Static methods in JavaScript is a way for providing class level methods. To declare a static method, we have to use static keyword as prefix with method name. Syntax: class className(){ static methodName(){ //method body } } Ways to call static methods 1. Using Class name ClassName.methodName(); 2. On the constructor property of the class … Read more
To initialize and create an object in Javascript, a constructor method is used which is called when memory is allocated for an object. A class in Javascript can contain one constructor method only, however, a parent class constructor can be used by using the super keyword. Example: <!DOCTYPE html> <html> <body> <script> class Student { … Read more
The dictionary meaning of Prototype: A first or preliminary version of a device or vehicle from which other forms are developed. A prototype-based language is one that facilitates the objects to obtain properties and features from one another. In JavaScript, each object contains a prototype object, and the prototype property is added to each function … Read more
Anything that has a state and behavior can be termed an Object, be it physical or logical. An Object is an entity mentioned in the OOPs concept and is frequently found in JavaScript codes. Creating an object in JavaScript is a direct phenomenon as JavaScript is a template-based language and is not based on classes. … Read more
According to Wikipedia: In object-oriented programming, a class is an extensible program-code-template for creating objects, providing initial values for state (member variables) and implementations of behavior (member functions or methods). A class in Javascript is a special type of function that contains various class members including methods or constructors. A class in JavaScript can be … Read more
JavaScript email validation: An email is tricky because of its format. Some of the basic checks are as follows: Presence of @ and . character Presence of at least one character before and after the @. Presence of at least two characters after. (dot). Example <!DOCTYPE html> <html lang=”en”> <head> <script> function validateEmail(emailId) { var … Read more
Form validation is the way of ensuring that form data entered by the user meets the specified criteria. Let us take the example of a registration form which needs a name, email ID, etc. We want that name not to contain any special characters and the email address should be a valid one like with … Read more
The JavaScript innerText property is used to generate the dynamic text on the HTML document and is used to get the text content of the specified node, and all its descendants. The dynamic text can be a validation message, password strength, etc. Syntax 1: To get the text content of a node node.innerText Syntax 2: … Read more
The JavaScript innerHTML property is used to generate the dynamic HTML and is the easiest way to modify the content of an HTML element. The dynamic HTML can be a registration form, comment form, links, etc. Syntax 1: To change the content of an HTML element document.getElementById(id).innerHTML = new HTML Syntax 2: To get the … Read more
getElementsByTagName The document.getElementsByTagName(name) is a method of the document object that is used to get an element by its tag name. Syntax: document.getElementsByTagName(name) Example: <!DOCTYPE html> <html> <body> <h1>”Get Element by Tag Name!”</h1> <p>Example</p> <p id=”DOM”></p> <script> var x = document.getElementsByTagName(“h1”); document.getElementById(“DOM”).innerHTML = ‘The text in h1 is: ‘ + x[0].innerHTML; </script> </body> </html>