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- | //** jQuery Scroll to Top Control script- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com.
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- | //** Available/ usage terms at http://www.dynamicdrive.com (March 30th, 09')
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- | //** v1.1 (April 7th, 09'):
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- | //** 1) Adds ability to scroll to an absolute position (from top of page) or specific element on the page instead.
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- | //** 2) Fixes scroll animation not working in Opera.
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- | var scrolltotop={
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- | //startline: Integer. Number of pixels from top of doc scrollbar is scrolled before showing control
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- | //scrollto: Keyword (Integer, or "Scroll_to_Element_ID"). How far to scroll document up when control is clicked on (0=top).
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- | setting: {startline:100, scrollto: 0, scrollduration:500, fadeduration:[500, 100]},
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- | controlHTML: '<img src="https://static.igem.org/mediawiki/2014/9/9e/To-top.png" style="width:80px;height:auto;" />', //HTML for control, which is auto wrapped in DIV w/ ID="topcontrol"
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- | controlattrs: {offsetx:5, offsety:5}, //offset of control relative to right/ bottom of window corner
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- | anchorkeyword: '#top', //Enter href value of HTML anchors on the page that should also act as "Scroll Up" links
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- | state: {isvisible:false, shouldvisible:false},
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- |
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- | scrollup:function(){
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- | if (!this.cssfixedsupport) //if control is positioned using JavaScript
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- | this.$control.css({opacity:0}) //hide control immediately after clicking it
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- | var dest=isNaN(this.setting.scrollto)? this.setting.scrollto : parseInt(this.setting.scrollto)
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- | if (typeof dest=="string" && jQuery('#'+dest).length==1) //check element set by string exists
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- | dest=jQuery('#'+dest).offset().top
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- | else
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- | dest=0
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- | this.$body.animate({scrollTop: dest}, this.setting.scrollduration);
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- | },
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- | keepfixed:function(){
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- | var $window=jQuery(window)
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- | var controlx=$window.scrollLeft() + $window.width() - this.$control.width() - this.controlattrs.offsetx
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- | var controly=$window.scrollTop() + $window.height() - this.$control.height() - this.controlattrs.offsety
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- | this.$control.css({left:controlx+'px', top:controly+'px'})
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- | },
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- | togglecontrol:function(){
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- | var scrolltop=jQuery(window).scrollTop()
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- | if (!this.cssfixedsupport)
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- | this.keepfixed()
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- | this.state.shouldvisible=(scrolltop>=this.setting.startline)? true : false
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- | if (this.state.shouldvisible && !this.state.isvisible){
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- | this.$control.stop().animate({opacity:1}, this.setting.fadeduration[0])
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- | this.state.isvisible=true
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- | }
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- | else if (this.state.shouldvisible==false && this.state.isvisible){
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- | this.$control.stop().animate({opacity:0}, this.setting.fadeduration[1])
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- | this.state.isvisible=false
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- | }
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- | },
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- | init:function(){
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- | jQuery(document).ready(function($){
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- | var mainobj=scrolltotop
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- | var iebrws=document.all
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- | mainobj.cssfixedsupport=!iebrws || iebrws && document.compatMode=="CSS1Compat" && window.XMLHttpRequest //not IE or IE7+ browsers in standards mode
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- | mainobj.$body=(window.opera)? (document.compatMode=="CSS1Compat"? $('html') : $('body')) : $('html,body')
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- | mainobj.$control=$('<div id="topcontrol">'+mainobj.controlHTML+'</div>')
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- | .css({position:mainobj.cssfixedsupport? 'fixed' : 'absolute', bottom:mainobj.controlattrs.offsety, right:mainobj.controlattrs.offsetx, opacity:0, cursor:'pointer'})
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- | .attr({title:'Scroll Back to Top'})
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- | .click(function(){mainobj.scrollup(); return false})
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- | .appendTo('body')
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- | if (document.all && !window.XMLHttpRequest && mainobj.$control.text()!='') //loose check for IE6 and below, plus whether control contains any text
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- | mainobj.$control.css({width:mainobj.$control.width()}) //IE6- seems to require an explicit width on a DIV containing text
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- | mainobj.togglecontrol()
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- | $('a[href="' + mainobj.anchorkeyword +'"]').click(function(){
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- | mainobj.scrollup()
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- | return false
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- | })
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- | $(window).bind('scroll resize', function(e){
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- | mainobj.togglecontrol()
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- | })
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- | })
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- | }
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- | }
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- | scrolltotop.init()
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