![]() Then you will learn to build a server that serves static HTML pages from the app directory. After that, you will learn how to install and configure MongoDB on to a Windows machine. In this course, you will first learn to install Git Bash and Node.js on to a Windows 7 machine. ‘Lorem’ inside of Lorem is text node .Įlement and Text nodes are two separate nodes in the DOM.This course in NodeJS is designed in such a way that you can understand the fundamentals of NodeJS. Text Node – The text inside of the tags is the text node e.g.Element Node – For Example the entire tags (including text inside of it) are the element nodes e.g Lorem.Įverything we can change in the document are nodes. acting as an interface connecting the page to the outside world, like JavaScriptĪ document, consists of a hierarchical tree of nodes.Ī node is a fundamental record representing a single object within the document. represent the HTML document in form of Objects. As soon as the first chunks of code come in, it starts parsing the HTML, adding nodes to the tree structure. The browser builds up the DOM bit by bit.Each HTML tag is represented by a node of the tree called a DOM node.The browser engines use HTML parser to convert HTML into DOM, which is a tree like representation of the HTML tags, in form of objects.There are two types of parser : HTML parser and CSS parser.In order to convert the data from one format to another, browsers engines have a special piece of code called parser.To make any sense of the HTML, browsers first have to convert it into a format they understand.For browser the HTML is only a piece of text. ![]() HTML describes the structure of a web page.DOM is used to interact with web pages, to add, delete or change the structure, style or content of the document.DOM connects web pages to scripts or programming languages by representing the structure of a document like HTML representing a web page-in memory.Model – describes how these Objects are represented in a tree fashion.Document – is document in form of HTML file or web page when displayed.The Document Object Model ( DOM) is an API that represents a document with a logical tree.ĭOM is the API or layer between the source code and what we see in the browser itself. Audio and Video APIs like HTMLMediaElement and WebRTC allow you to do really interesting things with multimedia, such as play audio and video right in a web page, or grab video from your web camera and display it on someone else’s computer.The Canvas and WebGL APIs allow you to create animated 2D and 3D graphics.This is how Google Maps is able to find your location and plot it on a map. The Geolocation API retrieves geographical information.The DOM (Document Object Model) API allows you to manipulate HTML and CSS, creating, removing and changing HTML, dynamically applying new styles to your page, etc.The Google Maps API and OpenStreetMap API allows you to embed custom maps into your website, and other such functionality.īrowser APIs are built into your web browser, and are able to expose data from the surrounding computer environment, or do useful complex things.The Twitter API allows you to do things like displaying your latest tweets on your website.Third party APIs are not built into the browser by default, and you generally have to grab their code and information from somewhere on the Web. In simple words, API is a messenger that takes your request to the system and tells it what to do and the delivers what you requested for. They do the same thing for programming that ready-made furniture kits do for home building - it is much easier to take ready-cut panels and screw them together to make a bookshelf than it is to work out the design yourself The functionality built on top of the client-side JavaScript language, called Application Programming Interfaces ( APIs) provide you with extra superpowers to use in your JavaScript code.ĪPIs are ready-made sets of code building blocks that allow a developer to implement programs that would otherwise be hard or impossible to implement.
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