

Source: Internet
Author: User
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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

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Related Keywords:
event bubbling vs capturing event pdx event source javascript onclick event mousedown event javascript how to call javascript function in php without any event security information and event management siem

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