Utilisation de scrollIntoView avec un en-tête à position fixe

Question

J'ai un site dont l'en-tête est défini comme suit position: fixed . Sur une de mes pages, j'utilise scrollIntoView(true) sur un élément. Mon problème est que lorsque scrollIntoView est appelé, l'élément est positionné sous l'en-tête. Comment puis-je corriger ce problème pour que l'élément soit affiché juste en dessous de l'en-tête ?

J'utilise le framework Bootstrap et l'en-tête est stylé avec navbar navbar-fixed-top .

Answer 1

C'est un peu compliqué, mais voici une solution de rechange.

var node = 'select your element';
var yourHeight = 'height of your fixed header';

// scroll to your element
node.scrollIntoView(true);

// now account for fixed header
var scrolledY = window.scrollY;

if(scrolledY){
  window.scroll(0, scrolledY - yourHeight);
}

Edit :

Une solution de contournement moderne consiste à utiliser les CSS scroll-margin-top en combinaison avec la propriété :target sélecteur. Décrit en détail : https://www.bram.us/2020/03/01/prevent-content-from-being-hidden-underneath-a-fixed-header-by-using-scroll-margin-top/

Answer 2

Scroll-margin-top : $header-height ;

Pour les navigateurs modernes : définissez le paramètre scroll-margin-top au décalage supérieur souhaité, sur les éléments vers lesquels vous établissez un lien ou un défilement. (elle aurait probablement dû s'appeler scroll-offset-top).

* {
  scroll-margin-top: 100px;
}

Docs - Fonctionne dans les navigateurs modernes - Démonstration du Codepen

links = [...document.getElementsByClassName("js-link")]
links.forEach(element => {
  element.addEventListener("click", e => {
    e.preventDefault()
    document.getElementById(e.target.dataset.target).scrollIntoView({
      behavior: "smooth",
      block: "start",
      inline: "nearest"
    })
  })
})

body {
  margin: 0;
}

header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  height: 100px;
  background: #eee;
  display: flex;
  align-items: center;
}

header a {
  padding: 0.5em;
}

h1 {
  padding: 0.7em;
}

* {
  scroll-margin-top: 100px;
}

p {
  padding: 1em;
}

<header>
  <h1>page title</h1>
  <nav>
    <a href="#p1" class="js-link" data-target="p1">1</a>
    <a href="#p2" class="js-link" data-target="p2">2</a>
    <a href="#p3" class="js-link" data-target="p3">3</a>
    <a href="#p4" class="js-link" data-target="p4">4</a>
    <a href="#p5" class="js-link" data-target="p5">5</a>
  </nav>
</header>

<main>
  <p id="p1">
    paragraph 1.
    <br> 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 Ipsu
  </p>
  <p id="p2">
    paragraph 2.
    <br> 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 Ipsu
  </p>
  <p id="p3">
    paragraph 3.
    <br> 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 Ipsu
  </p>
  <p id="p4">
    paragraph 4.
    <br> 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 Ipsu
  </p>
  <p id="p5">
    paragraph 5.
    <br> 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 Ipsu
  </p>
</main>

Answer 3

Le code suivant produit un défilement fluide vers le haut de l'élément avec un décalage pour l'en-tête fixe :

var topOfElement = document.querySelector('#targetElement').offsetTop - XX;
window.scroll({ top: topOfElement, behavior: "smooth" });

Où XX est la hauteur de votre en-tête fixe.

Answer 4

Edit : Bien que moins compatible (pas de compatibilité avec IE), scroll-margin-top résoudra également ce problème, comme mentionné dans La réponse de Arye Eidelman .

Vous pouvez résoudre ce problème avec CSS, en appliquant un padding-top et un négatif margin-top aux éléments que vous souhaitez faire défiler.

Démo

// For demo only, no JS needed for the solution
document.querySelector('.scroll-to-working-inline').addEventListener('click', function() {
  document.querySelector('.working-inline').scrollIntoView();
});

document.querySelector('.scroll-to-working-block').addEventListener('click', function() {
  document.querySelector('.working-block').scrollIntoView();
});

document.querySelector('.scroll-to-broken').addEventListener('click', function() {
  document.querySelector('.broken').scrollIntoView();
});

/* Relevant styles */
.working-inline {
  padding-top: 60px;
  margin-top: -60px;
}

.working-block {
  padding-top: 60px;
  margin-top: -60px;
}

/* Allow scrolling to the top */
body {
  padding-top: 60px;
}

/* Only for the demo */
body { margin: 0; }

header {
  position: fixed;
  top: 0;
  background-color: tomato;
  color: white;
  width: 100%;
  height: 60px;
  line-height: 60px;
  text-align: center;
}

[class^='working'],
[class^='broken'] {
  font-size: 3rem;
}

<header>
  scroll to...
  <button class="scroll-to-working-inline">working inline element</button>
  <button class="scroll-to-working-block">working block element</button>
  <button class="scroll-to-broken">broken element</button>
</header>

