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Bootstrap/js/tests/unit/scrollspy.spec.js

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import ScrollSpy from '../../src/scrollspy'
import Manipulator from '../../src/dom/manipulator'
import EventHandler from '../../src/dom/event-handler'
/** Test helpers */
import { getFixture, clearFixture, createEvent, jQueryMock } from '../helpers/fixture'
describe('ScrollSpy', () => {
let fixtureEl
const testElementIsActiveAfterScroll = ({ elementSelector, targetSelector, contentEl, scrollSpy, spy, cb }) => {
const element = fixtureEl.querySelector(elementSelector)
const target = fixtureEl.querySelector(targetSelector)
// add top padding to fix Chrome on Android failures
const paddingTop = 5
const scrollHeight = Math.ceil(contentEl.scrollTop + Manipulator.position(target).top) + paddingTop
function listener() {
expect(element.classList.contains('active')).toEqual(true)
contentEl.removeEventListener('scroll', listener)
expect(scrollSpy._process).toHaveBeenCalled()
spy.calls.reset()
cb()
}
contentEl.addEventListener('scroll', listener)
contentEl.scrollTop = scrollHeight
}
beforeAll(() => {
fixtureEl = getFixture()
})
afterEach(() => {
clearFixture()
})
describe('VERSION', () => {
it('should return plugin version', () => {
expect(ScrollSpy.VERSION).toEqual(jasmine.any(String))
})
})
describe('Default', () => {
it('should return plugin default config', () => {
expect(ScrollSpy.Default).toEqual(jasmine.any(Object))
})
})
describe('constructor', () => {
it('should generate an id when there is not one', () => {
fixtureEl.innerHTML = [
'<nav></nav>',
'<div class="content"></div>'
].join('')
const navEl = fixtureEl.querySelector('nav')
const scrollSpy = new ScrollSpy(fixtureEl.querySelector('.content'), {
target: navEl
})
expect(scrollSpy).toBeDefined()
expect(navEl.getAttribute('id')).not.toEqual(null)
})
it('should not process element without target', () => {
fixtureEl.innerHTML = [
'<nav id="navigation" class="navbar">',
' <ul class="navbar-nav">',
' <li class="nav-item active"><a class="nav-link" id="one-link" href="#">One</a></li>',
' <li class="nav-item"><a class="nav-link" id="two-link" href="#two">Two</a></li>',
' <li class="nav-item"><a class="nav-link" id="three-link" href="#three">Three</a></li>',
' </ul>',
'</nav>',
'<div id="content" style="height: 200px; overflow-y: auto;">',
' <div id="two" style="height: 300px;"></div>',
' <div id="three" style="height: 10px;"></div>',
'</div>'
].join('')
const scrollSpy = new ScrollSpy(fixtureEl.querySelector('#content'), {
target: '#navigation'
})
expect(scrollSpy._targets.length).toEqual(2)
})
it('should only switch "active" class on current target', done => {
fixtureEl.innerHTML = [
'<div id="root" class="active" style="display: block">',
' <div class="topbar">',
' <div class="topbar-inner">',
' <div class="container" id="ss-target">',
' <ul class="nav">',
' <li class="nav-item"><a href="#masthead">Overview</a></li>',
' <li class="nav-item"><a href="#detail">Detail</a></li>',
' </ul>',
' </div>',
' </div>',
' </div>',
' <div id="scrollspy-example" style="height: 100px; overflow: auto;">',
' <div style="height: 200px;">',
' <h4 id="masthead">Overview</h4>',
' <p style="height: 200px;"></p>',
' </div>',
' <div style="height: 200px;">',
' <h4 id="detail">Detail</h4>',
' <p style="height: 200px;"></p>',
' </div>',
' </div>',
'</div>'
].join('')
const scrollSpyEl = fixtureEl.querySelector('#scrollspy-example')
const rootEl = fixtureEl.querySelector('#root')
const scrollSpy = new ScrollSpy(scrollSpyEl, {
target: 'ss-target'
})
spyOn(scrollSpy, '_process').and.callThrough()
scrollSpyEl.addEventListener('scroll', () => {
expect(rootEl.classList.contains('active')).toEqual(true)
expect(scrollSpy._process).toHaveBeenCalled()
done()
})
scrollSpyEl.scrollTop = 350
})
it('should only switch "active" class on current target specified w element', done => {
