(function($) { $.scrollFollow = function ( box, options ) { box = $( box ); var position = box.css( 'position' ); function ani() { box.queue( [ ] ); 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; if ( isActive ) { if ( options.relativeTo == 'top' ) { 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 ) ); } } else if ( options.relativeTo == 'bottom' ) { if ( ( box.initialOffsetTop + boxHeight ) >= ( pageScroll + options.offset + viewportHeight ) ) { aniTop = box.initialTop; } else { aniTop = Math.min( ( pageScroll + viewportHeight - boxHeight - options.offset ), ( parentHeight - boxHeight ) ); } } if ( ( new Date().getTime() - box.lastScroll ) >= ( options.delay - 20 ) ) { box.animate( { top: aniTop }, options.speed, options.easing ); } } }; 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 ( options.container == '') { box.cont = box.parent(); } else { box.cont = $( '#' + options.container ); } box.initialOffsetTop =  parseInt( box.offset().top ); box.initialTop = parseInt( box.css( 'top' ) ) || 0; if ( box.css( 'position' ) == 'relative' ) { box.paddingAdjustment = parseInt( box.cont.css( 'paddingTop' ) ) + parseInt( box.cont.css( 'paddingBottom' ) ); } else { box.paddingAdjustment = 0; } $( window ).scroll( function () { $.fn.scrollFollow.interval = setTimeout( function(){ ani();} , options.delay ); box.lastScroll = new Date().getTime(); } ); $( window ).resize( function () { $.fn.scrollFollow.interval = setTimeout( function(){ ani();} , options.delay ); box.lastScroll = new Date().getTime(); } ); box.lastScroll = 0; ani(); }; $.fn.scrollFollow = function ( options ) { options = options || {}; options.relativeTo = options.relativeTo || 'top'; options.speed = options.speed || 500; 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 );