javascript - jQuery Uncaught TypeError: Cannot read property 'top' of undefined -

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i keep getting following error : uncaught typeerror: cannot read property 'top' of undefined

the issue relates line: posy = pos.top - $(window).scrolltop(),

although it's not damaging bit of pain see.

i have tried contents using : var postest = inf.offset().top; ends happening instead offset error.

any ideas appreciated.

$(document).on("mouseenter", ":has('.infotip.ifixed')", function() {    var inf = $(".infotip.ifixed");    if (inf.length) {      var itheight = $(this).children(".infotip").innerheight(),        pos = $(this).children(".infotip").parent().offset(),        posy = pos.top - $(window).scrolltop(),        posx = (pos.left - $(window).scrollleft()) + 190,        accuheight = (posy - itheight) + 150,        divpos = {          left: posx,          top: accuheight        };      $(this).find(".infotip.ifixed").css(divpos);    }  });

my definition inf wrong.

$(document).on("mouseenter", ":has('.infotip.ifixed')", function() {        var inf = $(this).children(".infotip").parent();        if (inf.length) {      var postesty = inf.offset().top,        postestx = inf.offset().top;            var itheight = $(this).children(".infotip").innerheight(),        posy = postesty - $(window).scrolltop(),        posx = (postestx - $(window).scrollleft()) + 190,        accuheight = (posy - itheight) + 150,        divpos = {          left: posx,          top: accuheight        };            $(this).find(".infotip.ifixed").css(divpos);    }  });


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