fixtureEl.innerHTML = [
'<div id="root" class="active" style="display: block">',
' <div class="topbar">',
' <div class="topbar-inner">',
' <div class="container" id="ss-target">',
' <ul class="nav">',
' <li class="nav-item"><a href="#masthead">Overview</a></li>',
' <li class="nav-item"><a href="#detail">Detail</a></li>',
' </ul>',
' </div>',
' </div>',
' </div>',
' <div id="scrollspy-example" style="height: 100px; overflow: auto;">',
' <div style="height: 200px;">',
' <h4 id="masthead">Overview</h4>',
' <p style="height: 200px;"></p>',
' </div>',
' <div style="height: 200px;">',
' <h4 id="detail">Detail</h4>',
' <p style="height: 200px;"></p>',
' </div>',
' </div>',
'</div>'
].join('')
const scrollSpyEl = fixtureEl.querySelector('#scrollspy-example')
const rootEl = fixtureEl.querySelector('#root')
const scrollSpy = new ScrollSpy(scrollSpyEl, {
target: fixtureEl.querySelector('#ss-target')
})
spyOn(scrollSpy, '_process').and.callThrough()
scrollSpyEl.addEventListener('scroll', () => {
expect(rootEl.classList.contains('active')).toEqual(true)
expect(scrollSpy._process).toHaveBeenCalled()
done()
})
scrollSpyEl.scrollTop = 350
})
it('should correctly select middle navigation option when large offset is used', done => {
fixtureEl.innerHTML = [
'<div id="header" style="height: 500px;"></div>',
'<nav id="navigation" class="navbar">',
' <ul class="navbar-nav">',
' <li class="nav-item active"><a class="nav-link" id="one-link" href="#one">One</a></li>',
' <li class="nav-item"><a class="nav-link" id="two-link" href="#two">Two</a></li>',
' <li class="nav-item"><a class="nav-link" id="three-link" href="#three">Three</a></li>',
' </ul>',
'</nav>',
'<div id="content" style="height: 200px; overflow-y: auto;">',
' <div id="one" style="height: 500px;"></div>',
' <div id="two" style="height: 300px;"></div>',
' <div id="three" style="height: 10px;"></div>',
'</div>'
].join('')
const contentEl = fixtureEl.querySelector('#content')
const scrollSpy = new ScrollSpy(contentEl, {
target: '#navigation',
offset: Manipulator.position(contentEl).top
})
spyOn(scrollSpy, '_process').and.callThrough()
contentEl.addEventListener('scroll', () => {
expect(fixtureEl.querySelector('#one-link').classList.contains('active')).toEqual(false)
expect(fixtureEl.querySelector('#two-link').classList.contains('active')).toEqual(true)
expect(fixtureEl.querySelector('#three-link').classList.contains('active')).toEqual(false)
expect(scrollSpy._process).toHaveBeenCalled()
done()
})
contentEl.scrollTop = 550
})
it('should add the active class to the correct element', done => {
fixtureEl.innerHTML = [
'<nav class="navbar">',
' <ul class="nav">',
' <li class="nav-item"><a class="nav-link" id="a-1" href="#div-1">div 1</a></li>',
' <li class="nav-item"><a class="nav-link" id="a-2" href="#div-2">div 2</a></li>',
' </ul>',
'</nav>',
'<div class="content" style="overflow: auto; height: 50px">',
' <div id="div-1" style="height: 100px; padding: 0; margin: 0">div 1</div>',
' <div id="div-2" style="height: 200px; padding: 0; margin: 0">div 2</div>',
'</div>'
].join('')
const contentEl = fixtureEl.querySelector('.content')
const scrollSpy = new ScrollSpy(contentEl, {
offset: 0,
target: '.navbar'
})
const spy = spyOn(scrollSpy, '_process').and.callThrough()
testElementIsActiveAfterScroll({
elementSelector: '#a-1',
targetSelector: '#div-1',
contentEl,
scrollSpy,
spy,
cb: () => {
testElementIsActiveAfterScroll({
elementSelector: '#a-2',
targetSelector: '#div-2',
contentEl,
scrollSpy,
spy,
cb: () => done()
})
}
})
})
it('should add the active class to the correct element (nav markup)', done => {
fixtureEl.innerHTML = [
'<nav class="navbar">',
' <nav class="nav">',
' <a class="nav-link" id="a-1" href="#div-1">div 1</a>',
' <a class="nav-link" id="a-2" href="#div-2">div 2</a>',
' </nav>',
'</nav>',
'<div class="content" style="overflow: auto; height: 50px">',
