Home > Others

Differences between JS parentelement and offsetparent

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

The first is the parentelement attribute. This attribute is easy to understand, that is, the parent-child relationship defined in the DOM hierarchy. If element a contains Element B, Element B can obtain element a through the parentelement attribute.
Here we mainly talk about the offsetparent attribute, which is not clearly explained in the msdn document, which makes it harder to understand this attribute. I have found some information on the Internet over the past few days and added some tests of my own. I have a little understanding of this attribute and will summarize it here.
To understand the offsetparent attribute, you must first specify the name of the "positioned element". The so-called "positioned element" refers to the style that sets the position attribute for the element, and the value of the position style attribute is equal to one of absolute, relative, and fixed.
When you use the offsetparent attribute to obtain a parent-level object, there are two situations:
1. The element has been located.
If the element itself has been located, the offsetparent attribute returns the parent element that has been located for this element. If no parent element has been located, the body object is returned, for example: CopyCode The Code is as follows: <body>
<P>
<Div>
<Span id = "obj1" style = "position: absolute"> </span>
</Div>
<Div id = "pobj1" style = "position: absolute">
<Span id = "obj2" style = "position: absolute"> </span>
</Div>
</P>
</Body>

Obj1.offsetparent returns the body object
Obj2.offsetparent returns the pobj1 object
2. The element is not located.
If the element is not located, offsetparent will not only find the parent element that has been located, but also find the parent element of the type TD and table, if any of the three parent elements is found, this element is returned. Otherwise, the body object is returned, for example:Copy codeThe Code is as follows: <Table width = "500" border = "0">
<Tr>
<TD id = "TD1">
<Div id = "pobj1">
<Span id = "obj1"> </span>
</Div>
</TD>
</Tr>
<Tr>
<TD>
<Div id = "pobj2" style = "position: relative">
<Span id = "obj2"> </span>
</Div>
</TD>
</Tr>
</Table>

Obj1.offsetparent returns the TD1 object
Obj2.offsetparent returns the pobj2 object
There is also the parentnode attribute in the attributes of the DOM element. In fact, this attribute is similar to the parentelement attribute. The parentelement attribute is unique to IE, And the W3C standard uses the parentnode attribute, children and childnodes are also exclusive to IE, and childnodes is supported by others.

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:
powershell compare two files and output differences compare two excel files and highlight differences apple watch series 1 and 2 differences js search and replace node js and npm time and date between node js and angularjs tutorial

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