jquery - Add some px to a "scroll to position" function -


i have fixed header bar works anchor links scroll through page. links header bar gets active if on position. basicially active class comes 75px late, because fixed header 75 px height.

how can add px function compensate that?

$(document).ready(function () {      $(document).on("scroll", onscroll);            //smoothscroll      $('a[href^="#"]').on('click', function (e) {          e.preventdefault();          $(document).off("scroll");                    $('a').each(function () {              $(this).removeclass('active');          })          $(this).addclass('active');                  var target = this.hash,              menu = target;          $target = $(target);          $('html, body').stop().animate({              'scrolltop': $target.offset().top+2          }, 500, 'swing', function () {              window.location.hash = target;              $(document).on("scroll", onscroll);          });      });  });    function onscroll(event){      var scrollpos = $(document).scrolltop();      $('#menu-center a').each(function () {          var currlink = $(this);          var refelement = $(currlink.attr("href"));          if (refelement.position().top <= scrollpos && refelement.position().top + refelement.height() > scrollpos) {              $('#menu-center ul li a').removeclass("active");              currlink.addclass("active");          }          else{              currlink.removeclass("active");          }      });  }
body, html {      margin: 0;      padding: 0;      height: 100%;      width: 100%;  }  .menu {      width: 100%;      height: 75px;      background-color: rgba(0, 0, 0, 1);      position: fixed;      background-color:rgba(4, 180, 49, 0.6);      -webkit-transition: 0.3s ease;      -moz-transition: 0.3s ease;      -o-transition: 0.3s ease;      transition: 0.3s ease;  }  .light-menu {      width: 100%;      height: 75px;      background-color: rgba(255, 255, 255, 1);      position: fixed;      background-color:rgba(4, 180, 49, 0.6);      -webkit-transition: 0.3s ease;      -moz-transition: 0.3s ease;      -o-transition: 0.3s ease;      transition: 0.3s ease;  }  #menu-center {      width: 980px;      height: 75px;      margin: 0 auto;  }  #menu-center ul {      margin: 15px 0 0 0;  }  #menu-center ul li {      list-style: none;      margin: 0 30px 0 0;      display: inline;  }  .active {      font-family:'droid sans', serif;      font-size: 14px;      color: #fff;      text-decoration: none;      line-height: 50px;  }  {      font-family:'droid sans', serif;      font-size: 14px;      color: black;      text-decoration: none;      line-height: 50px;  }  #home {      background-color: grey;      height: 100%;      width: 100%;      overflow: hidden;      background-image: url(images/home-bg2.png);  }  #portfolio {      background-image: url(images/portfolio-bg.png);      height: 100%;      width: 100%;  }  #about {      background-color: blue;      height: 100%;      width: 100%;  }  #contact {      background-color: red;      height: 100%;      width: 100%;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <div class="m1 menu">      <div id="menu-center">          <ul>              <li><a class="active" href="#home">home</a>                </li>              <li><a href="#portfolio">portfolio</a>                </li>              <li><a href="#about">about</a>                </li>              <li><a href="#contact">contact</a>                </li>          </ul>      </div>  </div>  <div id="home"></div>  <div id="portfolio"></div>  <div id="about"></div>  <div id="contact"></div>

if understood correctly guess need compensate following line:

var scrollpos = $(document).scrolltop() + $("#menu-center").height(); //adjusting scrollpos per menu height 

$(document).ready(function() {    $(document).on("scroll", onscroll);      //smoothscroll    $('a[href^="#"]').on('click', function(e) {      e.preventdefault();      $(document).off("scroll");        $('a').each(function() {        $(this).removeclass('active');      })      $(this).addclass('active');        var target = this.hash,        menu = target;      $target = $(target);      $('html, body').stop().animate({        'scrolltop': $target.offset().top + 2      }, 500, 'swing', function() {        window.location.hash = target;        $(document).on("scroll", onscroll);      });    });  });    function onscroll(event) {    var scrollpos = $(document).scrolltop() + $("#menu-center").height(); //adjusting scrollpos per menu height        $('#menu-center a').each(function() {      var currlink = $(this);      var refelement = $(currlink.attr("href"));      if (refelement.position().top <= scrollpos && refelement.position().top + refelement.height() > (scrollpos)) {        $('#menu-center ul li a').removeclass("active");        currlink.addclass("active");      } else {        currlink.removeclass("active");      }    });  }
body,  html {    margin: 0;    padding: 0;    height: 100%;    width: 100%;  }  .menu {    width: 100%;    height: 75px;    background-color: rgba(0, 0, 0, 1);    position: fixed;    background-color: rgba(4, 180, 49, 0.6);    -webkit-transition: 0.3s ease;    -moz-transition: 0.3s ease;    -o-transition: 0.3s ease;    transition: 0.3s ease;  }  .light-menu {    width: 100%;    height: 75px;    background-color: rgba(255, 255, 255, 1);    position: fixed;    background-color: rgba(4, 180, 49, 0.6);    -webkit-transition: 0.3s ease;    -moz-transition: 0.3s ease;    -o-transition: 0.3s ease;    transition: 0.3s ease;  }  #menu-center {    width: 980px;    height: 75px;    margin: 0 auto;  }  #menu-center ul {    margin: 15px 0 0 0;  }  #menu-center ul li {    list-style: none;    margin: 0 30px 0 0;    display: inline;  }  .active {    font-family: 'droid sans', serif;    font-size: 14px;    color: #fff;    text-decoration: none;    line-height: 50px;  }  {    font-family: 'droid sans', serif;    font-size: 14px;    color: black;    text-decoration: none;    line-height: 50px;  }  #home {    background-color: grey;    height: 100%;    width: 100%;    overflow: hidden;    background-image: url(images/home-bg2.png);  }  #portfolio {    background-image: url(images/portfolio-bg.png);    height: 100%;    width: 100%;  }  #about {    background-color: blue;    height: 100%;    width: 100%;  }  #contact {    background-color: red;    height: 100%;    width: 100%;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <div class="m1 menu">    <div id="menu-center">      <ul>        <li><a class="active" href="#home">home</a>          </li>        <li><a href="#portfolio">portfolio</a>          </li>        <li><a href="#about">about</a>          </li>        <li><a href="#contact">contact</a>          </li>      </ul>    </div>  </div>  <div id="home"></div>  <div id="portfolio"></div>  <div id="about"></div>  <div id="contact"></div>


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