MICROFRONTENDS
@tomastrajan
BY
Surprisingly Easy Way To Build
WITH ANGULAR
bit.ly/2Q9MJqs
@tomastrajan
TOMAS TRAJAN
CONSULTANT, ANGULAR TRAINER, BLOGGER, SPEAKER...
INTERNATIONAL SPEAKER
@tomastrajan
ANGULAR
TRAINER
๐ medium.com/@tomastrajan
ANGULAR BLOG
@tomastrajan
๐ github.com/tomastrajan
โ best practices
โ Angular Material components
โ NgRx 8 state management
โ theming support
โ 30+ contributors
โ unit / e2e testing
ANGULAR STARTER
1800+
โญ
@tomastrajan
@releasebutler
๐ releasebutler.now.sh
MAKER OF
@tomastrajan
@tomastrajan
TELL ME ABOUT YOURSELF
@tomastrajan
REFRESHER
@tomastrajan
VANILLA WEB
๐SPAGHETTI CODE
@tomastrajan
COMPONENTS*
CREATED WITH THE HELP OF FRONTEND FRAMEWORKS AND LIBRARIES....
@tomastrajan
<p> vs <todo-item>
- show text
- use styling
- some css animations
- show text
- use styling
- some css animations
- toggle
- assign to user
- set deadline
- tag
- ....
@tomastrajan
COMPONENTS
- re-usability
- encapsulation
- reduction of complexity
- framework / library specific
- not reusable across projects
@tomastrajan
WEBCOMPONENTS
@tomastrajan
...GETS CRAZY
PRETTY FAST
- vanilla DOM APIs
- manual management of props and attributes
- life-cycle hooks
- by default only primitive values in attributes
- custom events are verbose
- methods vs declarative data passing
@tomastrajan
BUT...
@tomastrajan
WEB COMPONENTS
- more reusable
- framework independent
- better encapsulation (shadow DOM)
- future proof (in theory)
@tomastrajan
ANGULAR ELEMENTS
...AKA WRITE ANGULAR AND GET VANILLA WEBCOMPONENTS
@tomastrajan
ANGULAR ELEMENTS
@tomastrajan
ANGULAR ELEMENTS
@tomastrajan
STORY TIME
@tomastrajan
THE MONOLITH
@tomastrajan
THE 80+
ANGULAR SPAS
@tomastrajan
library
@tomastrajan
@tomastrajan
library
@tomastrajan
@tomastrajan
THE LIB
@tomastrajan
ELEMENTS ALREADY WORK SO WHY LIB?
@tomastrajan
BY DEFAULT WE HAVE 2 OPTIONS
@tomastrajan
๐ EAGER LOADING
๐ STANDARD ANGULAR
TEMPLATE BINDINGS
@tomastrajan
๐ LAZY LOADING
๐IMPERATIVE AttRIbuTE
AND EVENT BINDING
@tomastrajan
WHAT WE WANT?
@tomastrajan
LAZY LOADING
&
STANDARD ANGULAR TEMPLATE BINDINGS
@tomastrajan
๐ LAZY LOADING
๐ STANDARD ANGULAR
TEMPLATE BINDINGS
@tomastrajan
HOW DOES IT WORK?
@tomastrajan
- The * signifies Angular structural directive
- The element is removed from the DOM
- Directive can inject the element template reference in its constructor
- And use it to render element back once the elements bundle was loaded!
@tomastrajan
STANDARD ANGULAR DIRECTIVE
SIMPLIFIED VERSION ๐
@tomastrajan
RETRIEVE URL
<some-component
*axLazyElement="https://my-org.com/some-component.js">
</some-component>
@tomastrajan
INJECT TEMPLATE REFERENCE
...AND A SERVICE WHICH
IMPLEMENTS ELEMENT
LOADING (CREATE SCRIPT TAG)
@tomastrajan
RETRIEVE ELEMENT TAG FROM THE TEMPLATE
@tomastrajan
CALL LOADER SERVICE WITH URL & TAG
@tomastrajan
ONCE LOADED, RENDER TEMPLATE BACK TO THE DOM
@tomastrajan
AND HANDLE POTENTIAL ERRORS ๐
@tomastrajan
BUT WHAT ABOUT THE SERVICE?
@tomastrajan
STANDARD ANGULAR SERVICE
VERY SIMPLIFIED VERSION ๐
@tomastrajan
CREATE URL / PROMISE MAP
TO PREVENT MULTIPLE DOWNLOADS OF A SINGLE ELEMENT BUNDLE!
