https://www.durlem.be/wp-content/plugins/elementor-pro/assets//lib/instant-page/instant-page.js?ver=4.2.1

1/*! instant.page v5.1.0 - (C) 2019-2020 Alexandre Dieulot - https://instant.page/license */
2( function (){
3	let mouseoverTimer
4	let lastTouchTimestamp
5	const prefetches = new Set()
6	const prefetchElement = document.createElement( 'link' )
7	const isSupported = prefetchElement.relList && prefetchElement.relList.supports && prefetchElement.relList.supports( 'prefetch' )
8		&& window.IntersectionObserver && 'isIntersecting' in IntersectionObserverEntry.prototype
9	const allowQueryString = 'instantAllowQueryString' in document.body.dataset
10	const allowExternalLinks = 'instantAllowExternalLinks' in document.body.dataset
11	const useWhitelist = 'instantWhitelist' in document.body.dataset
12	const mousedownShortcut = 'instantMousedownShortcut' in document.body.dataset
13	const DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION = 1111
14
15	let delayOnHover = 65
16	let useMousedown = false
17	let useMousedownOnly = false
18	let useViewport = false
19
20	if ('instantIntensity' in document.body.dataset) {
21		const intensity = document.body.dataset.instantIntensity
22
23		if (intensity.substr( 0, 'mousedown'.length ) == 'mousedown') {
24			useMousedown = true
25			if (intensity == 'mousedown-only') {
26				useMousedownOnly = true
27			}
28		} else if (intensity.substr( 0, 'viewport'.length ) == 'viewport') {
29			if (! ( navigator.connection && ( navigator.connection.saveData || ( navigator.connection.effectiveType && navigator.connection.effectiveType.includes( '2g' ) ) ) )) {
30				if (intensity == "viewport") {
31					/* Biggest iPhone resolution (which we want): 414 × 896 = 370944
32					 * Small 7" tablet resolution (which we don’t want): 600 × 1024 = 614400
33					 * Note that the viewport (which we check here) is smaller than the resolution due to the UI’s chrome */
34					if (document.documentElement.clientWidth * document.documentElement.clientHeight < 450000) {
35						useViewport = true
36					}
37				} else if (intensity == "viewport-all") {
38					useViewport = true
39				}
40			}
41		} else {
42			const milliseconds = parseInt( intensity )
43			if (! isNaN( milliseconds )) {
44				delayOnHover = milliseconds
45			}
46		}
47	}
48
49	if (isSupported) {
50		const eventListenersOptions = {
51			capture: true,
52			passive: true,
53		}
54
55		if (! useMousedownOnly) {
56			document.addEventListener( 'touchstart', touchstartListener, eventListenersOptions )
57		}
58
59		if (! useMousedown) {
60			document.addEventListener( 'mouseover', mouseoverListener, eventListenersOptions )
61		} else if (! mousedownShortcut) {
62			document.addEventListener( 'mousedown', mousedownListener, eventListenersOptions )
63		}
64
65		if (mousedownShortcut) {
66			document.addEventListener( 'mousedown', mousedownShortcutListener, eventListenersOptions )
67		}
68
69		if (useViewport) {
70			let triggeringFunction
71			if (window.requestIdleCallback) {
72				triggeringFunction = ( callback ) => {
73					requestIdleCallback( callback, {
74						timeout: 1500,
75					} )
76				}
77			} else {
78				triggeringFunction = ( callback ) => {
79					callback()
80				}
81			}
82
83			triggeringFunction( () => {
84				const intersectionObserver = new IntersectionObserver( ( entries ) => {
85					entries.forEach( ( entry ) => {
86						if (entry.isIntersecting) {
87							const linkElement = entry.target
88							intersectionObserver.unobserve( linkElement )
89							preload( linkElement.href )
90						}
91					} )
92				} )
93
94				document.querySelectorAll( 'a' ).forEach( ( linkElement ) => {
95					if (isPreloadable( linkElement )) {
96						intersectionObserver.observe( linkElement )
97					}
98				} )
99			} )
100		}
101	}
102
103	function touchstartListener( event ) {
104		/* Chrome on Android calls mouseover before touchcancel so `lastTouchTimestamp`
105		 * must be assigned on touchstart to be measured on mouseover. */
106		lastTouchTimestamp = performance.now()
107
108		const linkElement = event.target.closest( 'a' )
109
110		if (! isPreloadable( linkElement )) {
111			return
112		}
113
114		preload( linkElement.href )
115	}
116
117	function mouseoverListener( event ) {
118		if (performance.now() - lastTouchTimestamp < DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION) {
119			return
120		}
121
122		const linkElement = event.target.closest( 'a' )
123
124		if (! isPreloadable( linkElement )) {
125			return
126		}
127
128		linkElement.addEventListener( 'mouseout', mouseoutListener, { passive: true } )
129
130		mouseoverTimer = setTimeout( () => {
131			preload( linkElement.href )
132			mouseoverTimer = undefined
133		}, delayOnHover )
134	}
135
136	function mousedownListener( event ) {
137		const linkElement = event.target.closest( 'a' )
138
139		if (! isPreloadable( linkElement )) {
140			return
141		}
142
143		preload( linkElement.href )
144	}
145
146	function mouseoutListener( event ) {
147		if (event.relatedTarget && event.target.closest( 'a' ) == event.relatedTarget.closest( 'a' )) {
148			return
149		}
150
151		if (mouseoverTimer) {
152			clearTimeout( mouseoverTimer )
153			mouseoverTimer = undefined
154		}
155	}
156
157	function mousedownShortcutListener( event ) {
158		if (performance.now() - lastTouchTimestamp < DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION) {
159			return
160		}
161
162		const linkElement = event.target.closest( 'a' )
163
164		if (event.which > 1 || event.metaKey || event.ctrlKey) {
165			return
166		}
167
168		if (! linkElement) {
169			return
170		}
171
172		linkElement.addEventListener( 'click', function( event ) {
173			if (event.detail == 1337) {
174				return
175			}
176
177			event.preventDefault()
178		}, { capture: true, passive: false, once: true } )
179
180		const customEvent = new MouseEvent( 'click', { view: window, bubbles: true, cancelable: false, detail: 1337 } )
181		linkElement.dispatchEvent( customEvent )
182	}
183
184	function isPreloadable( linkElement ) {
185		if (! linkElement || ! linkElement.href) {
186			return
187		}
188
189		if (useWhitelist && ! ( 'instant' in linkElement.dataset )) {
190			return
191		}
192
193		if (! allowExternalLinks && linkElement.origin != location.origin && ! ( 'instant' in linkElement.dataset )) {
194			return
195		}
196
197		if (! [ 'http:', 'https:' ].includes( linkElement.protocol )) {
198			return
199		}
200
201		if (linkElement.protocol == 'http:' && location.protocol == 'https:') {
202			return
203		}
204
205		if (! allowQueryString && linkElement.search && ! ( 'instant' in linkElement.dataset )) {
206			return
207		}
208
209		if (linkElement.hash && linkElement.pathname + linkElement.search == location.pathname + location.search) {
210			return
211		}
212
213		if ('noInstant' in linkElement.dataset) {
214			return
215		}
216
217		return true
218	}
219
220	function preload( url ) {
221		if (prefetches.has( url )) {
222			return
223		}
224
225		const prefetcher = document.createElement( 'link' )
226		prefetcher.rel = 'prefetch'
227		prefetcher.href = url
228		document.head.appendChild( prefetcher )
229
230		prefetches.add( url )
231	}
232})();