Source

Scrollspy

Automātiski atjauniniet Bootstrap navigācijas vai saraksta grupas komponentus, pamatojoties uz ritināšanas pozīciju, lai norādītu, kura saite pašlaik ir aktīva skatvietā.

Kā tas strādā

Lai Scrollspy pareizi darbotos, ir jāievēro dažas prasības:

  • Ja veidojat mūsu JavaScript no avota, tam ir nepieciešamsutil.js .
  • Tas ir jāizmanto Bootstrap navigācijas komponentā vai sarakstu grupā .
  • Scrollspy pieprasa position: relative;elementu, kuru izspiegojat, parasti <body>.
  • Izspiegojot citus elementus, nevis <body>, noteikti ir jābūt heightiestatītam un overflow-y: scroll;lietotam.
  • Enkuri ( <a>) ir nepieciešami, un tiem jānorāda uz elementu ar to id.

Kad tas būs veiksmīgi ieviests, jūsu navigācijas vai sarakstu grupa tiks attiecīgi atjaunināta, pārvietojot .activeklasi no viena vienuma uz nākamo, pamatojoties uz saistītajiem mērķiem.

Piemērs navigācijas joslā

Ritiniet apgabalu zem navigācijas joslas un skatieties, kā mainās aktīvā klase. Tiks izcelti arī nolaižamās izvēlnes vienumi.

@resns

Reklāmas legingi keytar, branch id art party dolor labore. Pitchfork yr enim lo-fi, pirms tie tika izpārdoti. Tumblr velosipēdu tiesības no saimniecības līdz galdam neatkarīgi no tā. Anim keffiyeh carles jaka. Velit seitan mcsweeney's foto booth 3 wolf moon irure. Cosby džemperis lomo jean šorti, williamsburg hoodie minim qui jūs droši vien neesat dzirdējuši par tiem un jakas trasta fonds culpa biodiesel wes anderson estētiskā. Nihil tetovēts accusamus, cred ironija biodīzelis keffiyeh artisan ullamco consequat.

@mdo

Veniam marfa mustache skateboard, adipisicing fugiat velit pitchfork beard. Freegan beard aliqua cupidatat mcsweeney's vero. Cupidatat four loko nisi, ea helvetica nulla carles. Tattooed cosby sweater food truck, mcsweeney's quis non freegan vinyl. Lo-fi wes anderson +1 sartorial. Carles non aesthetic exercitation quis gentrify. Brooklyn adipisicing craft beer vice keytar deserunt.

one

Occaecat commodo aliqua delectus. Fap craft beer deserunt skateboard ea. Lomo bicycle rights adipisicing banh mi, velit ea sunt next level locavore single-origin coffee in magna veniam. High life id vinyl, echo park consequat quis aliquip banh mi pitchfork. Vero VHS est adipisicing. Consectetur nisi DIY minim messenger bag. Cred ex in, sustainable delectus consectetur fanny pack iphone.

two

In incididunt echo park, officia deserunt mcsweeney's proident master cleanse thundercats sapiente veniam. Excepteur VHS elit, proident shoreditch +1 biodiesel laborum craft beer. Single-origin coffee wayfarers irure four loko, cupidatat terry richardson master cleanse. Assumenda you probably haven't heard of them art party fanny pack, tattooed nulla cardigan tempor ad. Proident wolf nesciunt sartorial keffiyeh eu banh mi sustainable. Elit wolf voluptate, lo-fi ea portland before they sold out four loko. Locavore enim nostrud mlkshk brooklyn nesciunt.

three

Ad leggings keytar, brunch id art party dolor labore. Pitchfork yr enim lo-fi before they sold out qui. Tumblr farm-to-table bicycle rights whatever. Anim keffiyeh carles cardigan. Velit seitan mcsweeney's photo booth 3 wolf moon irure. Cosby sweater lomo jean shorts, williamsburg hoodie minim qui you probably haven't heard of them et cardigan trust fund culpa biodiesel wes anderson aesthetic. Nihil tattooed accusamus, cred irony biodiesel keffiyeh artisan ullamco consequat.

