Day 8: Create a Button | JavaScript HackerRank Solution
#day8createabuttonhackerrankjavascript #create a button hackerrank solution
document:
The HTML DOM document object is the owner of all other objects in your web page.
The document object represents your web page.
If you want to access any element in an HTML page, you always start with accessing the document object.
addEventListener: The document.addEventListener method attaches an event handler to the document.
The DOMContentLoaded event fires when the DOM content is loaded, without waiting for images and stylesheets to finish loading.
Only handle DOMContentLoaded event if you place the JavaScript code in the head, which references elements in the body section.
The lifecycle of an HTML page has three important events:
DOMContentLoaded – the browser fully loaded HTML, and the DOM tree is built, but external resources like pictures img and stylesheets may not yet have loaded.
load – not only HTML is loaded, but also all the external resources: images, styles etc.
beforeunload /unload – the user is leaving the page.
Each event may be useful:
DOMContentLoaded event – DOM is ready, so the handler can lookup DOM nodes, initialize the interface.
load event – external resources are loaded, so styles are applied, image sizes are known etc.
beforeunload event – the user is leaving: we can check if the user saved the changes and ask them whether they really want to leave.
unload – the user almost left, but we still can initiate some operations, such as sending out statistics.
=The document.getElementById() method returns the element of specified id.
=e is the short var reference for event object which will be passed to event handlers.
=Event.currentTarget: The currentTarget read-only property of the Event interface identifies the current target for the event, as the event traverses the DOM. It always refers to the element to which the event handler has been attached, as opposed to Event.target, which identifies the element on which the event occurred and which may be its descendant.
=The innerText property can be used to write the dynamic text on the html document. Here, text will not be interpreted as html text but a normal text.
It is used mostly in the web pages to generate the dynamic content such as writing the validation message, password strength etc.
=The Number constructor contains constants and methods for working with numbers. Values of other types can be converted to numbers using the Number() function.
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