Tweet
Tweet

Slide 1

Slide 1 text

@adunkman Executing JavaScript Across Browser Contexts

Slide 2

Slide 2 text

GraphQL

Slide 3

Slide 3 text

No content

Slide 4

Slide 4 text

No content

Slide 5

Slide 5 text

@adunkman Standard Browser APIs

Slide 6

Slide 6 text

@adunkman Between Tabs Outside Tabs

Slide 7

Slide 7 text

No content

Slide 8

Slide 8 text

Washington, DC

Slide 9

Slide 9 text

Pittsburgh, PA

Slide 10

Slide 10 text

Los Angeles, CA

Slide 11

Slide 11 text

New Paltz, NY

Slide 12

Slide 12 text

Mayne Island, BC

Slide 13

Slide 13 text

No content

Slide 14

Slide 14 text

No content

Slide 15

Slide 15 text

No content

Slide 16

Slide 16 text

@adunkman You need to write well to program

Slide 17

Slide 17 text

@adunkman You don’t need to hear to program

Slide 18

Slide 18 text

@adunkman Access to learning resources

Slide 19

Slide 19 text

No content

Slide 20

Slide 20 text

No content

Slide 21

Slide 21 text

No content

Slide 22

Slide 22 text

No content

Slide 23

Slide 23 text

No content

Slide 24

Slide 24 text

@adunkman confa11y.com

Slide 25

Slide 25 text

@adunkman confally.com

Slide 26

Slide 26 text

@adunkman a11yconf.com

Slide 27

Slide 27 text

@adunkman allyconf.com

Slide 28

Slide 28 text

No content

Slide 29

Slide 29 text

No content

Slide 30

Slide 30 text

@adunkman Pull Request Opportunities

Slide 31

Slide 31 text

No content

Slide 32

Slide 32 text

@adunkman Standard Browser APIs

Slide 33

Slide 33 text

No content

Slide 34

Slide 34 text

No content

Slide 35

Slide 35 text

No content

Slide 36

Slide 36 text

No content

Slide 37

Slide 37 text

No content

Slide 38

Slide 38 text

No content

Slide 39

Slide 39 text

No content

Slide 40

Slide 40 text

No content

Slide 41

Slide 41 text

No content

Slide 42

Slide 42 text

No content

Slide 43

Slide 43 text

No content

Slide 44

Slide 44 text

No content

Slide 45

Slide 45 text

No content

Slide 46

Slide 46 text

@adunkman

Slide 47

Slide 47 text

@adunkman

Slide 48

Slide 48 text

@adunkman Cache-Control

Slide 49

Slide 49 text

@adunkman

Slide 50

Slide 50 text

@adunkman There’s more to the web than web pages

Slide 51

Slide 51 text

@adunkman Browser Contexts

Slide 52

Slide 52 text

@adunkman Window Sandbox

Slide 53

Slide 53 text

@adunkman Domain-Level Objects

Slide 54

Slide 54 text

No content

Slide 55

Slide 55 text

No content

Slide 56

Slide 56 text

@adunkman Why isn’t this better?

Slide 57

Slide 57 text

@adunkman document.cookie

Slide 58

Slide 58 text

@adunkman –Jen Kramer “It’s back again baby! Everything old is new again!”

Slide 59

Slide 59 text

Bob Dunkman c. 1977

Slide 60

Slide 60 text

Bob Dunkman c. 2016

Slide 61

Slide 61 text

@adunkman document.cookie

Slide 62

Slide 62 text

In document.cookie = cookieName + "=" + encodeURIComponent(json);

Slide 63

Slide 63 text

In Out document.cookie = cookieName + "=" + encodeURIComponent(json); var regex = new RegExp( "(?:(?:^|.*;)\\s*" + n + "\\s*\\=\\s*([^;]*).*$)|^.*$");

Slide 64

Slide 64 text

In Out Detect document.cookie = cookieName + "=" + encodeURIComponent(json); var regex = new RegExp( "(?:(?:^|.*;)\\s*" + n + "\\s*\\=\\s*([^;]*).*$)|^.*$"); setInterval(checkForChanges, pollingInterval);

Slide 65

Slide 65 text

@adunkman Please don’t.

Slide 66

Slide 66 text

@adunkman document.cookie localStorage

Slide 67

Slide 67 text

@adunkman QuotaExceededError

Slide 68

Slide 68 text

@adunkman document.cookie localStorage

Slide 69

Slide 69 text

In localStorage.setItem( keyName, json);

Slide 70

Slide 70 text

In Out localStorage.setItem( keyName, json); localStorage.getItem( keyName);

Slide 71

Slide 71 text

In Out Detect localStorage.setItem( keyName, json); localStorage.getItem( keyName); window.addEventListener( “storage", function (event) { ...

