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Classes and Objects in JavaScript

February 19, 2021January 26, 2019 by manish

A class is a set or category of things having some property or attribute in common i.e., car is a class having similar properties such as color, engine, gear, model number etc. The “class” construct allows us to define prototype-based classes. Syntax for declaring a class:

class User {
  constructor(name) {
    this.name = name;
  }
  display() {
    alert(this.name);
  }
}
let user = new User("Sherlock");
user.display();

class User {

constructor(name) {

this.name = name;

}

display() {

alert(this.name);

}

let user = new User("Sherlock");

user.display();

Objects Objects are the instance of classes i.e., … Read more

PHP Abstract Class

November 8, 2019October 10, 2018 by manish

Abstract keyword is another new functionality in OOPS. When a class declare by Abstract keyword this class cannot be instantiate. Means if user declares a class as an Abstract class he or she cannot create object of that class. Abstract class is only use for inheriting another class. Main purpose of creating abstract class is … Read more

PHP Final Class

November 8, 2019October 10, 2018 by manish

In PHP 5 a new mechanism added in OOPS which is Final Keyword. If a class declares by final keyword then the class never extended. Child class can’t be created of any Final class. It is restrict the overriding a method. Only class and function may be declared as Final but no variable or properties … Read more

PHP Class and Objects

November 8, 2019October 9, 2018 by manish

Class and objects is a programming template to write a program in a block. It is helps to developer write complex program in simple way, reuse a program in multiple applications and create a structural program. A class has two member one Variables and two Functions. A class is a program structure where developer defines … Read more

Java Classes and Objects

November 8, 2019August 23, 2018 by manish

Class A class forms the basis for object-oriented programming. It defines the shape and nature of the object. Any concept that we want to implement in oop’s must be encapsulated within a class. A class is a template for an object and an object is an instance for a class. In another words class is … Read more

Getting id and class value of a html element

November 8, 2019December 27, 2014 by manish

We have a div and we want to get its id value based on its class value. Suppose a div is given as below and we want to fetch div id based on a button click. for getting attribute id we use attr() method. Example

<div class="select" id="select_25">
This is a ball
</div>
<input type="submit" value="Get Id" id="submit">

This is a ball

</div>

$(document).ready(function () {
    $(document).on('click', '#submit', function (event) {
        event.preventDefault();
         alert("id is "+$(".select").attr('id'));
         alert("class is "+$("#select_25").attr('class'));
    });
});

$(document).ready(function () {

$(document).on('click', '#submit', function (event) {

event.preventDefault();

alert("id is "+$(".select").attr('id'));

alert("class is "+$("#select_25").attr('class'));

});

Output