JAVASCRIPT   71

scroll.js

Guest on 29th August 2021 02:49:04 PM

  1.  
  2.  
  3.  
  4. /*SCROLL PLUGIN STARTS*/
  5.  
  6. //** jQuery Scroll to Top Control script- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com.
  7. //** Available/ usage terms at http://www.dynamicdrive.com (March 30th, 09')
  8. //** v1.1 (April 7th, 09'):
  9. //** 1) Adds ability to scroll to an absolute position (from top of page) or specific element on the page instead.
  10. //** 2) Fixes scroll animation not working in Opera.
  11.  
  12.  
  13. var scrolltotop={
  14.         //startline: Integer. Number of pixels from top of doc scrollbar is scrolled before showing control
  15.         //scrollto: Keyword (Integer, or "Scroll_to_Element_ID"). How far to scroll document up when control is clicked on (0=top).
  16.         setting: {startline:100, scrollto: 0, scrollduration:1200, fadeduration:[500, 100]},
  17.         controlHTML: '<div id="scrolltotop"></div>', //HTML for control, which is auto wrapped in DIV w/ ID="topcontrol"
  18.         controlattrs: {offsetx:0, offsety:0}, //offset of control relative to right/ bottom of window corner
  19.         anchorkeyword: '#top', //Enter href value of HTML anchors on the page that should also act as "Scroll Up" links
  20.  
  21.         state: {isvisible:false, shouldvisible:false},
  22.  
  23.         scrollup:function(){
  24.                 if (!this.cssfixedsupport) //if control is positioned using JavaScript
  25.                         this.$control.css({opacity:0}) //hide control immediately after clicking it
  26.                 var dest=isNaN(this.setting.scrollto)? this.setting.scrollto : parseInt(this.setting.scrollto)
  27.                 if (typeof dest=="string" && jQuery('#'+dest).length==1) //check element set by string exists
  28.                         dest=jQuery('#'+dest).offset().top
  29.                 else
  30.                         dest=0
  31.                 this.$body.animate({scrollTop: dest}, this.setting.scrollduration);
  32.         },
  33.  
  34.         keepfixed:function(){
  35.                 var $window=jQuery(window)
  36.                 var controlx=$window.scrollLeft() + $window.width() - this.$control.width() - this.controlattrs.offsetx
  37.                 var controly=$window.scrollTop() + $window.height() - this.$control.height() - this.controlattrs.offsety
  38.                 this.$control.css({left:controlx+'px', top:controly+'px'})
  39.         },
  40.  
  41.         togglecontrol:function(){
  42.                 var scrolltop=jQuery(window).scrollTop()
  43.                 if (!this.cssfixedsupport)
  44.                         this.keepfixed()
  45.                 this.state.shouldvisible=(scrolltop>=this.setting.startline)? true : false
  46.                 if (this.state.shouldvisible && !this.state.isvisible){
  47.                         this.$control.stop().animate({opacity:1}, this.setting.fadeduration[0])
  48.                         this.state.isvisible=true
  49.                 }
  50.                 else if (this.state.shouldvisible==false && this.state.isvisible){
  51.                         this.$control.stop().animate({opacity:0}, this.setting.fadeduration[1])
  52.                         this.state.isvisible=false
  53.                 }
  54.         },
  55.        
  56.         init:function(){
  57.                 jQuery(document).ready(function($){
  58.                         var mainobj=scrolltotop
  59.                         var iebrws=document.all
  60.                         mainobj.cssfixedsupport=!iebrws || iebrws && document.compatMode=="CSS1Compat" && window.XMLHttpRequest //not IE or IE7+ browsers in standards mode
  61.                         mainobj.$body=(window.opera)? (document.compatMode=="CSS1Compat"? $('html') : $('body')) : $('html,body')
  62.                         mainobj.$control=$('<div id="topcontrol">'+mainobj.controlHTML+'</div>')
  63.                                 .css({position:mainobj.cssfixedsupport? 'fixed' : 'absolute', bottom:mainobj.controlattrs.offsety, right:mainobj.controlattrs.offsetx, opacity:0, cursor:'pointer'})
  64.                                 .attr({title:''})
  65.                                 .click(function(){mainobj.scrollup(); return false})
  66.                                 .appendTo('body')
  67.                         if (document.all && !window.XMLHttpRequest && mainobj.$control.text()!='') //loose check for IE6 and below, plus whether control contains any text
  68.                                 mainobj.$control.css({width:mainobj.$control.width()}) //IE6- seems to require an explicit width on a DIV containing text
  69.                         mainobj.togglecontrol()
  70.                         $('a[href="' + mainobj.anchorkeyword +'"]').click(function(){
  71.                                 mainobj.scrollup()
  72.                                 return false
  73.                         })
  74.                         $(window).bind('scroll resize', function(e){
  75.                                 mainobj.togglecontrol()
  76.                         })
  77.                 })
  78.         }
  79. }
  80.  
  81. scrolltotop.init()
  82.  /*SCROLL PLUGIN ENDS*/

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