Slide 72

Slide 72 text

No content

Slide 73

Slide 73 text

var tabId = Math.random(); video.addEventListener("play", function () { localStorage.setItem("playing_tab", tabId); }); window.addEventListener("storage", function (event) { var isThisKey = event.key === "playing_tab"; var notThisTab = event.newValue !== tabId; if (isThisKey && notThisTab) { video.pause(); } });

Slide 74

Slide 74 text

var tabId = Math.random(); video.addEventListener("play", function () { localStorage.setItem("playing_tab", tabId); }); window.addEventListener("storage", function (event) { if (event.key === "playing_tab" && event.newValue !== tabId) { video.pause(); } });

Slide 75

Slide 75 text

var tabId = Math.random(); video.addEventListener("play", function () { localStorage.setItem("playing_tab", tabId); }); window.addEventListener("storage", function (event) { if (event.key === "playing_tab" && event.newValue !== tabId) { video.pause(); } }); 9

Slide 76

Slide 76 text

No content

Slide 77

Slide 77 text

@adunkman Between Tabs Outside Tabs

Slide 78

Slide 78 text

@adunkman WebWorker

Slide 79

Slide 79 text

@adunkman SharedWorker

Slide 80

Slide 80 text

@adunkman Tab 1 Tab 2 Tab 3 worker.js 1 worker.js 2 worker.js 3

Slide 81

Slide 81 text

@adunkman Tab 1 Tab 2 Tab 3 worker.js 1

Slide 82

Slide 82 text

No content

Slide 83

Slide 83 text

No content

Slide 84

Slide 84 text

No content

Slide 85

Slide 85 text

No content

Slide 86

Slide 86 text

$

Slide 87

Slide 87 text

No content

Slide 88

Slide 88 text

External Page

Slide 89

Slide 89 text

External Page Harvest Script

Slide 90

Slide 90 text

External Page Harvest Script

Slide 91

Slide 91 text

External Page Harvest Script

Slide 92

Slide 92 text

External Page Harvest Script SharedWorker

Slide 93

Slide 93 text

External Page Harvest Script SharedWorker WebSocket

Slide 94

Slide 94 text

No content

Slide 95

Slide 95 text

No content

Slide 96

Slide 96 text

No content

Slide 97

Slide 97 text

No content

Slide 98

Slide 98 text

No content

Slide 99

Slide 99 text

No content

Slide 100

Slide 100 text

No content

Slide 101

Slide 101 text

@adunkman SharedWorker

Slide 102

Slide 102 text

@adunkman Great for sharing processing and resources Not great for 
 working in Safari

Slide 103

Slide 103 text

@adunkman SharedWorker

Slide 104

Slide 104 text

@adunkman ServiceWorker

Slide 105

Slide 105 text

@adunkman Service workers essentially act as proxy servers that sit between web applications, and the browser and network (when available). … They will also allow access to push notifications and background sync APIs. –MDN

Slide 106

Slide 106 text

@adunkman Service workers essentially act as proxy servers that sit between web applications, and the browser and network (when available). … They will also allow access to push notifications and background sync APIs. –MDN

Slide 107

Slide 107 text

@adunkman A service worker is an event- driven worker registered against an origin and a path. –MDN

Slide 108

Slide 108 text

@adunkman A service worker is an event- driven worker registered against an origin and a path. –MDN

Slide 109

Slide 109 text

@adunkman Service workers are a new browser feature that provide event-driven scripts that run independently of web pages. –W3C

Slide 110

Slide 110 text

@adunkman Service workers are a new browser feature that provide event-driven scripts that run independently of web pages. –W3C

Slide 111

Slide 111 text

@adunkman A service worker is a process which is tied to domain events rather than to a browsing context. –me

Slide 112

Slide 112 text

@adunkman Tab 1 worker.js 1 Domain Events worker.js 1

Slide 113

Slide 113 text

@adunkman Domain Events worker.js 1 push sync fetch

Slide 114

Slide 114 text

@adunkman “push” event

Slide 115

Slide 115 text

No content

Slide 116

Slide 116 text

No content

Slide 117

Slide 117 text

No content

Slide 118

Slide 118 text

No content

Slide 119

Slide 119 text

No content

Slide 120

Slide 120 text

No content

Slide 121

Slide 121 text

No content

Slide 122

Slide 122 text

No content

Slide 123

Slide 123 text

@adunkman Notification Service

Slide 124

Slide 124 text

Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); });

Slide 125

Slide 125 text

Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); }); Tab 1 worker.js 1

Slide 126

Slide 126 text

Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); }); Tab 1 worker.js 1 (new version)

