jquery html5 css3网站内容更新时间轴进度条效果,jquery html5 css3网站内容更新时间轴进度条效果...
特效描述：jquery html5css3 网站内容更新 时间轴进度条效果。时间轴两侧的内容随着滚动条滚动，动画形式从右侧加载到中间，也有时间轴快速跳到想要的月份内容
代码结构
1. 引入CSS
2. 引入JS
3. HTML代码
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$(function() {
var $sidescroll= (function() {
// the row elements
var $rows= $('#ss-container > div.ss-row'),
// we will cache the inviewport rows and the outside viewport rows
$rowsViewport, $rowsOutViewport,
// navigation menu links
$links= $('#ss-links > a'),
// the window element
$win= $(window),
// we will store the window sizes here
winSize= {},
// used in the scroll setTimeout function
anim= false,
// page scroll speed
scollPageSpeed= 2000 ,
// page scroll easing
scollPageEasing = 'easeInOutExpo',
// perspective?
hasPerspective= false,
perspective= hasPerspective && Modernizr.csstransforms3d,
// initialize function
init= function() {
// get window sizes
getWinSize();
// initialize events
initEvents();
// define the inviewport selector
defineViewport();
// gets the elements that match the previous selector
setViewportRows();
// if perspective add css
if( perspective ) {
$rows.css({
'-webkit-perspective': 600,
'-webkit-perspective-origin': '50% 0%'
});
}
// show the pointers for the inviewport rows
$rowsViewport.find('a.ss-circle').addClass('ss-circle-deco');
// set positions for each row
placeRows();
},
// defines a selector that gathers the row elems that are initially visible.
// the element is visible if its top is less than the window's height.
// these elements will not be affected when scrolling the page.
defineViewport= function() {
$.extend( $.expr[':'], {
inviewport: function ( el ) {
if ( $(el).offset().top < winSize.height ) {
return true;
}
return false;
}
});
},
// checks which rows are initially visible
setViewportRows= function() {
$rowsViewport = $rows.filter(':inviewport');
$rowsOutViewport= $rows.not( $rowsViewport )
},
// get window sizes
getWinSize= function() {
winSize.width= $win.width();
winSize.height= $win.height();
},
// initialize some events
initEvents= function() {
// navigation menu links.
// scroll to the respective section.
$links.on( 'click.Scrolling', function( event ) {
// scroll to the element that has id = menu's href
$('html, body').stop().animate({
scrollTop: $( $(this).attr('href') ).offset().top
}, scollPageSpeed, scollPageEasing );
return false;
});
$(window).on({
// on window resize we need to redefine which rows are initially visible (this ones we will not animate).
'resize.Scrolling' : function( event ) {
// get the window sizes again
getWinSize();
// redefine which rows are initially visible (:inviewport)
setViewportRows();
// remove pointers for every row
$rows.find('a.ss-circle').removeClass('ss-circle-deco');
// show inviewport rows and respective pointers
$rowsViewport.each( function() {
$(this).find('div.ss-left')
.css({ left : '0%' })
.end()
.find('div.ss-right')
.css({ right : '0%' })
.end()
.find('a.ss-circle')
.addClass('ss-circle-deco');
});
},
// when scrolling the page change the position of each row
'scroll.Scrolling' : function( event ) {
// set a timeout to avoid that the
// placeRows function gets called on every scroll trigger
if( anim ) return false;
anim = true;
setTimeout( function() {
placeRows();
anim = false;
}, 10 );
}
});
},
// sets the position of the rows (left and right row elements).
// Both of these elements will start with -50% for the left/right (not visible)
// and this value should be 0% (final position) when the element is on the
// center of the window.
placeRows= function() {
// how much we scrolled so far
var winscroll= $win.scrollTop(),
// the y value for the center of the screen
winCenter= winSize.height / 2 + winscroll;
// for every row that is not inviewport
$rowsOutViewport.each( function(i) {
var $row= $(this),
// the left side element
$rowL= $row.find('div.ss-left'),
// the right side element
$rowR= $row.find('div.ss-right'),
// top value
rowT= $row.offset().top;
// hide the row if it is under the viewport
if( rowT > winSize.height + winscroll ) {
if( perspective ) {
$rowL.css({
'-webkit-transform': 'translate3d(-75%, 0, 0) rotateY(-90deg) translate3d(-75%, 0, 0)',
'opacity': 0
});
$rowR.css({
'-webkit-transform': 'translate3d(75%, 0, 0) rotateY(90deg) translate3d(75%, 0, 0)',
'opacity': 0
});
}
else {
$rowL.css({ left : '-50%' });
$rowR.css({ right : '-50%' });
}
}
// if not, the row should become visible (0% of left/right) as it gets closer to the center of the screen.
else {
// row's height
var rowH= $row.height(),
// the value on each scrolling step will be proporcional to the distance from the center of the screen to its height
factor = ( ( ( rowT + rowH / 2 ) - winCenter ) / ( winSize.height / 2 + rowH / 2 ) ),
// value for the left / right of each side of the row.
// 0% is the limit
val= Math.max( factor * 50, 0 );
if( val <= 0 ) {
// when 0% is reached show the pointer for that row
if( !$row.data('pointer') ) {
$row.data( 'pointer', true );
$row.find('.ss-circle').addClass('ss-circle-deco');
}
}
else {
// the pointer should not be shown
if( $row.data('pointer') ) {
$row.data( 'pointer', false );
$row.find('.ss-circle').removeClass('ss-circle-deco');
}
}
// set calculated values
if( perspective ) {
vart= Math.max( factor * 75, 0 ),
r= Math.max( factor * 90, 0 ),
o= Math.min( Math.abs( factor - 1 ), 1 );
$rowL.css({
'-webkit-transform': 'translate3d(-' + t + '%, 0, 0) rotateY(-' + r + 'deg) translate3d(-' + t + '%, 0, 0)',
'opacity': o
});
$rowR.css({
'-webkit-transform': 'translate3d(' + t + '%, 0, 0) rotateY(' + r + 'deg) translate3d(' + t + '%, 0, 0)',
'opacity': o
});
}
else {
$rowL.css({ left : - val + '%' });
$rowR.css({ right : - val + '%' });
}
}
});
};
return { init : init };
})();
$sidescroll.init();
});