' <div id="div-1" style="height: 100px; padding: 0; margin: 0">div 1</div>',
' <div id="div-2" style="height: 200px; padding: 0; margin: 0">div 2</div>',
'</div>'
].join('')
const contentEl = fixtureEl.querySelector('.content')
const scrollSpy = new ScrollSpy(contentEl, {
offset: 0,
target: '.navbar'
})
const spy = spyOn(scrollSpy, '_process').and.callThrough()
testElementIsActiveAfterScroll({
elementSelector: '#a-1',
targetSelector: '#div-1',
contentEl,
scrollSpy,
spy,
cb: () => {
testElementIsActiveAfterScroll({
elementSelector: '#a-2',
targetSelector: '#div-2',
contentEl,
scrollSpy,
spy,
cb: () => done()
})
}
})
})
it('should add the active class to the correct element (list-group markup)', done => {
fixtureEl.innerHTML = [
'<nav class="navbar">',
' <div class="list-group">',
' <a class="list-group-item" id="a-1" href="#div-1">div 1</a>',
' <a class="list-group-item" id="a-2" href="#div-2">div 2</a>',
' </div>',
'</nav>',
'<div class="content" style="overflow: auto; height: 50px">',
' <div id="div-1" style="height: 100px; padding: 0; margin: 0">div 1</div>',
' <div id="div-2" style="height: 200px; padding: 0; margin: 0">div 2</div>',
'</div>'
].join('')
const contentEl = fixtureEl.querySelector('.content')
const scrollSpy = new ScrollSpy(contentEl, {
offset: 0,
target: '.navbar'
})
const spy = spyOn(scrollSpy, '_process').and.callThrough()
testElementIsActiveAfterScroll({
elementSelector: '#a-1',
targetSelector: '#div-1',
contentEl,
scrollSpy,
spy,
cb: () => {
testElementIsActiveAfterScroll({
elementSelector: '#a-2',
targetSelector: '#div-2',
contentEl,
scrollSpy,
spy,
cb: () => done()
})
}
})
})
it('should clear selection if above the first section', done => {
fixtureEl.innerHTML = [
'<div id="header" style="height: 500px;"></div>',
'<nav id="navigation" class="navbar">',
' <ul class="navbar-nav">',
' <li class="nav-item"><a id="one-link" class="nav-link active" href="#one">One</a></li>',
' <li class="nav-item"><a id="two-link" class="nav-link" href="#two">Two</a></li>',
' <li class="nav-item"><a id="three-link" class="nav-link" href="#three">Three</a></li>',
' </ul>',
'</nav>',
'<div id="content" style="height: 200px; overflow-y: auto;">',
' <div id="spacer" style="height: 100px;"></div>',
' <div id="one" style="height: 100px;"></div>',
' <div id="two" style="height: 100px;"></div>',
' <div id="three" style="height: 100px;"></div>',
' <div id="spacer" style="height: 100px;"></div>',
'</div>'
].join('')
const contentEl = fixtureEl.querySelector('#content')
const scrollSpy = new ScrollSpy(contentEl, {
target: '#navigation',
offset: Manipulator.position(contentEl).top
})
const spy = spyOn(scrollSpy, '_process').and.callThrough()
let firstTime = true
contentEl.addEventListener('scroll', () => {
const active = fixtureEl.querySelector('.active')
expect(spy).toHaveBeenCalled()
spy.calls.reset()
if (firstTime) {
expect(fixtureEl.querySelectorAll('.active').length).toEqual(1)
expect(active.getAttribute('id')).toEqual('two-link')
firstTime = false
contentEl.scrollTop = 0
} else {
expect(active).toBeNull()
done()
}
})
contentEl.scrollTop = 201
})
it('should not clear selection if above the first section and first section is at the top', done => {
fixtureEl.innerHTML = [
'<div id="header" style="height: 500px;"></div>',
'<nav id="navigation" class="navbar">',
' <ul class="navbar-nav">',
' <li class="nav-item"><a id="one-link" class="nav-link active" href="#one">One</a></li>',
' <li class="nav-item"><a id="two-link" class="nav-link" href="#two">Two</a></li>',
' <li class="nav-item"><a id="three-link" class="nav-link" href="#three">Three</a></li>',
' </ul>',
'</nav>',
'<div id="content" style="height: 200px; overflow-y: auto;">',
' <div id="one" style="height: 100px;"></div>',
' <div id="two" style="height: 100px;"></div>',
' <div id="three" style="height: 100px;"></div>',
' <div id="spacer" style="height: 100px;"></div>',
