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Add stop-at-bottom functionality

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Detach all methods from sticky reference so they
can be attached to different objects.

Split sticky into stickAtTop and stickAtBottom and
make new versions of all methods and properties
specific to stickAtBottom.

Add CSS for stickAtBottom and call on load
This commit is contained in:
Tom Byers
2018-11-05 17:47:25 +00:00
parent ef76d4eeb3
commit deaa253e65
3 changed files with 263 additions and 134 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
app/assets/javascripts/main.js
View File

@@ -1,6 +1,7 @@
$(() => $("time.timeago").timeago());
$(() => GOVUK.stickAtTopWhenScrolling.init());
$(() => GOVUK.stickAtBottomWhenScrolling.init());
var showHideContent = new GOVUK.ShowHideContent();
showHideContent.init();

349
app/assets/javascripts/stick-at-top-when-scrolling.js
View File

@@ -5,142 +5,243 @@
var GOVUK = global.GOVUK || {}
// Stick elements to top of screen when you scroll past, documentation is in the README.md
var sticky = {
_hasScrolled: false,
_scrollTimeout: false,
_hasResized: false,
_resizeTimeout: false,
_els: [],
var Sticky = function (selector) {
this._hasScrolled: false
this._scrollTimeout: false
this._hasResized: false
this._resizeTimeout: false
this._els: []
getWindowDimensions: function () {
return {
height: $(global).height(),
width: $(global).width()
}
},
getWindowPositions: function () {
return {
scrollTop: $(global).scrollTop()
}
},
getElementOffset: function ($el) {
return $el.offset()
},
setElHeight: function (el) {
var fixedOffset = parseInt(el.$fixedEl.css('top'), 10)
var $el = el.$fixedEl
var $img = $el.find('img')
this.CSS_SELECTOR: selector
}
Sticky.prototype.getWindowDimensions = function () {
return {
height: $(global).height(),
width: $(global).width()
}
}
Sticky.prototype.getWindowPositions = function () {
return {
scrollTop: $(global).scrollTop()
}
}
Sticky.prototype.setFixedTop = function (el) {
var $siblingEl = $('<div></div>')
$siblingEl.insertBefore(el.$fixedEl)
var fixedTop = $siblingEl.offset().top - $siblingEl.position().top
$siblingEl.remove()
fixedOffset = isNaN(fixedOffset) ? 0 : fixedOffset
el.fixedTop = fixedTop
}
Sticky.prototype.setElHeight = function (el) {
var self = this
var fixedOffset = parseInt(el.$fixedEl.css('top'), 10)
var $el = el.$fixedEl
var $img = $el.find('img')
if ($img.length > 0) {
var image = new global.Image()
image.onload = function () {
el.height = $el.outerHeight() + fixedOffset
}
image.src = $img.attr('src')
} else {
fixedOffset = isNaN(fixedOffset) ? 0 : fixedOffset
if ($img.length > 0) {
var image = new global.Image()
image.onload = function () {
el.height = $el.outerHeight() + fixedOffset
el.scrolledTo = self.getScrollingTo(el)
}
},
init: function () {
var $els = $('.js-stick-at-top-when-scrolling')
image.src = $img.attr('src')
} else {
el.height = $el.outerHeight() + fixedOffset
el.scrolledTo = self.getScrollingTo(el)
}
}
Sticky.prototype.init = function () {
var self = this
var $els = $(self.CSS_SELECTOR)
if ($els.length > 0) {
$els.each(function (i, el) {
var $el = $(el)
var el = {
$fixedEl: $el
}
sticky.setElHeight(el)
sticky._els.push(el)
$el.data('scrolled-from', sticky.getElementOffset($el).top)
})
if (sticky._scrollTimeout === false) {
