3 lines
1.0 KiB
JavaScript
3 lines
1.0 KiB
JavaScript
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/* jquery.scrollzer v0.2 | (c) @ajlkn | MIT licensed */
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jQuery.scrollzer=function(e,t){var r=jQuery(window),a=jQuery(document);r.load(function(){var i,o,s,l,n,c,u=jQuery.extend({activeClassName:"active",suffix:"-link",pad:50,firstHack:!1,lastHack:!1},t),d=[],f=jQuery();for(i in e)s=jQuery("#"+e[i]),l=jQuery("#"+e[i]+u.suffix),s.length<1||l.length<1||(o={},o.link=l,o.object=s,d[e[i]]=o,f=f.add(l));var v,h=function(){var e;for(i in d)e=d[i],e.start=Math.ceil(e.object.offset().top)-u.pad,e.end=e.start+Math.ceil(e.object.innerHeight());r.trigger("scroll")};r.resize(function(){window.clearTimeout(v),v=window.setTimeout(h,250)});var j,m=function(){f.removeClass("scrollzer-locked")};r.scroll(function(e){var t=0,o=!1;n=r.scrollTop(),window.clearTimeout(j),j=window.setTimeout(m,250);for(i in d)i!=c&&n>=d[i].start&&n<=d[i].end&&(c=i,o=!0),t++;u.lastHack&&n+r.height()>=a.height()&&(c=i,o=!0),o&&!f.hasClass("scrollzer-locked")&&(f.removeClass(u.activeClassName),d[c].link.addClass(u.activeClassName))}),r.trigger("resize")})};
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