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- //** jQuery Scroll to Top Control script- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com.
- //** Available/ usage terms at http://www.dynamicdrive.com (March 30th, 09')
- //** v1.1 (April 7th, 09'):
- //** 1) Adds ability to scroll to an absolute position (from top of page) or specific element on the page instead.
- //** 2) Fixes scroll animation not working in Opera.
- var scrolltotop={
- //startline: Integer. Number of pixels from top of doc scrollbar is scrolled before showing control
- //scrollto: Keyword (Integer, or "Scroll_to_Element_ID"). How far to scroll document up when control is clicked on (0=top).
- setting: {startline:100, scrollto: 0, scrollduration:1000, fadeduration:[500, 100]},
- controlHTML: '<img src="http://wilson.com.sapo.pt/inove/gotop.gif" style="width:29px; height:20px" />', //HTML for control, which is auto wrapped in DIV w/ ID="topcontrol"
- controlattrs: {offsetx:5, offsety:5}, //offset of control relative to right/ bottom of window corner
- anchorkeyword: '#top', //Enter href value of HTML anchors on the page that should also act as "Scroll Up" links
- state: {isvisible:false, shouldvisible:false},
- scrollup:function(){
- if (!this.cssfixedsupport) //if control is positioned using JavaScript
- this.$control.css({opacity:0}) //hide control immediately after clicking it
- var dest=isNaN(this.setting.scrollto)? this.setting.scrollto : parseInt(this.setting.scrollto)
- if (typeof dest=="string" && jQuery('#'+dest).length==1) //check element set by string exists
- dest=jQuery('#'+dest).offset().top
- else
- dest=0
- this.$body.animate({scrollTop: dest}, this.setting.scrollduration);
- },
- keepfixed:function(){
- var $window=jQuery(window)
- var controlx=$window.scrollLeft() + $window.width() - this.$control.width() - this.controlattrs.offsetx
- var controly=$window.scrollTop() + $window.height() - this.$control.height() - this.controlattrs.offsety
- this.$control.css({left:controlx+'px', top:controly+'px'})
- },
- togglecontrol:function(){
- var scrolltop=jQuery(window).scrollTop()
- if (!this.cssfixedsupport)
- this.keepfixed()
- this.state.shouldvisible=(scrolltop>=this.setting.startline)? true : false
- if (this.state.shouldvisible && !this.state.isvisible){
- this.$control.stop().animate({opacity:1}, this.setting.fadeduration[0])
- this.state.isvisible=true
- }
- else if (this.state.shouldvisible==false && this.state.isvisible){
- this.$control.stop().animate({opacity:0}, this.setting.fadeduration[1])
- this.state.isvisible=false
- }
- },
- init:function(){
- jQuery(document).ready(function($){
- var mainobj=scrolltotop
- var iebrws=document.all
- mainobj.cssfixedsupport=!iebrws || iebrws && document.compatMode=="CSS1Compat" && window.XMLHttpRequest //not IE or IE7+ browsers in standards mode
- mainobj.$body=(window.opera)? (document.compatMode=="CSS1Compat"? $('html') : $('body')) : $('html,body')
- mainobj.$control=$('<div id="topcontrol">'+mainobj.controlHTML+'</div>')
- .css({position:mainobj.cssfixedsupport? 'fixed' : 'absolute', bottom:mainobj.controlattrs.offsety, right:mainobj.controlattrs.offsetx, opacity:0, cursor:'pointer'})
- .attr({title:'Scroll Back to Top'})
- .click(function(){mainobj.scrollup(); return false})
- .appendTo('body')
- if (document.all && !window.XMLHttpRequest && mainobj.$control.text()!='') //loose check for IE6 and below, plus whether control contains any text
- mainobj.$control.css({width:mainobj.$control.width()}) //IE6- seems to require an explicit width on a DIV containing text
- mainobj.togglecontrol()
- $('a[href="' + mainobj.anchorkeyword +'"]').click(function(){
- mainobj.scrollup()
- return false
- })
- $(window).bind('scroll resize', function(e){
- mainobj.togglecontrol()
- })
- })
- }
- }
- scrolltotop.init()
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