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About Me

Hello, I am Amritanjali and I welcome you to my blog UI Source where I write about UI related technologies like Angular, TypeScript, JavaScript, HTML, CSS.

I love to create my own thoughts about anything which comes to my notice and I think we should always have our own thinking on everything rather than just following what others think.

That’s why I have started writing this blog to keep all my notes and thoughts on UI related technologies in one place and make them available to others.

Thanks for visiting UI Source and I hope you enjoyed the posts. Any kind of feedback is always welcomed and appreciated. You can submit any query or suggestion in the Contact Us box.

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DOM(Document Object Model) and BOM(Browser Object Model)

DOM(Document Object Model) The DOM is the Document Object Model, which deals with the document, the HTML elements themselves, It organize the elements of the document in tree structure (DOM tree) and in the DOM tree, all elements of the document are defined as objects (tree nodes) which have properties and methods.When a web page is loaded, the browser creates a DOM tree for all the objects (Html elements) of that page. e.g. document and all traversal you would do in it, events, etc. A Simple DOM Tree BOM(Browser Object Model) The BOM is the Browser Object Model, which deals with browser components aside from the document,like history, location, navigator and screen (as well as some others that vary by browser). The Browser Object Model (BOM) in JavaScript includes the properties and methods for JavaScript to interact with the web browser. BOM provides you with window object, for example, to show the width and height of the window. It also includes the window.scre
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JavaScript type hoisting with variable function Expression

JavaScript type hoisting with variable function Expression Hoisting is JavaScript default behavior to moving declaration on the top. Variable can be used before its declaration. To understand this, first we need to understand of hoist meaning, hoist means “raise(something) by means of ropes & pulleys”. now we can relate hoisting with JavaScript. JavaScript interpreter moves all declaration on the top at runtime. It is best practice to declare all variable at the top of their respective scopes. , JavaScript is loosely syntax language so it will not throw any error at runtime if the variable used before its declaration. But JavaScript does not allow variable used before its declaration in “use strict” mode. Example 1 In this example, we can see in a normal scenario, when y has declared & then used. in this case, it will give output 10 as excepted. <p id= "demo" ></p> <script> var y; //Declare y y = 10 ;
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Life cycle hook

In Angular, every component has a life-cycle, a number of different stages it goes through. Creates the component Renders the component Creates and renders the component children Checks when the component data-bound properties change, and  Destroys the component before removing it from the DOM ngOnChanges this method is called  once  on component’s creation and then  every time changes  are detected in one of the component’s  input  properties. export class MyComponent implements OnChanges { ngOnChanges(changes: SimpleChanges) { // Insert Logic Here! } }   ngOnInit Invoked when given component has been initialized. This hook is only called  once  after the first  ngOnChanges export class MyComponent implements OnInit { ngOnInit() { // Insert Logic Here! } }     ngDoCheck Invoked when the change detector of the given component is invoked. It allows us to implement our own change detection algorithm for the given component. export class MyComponent implements D
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