Routing

Want to add

Few weeks ago (12.03.19) we celebrated 30th birthday of WWW
Thank you Google for reminding me

What are you going to tell us?

My performance

  • URL
  • HTTP
  • REST vs GraphQL
  • Routing in the past
  • Routing nowadays

What we are waiting for? Let's do it

URL

Routing

URL 

UI

What is Router?

URL

Action

Title Text

URL

Example 

Wikipedia

URL's functions

  • For instance:

  • every view on the screen should have its own specific URL so I can bookmark the page.
  • The forward and back button should move me forward or backward in my browsing history.
  • Nested views(navigation) and those with parameters should be supported, such as example.com/products/shoes/101.

What is that

HTTP?

HyperText Transfer Protocol

The task that is traditionally solved using the HTTP protocol is data exchange between a user application accessing web resources (usually a web browser) and a web server.

HTTP Request Methods

​ There are lots of them but they are less useable...

​

The different operations that can be done with HTTP:

Example 

Authentification

Quick lookthrought

Another example

making order

Next step about
Static codes

HTTP defines several status codes, each pertaining to a specific scenario. 

2xx: the request completed successfully and without errors. 

3xx: implies redirection. 

4xx: are used when there is an error in the request made. 

5xx: Lastly, a 5xx response is used when there is an error on the server side.

Headers

Headers are an essential part of HTTP communication. They serve to provide additional information for handling requests and responses.

At last 

How to request?

Rest vs GraphQl 

REST

short for REpresentational State Transfer, is an architectural style that aims to leverage all the same constructs that have allowed to the Web to grow over the last couple of decades. It uses these as guiding principles for designing web services.

GraphQL

This is a syntax that describes how to request data and is basically used by the client to download data from the server.

Meaning

REST

The key to the REST concept is the resource. 

Each resource is identified by its URL, and in order to obtain the resource, it is necessary to send a GET request to this URL.

Most likely, the answer will come in the JSON format, since this particular format is now used in most APIs.

GraphQL

GraphQL has three main features:

  • Allows the customer to specify exactly what data he needs.
  • Easily aggregates data from multiple sources.
  • Uses a type system to describe the data

Concept

REST

GraphQL

REQUEST in ...

GET /books/1
{
  "title": "Types & Grammar",
  "author": { 
    "firstName": "Kyle",
    "lastName": "Simpson"
  }
  // ... other field
}
GET 
/graphql?query={
     book(id: "1") { 
     title, author { firstName } 
         } 
    }

{
  "title": "Types & Grammar",
  "author": {
    "firstName": "Kyle",
  }
}

Rest api

GraphQL

Visualisation

Far far away

In the browser, the location (URL information) and session history (a stack of locations visited by the current browser tab) are stored in the global window object. They are accessible via:

What history api 

can do?

Title Text

  • pushState(href) — pushes a new location onto the history stack
  • replaceState(href) — overwrites the current location on the stack
  • back() — navigates to the previous location on the stack
  • forward() — navigates to the next location on the stack
  • go(index) — navigates to a location on the stack, in either direction.

Together, the History and Location APIs enable the modern client-side routing paradigm known as pushState routing — the first protagonist of our story. 






window.onpopstate = (event) => {
  alert("location: " + document.location + ", state: " 
    + JSON.stringify(event.state));
};
history.pushState({page: 1}, "title 1", "?page=1");
history.pushState({page: 2}, "title 2", "?page=2");
history.replaceState({page: 3}, "title 3", "?page=3");
history.back(); 
// "location: http://example.com/example.html?page=1, state: {"page":1}"
history.back(); 
// "location: http://example.com/example.html, state: null
history.go(2);  
// "location: http://example.com/example.html?page=3, state: {"page":3}

What is router nowadays?

Idea of router?

Thank you

for attention

Catch me if you can

medium

twitter

GitHub

What we are going to do next

It's time 

to practise

Our plan

What we need to do

  • Automatically add a hash to a URL.
  • Follow the URL change.
  • Check whether there is a corresponding route for a given URL.
  • Verify and return, if available, parameters passed through the URL.
  • Before initializing the component, make certain checks using the guards (in the case of the latter).
  • Initialize a new component and pass parameters to the constructor from the URL.
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