Удалить: целевые стили на свитке - PullRequest
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Удалить: целевые стили на свитке

0 голосов
/ 29 октября 2018

Я добавил следующее, чтобы обеспечить плавную прокрутку для ссылок привязки. Стили: target: before должны быть смещены для липкого заголовка: 

html {
    scroll-behavior: smooth;
}
:target:before {
    content:' ';
    display: block;
    height: 65px;
}

Это прекрасно работает, но оставляет разрыв 65px, если вы прокрутите страницу вверх. Я хочу удалить стили :target:before после повторной прокрутки.

Я попробовал следующее безрезультатно: 

$(window).scroll(function() {
    $(':target:before').hide();
});

Есть какие-нибудь идеи относительно хорошего решения для этого? 

$('a').on('click', function() {
  var anchorLink = $('a').attr('href');
  $(anchorLink).addClass('activeAnchor');
  $(window).on('keyup DOMMouseScroll', function(e) {
    if( e.which == 33     // page up 
     || e.which == 34     // page dn 
     || e.which == 32     // spacebar
     || e.which == 38     // up 
     || e.which == 40     // down 
     || (e.ctrlKey && e.which == 36)     // ctrl + home 
     || (e.ctrlKey && e.which == 35)     // ctrl + end 
     || e.type == 'DOMMouseScroll' ) 
    {
    $(anchorLink).removeClass('activeAnchor');
    }
  });
});
header {
  position: fixed;
  height: 50px;
  background: #000;
  opacity: .75;
  color: #fff;
  width: 100%;
}

html {
  scroll-behavior: smooth;
}

.activeAnchor:before {
  content: ' ';
  display: block;
  height: 65px;
}
<!DOCTYPE html>
<html>

<body>
  <header>HEADER</header>
  <div style="padding-top:70px;">
    <h1>My First Heading</h1>
    <p><a href="#anchor" class="anchor">Anchor Link</a></p>
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
      has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown
      printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release
      of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
    <h2 id="anchor">Anchor.</h2>
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
      has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown
      printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release
      of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
      has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown
      printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release
      of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
      has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown
      printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release
      of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
  </div>
</body>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

</html>

Ответы [ 3 ]

0 голосов
/ 01 ноября 2018

Переопределить свойство вручную: 

$(window).scroll(function() {
  $(':target::before').css('height', '0px');
});
0 голосов
/ 01 ноября 2018

Обратите внимание, что вы не можете выбрать псевдоэлементы , используя JavaScript или jQuery. Узнать больше

Однако, , вы можете достичь желаемого результата, используя классы CSS. Например, вы можете использовать класс inactive: 

:target.inactive:before {
  display: none;
}

Добавлять класс inactive к элементам :target всякий раз, когда пользователь прокручивает вручную . И удалите его, когда пользователь нажимает на любом из якорей. 

$(window).on('DOMMouseScroll', function() {
  $(':target').addClass('inactive');
}); // a more effective event listener is provided in the code for *Manual Scroll*

$('a').on('click', function() {
  $(':target').removeClass('inactive');
});

Приведенный выше трюк будет выполнять ту же функцию, что и функция .hide() в jQuery.

Это было проверено в Chrome v70 и Firefox Quantum v63 с успешными результатами! 

$(window).on('keyup DOMMouseScroll', function(e) {
  if( e.which == 33     // page up 
   || e.which == 34     // page dn 
   || e.which == 32     // spacebar
   || e.which == 38     // up 
   || e.which == 40     // down 
   || (e.ctrlKey && e.which == 36)     // ctrl + home 
   || (e.ctrlKey && e.which == 35)     // ctrl + end 
   || e.type == 'DOMMouseScroll' ) 
  {
    $(':target').addClass('inactive');
  }
});

$('a').on('click', function() {
  $(':target').removeClass('inactive');
});
header {
  position: fixed;
  height: 50px;
  background: #000;
  opacity: .75;
  color: #fff;
  width: 100%;
}

html {
  scroll-behavior: smooth;
}

:target:before {
  content: ' ';
  display: block;
  height: 65px;
}

:target.inactive:before {
  display: none;
}
<!DOCTYPE html>
<html>

<body>
  <header>HEADER</header>
  <div style="padding-top:70px;">
    <h1>My First Heading</h1>
    <p><a href="#anchor">Anchor Link</a></p>
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
      has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown
      printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release
      of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
    <h2 id="anchor">Anchor.</h2>
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
      has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown
      printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release
      of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
      has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown
      printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release
      of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
      has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown
      printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release
      of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
  </div>
</body>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

</html>
0 голосов
/ 30 октября 2018

Надеюсь, это поможет. Использование «: target» работает только при втором щелчке, поэтому это может быть не идеально. Приведенный ниже пример может привести вас к решению с дальнейшей доработкой. 

$('a[href^="#"]').on('click', function() {
  $('h2').addClass('youAreHere');
});


$(window).on('scroll', function() {
  var scrollUp = $(window).scrollTop();
  var rightHere = $('.youAreHere').length;
  var offTop = $('h2').offset().top;
  var offHgt = $('h2').height();

  if (scrollUp >= offTop + offHgt && rightHere) {
    $('h2').removeClass('youAreHere');
  }
});
/* Just for testing in SO snippet*/

body {
  min-height: 800px;
}

header {
  position: fixed;
  height: 50px;
  background: #000;
  opacity: .75;
  color: #fff;
  width: 100%;
}

html {
  scroll-behavior: smooth;
}

.youAreHere:target::before {
  content: ' ';
  display: block;
  height: 65px;
  border: 2px solid red;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<header>HEADER</header>
<div style="padding-top:70px;">
  <h1>My First Heading</h1>
  <p><a href="#anchor">Anchor Link 1</a></p>
  <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
    has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
    publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer
    took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset
    sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
  <h2 id="anchor">Anchor.</h2>
  <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
    has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
    publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer
    took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset
    sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
  <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
    has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
    publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer
    took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset
    sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
  <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
    has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
    publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer
    took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset
    sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>

</div>
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