@tomastrajan
ADD LOADELEMENT METHOD AS USED IN THE *AXLAZYELEMENT DIRECTIVE
@tomastrajan
WHEN LOADING, FIRST CHECK IF WE ALREADY HAVE SUCH AN URL IN THE REGISTRY...
@tomastrajan
AND IF CASE IF YES RETURN THE STORED PROMISE
@tomastrajan
ELSE WE HAVE TO DOWNLOAD ELEMENTS BUNDLE FOR THE FIRST TIME
@tomastrajan
@tomastrajan
IMMEDIATELY STORE URL & THE NEW PROMISE IN THE REGISTRY...
NEXT, we want to DOWNLOAD THE ELEMENT BUNDLE USING <SCRIPT> TAG
@tomastrajan
@tomastrajan
...NOTIFY THE PROMISE ONCE LOADED (or ERROR)
... SET ELEMENT BUNDLE URL
@tomastrajan
...APPEND THE SCRIPT TAG TO TRIGGER LOADING
@tomastrajan
...AND RETURN THE PROMISE!
@tomastrajan
BY THE WAY...
THIS ALSO WORKS WITH ANGULAR IVY๐ฟ
@tomastrajan
WE SAID ITS LAZY, BUT HOW LAZY?!
@tomastrajan
THE ELEMENT IS HIDDEN BEHING *ngIF
WHEN IT WILL BE LOADED?
WHAT DO YOU THINK?๐
@tomastrajan
THAT's RIGHT...
THE ELEMENT BUNDLE WILL BE LOADED ONLY ONCE THE *NGIF EVALUATES TO TRUE AND ELEMENT IS RENDERED!
@tomastrajan
SO YEAH, AS LAZY AS IT GETS ๐น
@tomastrajan
DEVELOPER EXPERIENCE
@tomastrajan
CONFIGURATION
PRE-CONFIGURE URL
LOADING & ERROR STATE COMPONENTS...
AND EVEN PRE-LOADING!
PER MODULE...
AND USE WITH EASE!
@tomastrajan
CONFIGURATION
POSSIBLE TO OVERRIDE LOCALLY IN THE TEMPLATE
@tomastrajan
BACK TO OUR REQUIREMENT...
๐ SOLVED !
@tomastrajan
COOL, BUT THAT'S NOT REALLY MICROFRONTENDS, RIGHT?
@tomastrajan
COMMUNITY FEEDBACK
THIS NEEDS TO BE MORE DYNAMIC!
I WANT LOAD CONFIG FROM BACKEND DURING RUNTIME!
I WANT TO CONFIGURE TAG USING A VARIABLE
WE WANT TO BUILD MICROFRONTEEEENDS!
@tomastrajan
OK...
@tomastrajan
HERE YOU GO...
DYNAMIC TAG
STANDARD ANguLAR TEMPLATE BINDING WORKS STILL!
@tomastrajan
RETRIEVE CONFIG FROM BACKEND...
RENDER MULTIPLE DYNAMIC ELEMENTS...
CONFIG EXAMPLE...
@tomastrajan
HOW DOES IT WORK?
@tomastrajan
ALMOST THE SAME AS
*AXLAZYELEMENT BUT...
WE HAVE TO OVERRIDE ELEMENT NAME IN THE TEMPLATE...
@tomastrajan
UNFORTUNATELLY...
NOT YET READY FOR ANGULAR IVY๐ฟ
BUT...
@tomastrajan
IT SHOULD BE POSSIBLE USING IVY RENDERER
@tomastrajan
KNOWN ISSUES ?
WITH ZONE.js...
STORE PARENT ZONE ON THE WINDOW...
... and pass it into element AT bootstrap
@tomastrajan
QUICK DEMO TIME
@tomastrajan
LEARN MORE
- Official Angular elements documentation
- @angular-extensions/elements library docs
- Web components documentation (MDN)
- Change detection issue and NgZone sharing (GitHub angular/angular issue)
@tomastrajan
GET IN TOUCH
www.tomastrajan.com
@tomastrajan
GET IN TOUCH
npx tomastrajan
@tomastrajan
TAKEAWAYS
There are many real world use cases
ANGULAR IS A GREAT CHOICE FOR MICROFRONTENDs
CHECK OUT @ANGULAR-EXTENSIONS/ELEMENTS LIB
ALSO LET'S MEET AND CHAT ABOUT
@tomastrajan
THANK YOU FOR YOUR ATTENTION!
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MICROFRONTENDS @tomastrajan BY Surprisingly Easy Way To Build WITH ANGULAR bit.ly/2Q9MJqs