Dengan sebuah image transparan (PNG/GIF) kita dapat membuat satu kreasi background bergerak dengan sentuhan jQuery b-) Beberapa alat yang dibutuhkan dalam karya ini:
- Gambar latar belakang yang mantap punya.
- Gambar depan transparan guna menampakan efek gerak.
- Sedikit kode jQuery plug-in.
Kode CSS
.scrollBg {
background-image: url(background.jpg);
background-color: #000000;
width: 487px;
height: 83px;
}
.scrollBg img {
display: block;
}
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
Minimal versi jQuery yg dibutuhkan, jika sudah punya versi lebih baru jangan dipakai lagi, dan letakan di bawah kode tag <head>jQuery Plug-in
<script type="text/javascript" src="url_to_moving_background.js"></script>
<script type="text/javascript">
/*
* @author Alexander Farkas
* v. 1.21
*/
(function($) {
if(!document.defaultView || !document.defaultView.getComputedStyle){ // IE6-IE8
var oldCurCSS = jQuery.curCSS;
jQuery.curCSS = function(elem, name, force){
if(name === 'background-position'){
name = 'backgroundPosition';
}
if(name !== 'backgroundPosition' || !elem.currentStyle || elem.currentStyle[ name ]){
return oldCurCSS.apply(this, arguments);
}
var style = elem.style;
if ( !force && style && style[ name ] ){
return style[ name ];
}
return oldCurCSS(elem, 'backgroundPositionX', force) +' '+ oldCurCSS(elem, 'backgroundPositionY', force);
};
}
var oldAnim = $.fn.animate;
$.fn.animate = function(prop){
if('background-position' in prop){
prop.backgroundPosition = prop['background-position'];
delete prop['background-position'];
}
if('backgroundPosition' in prop){
prop.backgroundPosition = '('+ prop.backgroundPosition;
}
return oldAnim.apply(this, arguments);
};
function toArray(strg){
strg = strg.replace(/left|top/g,'0px');
strg = strg.replace(/right|bottom/g,'100%');
strg = strg.replace(/([0-9\.]+)(\s|\)|$)/g,"$1px$2");
var res = strg.match(/(-?[0-9\.]+)(px|\%|em|pt)\s(-?[0-9\.]+)(px|\%|em|pt)/);
return [parseFloat(res[1],10),res[2],parseFloat(res[3],10),res[4]];
}
$.fx.step. backgroundPosition = function(fx) {
if (!fx.bgPosReady) {
var start = $.curCSS(fx.elem,'backgroundPosition');
if(!start){//FF2 no inline-style fallback
start = '0px 0px';
}
start = toArray(start);
fx.start = [start[0],start[2]];
var end = toArray(fx.options.curAnim.backgroundPosition);
fx.end = [end[0],end[2]];
fx.unit = [end[1],end[3]];
fx.bgPosReady = true;
}
//return;
var nowPosX = [];
nowPosX[0] = ((fx.end[0] - fx.start[0]) * fx.pos) + fx.start[0] + fx.unit[0];
nowPosX[1] = ((fx.end[1] - fx.start[1]) * fx.pos) + fx.start[1] + fx.unit[1];
fx.elem.style.backgroundPosition = nowPosX[0]+' '+nowPosX[1];
};
})(jQuery);
</script>
Ini kode script pemanggil dari plugin diatas.../*
* @author Alexander Farkas
* v. 1.21
*/
(function($) {
if(!document.defaultView || !document.defaultView.getComputedStyle){ // IE6-IE8
var oldCurCSS = jQuery.curCSS;
jQuery.curCSS = function(elem, name, force){
if(name === 'background-position'){
name = 'backgroundPosition';
}
if(name !== 'backgroundPosition' || !elem.currentStyle || elem.currentStyle[ name ]){
return oldCurCSS.apply(this, arguments);
}
var style = elem.style;
if ( !force && style && style[ name ] ){
return style[ name ];
}
