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Solve the problem that jQuery cannot implement Background Image Positioning animation in FireFox.

Source: Internet
Author: User
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In general, the method to implement the positioning animation of the background image is very simple and compatible with various iyjt:
1
$ (Elem). animate ({backgroundPositionX: '-39px', backgroundPositionY: '-39px'}, 500 );
However, Firefox does not support this method. After searching by Google for half a day, I finally found a solution, that is, the $. fx. step Method of jQuery extension:

01
(Function ($ ){
02
$. Extend ($. fx. step ,{
03
BackgroundPosition: function (fx ){
04
If (fx. state ===0 & typeof fx. end = 'string '){
05
Var start = $. curCSS (fx. elem, 'backgroundposition ');
06
Start = toArray (start );
07
Fx. start = [start [0], start [2];
08
Var end = toArray (fx. end );
09
Fx. end = [end [0], end [2];
10
Fx. unit = [end [1], end [3];
11
}
12
Var nowPosX = [];
13
NowPosX [0] = (fx. end [0]-fx. start [0]) * fx. pos) + fx. start [0] + fx. unit [0];
14
NowPosX [1] = (fx. end [1]-fx. start [1]) * fx. pos) + fx. start [1] + fx. unit [1];
15
Fx. elem. style. backgroundPosition = nowPosX [0] + ''+ nowPosX [1];
16
 
17
Function toArray (strg ){
18
Strg = strg. replace (/left | top/g, '0px ');
19
Strg = strg. replace (/right | bottom/g, '000000 ');
20
Strg = strg. replace (/([0-9 \.] +) (\ s | \) | $)/g, "$ 1px $2 ");
21
Var res = strg. match (/(-? [0-9 \.] +) (px | \ % | em | pt) \ s (-? [0-9 \.] +) (px | \ % | em | pt )/);
22
Return [parseFloat (res [1], 10), res [2], parseFloat (res [3], 10), res [4];
23
}
24
}
25
});
26
}) (JQuery );
Usage:
1
$ (Elem). animate ({backgroundPosition: '(0-39px)'}, 500 );
Source of this method:
Article: http://snook.ca/archives/javascript/jquery-bg-image-animations/
Example: http://snook.ca/technical/jquery-bg/

A complete example is attached:
 
01
<! DOCTYPE html>
02
<Html>
03
<Head>
04
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
05
<Meta name = "author" content = "pandao QQ: 272383090"/>
06
<Title> jQuery Background Image Positioning animation (which can solve the problem that FF does not support) </title>
07
<Style type = "text/css">
08
* {Margin: 0; padding: 0 ;}
09
Body {font-size: 14px; color: #444; font-family: "", Arial; background: # fff ;}
10
Img {border: none; vertical-align: middle ;}
11
# Test {width: 200px; height: 50px; margin: 100px auto; border: 3px solid red; padding: 10px; cursor: pointer; background: # fff url (http://www.bkjia.com/uploadfile/2012/0814/20120814094115952.png) no-repeat left top ;}
12
</Style>
13
</Head>
14
<Body>
15
<Div id = "test"> TEST </div>
16
<Script type = "text/javascript" src = "http://code.jquery.com/jquery-1.7.1.min.js"> </script>
17
<Script type = "text/javascript">
18
(Function ($ ){
19
$. Extend ($. fx. step ,{
20
BackgroundPosition: function (fx ){
21
If (fx. state ===0 & typeof fx. end = 'string '){
22
Var start = $. curCSS (fx. elem, 'backgroundposition ');
23
Start = toArray (start );
24
Fx. start = [start [0], start [2];
25
Var end = toArray (fx. end );
26
Fx. end = [end [0], end [2];
27
Fx. unit = [end [1], end [3];
28
}
29
Var nowPosX = [];
30
NowPosX [0] = (fx. end [0]-fx. start [0]) * fx. pos) + fx. start [0] + fx. unit [0];
31
NowPosX [1] = (fx. end [1]-fx. start [1]) * fx. pos) + fx. start [1] + fx. unit [1];
32
Fx. elem. style. backgroundPosition = nowPosX [0] + ''+ nowPosX [1];
33
 
34
Function toArray (strg ){
35
Strg = strg. replace (/left | top/g, '0px ');
36
Strg = strg. replace (/right | bottom/g, '000000 ');
37
Strg = strg. replace (/([0-9 \.] +) (\ s | \) | $)/g, "$ 1px $2 ");
38
Var res = strg. match (/(-? [0-9 \.] +) (px | \ % | em | pt) \ s (-? [0-9 \.] +) (px | \ % | em | pt )/);
39
Return [parseFloat (res [1], 10), res [2], parseFloat (res [3], 10), res [4];
40
}
41
}
42
});
43
}) (JQuery );
44
 
45
// Usage
46
$ (Function (){
47
// It doesn't matter if css is added or not.
48 www.2cto.com
Certificate ('{test'}.css ({backgroundPosition: "0 0"}). hover (function (){
49
$ (This). animate ({backgroundPosition: "(0-250px)" },{ duration: 500 });
50
}, Function (){
51
$ (This). animate ({backgroundPosition: "(0 0)" },{ duration: 500 });
52
});
53
});
54
</Script>
55
</Body>
56
</Html>


Author: pandao

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.

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