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76 lines
3.6 KiB
JavaScript
76 lines
3.6 KiB
JavaScript
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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:1000, fadeduration:[500, 100]},
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controlHTML: top_image_html,//set in inc_top.tmpl so it can be $sbRooted
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controlattrs: {offsetx:5, offsety:5}, //offset of control relative to right/ bottom of window corner
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anchorkeyword: '#top', //Enter href value of HTML anchors on the page that should also act as "Scroll Up" links
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state: {isvisible:false, shouldvisible:false},
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scrollup:function(){
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if (!this.cssfixedsupport) //if control is positioned using JavaScript
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this.$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=$('<div id="topcontrol">'+mainobj.controlHTML+'</div>')
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.css({position:mainobj.cssfixedsupport? 'fixed' : 'absolute', bottom:mainobj.controlattrs.offsety, right:mainobj.controlattrs.offsetx, opacity:0, cursor:'pointer'})
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.attr({title:'Scroll to Top'})
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.click(function(){mainobj.scrollup(); return false})
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.appendTo('body')
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if (document.all && !window.XMLHttpRequest && mainobj.$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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