return oldCurCSS(elem, 'backgroundPositionX', force) +' '+ oldCurCSS(elem, 'backgroundPositionY', force);
};
}
var oldAnim = $.fn.animate;
$.fn.animate = function(prop){
if('background-position' in prop){
prop.backgroundPosition = prop['background-position'];
delete prop['background-position'];
}
if('backgroundPosition' in prop){
prop.backgroundPosition = '('+ prop.backgroundPosition;
}
return oldAnim.apply(this, arguments);
};
function toArray(strg){
strg = strg.replace(/left|top/g,'0px');
strg = strg.replace(/right|bottom/g,'100%');
strg = strg.replace(/([0-9\.]+)(\s|\)|$)/g,"$1px$2");
var res = strg.match(/(-?[0-9\.]+)(px|\%|em|pt)\s(-?[0-9\.]+)(px|\%|em|pt)/);
return [parseFloat(res[1],10),res[2],parseFloat(res[3],10),res[4]];
}
$.fx.step. backgroundPosition = function(fx) {
if (!fx.bgPosReady) {
var start = $.curCSS(fx.elem,'backgroundPosition');
if(!start){//FF2 no inline-style fallback
start = '0px 0px';
}
start = toArray(start);
fx.start = [start[0],start[2]];
var end = toArray(fx.options.curAnim.backgroundPosition);
fx.end = [end[0],end[2]];
fx.unit = [end[1],end[3]];
fx.bgPosReady = true;
}
//return;
var nowPosX = [];
nowPosX[0] = ((fx.end[0] - fx.start[0]) * fx.pos) + fx.start[0] + fx.unit[0];
nowPosX[1] = ((fx.end[1] - fx.start[1]) * fx.pos) + fx.start[1] + fx.unit[1];
fx.elem.style.backgroundPosition = nowPosX[0]+' '+nowPosX[1];
};
})(jQuery);
</script>
<script type="text/javascript">
$(document).ready(function() {
moveBgAround();
});
function moveBgAround() {
//give a random value from 0 to 400 for the X axis and the Y axis
var x = Math.floor(Math.random()*401);
var y = Math.floor(Math.random()*401);
//random generated time it takes to move
var time = Math.floor(Math.random()*1001) + 2000;
//make the background image move!
$('.scrollBg').animate({
backgroundPosition: '(' + (x * -1) + 'px ' + (y * -1) + 'px)'
}, time, "swing", function() {
moveBgAround();
});
}
</script>
Kalau menurut cara diletakan dibagaian tag <head> coba dahulu letakin diatas kode </body> Selama pengalaman kalau script plugin di basis blogspot dapat disana kita menempatkannya (just try it) :P$(document).ready(function() {
moveBgAround();
});
function moveBgAround() {
//give a random value from 0 to 400 for the X axis and the Y axis
var x = Math.floor(Math.random()*401);
var y = Math.floor(Math.random()*401);
//random generated time it takes to move
var time = Math.floor(Math.random()*1001) + 2000;
//make the background image move!
$('.scrollBg').animate({
backgroundPosition: '(' + (x * -1) + 'px ' + (y * -1) + 'px)'
}, time, "swing", function() {
moveBgAround();
});
}
</script>
Kode HTML
Ini bagian dimana kita mau pakai, dalam penggunaan tinggal memakai...<div class='scrollBg'>
<img src='overlay.png' alt='' />
</div>
Itu jika kita memakai gambar background yg telah diletakan pada bagian CSS secara permanen. Jika kita ingin menggunakan background masing² maka HTML yg digunakan dapat memakai cara berikut...<div class='scrollBg' style='background-image: url(http://link-gambar-nanti-yg-bergeraknya.jpg)'>
<img src='http://link-gambar-transparan-yg-nanti-diberi-efek-oleh-gambar-pertama-diatas.png' alt='' />
</div>
Good luck and happy blogging \m/
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