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(function ($) {
(function (factory) {
if (typeof define === 'function' && define.amd) {
// AMD
define(['jquery'], factory);
} else if (typeof module === 'object' && module.exports) {
// CommonJS
module.exports = factory(require('jquery'));
} else {
// Browser globals
factory(jQuery);
}
}(function ($) {
"use strict";
var defaults = {
percentage: true
};
var $window = $(window),
cache = [],
scrollEventBound = false,
lastPixelDepth = 0;
$.scrollDepth = function (options) {
var startTime = +new Date();
options = $.extend({}, defaults, options);
function sendEvent(label, action, scrollDistance, timing) {
var fieldsArray = {
hitType: 'event',
eventCategory: 'Analytify Scroll Depth',
eventAction: action,
eventLabel: label,
eventValue: 1,
nonInteraction: 1
};
if ( 'function' === typeof ga ) {
ga('send', fieldsArray);
}
if (arguments.length > 3) {
fieldsArray = {
hitType: 'timing',
timingCategory: 'Analytify Scroll Depth',
timingVar: action,
timingValue: timing,
timingLabel: label,
nonInteraction: 1
};
if ( 'function' === typeof ga ) {
ga('send', fieldsArray);
}
}
}
function calculateMarks(docHeight) {
return {
'25': parseInt(docHeight * 0.25, 10),
'50': parseInt(docHeight * 0.50, 10),
'75': parseInt(docHeight * 0.75, 10),
/* Cushion to trigger 100% event in iOS */
'100': docHeight - 5
};
}
function checkMarks(marks, scrollDistance, timing) {
// analytifyScroll.title
/* Check each active mark */
$.each(marks, function (key, val) {
if ($.inArray(key, cache) === -1 && scrollDistance >= val) {
sendEvent(analytifyScroll.permalink, key, scrollDistance, timing);
cache.push(key);
}
});
}
function rounded(scrollDistance) {
/* Returns String */
return (Math.floor(scrollDistance / 250) * 250).toString();
}
function init() {
bindScrollDepth();
}
/* Reset Scroll Depth with the originally initialized options */
$.scrollDepth.reset = function () {
cache = [];
lastPixelDepth = 0;
$window.off('scroll.scrollDepth');
bindScrollDepth();
};
/* Add DOM elements to be tracked */
$.scrollDepth.addElements = function (elems) {
if (typeof elems == "undefined" || !$.isArray(elems)) {
return;
}
$.merge(options.elements, elems);
/* If scroll event has been unbound from window, rebind */
if (!scrollEventBound) {
bindScrollDepth();
}
};
/* Remove DOM elements currently tracked */
$.scrollDepth.removeElements = function (elems) {
if (typeof elems == "undefined" || !$.isArray(elems)) {
return;
}
$.each(elems, function (index, elem) {
var inElementsArray = $.inArray(elem, options.elements);
var inCacheArray = $.inArray(elem, cache);
if (inElementsArray != -1) {
options.elements.splice(inElementsArray, 1);
}
if (inCacheArray != -1) {
cache.splice(inCacheArray, 1);
}
});
};
function throttle(func, wait) {
var context, args, result;
var timeout = null;
var previous = 0;
var later = function () {
previous = new Date;
timeout = null;
// console.log(result);
result = func.apply(context, args);
};
return function () {
var now = new Date;
if (!previous) previous = now;
var remaining = wait - (now - previous);
context = this;
args = arguments;
if (remaining <= 0) {
clearTimeout(timeout);
timeout = null;
previous = now;
result = func.apply(context, args);
} else if (!timeout) {
timeout = setTimeout(later, remaining);
}
return result;
};
}
/*
* Scroll Event
*/
function bindScrollDepth() {
scrollEventBound = true;
$window.on('scroll.scrollDepth', throttle(function () {
/*
* We calculate document and window height on each scroll event to
* account for dynamic DOM changes.
*/
var docHeight = $(document).height(),
winHeight = window.innerHeight ? window.innerHeight : $window.height(),
scrollDistance = $window.scrollTop() + winHeight,
/* Recalculate percentage marks */
marks = calculateMarks(docHeight),
/* Timing */
timing = +new Date - startTime;
checkMarks(marks, scrollDistance, timing);
}, 500));
}
init();
};
/* UMD export */
return $.scrollDepth;
}));
$.scrollDepth();
})(jQuery)