jQuery scroll to section.js

document.querySelectorAll('a[href^="#"]').forEach(function (el) {
	el.onclick = function (e) {
		e.preventDefault();
		var hash = this.getAttribute('href');
		var target = document.querySelector(hash);
		var headerOffset = 100;
		var elementPosition = target.offsetTop;
		var offsetPosition = elementPosition - headerOffset;
		window.scrollTo({
			top: offsetPosition,
			behavior: 'smooth'
		});
	};
});


// Navs and blocks must be linked with ancors

$(document).on('click', 'a[href^="#"]', function (e) {
  e.preventDefault();
  var headerHeight = $('.site-header').outerHeight();
  var elementClick = $(this).attr('href');

  if ($(elementClick).length != 0) { // проверка существования элемента
    var destination = $(elementClick).offset().top - headerHeight;
    $('html, body').animate({ scrollTop: destination }, 500);
  }
});


// Scroll to block
$('.header-nav a').on('click', function () {

  var headerHeight = $('.page-header').outerHeight();
  var elementClick = $(this).attr('href');
  
  if ($(elementClick).length != 0) { // проверка существования элемента
    var destination = $(elementClick).offset().top - headerHeight;
    $('html, body').animate({ scrollTop: destination }, 1000);
  }
  return false; 
});


//Another script
$(document).on('click', 'a[href*=\\#]', function() {
  var headerHeight = $('.page-header').outerHeight();
  if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {
    var target = $(this.hash);
    target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
    if (target.length) {
      $('html,body').animate({
        scrollTop: (target.offset().top - headerHeight)
      }, 1000);
      return false;
    }
  }
});

//Another one
$('.main-menu a').on('click', function () {
  var el = $(this);
  var dest = el.attr('href'); 
  if (dest !== undefined && dest !== '') { 
    $('html').animate({ scrollTop: $(dest).offset().top  }, 500);
  }
  return false;
});