'</div>'
].join('')
const negativeHeight = -10
const startOfSectionTwo = 101
const contentEl = fixtureEl.querySelector('#content')
const scrollSpy = new ScrollSpy(contentEl, {
target: '#navigation',
offset: contentEl.offsetTop
})
const spy = spyOn(scrollSpy, '_process').and.callThrough()
let firstTime = true
contentEl.addEventListener('scroll', () => {
const active = fixtureEl.querySelector('.active')
expect(spy).toHaveBeenCalled()
spy.calls.reset()
if (firstTime) {
expect(fixtureEl.querySelectorAll('.active').length).toEqual(1)
expect(active.getAttribute('id')).toEqual('two-link')
firstTime = false
contentEl.scrollTop = negativeHeight
} else {
expect(fixtureEl.querySelectorAll('.active').length).toEqual(1)
expect(active.getAttribute('id')).toEqual('one-link')
done()
}
})
contentEl.scrollTop = startOfSectionTwo
})
it('should correctly select navigation element on backward scrolling when each target section height is 100%', done => {
fixtureEl.innerHTML = [
'<nav class="navbar">',
' <ul class="nav">',
' <li class="nav-item"><a id="li-100-1" class="nav-link" href="#div-100-1">div 1</a></li>',
' <li class="nav-item"><a id="li-100-2" class="nav-link" href="#div-100-2">div 2</a></li>',
' <li class="nav-item"><a id="li-100-3" class="nav-link" href="#div-100-3">div 3</a></li>',
' <li class="nav-item"><a id="li-100-4" class="nav-link" href="#div-100-4">div 4</a></li>',
' <li class="nav-item"><a id="li-100-5" class="nav-link" href="#div-100-5">div 5</a></li>',
' </ul>',
'</nav>',
'<div class="content" style="position: relative; overflow: auto; height: 100px">',
' <div id="div-100-1" style="position: relative; height: 100%; padding: 0; margin: 0">div 1</div>',
' <div id="div-100-2" style="position: relative; height: 100%; padding: 0; margin: 0">div 2</div>',
' <div id="div-100-3" style="position: relative; height: 100%; padding: 0; margin: 0">div 3</div>',
' <div id="div-100-4" style="position: relative; height: 100%; padding: 0; margin: 0">div 4</div>',
' <div id="div-100-5" style="position: relative; height: 100%; padding: 0; margin: 0">div 5</div>',
'</div>'
].join('')
const contentEl = fixtureEl.querySelector('.content')
const scrollSpy = new ScrollSpy(contentEl, {
offset: 0,
target: '.navbar'
})
const spy = spyOn(scrollSpy, '_process').and.callThrough()
testElementIsActiveAfterScroll({
elementSelector: '#li-100-5',
targetSelector: '#div-100-5',
scrollSpy,
spy,
contentEl,
cb() {
contentEl.scrollTop = 0
testElementIsActiveAfterScroll({
elementSelector: '#li-100-4',
targetSelector: '#div-100-4',
scrollSpy,
spy,
contentEl,
cb() {
contentEl.scrollTop = 0
testElementIsActiveAfterScroll({
elementSelector: '#li-100-3',
targetSelector: '#div-100-3',
scrollSpy,
spy,
contentEl,
cb() {
contentEl.scrollTop = 0
testElementIsActiveAfterScroll({
elementSelector: '#li-100-2',
targetSelector: '#div-100-2',
scrollSpy,
spy,
contentEl,
cb() {
contentEl.scrollTop = 0
testElementIsActiveAfterScroll({
elementSelector: '#li-100-1',
targetSelector: '#div-100-1',
scrollSpy,
spy,
contentEl,
cb: done
})
}
})
}
})
}
})
}
})
})
it('should allow passed in option offset method: offset', () => {
fixtureEl.innerHTML = [
'<nav class="navbar">',
' <ul class="nav">',
' <li class="nav-item"><a id="li-jsm-1" class="nav-link" href="#div-jsm-1">div 1</a></li>',
' <li class="nav-item"><a id="li-jsm-2" class="nav-link" href="#div-jsm-2">div 2</a></li>',
' <li class="nav-item"><a id="li-jsm-3" class="nav-link" href="#div-jsm-3">div 3</a></li>',
' </ul>',
'</nav>',
'<div class="content" style="position: relative; overflow: auto; height: 100px">',
' <div id="div-jsm-1" style="position: relative; height: 200px; padding: 0; margin: 0">div 1</div>',
' <div id="div-jsm-2" style="position: relative; height: 150px; padding: 0; margin: 0">div 2</div>',
' <div id="div-jsm-3" style="position: relative; height: 250px; padding: 0; margin: 0">div 3</div>',
'</div>'
].join('')
