← All changes | assets/js/preview.js +111 -33 5.2 → 6.2.2 View file →

		@@ -11,21 +11,97 @@
11	11	*
12	12	*/
13	13
14	14	jQuery(function($) {
	15	+ const MSHOT_REFRESH_DELAY = 6000;
	16	+ const MSHOT_REFRESH_QUERY_ARG = 'mainwp_mshot_refresh';
15	17
	18	+ function mainwp_preview_append_cache_bust(url, token) {
	19	+ if (!url) {
	20	+ return url;
	21	+ }
	22	+
	23	+ let separator = url.indexOf('?') === -1 ? '?' : '&';
	24	+
	25	+ return url + separator + MSHOT_REFRESH_QUERY_ARG + '=' + encodeURIComponent(token + '-' + Date.now());
	26	+ }
	27	+
	28	+ function mainwp_preview_get_button_mshot_url(element, requeue) {
	29	+ let attrName = requeue ? 'data-mainwp-mshot-requeue-src' : 'data-mainwp-mshot-src';
	30	+ let mshotUrl = $(element).attr(attrName);
	31	+
	32	+ if (mshotUrl) {
	33	+ return mshotUrl;
	34	+ }
	35	+
	36	+ let linkUrl = $(element).attr('preview-site-url');
	37	+
	38	+ if (!linkUrl) {
	39	+ return '';
	40	+ }
	41	+
	42	+ mshotUrl = '//s0.wp.com/mshots/v1/' + encodeURIComponent(linkUrl) + '?w=900';
	43	+
	44	+ if (requeue) {
	45	+ mshotUrl += '&requeue=true';
	46	+ }
	47	+
	48	+ return mshotUrl;
	49	+ }
	50	+
	51	+ function mainwp_preview_clear_image_recovery(img) {
	52	+ if (img && img.mainwpMshotRecoveryTimer) {
	53	+ clearTimeout(img.mainwpMshotRecoveryTimer);
	54	+ img.mainwpMshotRecoveryTimer = null;
	55	+ }
	56	+ }
	57	+
	58	+ function mainwp_preview_queue_image_recovery(img) {
	59	+ if (!img || img.dataset.mainwpMshotRecoveryRequested === '1') {
	60	+ return;
	61	+ }
	62	+
	63	+ let primarySrc = img.getAttribute('data-mainwp-mshot-src') || img.getAttribute('data-src') || img.getAttribute('src');
	64	+ let requeueSrc = img.getAttribute('data-mainwp-mshot-requeue-src');
	65	+
	66	+ if (!primarySrc || !requeueSrc) {
	67	+ return;
	68	+ }
	69	+
	70	+ img.dataset.mainwpMshotRecoveryRequested = '1';
	71	+ mainwp_preview_clear_image_recovery(img);
	72	+
	73	+ // Ask mShots to regenerate the thumbnail once, then retry the canonical URL.
	74	+ img.setAttribute('src', mainwp_preview_append_cache_bust(requeueSrc, 'requeue'));
	75	+ img.mainwpMshotRecoveryTimer = setTimeout(function () {
	76	+ img.setAttribute('src', mainwp_preview_append_cache_bust(primarySrc, 'reload'));
	77	+ }, MSHOT_REFRESH_DELAY);
	78	+ }
	79	+
	80	+ if (!window.mainwpPreviewImageRecoveryBound) {
	81	+ document.addEventListener('error', function (event) {
	82	+ let target = event.target;
	83	+
	84	+ if (target && target.tagName === 'IMG') {
	85	+ mainwp_preview_queue_image_recovery(target);
	86	+ }
	87	+ }, true);
	88	+
	89	+ window.mainwpPreviewImageRecoveryBound = true;
	90	+ }
	91	+
16	92	/**
17	93	* Init site preview function.
18	94	*/
19	95	window.mainwp_preview_init_event = function () {
20	96	let mshotRemovalTimer = null;
21		- let mshotSecondTryTimer = null
22		- let mshotThirdTryTimer = null
23		-
	97	+ let mshotSecondTryTimer = null;
	98	+ let mshotThirdTryTimer = null;
	99	+ let previewTableSelector = '.mainwp-with-preview-table';
24	100	let mshotEnabledLinkSelector = 'td span.mainwp-preview-item';
25	101
26	102	// Show a preview image of the hovered URL.
27		- $('.mainwp-with-preview-table').on('click', mshotEnabledLinkSelector, function () {
	103	+ $(previewTableSelector).off('.mainwpPreview').on('click.mainwpPreview', mshotEnabledLinkSelector, function () {
28	104	clearTimeout(mshotRemovalTimer);
29	105
30	106	if ($('.mainwp-preview-mshot').length > 0) {
31	107	if ($('.mainwp-preview-mshot:first').data('link') == this) {
		@@ -33,8 +109,10 @@
33	109	return;
34	110	}
35	111	else {
36	112	// A new link is being hovered, so remove the old preview.
