javascript - Class alert when section's top is equal or higher than main panel's top -


i have fixed panel content scrolled , separated divs. would, when content's div top reaches panel top, alert appear div's class.

each div has class <div class="section-proceso anc1"> (both classes included on each div start section- , anc, if needed ant new class can added)

live demo

i have tried things no result:

if ($("div[class^='anc']").offset().top >= $('.contentpanel').offset().top){    alert($(this).attr('class')); }

use this:

$(".contentpanel").scroll(function () {     $("div[class*='anc']").each(function() {         $this = $(this);         var topview = $('.contentpanel').offset().top;         var topelement = $this.offset().top;         if (topelement <= topview && !$(this).hasclass('appear')){             $(this).addclass('appear');             alert($(this).attr('class'));         }          if (topelement >= topview && $(this).hasclass('appear')){             $(this).removeclass('appear');             alert($(this).attr('class'));         }     }); });

you never see alert last section becuase mention "when content's div top reaches panel top, alert appear div's class." , top of last section never reaches top of panel.

note: appear class used prevent repeated alert on every scroll, see alert when reach section , when reach end of section appear class has been removed, see alert when reach section top or bottom , don't see repeated annoying alert when scroll section form down or reverse.

check jsfiddle demo


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