Slide 127

Slide 127 text

Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); }); Tab 1 worker.js 1 Tab 2 (new version)

Slide 128

Slide 128 text

Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); }); Tab 1 worker.js 1 Tab 2 (old) worker.js 1 (new version)

Slide 129

Slide 129 text

Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); });

Slide 130

Slide 130 text

Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); }); Tab 2 (new) worker.js 1

Slide 131

Slide 131 text

Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); }); Worker self.addEventListener("install", function (event) { self.skipWaiting(); });

Slide 132

Slide 132 text

Worker Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); }); self.addEventListener("push", function (event) { console.log("message", event); }); self.addEventListener("install", function (event) { self.skipWaiting(); });

Slide 133

Slide 133 text

No content

Slide 134

Slide 134 text

@adunkman “push” event

Slide 135

Slide 135 text

@adunkman Browser message server (like native app) Wakes ServiceWorker to process event

Slide 136

Slide 136 text

No content

Slide 137

Slide 137 text

@adunkman “sync” event

Slide 138

Slide 138 text

No content

Slide 139

Slide 139 text

No content

Slide 140

Slide 140 text

No content

Slide 141

Slide 141 text

No content

Slide 142

Slide 142 text

No content

Slide 143

Slide 143 text

No content

Slide 144

Slide 144 text

Worker Page navigator.serviceWorker.ready .then(function (reg) { return reg.sync.register("syncTime"); }); self.addEventListener("sync", function (event) { if (event.tag === "syncTime") { event.waitUntil(stuff()); } });

Slide 145

Slide 145 text

Tab 1 worker.js 1

Slide 146

Slide 146 text

Tab 1 worker.js 1 sync “syncTime”

Slide 147

Slide 147 text

Tab 1 worker.js 1 sync “syncTime” Browser

Slide 148

Slide 148 text

worker.js 1 Browser

Slide 149

Slide 149 text

worker.js 1 Browser

Slide 150

Slide 150 text

@adunkman “sync” event

Slide 151

Slide 151 text

@adunkman Great for backgrounding a sync process, even in limited or no connectivity

Slide 152

Slide 152 text

No content

Slide 153

Slide 153 text

@adunkman “fetch” event

Slide 154

Slide 154 text

No content

Slide 155

Slide 155 text

No content

Slide 156

Slide 156 text

Worker self.addEventListener("fetch", function (event) { console.log(event.request.url); event.respondWith( caches.match(event.request) .then(function (response) { if (response) { return response; } return fetch(event.request) .then(function (response) { return response; }).catch(function (error) { throw error; }); }) ); });

Slide 157

Slide 157 text

Worker self.addEventListener("fetch", function (event) { console.log(event.request.url); event.respondWith( caches.match(event.request) .then(function (response) { if (response) { return response; } return fetch(event.request) .then(function (response) { return response; }).catch(function (error) { throw error; }); }) ); });

Slide 158

Slide 158 text

Worker self.addEventListener("fetch", function (event) { console.log(event.request.url); event.respondWith( caches.match(event.request) .then(function (response) { if (response) { return response; } return fetch(event.request) .then(function (response) { return response; }).catch(function (error) { throw error; }); }) ); });

Slide 159

Slide 159 text

Worker self.addEventListener("fetch", function (event) { console.log(event.request.url); event.respondWith( caches.match(event.request) .then(function (response) { if (response) { return response; } return fetch(event.request) .then(function (response) { return response; }).catch(function (error) { throw error; }); }) ); });

Slide 160

Slide 160 text

Worker self.addEventListener("fetch", function (event) { console.log(event.request.url); event.respondWith( caches.match(event.request) .then(function (response) { if (response) { return response; } return fetch(event.request) .then(function (response) { return response; }).catch(function (error) { throw error; }); }) ); });

Slide 161

Slide 161 text

Worker self.addEventListener("fetch", function (event) { console.log(event.request.url); event.respondWith( caches.match(event.request) .then(function (response) { if (response) { return response; } return fetch(event.request) .then(function (response) { return response; }).catch(function (error) { throw error; }); }) ); });

Slide 162

Slide 162 text

@adunkman “fetch” event

Slide 163

Slide 163 text

@adunkman Programmatic access to browser cache Replaces AppCache Allows custom offline logic Is completely encapsulated

Slide 164

Slide 164 text

No content

Slide 165

Slide 165 text

@adunkman ServiceWorker

Slide 166

Slide 166 text

@adunkman HTTPS/localhost only Not persistent Not tied to browser context Domain events

Slide 167

Slide 167 text

No content

Slide 168

Slide 168 text

@adunkman There’s more to the web than web pages

Slide 169

Slide 169 text

getharvest.com/careers dunkman.me/talks/fsf @adunkman