Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Changed logic to trigger event per item which is in viewport #82

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Changed logic to trigger event per item which is in viewport #82

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
243 changes: 123 additions & 120 deletions jquery.inview.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -4,139 +4,142 @@
* - forked from http://github.com/zuk/jquery.inview/
*/
(function (factory) {
if (typeof define == 'function' && define.amd) {
// AMD
define(['jquery'], factory);
} else if (typeof exports === 'object') {
// Node, CommonJS
module.exports = factory(require('jquery'));
} else {
// Browser globals
factory(jQuery);
}
if (typeof define == 'function' && define.amd) {
// AMD
define(['jquery'], factory);
} else if (typeof exports === 'object') {
// Node, CommonJS
module.exports = factory(require('jquery'));
} else {
// Browser globals
factory(jQuery);
}
}(function ($) {

var inviewObjects = [], viewportSize, viewportOffset,
d = document, w = window, documentElement = d.documentElement, timer;

$.event.special.inview = {
add: function(data) {
inviewObjects.push({ data: data, $element: $(this), element: this });
// Use setInterval in order to also make sure this captures elements within
// "overflow:scroll" elements or elements that appeared in the dom tree due to
// dom manipulation and reflow
// old: $(window).scroll(checkInView);
//
// By the way, iOS (iPad, iPhone, ...) seems to not execute, or at least delays
// intervals while the user scrolls. Therefore the inview event might fire a bit late there
//
// Don't waste cycles with an interval until we get at least one element that
// has bound to the inview event.
if (!timer && inviewObjects.length) {
timer = setInterval(checkInView, 250);
}
},

remove: function(data) {
for (var i=0; i<inviewObjects.length; i++) {
var inviewObject = inviewObjects[i];
if (inviewObject.element === this && inviewObject.data.guid === data.guid) {
inviewObjects.splice(i, 1);
break;
var inviewObjects = [], viewportSize, viewportOffset,
d = document, w = window, documentElement = d.documentElement, timer;

$.event.special.inview = {
add: function(data) {
inviewObjects.push({ data: data, $element: $(this), element: this });
// Use setInterval in order to also make sure this captures elements within
// "overflow:scroll" elements or elements that appeared in the dom tree due to
// dom manipulation and reflow
// old: $(window).scroll(checkInView);
//
// By the way, iOS (iPad, iPhone, ...) seems to not execute, or at least delays
// intervals while the user scrolls. Therefore the inview event might fire a bit late there
//
// Don't waste cycles with an interval until we get at least one element that
// has bound to the inview event.
if (!timer && inviewObjects.length) {
timer = setInterval(checkInView, 250);
}
},

remove: function(data) {
for (var i=0; i<inviewObjects.length; i++) {
var inviewObject = inviewObjects[i];
if (inviewObject.element === this && inviewObject.data.guid === data.guid) {
inviewObjects.splice(i, 1);
break;
}
}

// Clear interval when we no longer have any elements listening
if (!inviewObjects.length) {
clearInterval(timer);
timer = null;
}
}
};

function getViewportSize() {
var mode, domObject, size = { height: w.innerHeight, width: w.innerWidth };

// if this is correct then return it. iPad has compat Mode, so will
// go into check clientHeight/clientWidth (which has the wrong value).
if (!size.height) {
mode = d.compatMode;
if (mode || !$.support.boxModel) { // IE, Gecko
domObject = mode === 'CSS1Compat' ?
documentElement : // Standards
d.body; // Quirks
size = {
height: domObject.clientHeight,
width: domObject.clientWidth
};
}
}
}

// Clear interval when we no longer have any elements listening
if (!inviewObjects.length) {
clearInterval(timer);
timer = null;
}
return size;
}
};

function getViewportSize() {
var mode, domObject, size = { height: w.innerHeight, width: w.innerWidth };

