Event loop in browser

Oct 3, 2018Download as PPTX, PDF1 like252 views

In this presentation, Anupam Poria of Valuebound has talked about “Event loop in the browser.” ---------------------------------------------------------- Get Socialistic Our website: http://valuebound.com/ LinkedIn: http://bit.ly/2eKgdux Facebook: https://www.facebook.com/valuebound/ Twitter: http://bit.ly/2gFPTi8

Event Loop
In Browser
Anupam Poria
https://www.linkedin.com/in/anupam-poria-5b9ab957/
Event Loop

● How HTML is rendered in the browser?
● What is the event loop?
● Why it's important?
● How does it work?
Agenda

Internal structure of the browser
User Interface
Browser Engine
Rendering Engine
Storage
networking JS engine UI backend
User interface: The user interface includes the
address bar, back/forward button, bookmarking
menu, etc. Every part of the browser display
except the window where you see the
requested page.
Browser engine: The browser engine
marshals actions between the UI and the
rendering engine.
Rendering engine: The rendering engine is
responsible for displaying the requested
content.
Data storage: The data storage is a
persistence layer (cookies, localStorage,
IndexedDB, WebSQL, and FileSystem).
UI backend: It'd used for drawing basic
widgets. This backend exposes a generic
interface. Underneath it uses operating system
user interface methods.

Browser Workflow
Byte
Character
Tokens
Nodes
Dom
3c626f64793e3c6469763e48656c6c6f3c2f6469763e3c2f62
6f64793e
<body><div>Hello</div></body><body><div>Hello</div></body>
StartTag:body StartTag:div Hello EndTag:div EndTag:body
Tokenize
r
Body Hello Div
body
div
Hello
TreeBuilder

Call Stack
function getBar() {
console.log('done')
setTimeout(() => {
console.log('Wao!')
},1000);
}
function getFoo() {
getBar();
}
getFoo();
getFoo()
function getFoo(){
getBar();
}
function getBar() {
console.log('done')
}
done
Call Stack

Call Stack
function getBar() {
console.log('done')
setTimeout(() => {
console.log('Wao!')
},1000);
}
function getFoo() {
getBar();
}
getFoo();
Done
Wao!

Heap
Event Loop
setTimeout
new Promise
AJAX
etc..
resolve()
reject()
callback()
callback()
callback()
60 frame/s
One
callback()
Full job
queue()
May be re
render ……...
callstack
V8 runtime
code
code
code Web APIs
Job queue Event queue
Render queue
Main Thread

Event loop pseudo code
while (true) {
queue = getNextQueue();
task = queue.pop();
process(task);
while (microTasksQueue.hasTasks()) {
processMicroTask();
}
if (isRepaintTime()) {
doPaint();
}
}

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Event loop in browser

1. Event Loop In Browser Anupam Poria https://www.linkedin.com/in/anupam-poria-5b9ab957/ Event Loop

2. ● How HTML is rendered in the browser? ● What is the event loop? ● Why it's important? ● How does it work? Agenda

3. Internal structure of the browser User Interface Browser Engine Rendering Engine Storage networking JS engine UI backend User interface: The user interface includes the address bar, back/forward button, bookmarking menu, etc. Every part of the browser display except the window where you see the requested page. Browser engine: The browser engine marshals actions between the UI and the rendering engine. Rendering engine: The rendering engine is responsible for displaying the requested content. Data storage: The data storage is a persistence layer (cookies, localStorage, IndexedDB, WebSQL, and FileSystem). UI backend: It'd used for drawing basic widgets. This backend exposes a generic interface. Underneath it uses operating system user interface methods.

4. Browser Workflow Byte Character Tokens Nodes Dom 3c626f64793e3c6469763e48656c6c6f3c2f6469763e3c2f62 6f64793e <body><div>Hello</div></body><body><div>Hello</div></body> StartTag:body StartTag:div Hello EndTag:div EndTag:body Tokenize r Body Hello Div body div Hello TreeBuilder

5. Call Stack function getBar() { console.log('done') setTimeout(() => { console.log('Wao!') },1000); } function getFoo() { getBar(); } getFoo(); getFoo() function getFoo(){ getBar(); } function getBar() { console.log('done') } done Call Stack

7. Call Stack function getBar() { console.log('done') setTimeout(() => { console.log('Wao!') },1000); } function getFoo() { getBar(); } getFoo(); Done Wao!

8. Heap Event Loop setTimeout new Promise AJAX etc.. resolve() reject() callback() callback() callback() 60 frame/s One callback() Full job queue() May be re render ……... callstack V8 runtime code code code Web APIs Job queue Event queue Render queue Main Thread

9. Event loop pseudo code while (true) { queue = getNextQueue(); task = queue.pop(); process(task); while (microTasksQueue.hasTasks()) { processMicroTask(); } if (isRepaintTime()) { doPaint(); } }

10. Thank You

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