$(global).scroll(sticky.onScroll)
sticky._scrollTimeout = global.setInterval(sticky.checkScroll, 50)
if ($els.length > 0) {
$els.each(function (i, el) {
var $el = $(el)
var el = {
$fixedEl: $el,
scrolledFrom: self.getScrolledFrom($el),
stopped: false
}
if (sticky._resizeTimeout === false) {
$(global).resize(sticky.onResize)
sticky._resizeTimeout = global.setInterval(sticky.checkResize, 50)
}
self.setFixedTop(el)
self.setElHeight(el)
self._els.push(el)
})
if (self._scrollTimeout === false) {
$(global).scroll(function (e) { self.onScroll() })
self._scrollTimeout = global.setInterval(function (e) { self.checkScroll() }, 50)
}
},
onScroll: function () {
sticky._hasScrolled = true
},
onResize: function () {
sticky._hasResized = true
},
scrolledFromInsideWindow: function (scrolledFrom) {
var windowVerticalPosition = sticky.getWindowPositions().scrollTop
return windowVerticalPosition < scrolledFrom
},
checkScroll: function () {
if (sticky._hasScrolled === true) {
sticky._hasScrolled = false
var windowDimensions = sticky.getWindowDimensions()
$.each(sticky._els, function (i, el) {
var $el = el.$fixedEl
var scrolledFrom = $el.data('scrolled-from')
if (scrolledFrom && sticky.scrolledFromInsideWindow(scrolledFrom)) {
sticky.release($el)
} else if (windowDimensions.width > 768 && !sticky.scrolledFromInsideWindow(scrolledFrom)) {
sticky.stick($el)
}
})
}
},
checkResize: function () {
if (sticky._hasResized === true) {
sticky._hasResized = false
var windowDimensions = sticky.getWindowDimensions()
$.each(sticky._els, function (i, el) {
var $el = el.$fixedEl
var elResize = $el.hasClass('js-sticky-resize')
if (elResize) {
var $shim = $('.shim')
var $elParent = $el.parent('div')
var elParentWidth = $elParent.width()
$shim.css('width', elParentWidth)
$el.css('width', elParentWidth)
}
if (windowDimensions.width <= 768) {
sticky.release($el)
}
})
}
},
addShimForEl: function ($el, width, height) {
$el.before('<div class="shim" style="width: ' + width + 'px; height: ' + height + 'px">&nbsp;</div>')
},
stick: function ($el) {
if (!$el.hasClass('content-fixed')) {
var height = Math.max($el.height(), 1)
var width = $el.width()
sticky.addShimForEl($el, width, height)
$el.css('width', width + 'px').addClass('content-fixed')
}
},
release: function ($el) {
if ($el.hasClass('content-fixed')) {
$el.removeClass('content-fixed').css('width', '')
$el.siblings('.shim').remove()
if (self._resizeTimeout === false) {
$(global).resize(function (e) { self.onResize() })
self._resizeTimeout = global.setInterval(function (e) { self.checkResize() }, 50)
}
}
}
GOVUK.stickAtTopWhenScrolling = sticky
Sticky.prototype.onScroll = function () {
this._hasScrolled = true
}
Sticky.prototype.onResize = function () {
this._hasResized = true
}
Sticky.prototype.viewportIsWideEnough = function (windowWidth) {
return windowWidth > 768
}
Sticky.prototype.checkScroll = function () {
var self = this
if (self._hasScrolled === true) {
self._hasScrolled = false
$.each(self._els, function (i, el) {
var $el = el.$fixedEl
var windowDimensions = self.getWindowDimensions()
if (self.scrolledFromInsideWindow(el.scrolledFrom)) {
self.release($el)
} else {
if (self.scrolledToOutsideWindow(el, windowDimensions.height)) {
self.stop(el)
} else if (self.viewportIsWideEnough(windowDimensions.width)) {
if (el.stopped) {
self.unstop(el)
}
