有时候隐藏滚动条对于用户体验来说是一件非常不错的事情,当需要的时候才显示它。这款插件就是使用了 jScrollPane 和 jQuery 来实现这种滚动条显示和隐藏的美化效果。
如果你想了解更多关于 jScrollPane 的知识,请点击这里:jScrollPane – cross browser styleable scrollbars with jQuery and CSS。
<div id="jp-container" class="jp-container">
<!-- content -->
</div>
.jp-container{
width:500px;
height:400px;
position:relative;
background:#fff;
border:1px solid #D8DFEA;
float:left;
}
// the element we want to apply the jScrollPane
var $el = $('#jp-container').jScrollPane({
verticalGutter : -16
}),
// the extension functions and options
extensionPlugin = {
extPluginOpts : {
// speed for the fadeOut animation
mouseLeaveFadeSpeed : 500,
// scrollbar fades out after
// hovertimeout_t milliseconds
hovertimeout_t : 1000,
// if set to false, the scrollbar will
// be shown on mouseenter and hidden on
// mouseleave
// if set to true, the same will happen,
// but the scrollbar will be also hidden
// on mouseenter after "hovertimeout_t" ms
// also, it will be shown when we start to
// scroll and hidden when stopping
useTimeout : false,
// the extension only applies for devices
// with width > deviceWidth
deviceWidth : 980
},
hovertimeout : null,
// timeout to hide the scrollbar
isScrollbarHover: false,
// true if the mouse is over the scrollbar
elementtimeout : null,
// avoids showing the scrollbar when moving
// from inside the element to outside, passing
// over the scrollbar
isScrolling : false,
// true if scrolling
addHoverFunc : function() {
// run only if the window has a width bigger than deviceWidth
if( $(window).width() <= this.extPluginOpts.deviceWidth ) return false;
var instance = this;
// functions to show / hide the scrollbar
$.fn.jspmouseenter = $.fn.show;
$.fn.jspmouseleave = $.fn.fadeOut;
// hide the jScrollPane vertical bar
var $vBar = this.getContentPane().siblings('.jspVerticalBar').hide();
/*
* mouseenter / mouseleave events on the main element
* also scrollstart / scrollstop
* @James Padolsey : http://james.padolsey.com/javascript/special-scroll-events-for-jquery/
*/
$el.bind('mouseenter.jsp',function() {
// show the scrollbar
$vBar.stop( true, true ).jspmouseenter();
if( !instance.extPluginOpts.useTimeout ) return false;
// hide the scrollbar after hovertimeout_t ms
clearTimeout( instance.hovertimeout );
instance.hovertimeout = setTimeout(function() {
// if scrolling at the moment don't hide it
if( !instance.isScrolling )
$vBar.stop( true, true ).jspmouseleave( instance.extPluginOpts.mouseLeaveFadeSpeed || 0 );
}, instance.extPluginOpts.hovertimeout_t );
}).bind('mouseleave.jsp',function() {
// hide the scrollbar
if( !instance.extPluginOpts.useTimeout )
$vBar.stop( true, true ).jspmouseleave( instance.extPluginOpts.mouseLeaveFadeSpeed || 0 );
else {
clearTimeout( instance.elementtimeout );
if( !instance.isScrolling )
$vBar.stop( true, true ).jspmouseleave( instance.extPluginOpts.mouseLeaveFadeSpeed || 0 );
}
});
if( this.extPluginOpts.useTimeout ) {
$el.bind('scrollstart.jsp', function() {
// when scrolling show the scrollbar
clearTimeout( instance.hovertimeout );
instance.isScrolling = true;
$vBar.stop( true, true ).jspmouseenter();
}).bind('scrollstop.jsp', function() {
// when stop scrolling hide the
// scrollbar (if not hovering it at the moment)
clearTimeout( instance.hovertimeout );
instance.isScrolling = false;
instance.hovertimeout = setTimeout(function() {
if( !instance.isScrollbarHover )
$vBar.stop( true, true ).jspmouseleave( instance.extPluginOpts.mouseLeaveFadeSpeed || 0 );
}, instance.extPluginOpts.hovertimeout_t );
});
// wrap the scrollbar
// we need this to be able to add
// the mouseenter / mouseleave events
// to the scrollbar
var $vBarWrapper = $('<div/>').css({
position : 'absolute',
left : $vBar.css('left'),
top : $vBar.css('top'),
right : $vBar.css('right'),
bottom : $vBar.css('bottom'),
width : $vBar.width(),
height : $vBar.height()
}).bind('mouseenter.jsp',function() {
clearTimeout( instance.hovertimeout );
clearTimeout( instance.elementtimeout );
instance.isScrollbarHover = true;
// show the scrollbar after 100 ms.
// avoids showing the scrollbar when moving
// from inside the element to outside,
// passing over the scrollbar
instance.elementtimeout = setTimeout(function() {
$vBar.stop( true, true ).jspmouseenter();
}, 100 );
}).bind('mouseleave.jsp',function() {
// hide the scrollbar after hovertimeout_t
clearTimeout( instance.hovertimeout );
instance.isScrollbarHover = false;
instance.hovertimeout = setTimeout(function() {
// if scrolling at the moment
// don't hide it
if( !instance.isScrolling )
$vBar.stop( true, true ).jspmouseleave( instance.extPluginOpts.mouseLeaveFadeSpeed || 0 );
}, instance.extPluginOpts.hovertimeout_t );
});
$vBar.wrap( $vBarWrapper );
}
}
},
// the jScrollPane instance
jspapi = $el.data('jsp');
// extend the jScollPane by merging
$.extend( true, jspapi, extensionPlugin );
jspapi.addHoverFunc();
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