[PDF] Fetch PDF JS5.pdf

AJAX • Asynchronous JavaScript + XML • Not tied to XML despite the name • Allows for CORS defines how browsers and servers can work together to share

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[PDF] AJAX, fetch, and Axios

What is AJAX? • “Asynchronous JavaScript And XML” • Making background HTTP requests using JavaScript • Handling the response of those HTTP requests

[PDF] Online Multimedia - LMU München - Medieninformatik

Asynchronous JavaScript + XML (Ajax is meant as “shorthand” and not as acronym XHR vs fetch The fetch-API simplifies AJAX and provides a modern

[PDF] Chapter 9 Scraping Sites That Use JavaScript and AJAX - Oxford

That being the case, we can use the ID to fetch the details for each establishment, in a script Let's look at the response that comes back, which is again, JSON [{"

[PDF] Ajax Performance Tuning and Best Practice - Oracle

Inline JavaScript and CSS in front page, but dynamically Semi-Asynchronous – Like an Ajax request Includes HttpClient that can fetch content from external

[PDF] Fetch

AJAX • Asynchronous JavaScript + XML • Not tied to XML despite the name • Allows for CORS defines how browsers and servers can work together to share

[PDF] 06HTTP & AJAX - Bienvenue sur HE-Arc

18 nov 2020 · ¹³https://code tutsplus com/tutorials/jquery-succinctly-jquery-and-ajax--net-33856 L'API Fetch est native et plus simple d'utilisation que jQuery

[PDF] fetch() - Python Basics

11 avr 2020 · Web API — Fetch API Server provides the first HTML page, with JS and other resources Some small differences with JQuery ajax() – E g

data interchange format: XML or JSON (JavaScript Object Nota6on) PHP: it communicates with FLASH /AJAX widgets and with the database Let's say you have an image gallery and want to fetch a bunch of images then save them locally

[PDF] Web 20 Introduction à Ajax - Les pages perso du LIG

9 mar 2021 · Exemple librement inspiré de : AJAX Basics and Development Tools de Sang Shin "Fetch makes it easier to make web requests and handle

[PDF] AJAX :: jQuery part 1 - Mediamaps

“jQuery is a fast and concise JavaScript Library that simplifies HTML document traversing, event handling, animating, and AJAX interactions for rapid web

JSON•JavaScript Object Notation•Based on JavaScript syntax but not tied to JavaScript•Can be used in all sorts of languages•Data format for structured data•No functions, etc.•More compact than XML

JSON (continued)•ECMAScript5 formalizes JSON parsing natively via the JSON type•JSON.stringify•JSON.parse•See JSONexample

AJAX•Asynchronous JavaScript + XML•Not tied to XML despite the name•Allows for asynchronous sending and receiving of data between browser and web server without a page "refresh"•Accomplished via the XMLHttpRequestobject•https://xhr.spec.whatwg.org/

CORS•Cross-Origin Resource Sharing•http://www.w3.org/TR/cors/•https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS•Historically XHR objects have had limitations on being able to only access resources on the same domain as the originating web page•There are legitimate use cases for cross-origin XHR requests•My AJAX example code for example•CORS defines how browsers and servers can work together to share resources across domains

CORS (continued)•Accomplished via HTTP headers and some restrictions on what browsers and servers can do•Some important headers•Access-Control-Allow-Origin•Origin•See AJAXexamples

Promises•A promise represents an operation that is expected to be completed in the future•Alternative to callbacks for asynchronous code•Helps avoid "callback hell"•https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise•https://leanpub.com/understandinges6/read#leanpub-auto-promises•http://exploringjs.com/es6/ch_promises.html•See Promises example

Fetch API•Similar to XMLHttpRequest(AJAX)•Cleaner API •Uses Promises •https://developers.google.com/web/updates/2015/03/introduction-to-fetch•https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API•See Fetch example

Server-Sent Events (SSE)•Creates an HTTP connection by which the server can repeatedly send information to the browser•Eliminates need for browser to poll the server•Read only (only server can push data)•No IE support or Edge support•Specification and tutorial:•http://www.w3.org/TR/eventsource/•https://developer.mozilla.org/en-US/docs/Server-sent_events/Using_server-sent_events

Web Sockets•Provides full-duplex, bidirectional communication between browser and web server•Not HTTP•API Specification:•https://html.spec.whatwg.org/multipage/comms.html#network•Protocol:•http://tools.ietf.org/html/rfc6455•Tutorials:•https://developer.mozilla.org/en-US/docs/WebSockets

SSE Versus Web Sockets•Server-Sent Events•Uses HTTP•Read-only•Web Sockets•Not HTTP so requires server configuration and supporting software•Bidirectional

SSE and Web Sockets Examples•Server-Sent Events•http://54.175.170.45/ServerSentEvents.html•Uses PHP on backend•Web Sockets•http://54.175.170.45/WebSockets.html•Uses PHP on backend•Uses Ratchet PHP WebSocketlibrary•Tutorial for Java EE:•http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/HomeWebsocket/WebsocketHome.html

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