	113	+ let existingImage = $('.mainwp-preview-mshot .mshot-image').get(0);
	114	+ mainwp_preview_clear_image_recovery(existingImage);
37	115	$('.mainwp-preview-mshot').remove();
38	116	}
39	117	}
40	118
		@@ -40,11 +118,21 @@
40	118
41	119	clearTimeout(mshotSecondTryTimer);
42	120	clearTimeout(mshotThirdTryTimer);
43	121
44		- let thisHref = $(this).attr('preview-site-url');
	122	+ let primarySrc = mainwp_preview_get_button_mshot_url(this, false);
	123	+ let requeueSrc = mainwp_preview_get_button_mshot_url(this, true);
	124	+ let $image = $('<img />', {
	125	+ src: primarySrc,
	126	+ width: 450,
	127	+ height: 338,
	128	+ class: 'mshot-image'
	129	+ });
	130	+ let mShot = $('<div class="mainwp-preview-mshot mshot-container"><div class="mshot-arrow"></div></div>');
45	131
46		- let mShot = $('<div class="mainwp-preview-mshot mshot-container"><div class="mshot-arrow"></div><img src="' + mainwp_preview_mshot_url(thisHref) + '" width="450" height="338" class="mshot-image" /></div>');
	132	+ $image.attr('data-mainwp-mshot-src', primarySrc);
	133	+ $image.attr('data-mainwp-mshot-requeue-src', requeueSrc);
	134	+ mShot.append($image);
47	135	mShot.data('link', this);
48	136
49	137	let offset = $(this).offset();
50	138
		@@ -56,17 +144,17 @@
56	144	// These retries appear to be superfluous if .mshot-image has already loaded, but it's because mShots
57	145	// can return a "Generating thumbnail..." image if it doesn't have a thumbnail ready, so we need
58	146	// to retry to see if we can get the newly generated thumbnail.
59	147	mshotSecondTryTimer = setTimeout(function () {
60		- mShot.find('.mshot-image').attr('src', mainwp_preview_mshot_url(thisHref, 2));
61		- }, 6000);
	148	+ mShot.find('.mshot-image').attr('src', mainwp_preview_append_cache_bust(primarySrc, 'retry-2'));
	149	+ }, MSHOT_REFRESH_DELAY);
62	150
63	151	mshotThirdTryTimer = setTimeout(function () {
64		- mShot.find('.mshot-image').attr('src', mainwp_preview_mshot_url(thisHref, 3));
65		- }, 12000);
	152	+ mShot.find('.mshot-image').attr('src', mainwp_preview_append_cache_bust(primarySrc, 'retry-3'));
	153	+ }, MSHOT_REFRESH_DELAY * 2);
66	154
67	155	$('body').append(mShot);
68		- }).on('mouseover', 'tr', function () {
	156	+ }).on('mouseover.mainwpPreview', 'tr', function () {
69	157	// When the mouse hovers over a row, begin preloading mshots for links.
70	158	let linksToPreloadMshotsFor = $(this).find(mshotEnabledLinkSelector);
71	159
72	160	linksToPreloadMshotsFor.each(function () {
		@@ -72,19 +160,22 @@
72	160	linksToPreloadMshotsFor.each(function () {
73	161	// Don't attempt to preload an mshot for a single link twice. Browser caching should cover this, but in case of
74	162	// race conditions, save a flag locally when we've begun trying to preload one.
75	163	if (!$(this).data('mainwp-preview-mshot-preloaded')) {
76		- mainwp_preview_preload_mshot($(this).attr('preview-site-url'));
	164	+ mainwp_preview_preload_mshot(this);
77	165	$(this).data('mainwp-preview-mshot-preloaded', true);
78	166	}
79	167	});
80	168	});
81	169
82		- $(document).on('mouseup', function () {
	170	+ $(document).off('mouseup.mainwpPreview').on('mouseup.mainwpPreview', function () {
83	171	if ($('.mainwp-preview-mshot').length > 0) {
84	172	mshotRemovalTimer = setTimeout(function () {
85	173	clearTimeout(mshotSecondTryTimer);
86	174	clearTimeout(mshotThirdTryTimer);
	175	+ let previewImage = $('.mainwp-preview-mshot .mshot-image').get(0);
	176	+
	177	+ mainwp_preview_clear_image_recovery(previewImage);
87	178	$('.mainwp-preview-mshot').remove();
88	179	}, 100);
89	180	}
90	181	});
		@@ -93,30 +184,17 @@
93	184	// init preview.
94	185	mainwp_preview_init_event();
95	186
96	187	/**
97		- * Generate an mShot URL if given a link URL.
	188	+ * Begin loading an mShot preview of a link.
98	189	*
99		- * @param string linkUrl
100		- * @param int retry If retrying a request, the number of the retry.
101		- * @return string The mShot URL;
	190	+ * @param object linkElement Preview trigger element.
102	191	*/
103		- function mainwp_preview_mshot_url(linkUrl, retry) {
104		- let mshotUrl = '//s0.wordpress.com/mshots/v1/' + encodeURIComponent(linkUrl) + '?w=900';
	192	+ function mainwp_preview_preload_mshot(linkElement) {
	193	+ let img = new Image();
	194	+ let primarySrc = mainwp_preview_get_button_mshot_url(linkElement, false);
105	195
106		- if (retry) {
107		- mshotUrl += '&r=' + encodeURIComponent(retry);
	196	+ if (primarySrc) {
	197	+ img.src = primarySrc;
108	198	}
109		-
110		- return mshotUrl;
111		- }
112		-
113		- /**
114		- * Begin loading an mShot preview of a link.
115		- *
116		- * @param string linkUrl
117		- */
118		- function mainwp_preview_preload_mshot(linkUrl) {
119		- let img = new Image();
120		- img.src = mainwp_preview_mshot_url(linkUrl);
121	199	}
122	200	});