const contentEl = fixtureEl.querySelector('.content')
const targetEl = fixtureEl.querySelector('#div-jsm-2')
const scrollSpy = new ScrollSpy(contentEl, {
target: '.navbar',
offset: 0,
method: 'offset'
})
expect(scrollSpy._offsets[1]).toEqual(Manipulator.offset(targetEl).top)
expect(scrollSpy._offsets[1]).not.toEqual(Manipulator.position(targetEl).top)
})
it('should allow passed in option offset method: position', () => {
fixtureEl.innerHTML = [
'<nav class="navbar">',
' <ul class="nav">',
' <li class="nav-item"><a id="li-jsm-1" class="nav-link" href="#div-jsm-1">div 1</a></li>',
' <li class="nav-item"><a id="li-jsm-2" class="nav-link" href="#div-jsm-2">div 2</a></li>',
' <li class="nav-item"><a id="li-jsm-3" class="nav-link" href="#div-jsm-3">div 3</a></li>',
' </ul>',
'</nav>',
'<div class="content" style="position: relative; overflow: auto; height: 100px">',
' <div id="div-jsm-1" style="position: relative; height: 200px; padding: 0; margin: 0">div 1</div>',
' <div id="div-jsm-2" style="position: relative; height: 150px; padding: 0; margin: 0">div 2</div>',
' <div id="div-jsm-3" style="position: relative; height: 250px; padding: 0; margin: 0">div 3</div>',
'</div>'
].join('')
const contentEl = fixtureEl.querySelector('.content')
const targetEl = fixtureEl.querySelector('#div-jsm-2')
const scrollSpy = new ScrollSpy(contentEl, {
target: '.navbar',
offset: 0,
method: 'position'
})
expect(scrollSpy._offsets[1]).not.toEqual(Manipulator.offset(targetEl).top)
expect(scrollSpy._offsets[1]).toEqual(Manipulator.position(targetEl).top)
})
})
describe('dispose', () => {
it('should dispose a scrollspy', () => {
spyOn(EventHandler, 'off')
fixtureEl.innerHTML = '<div style="display: none;"></div>'
const divEl = fixtureEl.querySelector('div')
const scrollSpy = new ScrollSpy(divEl)
scrollSpy.dispose()
expect(EventHandler.off).toHaveBeenCalledWith(divEl, '.bs.scrollspy')
})
})
describe('jQueryInterface', () => {
it('should create a scrollspy', () => {
fixtureEl.innerHTML = '<div></div>'
const div = fixtureEl.querySelector('div')
jQueryMock.fn.scrollspy = ScrollSpy.jQueryInterface
jQueryMock.elements = [div]
jQueryMock.fn.scrollspy.call(jQueryMock)
expect(ScrollSpy.getInstance(div)).toBeDefined()
})
it('should not re create a scrollspy', () => {
fixtureEl.innerHTML = '<div></div>'
const div = fixtureEl.querySelector('div')
const scrollSpy = new ScrollSpy(div)
jQueryMock.fn.scrollspy = ScrollSpy.jQueryInterface
jQueryMock.elements = [div]
jQueryMock.fn.scrollspy.call(jQueryMock)
expect(ScrollSpy.getInstance(div)).toEqual(scrollSpy)
})
it('should call a scrollspy method', () => {
fixtureEl.innerHTML = '<div></div>'
const div = fixtureEl.querySelector('div')
const scrollSpy = new ScrollSpy(div)
spyOn(scrollSpy, 'refresh')
jQueryMock.fn.scrollspy = ScrollSpy.jQueryInterface
jQueryMock.elements = [div]
jQueryMock.fn.scrollspy.call(jQueryMock, 'refresh')
expect(ScrollSpy.getInstance(div)).toEqual(scrollSpy)
expect(scrollSpy.refresh).toHaveBeenCalled()
})
it('should throw error on undefined method', () => {
fixtureEl.innerHTML = '<div></div>'
const div = fixtureEl.querySelector('div')
const action = 'undefinedMethod'
jQueryMock.fn.scrollspy = ScrollSpy.jQueryInterface
jQueryMock.elements = [div]
try {
jQueryMock.fn.scrollspy.call(jQueryMock, action)
} catch (error) {
expect(error.message).toEqual(`No method named "${action}"`)
}
})
})
describe('getInstance', () => {
it('should return null if there is no instance', () => {
expect(ScrollSpy.getInstance(fixtureEl)).toEqual(null)
})
})
describe('event handler', () => {
it('should create scrollspy on window load event', () => {
fixtureEl.innerHTML = '<div data-spy="scroll"></div>'
const scrollSpyEl = fixtureEl.querySelector('div')
window.dispatchEvent(createEvent('load'))
expect(ScrollSpy.getInstance(scrollSpyEl)).not.toBeNull()
})
})
})
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