<main>
  <p>Sql daemon epoch all your base are belong to us packet system perl semaphore. Interpreter warez pragma kilo worm back door baz continue chown blob unix Dennis Ritchie stack mutex bar throw fopen man pages linux. Sql suitably small values bit infinite loop pwned rm -rf.</p>

  <a class="working-inline">Working inline</a>

  <p>Syn baz man pages unix vi crack leapfrog semaphore fail pwned afk null socket cd long leet emacs Donald Knuth bin grep todo pragma stdio.h January 1, 1970. Alloc gc system new finally sql stack trace syn mainframe cat machine code memory leak server salt flood tunnel in back door thread. Bytes fatal throw ctl-c Dennis Ritchie over clock eof tera perl regex.</p>

  <div class="working-block">Working block element</div>

  <p>Public injection class unix malloc error script kiddies packet less fail int I'm sorry Dave, I'm afraid I can't do that. Tarball memory leak double rsa pwned public all your base are belong to us. False bytes bang bar tarball semaphore warez cd port daemon exception mountain dew sql mainframe gcc ifdef chown private.</p>

  <div class="broken">Broken element</div>

  <p>Daemon bubble sort protected mutex overflow grep snarf crack warez I'm compiling bit if memory leak Starcraft nak script kiddies long it's a feature. Hello world public server James T. Kirk injection terminal wannabee race condition syn alloc. Gobble leapfrog finally bypass concurrently while irc gurfle do back door blob man pages sql over clock.</p>

  <p>Char hello world then man pages ascii long salt while char fatal do boolean tunnel in system else foo packet sniffer float terminal int default. Trojan horse ssh ifdef /dev/null chown cache error protocol afk todo rm -rf mainframe piggyback pwned regex xss warez Starcraft try catch stdio.h bubble sort. It's a feature I'm sorry Dave, I'm afraid I can't do that *.* port bypass ip.</p>

  <p>Stdio.h epoch mutex flood wannabee do race condition sql access exception. Bar pragma man pages dereference flush todo highjack while buffer bit nak big-endian syn xss salt for d00dz. Leslie Lamport linux server error hexadecimal snarf tunnel in rm -rf firewall then shell all your base are belong to us.</p>

  <p>Ascii gcc grep int flood kilo linux access mailbomb hash *.* fork semaphore frack else win bar ssh Leslie Lamport. Man pages strlen cache gnu segfault tarball race condition perl packet sniffer root cookie private chown d00dz January 1, 1970. Rsa public crack bit warez throw for void concurrently ip mutex.</p>

  <p>Char hello world then man pages ascii long salt while char fatal do boolean tunnel in system else foo packet sniffer float terminal int default. Trojan horse ssh ifdef /dev/null chown cache error protocol afk todo rm -rf mainframe piggyback pwned regex xss warez Starcraft try catch stdio.h bubble sort. It's a feature I'm sorry Dave, I'm afraid I can't do that *.* port bypass ip.</p>

  <p>Stdio.h epoch mutex flood wannabee do race condition sql access exception. Bar pragma man pages dereference flush todo highjack while buffer bit nak big-endian syn xss salt for d00dz. Leslie Lamport linux server error hexadecimal snarf tunnel in rm -rf firewall then shell all your base are belong to us.</p>

  <p>Ascii gcc grep int flood kilo linux access mailbomb hash *.* fork semaphore frack else win bar ssh Leslie Lamport. Man pages strlen cache gnu segfault tarball race condition perl packet sniffer root cookie private chown d00dz January 1, 1970. Rsa public crack bit warez throw for void concurrently ip mutex.</p>

  <p>Char hello world then man pages ascii long salt while char fatal do boolean tunnel in system else foo packet sniffer float terminal int default. Trojan horse ssh ifdef /dev/null chown cache error protocol afk todo rm -rf mainframe piggyback pwned regex xss warez Starcraft try catch stdio.h bubble sort. It's a feature I'm sorry Dave, I'm afraid I can't do that *.* port bypass ip.</p>

  <p>Stdio.h epoch mutex flood wannabee do race condition sql access exception. Bar pragma man pages dereference flush todo highjack while buffer bit nak big-endian syn xss salt for d00dz. Leslie Lamport linux server error hexadecimal snarf tunnel in rm -rf firewall then shell all your base are belong to us.</p>

  <p>Ascii gcc grep int flood kilo linux access mailbomb hash *.* fork semaphore frack else win bar ssh Leslie Lamport. Man pages strlen cache gnu segfault tarball race condition perl packet sniffer root cookie private chown d00dz January 1, 1970. Rsa public crack bit warez throw for void concurrently ip mutex.</p>
</main>

Answer 5

Une excellente solution simple (inspirée par le commentaire de Sanyam Jain) consiste à utiliser {block: 'center'} pour centrer verticalement la sélection comme ceci :

scrollIntoView({block: 'center'})

Modification - J'ai malheureusement trouvé sur la page MDN que cette fonctionnalité est "expérimentale - ne doit pas être utilisée en production". De plus, IE ne la supporte pas (si c'est un besoin).