jQuery随动窗口插件 scrollFollow

jquery 实现的页面滚动时浮动窗口控件 1. Introduction: 这个控件能够实现的效果是当你的页面滚动时,某个DIV永远停留在你需要它停留的位置。同时可以为这个DIV设定个容器,当滚动条已经超过了这个容器,那么这个DIV就不再滚动了。 有时候如果需要做个比较好用的导航条,使用这个控件挺不错的。 2. Code & Properties: 这个js文件是在jQuery和jquery ui的核心上扩展的。所以使用它前你必须到jQuery的官网下载那两个js文件,jquery.js和ui.core.js。 整个javascript如下: ( function( $ ) { $.scrollFollow = function ( box, options ) { // Convert box into a jQuery object box = $( box ); // 'box' is the object to be animated var position = box.css( 'position' ); function ani() { // The script runs on every scroll which really means many times during a scroll. // We don't want multiple slides to queue up. box.queue( [ ] ); // A bunch of values we need to determine where to animate to var viewportHeight = parseInt( $( window ).height() ); var pageScroll = parseInt( $( document ).scrollTop() ); var parentTop = parseInt( box.cont.offset().top ); var parentHeight = parseInt( box.cont.attr( 'offsetHeight' ) ); var boxHeight = parseInt( box.attr( 'offsetHeight' ) + ( parseInt( box.css( 'marginTop' ) ) || 0 ) + ( parseInt( box.css( 'marginBottom' ) ) || 0 ) ); var aniTop; // Make sure the user wants the animation to happen if ( isActive ) { // If the box should animate relative to the top of the window if ( options.relativeTo == 'top' ) { // Don't animate until the top of the window is close enough to the top of the box if ( box.initialOffsetTop >= ( pageScroll + options.offset ) ) { aniTop = box.initialTop; } else { aniTop = Math.min( ( Math.max( ( -parentTop ), ( pageScroll - box.initialOffsetTop + box.initialTop ) ) + options.offset ), ( parentHeight - boxHeight - box.paddingAdjustment ) ); } } // If the box should animate relative to the bottom of the window else if ( options.relativeTo == 'bottom' ) { // Don't animate until the bottom of the window is close enough to the bottom of the box if ( ( box.initialOffsetTop + boxHeight ) >= ( pageScroll + options.offset + viewportHeight ) ) { aniTop = box.initialTop; } else { aniTop = Math.min( ( pageScroll + viewportHeight - boxHeight - options.offset ), ( parentHeight - boxHeight ) ); } } // Checks to see if the relevant scroll was the last one // "-20" is to account for inaccuracy in the timeout if ( ( new Date().getTime() - box.lastScroll ) >= ( options.delay - 20 ) ) { box.animate( { top: aniTop }, options.speed, options.easing ); } } }; // For user-initiated stopping of the slide var isActive = true; if ( $.cookie != undefined ) { if( $.cookie( 'scrollFollowSetting' + box.attr( 'id' ) ) == 'false' ) { var isActive = false; $( '#' + options.killSwitch ).text( options.offText ) .toggle( function () { isActive = true; $( this ).text( options.onText ); $.cookie( 'scrollFollowSetting' + box.attr( 'id' ), true, { expires: 365, path: '/'} ); ani(); }, function () { isActive = false; $( this ).text( options.offText ); box.animate( { top: box.initialTop }, options.speed, options.easing ); $.cookie( 'scrollFollowSetting' + box.attr( 'id' ), false, { expires: 365, path: '/'} ); } ); } else { $( '#' + options.killSwitch ).text( options.onText ) .toggle( function () { isActive = false; $( this ).text( options.offText ); box.animate( { top: box.initialTop }, 0 ); $.cookie( 'scrollFollowSetting' + box.attr( 'id' ), false, { expires: 365, path: '/'} ); }, function () { isActive = true; $( this ).text( options.onText ); $.cookie( 'scrollFollowSetting' + box.attr( 'id' ), true, { expires: 365, path: '/'} ); ani(); } ); } } // If no parent ID was specified, and the immediate parent does not have an ID // options.container will be undefined. So we need to figure out the parent element. if ( options.container == '') { box.cont = box.parent(); } else { box.cont = $( '#' + options.container ); } // Finds the default positioning of the box. box.initialOffsetTop = parseInt( box.offset().top ); box.initialTop = parseInt( box.css( 'top' ) ) || 0; // Hack to fix different treatment of boxes positioned 'absolute' and 'relative' if ( box.css( 'position' ) == 'relative' ) { box.paddingAdjustment = parseInt( box.cont.css( 'paddingTop' ) ) + parseInt( box.cont.css( 'paddingBottom' ) ); } else { box.paddingAdjustment = 0; } // Animate the box when the page is scrolled $( window ).scroll( function () { // Sets up the delay of the animation $.fn.scrollFollow.interval = setTimeout( function(){ ani();} , options.delay ); // To check against right before setting the animation box.lastScroll = new Date().getTime(); } ); // Animate the box when the page is resized $( window ).resize( function () { // Sets up the delay of the animation $.fn.scrollFollow.interval = setTimeout( function(){ ani();} , options.delay ); // To check against right before setting the animation box.lastScroll = new Date().getTime(); } ); // Run an initial animation on page load box.lastScroll = 0; ani(); }; $.fn.scrollFollow = function ( options ) { options = options || {}; options.relativeTo = options.relativeTo || 'top'; options.speed = options.speed || 1; options.offset = options.offset || 0; options.easing = options.easing || 'swing'; options.container = options.container || this.parent().attr( 'id' ); options.killSwitch = options.killSwitch || 'killSwitch'; options.onText = options.onText || 'Turn Slide Off'; options.offText = options.offText || 'Turn Slide On'; options.delay = options.delay || 0; this.each( function() { new $.scrollFollow( this, options ); } ); return this; }; })( jQuery ); 这里面有几个参数可以设置效果: 上面图示是用来设定这个DIV在滚动后的位置会在哪里。 而所有的动画效果参数设置如下: 那么如何在HTML或者是其它的页面中使用呢? <script type="text/javascript"><!-- $( document ).ready( function () { $( '#example' ).scrollFollow(); } ); // --></script> 最后是设置ID为example这个DIV的Css样式,需要注意的是position必须设定为relative,如下例: #example { position: relative; width: 220px; margin: 5px; padding: 10px; background: #DDDDDD; border: 1px solid #42CBDC; }

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