Keytar twee blog, culpa kurjersoma marfa whatever delectus food truck. Sapiente synth id uzņemties. Locavore sed helvetica klišeja ironija, pērkona kaķi, par kuriem jūs, iespējams, neesat dzirdējuši, consequat hoodie bez lipekļa lo-fi fap aliquip. Labore elit placeat, pirms tās izpārdotas, frotē Ričardsona proidents vēlās brokastis nesciunt quis cosby džemperis pariatur keffiyeh ut helvetica artisan. Cardigan craft alus seitan readymade velit. VHS chambray laboris tempor veniam. Anim mollit minim commodo ullamco thundercats.

<nav id="navbar-example2" class="navbar navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <ul class="nav nav-pills">
    <li class="nav-item">
      <a class="nav-link" href="#fat">@fat</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#mdo">@mdo</a>
    </li>
    <li class="nav-item dropdown">
      <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">Dropdown</a>
      <div class="dropdown-menu">
        <a class="dropdown-item" href="#one">one</a>
        <a class="dropdown-item" href="#two">two</a>
        <div role="separator" class="dropdown-divider"></div>
        <a class="dropdown-item" href="#three">three</a>
      </div>
    </li>
  </ul>
</nav>
<div data-spy="scroll" data-target="#navbar-example2" data-offset="0">
  <h4 id="fat">@fat</h4>
  <p>...</p>
  <h4 id="mdo">@mdo</h4>
  <p>...</p>
  <h4 id="one">one</h4>
  <p>...</p>
  <h4 id="two">two</h4>
  <p>...</p>
  <h4 id="three">three</h4>
  <p>...</p>
</div>

Piemērs ar ligzdotu navigāciju

Scrollspy darbojas arī ar ligzdotiem .navs. Ja ligzdots .navir .active, tā vecāki arī būs .active. Ritiniet apgabalu blakus navigācijas joslai un skatieties, kā mainās aktīvā klase.

1. punkts

Ex consequat commodo adipisicing exercitation aute kivételeur occaecat ullamco duis aliqua id magna ullamco eu. Do aute ipsum ipsum ullamco cillum consectetur ut et aute consectetur labore. Fugiat laborum incididunt tempor eu consequat enim dolore proident. Qui laborum do non izņemoteur nulla magna eiusmod consectetur in. Aliqua et aliqua officia quis et incididunt voluptate non anim reprehenderit adipisicing dolore ut consequat deserunt mollit dolore. Aliquip nulla enim veniam non fugiat id cupidatat nulla elit cupidatat commodo velit ut eiusmod cupidatat elit dolore.

1-1

Amet tempor mollit aliquip pariatur izņemot commodo do ea cillum commodo Lorem et occaecat elit qui et. Aliquip labore ex ex esse voluptate occaecat Lorem ullamco deserunt. Aliqua cillum izņemoteur irure consequat id quis ea. Sit proident ullamco aute magna pariatur nostrud labore. Reprehenderit aliqua commodo eiusmod aliquip est do duis amet proident magna consectetur consequat eu commodo fugiat non quis. Enim aliquip exercitation ullamco adipisicing voluptate izņemoteur minim exercitation minim minim commodo adipisicing exercitation officia nisi adipisicing. Anim id duis qui consequat labore adipisicing sint dolor elit cillum anim et fugiat.

2-2. punkts

Cillum nisi deserunt magna eiusmod qui eiusmod velit voluptate pariatur laborum sunt enim. Irure laboris mollit consequat incididunt sint et culpa culpa incididunt adipisicing magna magna occaecat. Nulla ipsum cillum eiusmod sint elit excepteur ea labore enim consectetur in labore anim. Proident ullamco ipsum esse elit ut Lorem eiusmod dolor et eiusmod. Anim occaecat nulla in non consequat eiusmod velit incididunt.

Item 2

Quis magna Lorem anim amet ipsum do mollit sit cillum voluptate ex nulla tempor. Laborum consequat non elit enim exercitation cillum aliqua consequat id aliqua. Esse ex consectetur mollit voluptate est in duis laboris ad sit ipsum anim Lorem. Incididunt veniam velit elit elit veniam Lorem aliqua quis ullamco deserunt sit enim elit aliqua esse irure. Laborum nisi sit est tempor laborum mollit labore officia laborum excepteur commodo non commodo dolor excepteur commodo. Ipsum fugiat ex est consectetur ipsum commodo tempor sunt in proident.