// if this is correct then return it. iPad has compat Mode, so will
// go into check clientHeight/clientWidth (which has the wrong value).
if (!size.height) {
mode = d.compatMode;
if (mode || !$.support.boxModel) { // IE, Gecko
domObject = mode === 'CSS1Compat' ?
documentElement : // Standards
d.body; // Quirks
size = {
height: domObject.clientHeight,
width: domObject.clientWidth

function getViewportOffset() {
return {
top: w.pageYOffset || documentElement.scrollTop || d.body.scrollTop,
left: w.pageXOffset || documentElement.scrollLeft || d.body.scrollLeft
};
}
}

return size;
}
function checkInView() {
if (!inviewObjects.length) {
return;
}

function getViewportOffset() {
return {
top: w.pageYOffset || documentElement.scrollTop || d.body.scrollTop,
left: w.pageXOffset || documentElement.scrollLeft || d.body.scrollLeft
};
}
var i = 0, $elements = $.map(inviewObjects, function(inviewObject) {
var selector = inviewObject.data.selector,
$element = inviewObject.$element;
return selector ? $element.find(selector) : $element;
});

viewportSize = viewportSize || getViewportSize();
viewportOffset = viewportOffset || getViewportOffset();

// Don't ask me why because I haven't figured out yet:
// viewportOffset and viewportSize are sometimes suddenly null in Firefox 5.
// Even though it sounds weird:
// It seems that the execution of this function is interferred by the onresize/onscroll event
// where viewportOffset and viewportSize are unset
if (!viewportOffset || !viewportSize) {
return;
}

function checkInView() {
if (!inviewObjects.length) {
return;
for (; i<inviewObjects.length; i++) {
// Ignore elements that are not in the DOM tree
if (!$.contains(documentElement, $elements[i][0])) {
continue;
}

var $element = $($elements[i]);

for (var j=0; j<$element.length; j++) {
var elementSize = { height: $element[j].offsetHeight, width: $element[j].offsetWidth },
elementOffset = $($element[j]).offset(),
inView = $($element[j]).data('inview');

if (elementOffset.top + elementSize.height > viewportOffset.top &&
elementOffset.top < viewportOffset.top + viewportSize.height &&
elementOffset.left + elementSize.width > viewportOffset.left &&
elementOffset.left < viewportOffset.left + viewportSize.width) {
if (!inView) {
$($element[j]).data('inview', true).trigger('inview', [true]);
}
} else if (inView) {
$($element[j]).data('inview', false).trigger('inview', [false]);
}
}
}
}

var i = 0, $elements = $.map(inviewObjects, function(inviewObject) {
var selector = inviewObject.data.selector,
$element = inviewObject.$element;
return selector ? $element.find(selector) : $element;
$(w).on("scroll resize scrollstop", function() {
viewportSize = viewportOffset = null;
});

viewportSize = viewportSize || getViewportSize();
viewportOffset = viewportOffset || getViewportOffset();

for (; i<inviewObjects.length; i++) {
// Ignore elements that are not in the DOM tree
if (!$.contains(documentElement, $elements[i][0])) {
continue;
}

var $element = $($elements[i]),
elementSize = { height: $element[0].offsetHeight, width: $element[0].offsetWidth },
elementOffset = $element.offset(),
inView = $element.data('inview');

// Don't ask me why because I haven't figured out yet:
// viewportOffset and viewportSize are sometimes suddenly null in Firefox 5.
// Even though it sounds weird:
// It seems that the execution of this function is interferred by the onresize/onscroll event
// where viewportOffset and viewportSize are unset
if (!viewportOffset || !viewportSize) {
return;
}

if (elementOffset.top + elementSize.height > viewportOffset.top &&
elementOffset.top < viewportOffset.top + viewportSize.height &&
elementOffset.left + elementSize.width > viewportOffset.left &&
elementOffset.left < viewportOffset.left + viewportSize.width) {
if (!inView) {
$element.data('inview', true).trigger('inview', [true]);
}
} else if (inView) {
$element.data('inview', false).trigger('inview', [false]);
}
// IE < 9 scrolls to focused elements without firing the "scroll" event
if (!documentElement.addEventListener && documentElement.attachEvent) {
documentElement.attachEvent("onfocusin", function() {
viewportOffset = null;
});
}
}

$(w).on("scroll resize scrollstop", function() {
viewportSize = viewportOffset = null;
});

// IE < 9 scrolls to focused elements without firing the "scroll" event
if (!documentElement.addEventListener && documentElement.attachEvent) {
documentElement.attachEvent("onfocusin", function() {
viewportOffset = null;
});
}
}));