javascript - how to solve this Jquery error? -


i have made jquery can see fiddle below: http://madaxedesign.co.uk/dev/test/ http://jsfiddle.net/x82mu/1/

code: 

$(document).ready(function() { var $root = $('html, body '); $('.scroll a').click(function(e) {     var href = $.attr(this, 'href');     $root.animate({         scrolltop: $(href).offset().top     }, 500, function () {         window.location.hash = href;     });     return false; });  // responsive menu  $(function() {     var pull        = $('#pull'),         menu        = $('nav ul'),         menuheight  = menu.height()      $(pull).on('click', function(e) {         e.preventdefault();         menu.slidetoggle();     });      $(window).resize(function(){         var w = $(window).width();         if(w > 320 && menu.is(':hidden')) {             menu.removeattr('style');         }     }); });   });

but pulls through error: uncaught typeerror: cannot read property 'top' of undefined

this preventing next piece of jquery work.

i wondering if let me know why, or give me solution?

many thanks

you trying selector href isn't there in many of menu items.

i.e:

    <li><a href="#">home</a></li>     <li><a href="#aboutus">about us</a></li>     <li><a href="#">portfolio</a></li>             <li><a href="#">contact us</a></li>

and 

$(href).offset().top //here offset() of empty jquery object undefined.

not issue can this.href instead $.attr(this, 'href')

try this:

 $('.scroll a').click(function(e) {     var href = $(this).attr("href"), $el = $(href), top=0; //default top 0        if($el.length)  //if there element matching href           top = $el.offset().top; //set top     $root.animate({         scrolltop: top //now scroll     }, 500, function () {         window.location.hash = href;     });     return false; });

fiddle


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