Item 3

Quis anim sit do amet fugiat dolor velit sit ea ea do reprehenderit culpa duis. Nostrud aliqua ipsum fugiat minim proident occaecat excepteur aliquip culpa aute tempor reprehenderit. Deserunt tempor mollit elit ex pariatur dolore velit fugiat mollit culpa irure ullamco est ex ullamco excepteur.

Item 3-1

Deserunt quis elit Lorem eiusmod amet enim enim amet minim Lorem proident nostrud. Ea id dolore anim exercitation aute fugiat labore voluptate cillum do laboris labore. Ex velit exercitation nisi enim labore reprehenderit labore nostrud ut ut. Esse officia sunt duis aliquip ullamco tempor eiusmod deserunt irure nostrud irure. Ullamco proident veniam laboris ea consectetur magna sunt ex exercitation aliquip minim enim culpa occaecat exercitation. Est tempor excepteur aliquip laborum consequat do deserunt laborum esse eiusmod irure proident ipsum esse qui.

Item 3-2

Labore sit culpa commodo elit adipisicing sit aliquip elit proident voluptate minim mollit nostrud aute reprehenderit darīt. Mollit izņemoteur eu Lorem ipsum anim commodo sint labore Lorem in exercitation velit incididunt. Occaecat consectetur nisi in occaecat proident minim enim sunt reprehenderit exercitation cupidatat et do officia. Aliquip consequat ad labore labore mollit ut amet. Sit pariatur tempor proident in veniam culpa aliqua izņemoteur elit magna fugiat eiusmod amet officia.

<nav id="navbar-example3" class="navbar navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <nav class="nav nav-pills flex-column">
    <a class="nav-link" href="#item-1">Item 1</a>
    <nav class="nav nav-pills flex-column">
      <a class="nav-link ml-3 my-1" href="#item-1-1">Item 1-1</a>
      <a class="nav-link ml-3 my-1" href="#item-1-2">Item 1-2</a>
    </nav>
    <a class="nav-link" href="#item-2">Item2</a>
    <a class="nav-link" href="#item-3">Item3</a>
    <nav class="nav nav-pills flex-column">
      <a class="nav-link ml-3 my-1" href="#item-3-1">Item 3-1</a>
      <a class="nav-link ml-3 my-1" href="#item-3-2">Item 3-2</a>
    </nav>
  </nav>
</nav>

<div data-spy="scroll" data-target="#navbar-example3" data-offset="0">
  <h4 id="item-1">Item 1</h4>
  <p>...</p>
  <h5 id="item-1-1">Item 1-1</h5>
  <p>...</p>
  <h5 id="item-1-2">Item 2-2</h5>
  <p>...</p>
  <h4 id="item-2">Item 2</h4>
  <p>...</p>
  <h4 id="item-3">Item 3</h4>
  <p>...</p>
  <h5 id="item-3-1">Item 3-1</h5>
  <p>...</p>
  <h5 id="item-3-2">Item 3-2</h5>
  <p>...</p>
</div>

Piemērs ar sarakstu grupu

Scrollspy darbojas arī ar .list-groups. Ritiniet apgabalu blakus saraksta grupai un skatieties aktīvās klases izmaiņas.

1. punkts

Ex consequat commodo adipisicing exercitation aute kivételeur occaecat ullamco duis aliqua id magna ullamco eu. Do aute ipsum ipsum ullamco cillum consectetur ut et aute consectetur labore. Fugiat laborum incididunt tempor eu consequat enim dolore proident. Qui laborum do non izņemoteur nulla magna eiusmod consectetur in. Aliqua et aliqua officia quis et incididunt voluptate non anim reprehenderit adipisicing dolore ut consequat deserunt mollit dolore. Aliquip nulla enim veniam non fugiat id cupidatat nulla elit cupidatat commodo velit ut eiusmod cupidatat elit dolore.

2. punkts

Quis magna Lorem anim amet ipsum do mollit sit cillum voluptate ex nulla tempor. Laborum consequat non elit enim exercitation cillum aliqua consequat id aliqua. Esse ex consectetur mollit voluptate est in duis laboris ad sit ipsum anim Lorem. Incididunt veniam velit elit elit veniam Lorem aliqua quis ullamco deserunt sit enim elit aliqua esse irure. Laborum nisi sit est tempor laborum mollit labore officia laborum izņemot commodo non commodo dolor izņemot commodo. Ipsum fugiat ex est consectetur ipsum commodo tempor sunt in proident.