self.stick($el)
}
}
})
}
}
Sticky.prototype.checkResize = function () {
var self = this
if (self._hasResized === true) {
self._hasResized = false
var windowDimensions = self.getWindowDimensions()
$.each(self._els, function (i, el) {
var $el = el.$fixedEl
var elResize = $el.hasClass('js-self-resize')
if (elResize) {
var $shim = $('.shim')
var $elParent = $el.parent('div')
var elParentWidth = $elParent.width()
$shim.css('width', elParentWidth)
$el.css('width', elParentWidth)
}
if (windowDimensions.width <= 768) {
self.release($el)
}
})
}
}
Sticky.prototype.stick = function ($el) {
if (!$el.hasClass('content-fixed')) {
var height = Math.max($el.height(), 1)
var width = $el.width()
this.addShimForEl($el, width, height)
$el.css('width', width + 'px').addClass('content-fixed')
}
}
Sticky.prototype.release = function ($el) {
if ($el.hasClass('content-fixed')) {
$el.removeClass('content-fixed').css('width', '')
$el.siblings('.shim').remove()
}
}
var stickAtTop = new Sticky('.js-stick-at-top-when-scrolling')
stickAtTop.getScrolledFrom = function ($el) {
return $el.offset().top
}
stickAtTop.getScrollingTo = function (el) {
var footer = $('.js-footer:eq(0)')
if (footer.length === 0) {
return 0
}
return (footer.offset().top - 10) - el.height
}
stickAtTop.scrolledFromInsideWindow = function (scrolledFrom) {
var windowTop = this.getWindowPositions().scrollTop
return scrolledFrom > windowTop
}
stickAtTop.scrolledToOutsideWindow = function (el, windowHeight) {
var windowTop = this.getWindowPositions().scrollTop
return windowTop > el.scrolledTo
}
stickAtTop.addShimForEl = function ($el, width, height) {
$el.before('<div class="shim" style="width: ' + width + 'px height: ' + height + 'px">&nbsp</div>')
}
stickAtTop.stop = function (el) {
if (!el.stopped) {
el.$fixedEl.css({ 'position': 'absolute', 'top': el.scrolledTo })
el.stopped = true
}
}
stickAtTop.unstop = function (el) {
if (el.stopped) {
el.$fixedEl.css({ 'position': '', 'top': '' })
el.stopped = false
}
}
var stickAtBottom = new Sticky('.js-stick-at-bottom-when-scrolling')
stickAtBottom.getScrolledFrom = function ($el) {
return $el.offset().top + $el.outerHeight()
}
stickAtBottom.getScrollingTo = function (el) {
var header = $('.js-header:eq(0)')
if (header.length === 0) {
return 0
}
return (header.offset().top + header.outerHeight() + 10) + el.height
}
stickAtBottom.scrolledFromInsideWindow = function (scrolledFrom) {
var windowBottom = this.getWindowPositions().scrollTop + this.getWindowDimensions().height
return scrolledFrom < windowBottom
}
stickAtBottom.scrolledToOutsideWindow = function (el, windowHeight) {
var windowBottom = this.getWindowPositions().scrollTop + this.getWindowDimensions().height
return windowBottom < el.scrolledTo
}
stickAtBottom.addShimForEl = function ($el, width, height) {
$el.after('<div class="shim" style="width: ' + width + 'px height: ' + height + 'px">&nbsp</div>')
}
stickAtBottom.stop = function (el) {
if (!el.stopped) {
el.$fixedEl.css({
'position': 'absolute',
'top': (el.scrolledTo - el.height),
'bottom': 'auto'
})
el.stopped = true
}
}
stickAtBottom.unstop = function (el) {
if (el.stopped) {
el.$fixedEl.css({
'position': '',
'top': '',
'bottom': ''
})
el.stopped = false
}
}
GOVUK.stickAtTopWhenScrolling = stickAtTop
GOVUK.stickAtBottomWhenScrolling = stickAtBottom
global.GOVUK = GOVUK
})(window)