Thinking Offline at GDG DevFest London

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THINKING OFFLINE

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Phil Nash @philnash http://philna.sh [email protected]

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THINKING OFFLINE

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AN INTRODUCTION TO SERVICE WORKERS

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SERVICE WORKERS ARE SCRIPTS THAT INTERCEPT NETWORK REQUESTS

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SO WEB DEVELOPERS CAN TREAT THE NETWORK AS AN ENHANCEMENT

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AND PROVIDE OFFLINE EXPERIENCES FOR USERS OF WEB APPLICATIONS

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AND PROVIDE OFFLINE EXPERIENCES FOR USERS OF WEB APPLICATIONS

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AND PROVIDE BETTER EXPERIENCES FOR USERS OF WEB APPLICATIONS

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LET'S MAKE EVERYTHING OFFLINE!

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A NON-TRIVIAL APPLICATION

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I HAVE A CONFESSION

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“A WEB APPLICATION THAT WAS BUILT FROM THE GROUND UP AS OFFLINE FIRST”

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PROGRESSIVE ENHANCEMENT

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WHAT DO WE NEED?

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BASE EXPERIENCE

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STATIC ASSETS

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OFFLINE PAGES

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BACKGROUND SYNC

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BASE EXPERIENCE

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GOOD NEWS!

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STATIC ASSETS

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DEMO

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THE SERVICE WORKER LIFECYCLE

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INSTALLING INSTALLED ACTIVATING ACTIVATED REDUNDANT

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CACHE INVALIDATION

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DEMO

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n a v i g a t o r . s e r v i c e W o r k e r . r e g i s t e r ( " / s w . j s " ) . t h e n ( f u n c t i o n ( r e g ) { c o n s o l e . l o g ( " " ) ; r e g . a d d E v e n t L i s t e n e r ( " u p d a t e f o u n d " , f u n c t i o n ( ) { v a r w o r k e r = r e g . i n s t a l l i n g r e g . i n s t a l l i n g . a d d E v e n t L i s t e n e r ( " s t a t e c h a n g e " , f u n c t i o n ( e ) { i f ( w o r k e r . s t a t e = = " i n s t a l l e d " ) { w o r k e r . p o s t M e s s a g e ( { a c t i o n : " u p d a t e " } ) ; } } ) } ) ; } ) ; 0 1 . 0 2 . 0 3 . 0 4 . 0 5 . 0 6 . 0 7 . 0 8 . 0 9 . 1 0 . 1 1 .

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s e l f . s k i p W a i t i n g ( ) ;

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v a r s w = n a v i g a t o r . s e r v i c e W o r k e r ; s w . a d d E v e n t L i s t e n e r ( " c o n t r o l l e r c h a n g e " , f u n c t i o n ( ) { w i n d o w . l o c a t i o n . r e l o a d ( ) ; } ) ; 0 1 . 0 2 . 0 3 . 0 4 .

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TAKE BACK CONTROL

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OFFLINE PAGES

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DATA VS FILES

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“FOR URL ADDRESSABLE RESOURCES, USE THE CACHE API. FOR ALL OTHER DATA, USE INDEXEDDB”

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http://bit.ly/cache-vs-db

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IndexedDB

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IDB-PROMISES LOCALFORAGE IDB-KEYVAL DEXIE POUCHDB

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IDB-PROMISES LOCALFORAGE IDB-KEYVAL DEXIE POUCHDB

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v a r d b = n e w D e x i e ( " m e s s a g e S t o r e " , { a u t o O p e n : t r u e } ) ; d b . v e r s i o n ( 1 ) . s t o r e s ( { m e s s a g e s : " + + , c r e a t e d A t " } ) ; 0 1 . 0 2 . 0 3 . 0 4 . 0 5 . 0 6 .

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d b . t r a n s a c t i o n ( " w " , d b . m e s s a g e s , f u n c t i o n ( ) { d b . m e s s a g e s . p u t ( { f r o m : F R O M _ N U M B E R , t o : T O _ N U M B E R , c r e a t e A t : n e w D a t e ( ) , b o d y : " S e r v i c e W o r k e r s r o c k " } ) . t h e n ( f u n c t i o n ( m e s s a g e ) { c o n s o l e . l o g ( " " ) ; } ) ; } ) ; 0 1 . 0 2 . 0 3 . 0 4 . 0 5 . 0 6 . 0 7 . 0 8 . 0 9 . 1 0 .

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d b . t r a n s a c t i o n ( " r " , d b . m e s s a g e s , f u n c t i o n ( ) { d b . m e s s a g e s . e a c h ( f u n c t i o n ( i t e m , c u r s o r ) { r e n d e r ( i t e m ) ; } ) ; } ) ; 0 1 . 0 2 . 0 3 . 0 4 . 0 5 .

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RENDER ON THE SERVER

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APP SHELL

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BOOTSTRAP FROM THE PAGE OR THE DATABASE

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UNIVERSAL JAVASCRIPT

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BACKGROUND SYNC

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DEMO

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r e g . s y n c . r e g i s t e r ( ' s e n t M e s s a g e ' ) ;

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s e l f . a d d E v e n t L i s t e n e r ( ' s y n c ' , f u n c t i o n ( e v e n t ) { / / d o t h e t h i n g } ) ; 0 1 . 0 2 . 0 3 .