3. punkts

Quis anim sit do amet fugiat dolor velit sit ea ea do reprehenderit culpa duis. Nostrud aliqua ipsum fugiat minim proident occaecat izņemoteur aliquip culpa aute tempor reprehenderit. Deserunt tempor mollit elit ex pariatur dolore velit fugiat mollit culpa irure ullamco est ex ullamco izņemoteur.

4. punkts

Quis anim sit do amet fugiat dolor velit sit ea ea do reprehenderit culpa duis. Nostrud aliqua ipsum fugiat minim proident occaecat izņemoteur aliquip culpa aute tempor reprehenderit. Deserunt tempor mollit elit ex pariatur dolore velit fugiat mollit culpa irure ullamco est ex ullamco izņemoteur.

<div id="list-example" class="list-group">
  <a class="list-group-item list-group-item-action" href="#list-item-1">Item 1</a>
  <a class="list-group-item list-group-item-action" href="#list-item-2">Item2</a>
  <a class="list-group-item list-group-item-action" href="#list-item-3">Item 3</a>
  <a class="list-group-item list-group-item-action" href="#list-item-4">Item 4</a>
</div>
<div data-spy="scroll" data-target="#list-example" data-offset="0" class="scrollspy-example">
  <h4 id="list-item-1">Item 1</h4>
  <p>...</p>
  <h4 id="list-item-2">Item 2</h4>
  <p>...</p>
  <h4 id="list-item-3">Item 3</h4>
  <p>...</p>
  <h4 id="list-item-4">Item 4</h4>
  <p>...</p>
</div>

Lietošana

Izmantojot datu atribūtus

Lai augšējās joslas navigācijai viegli pievienotu scrollspy darbību, pievienojiet data-spy="scroll"elementu, kuru vēlaties izspiegot (parasti tas ir <body>). Pēc tam pievienojiet atribūtu ar jebkura Bootstrap komponenta data-targetvecākelementa ID vai klasi ..nav

body {
  position: relative;
}
<body data-spy="scroll" data-target="#navbar-example">
  ...
  <div id="navbar-example">
    <ul class="nav nav-tabs" role="tablist">
      ...
    </ul>
  </div>
  ...
</body>

Izmantojot JavaScript

Pēc position: relative;CSS pievienošanas izsauciet scrollspy, izmantojot JavaScript:

$('body').scrollspy({ target: '#navbar-example' })

Nepieciešami atrisināmi ID mērķi

Navigācijas joslas saitēm ir jābūt atrisināmiem ID mērķiem. Piemēram, <a href="#home">home</a>ir jāatbilst kaut kam DOM, piemēram, <div id="home"></div>.

Elementi :visible, kas nav mērķa elementi, ir ignorēti

Mērķa elementi, kas neatbilst :visiblejQuery , tiks ignorēti, un tiem atbilstošie navigācijas vienumi nekad netiks izcelti.

Metodes

.scrollspy('refresh')

Izmantojot scrollspy kopā ar elementu pievienošanu vai noņemšanu no DOM, jums būs jāizsauc atsvaidzināšanas metode, piemēram:

$('[data-spy="scroll"]').each(function () {
  var $spy = $(this).scrollspy('refresh')
})

.scrollspy('dispose')

Iznīcina elementa scrollspy.

Iespējas

Opcijas var nodot, izmantojot datu atribūtus vai JavaScript. Datu atribūtiem pievienojiet opcijas nosaukumu data-, tāpat kā data-offset="".

Vārds Tips Noklusējums Apraksts
kompensēt numuru 10 Pikseļi, kas jānobīda no augšas, aprēķinot ritināšanas pozīciju.

Pasākumi

Pasākuma veids Apraksts
activate.bs.scrollspy Šis notikums tiek aktivizēts ritināšanas elementā ikreiz, kad scrollspy aktivizē jaunu vienumu.
$('[data-spy="scroll"]').on('activate.bs.scrollspy', function () {
  // do something…
})