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Forum » Tutoriale si Resurse (T&R) » T&R Java » Buton pentru scroll up java
Buton pentru scroll up java
GravediggerData: Joi, 2012-12-27, 1:44 AM | Mesaj # 1
Gravedigger
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Poate ca ati vazut pe website-ul nostru acel buton care apare cand esti in josul paginii si apasand pe el deruleaza pagina in sus.
Eu am sa va ofer script-urile necesare si un mic tutorial de instalare.
Acum nu trebuie decat sa urmati pasii:

1.Creati un fisier cu numele "up" si estensia .js.

2.Deschideti fisierul cu un editor text adaugati codul de mai jos si il salvati.
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:600, scrollto: 0, scrollduration:1000, fadeduration:[500, 100]},
       controlHTML: '<img src="http://floodofgames.ucoz.ro/Grafica/up_button.png" style="width:33px; height:33px" />', //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=$('<div id="topcontrol">'+mainobj.controlHTML+'</div>')
          .css({position:mainobj.cssfixedsupport? 'fixed' : 'absolute', bottom:mainobj.controlattrs.offsety, right:mainobj.controlattrs.offsetx, opacity:0, cursor:'pointer'})
          .attr({title:'Derulați inapoi sus'})
          .click(function(){mainobj.scrollup(); return false})
          .appendTo('body')
         if (document.all && !window.XMLHttpRequest && mainobj.$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()


3.Uploadati fisierul up.js in radacina site-ului.

4.Adaugati intre <head> si </head> urmatorul cod(Nu uitati sa inlocuiti textul "LINK CATRE FISIERUL up.js" cu link-ul catre fisierul up.js):
<script type="text/javascript" src="LINK CATRE FISIERUL up.js"></script>

Daca doriti sa inlocuiti imaginea butonului, gasiti in fisierul up.js pe randul 5 link-ul imaginii, nu trebuie decat sa il inlocuiti cu link-ul imaginii care o doriti.
 
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