Home > Others

An example analysis of event capture model and bubbling model in JS

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

The implementation methods are as follows:

Example 1:

code is as follows: <html>


<head>


<script type= "Text/javascript" >


window.onload = function () {


document.getElementById (' par '). AddEventListener (' click ', function () {alert (' par ');},true);


document.getElementById (' son '). AddEventListener (' click ', function () {alert (' son ');},true);


 }


</script>


<style type= "Text/css" >


#par {Width:300px;height:200px;background:gray}


#son {Width:200px;height:100px;background:green}


</style>


</head>


<body>


<div id= "par" >


<div id= "Son" ></div>


</div>


</body>


</html>


Example 2:

code is as follows: <html>


<head>


<script type= "Text/javascript" >


window.onload = function () {


document.getElementById (' par '). AddEventListener (' click ', function () {alert (' par ');});


document.getElementById (' son '). AddEventListener (' click ', function () {alert (' son ');});


 }


</script>


<style type= "Text/css" >


#par {Width:300px;height:200px;background:gray}


#son {Width:200px;height:100px;background:green}


</style>


</head>


<body>


<div id= "par" >


<div id= "Son" ></div>


</div>


</body>


</html>

AddEventListener: The third parameter is an optional parameter, which is false by default, which means the bubble model, which triggers the smallest layer (the div with the id son), and if you add the true parameter, it is the capture model (from the html-->body--- >DIV), triggering at such a level.

Instance 1 of the HTML code has two Div, small div contained in large Div, click on Small div, first trigger alert (' par ') event, then trigger alert (' son ') the whole piece. Instance 2 is just the opposite.

If you are using the object. onclick property to trigger the event, the bubble model is used.

IE does not support AddEventListener, but uses attachevent. But Attachevent does not support a third parameter, it does not capture the model.

I hope this article will help you with your JavaScript programming.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
static model example arima model example php model example waterfall model example rbac model example waterfall model example project event bubbling javascript

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.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

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

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

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

    Open a Ticket

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

    Learn More