Home > Developer > JavaScript

Using JavaScript to drag Elements

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞
Note:
Drag Process
Mouse-> (move the mouse-> move the element)
Move the mouse and press the button to start.

For IE, we mainly use obj. attachevent () & obj. detachevent ()
For Firefox, obj. addeventlistener () & obj. removeeventlistener of Dom 2 is mainly used.
Both methods are supported by opera.

In this article, the style attribute must be set to position: absolute;
Specify the coordinate values of left & Top, such:

Linenum
<Div style = "border: 1px dashed blue; width: 180px; text-align: center; position: absolute; left: 100px; top: 150px; "onmousedown =" fdragging (this, event, true); ">
Element 1 <br/>
Dragging compatibility for IE, opera, Firefox.
</Div>

Description of parameters of the fdragging (OBJ, E, limit) function:
OBJ: HTML element object, the element to be dragged
E: Specifies the event object, which is compatible with Firefox.
Limit: A boolean value that specifies whether to drag a parent element only. False can be moved to any position.

The fdragging (OBJ, E, limit) function should be used under the HTML onmousedown attribute, for example:

Linenum
<Div style = "border: 1px dashed blue; width: 180px; text-align: center; position: absolute; left: 50px; top: 50px; "onmousedown =" fdragging (this, event, true); ">
Element <br/>
Dragging compatibility for IE, opera, Firefox.
</Div>

Shawl. Qiu
2006-11-10
Http://blog.csdn.net/btbtd

Function: fdragging (OBJ, E, limit) and usage demonstration

Linenum
<! 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">
<! -- Dw6 -->
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Title> shawl. Qiu template </title>
<SCRIPT type = "text/JavaScript">
// <! [CDATA [
Function fdragging (OBJ, E, limit ){
If (! E) E = Window. event;
VaR x = parseint (obj. style. Left );
Var y = parseint (obj. style. Top );

VaR X _ = E. clientx-X;
Var y _ = E. clienty-y;

If (document. addeventlistener ){
Document. addeventlistener ('mousemove ', infmove, true );
Document. addeventlistener ('mouseup', infup, true );
} Else if (document. attachevent ){
Document. attachevent ('onmousemove ', infmove );
Document. attachevent ('onmouseup', infup );
}

Infstop (E );
Infabort (E)

Function infmove (e ){
VaR EVT;
If (! E) E = Window. event;

If (Limit ){
VaR op = obj. parentnode;
VaR opx = parseint (op. style. Left );
VaR opy = parseint (op. style. Top );

If (E. clientx-X _) <0) return false;
Else if (E. clientx-X _ + obj. offsetwidth + opx)> (opx + OP. offsetwidth) return false;

If (E. clienty-Y _ <0) return false;
Else if (E. clienty-Y _ + obj. offsetheight + opy)> (opy + OP. offsetheight) return false;
// Status = E. clienty-Y _;
}

OBJ. style. Left = E. clientx-X _ + 'px ';
OBJ. style. Top = E. clienty-Y _ + 'px ';

Infstop (E );
} // Shawl. Qiu script
Function infup (e ){
VaR EVT;
If (! E) E = Window. event;

If (document. removeeventlistener ){
Document. removeeventlistener ('mousemove ', infmove, true );
Document. removeeventlistener ('mouseup', infup, true );
} Else if (document. detachevent ){
Document. detachevent ('onmousemove ', infmove );
Document. detachevent ('onmouseup', infup );
}

Infstop (E );
} // Shawl. Qiu script

Function infstop (e ){
If (E. stoppropagation) Return e. stoppropagation ();
Else return E. cancelbubble = true;
} // Shawl. Qiu script
Function infabort (e ){
If (E. preventdefault) Return e. preventdefault ();
Else return E. returnvalue = false;
} // Shawl. Qiu script
}
//]>
</SCRIPT>
</Head>
<Body>
<Div style = "border: 1px dashed blue; width: 760px; Height: 600px; text-align: center; position: absolute; left: 100px; top: 10px; "> This parent

<Div style = "border: 1px dashed blue; width: 180px; text-align: center; position: absolute; left: 50px; top: 50px; "onmousedown =" fdragging (this, event, true); ">
Element <br/>
Dragging compatibility for IE, opera, Firefox.
</Div>
<Div style = "border: 1px dashed blue; width: 180px; text-align: center; position: absolute; left: 100px; top: 150px; "onmousedown =" fdragging (this, event, true); ">
Element 1 <br/>
Dragging compatibility for IE, opera, Firefox.
</Div>
<Div style = "border: 1px dashed blue; width: 180px; text-align: center; position: absolute; left: 200px; top: 250px; "onmousedown =" fdragging (this, event, false); ">
Element 2 <br/>
Dragging compatibility for IE, opera, Firefox. <br/>
<Font color = "red"> dragging everywhere </font>
</Div>
</Div>
</Body>
</Html>

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:
javascript treeview drag and drop javascript print array elements javascript splice multiple elements javascript array count elements javascript form elements javascript get form elements how to print html page using 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