The owner of all other objects in your web page is HTML DOM document object. It represents web pages. If you want to access html element you have start accessing with document object. Finding HTML Elements Method Description document.getElementById(id) Find an element by element id document.getElementsByTagName(name) Find elements by tag name document.getElementsByClassName(name) Find elements by…


HTML DOM is used to access the elements of html document and make change them. DOM stands for Data Object Model. When a web page is loaded, the browser creates a DOM of the page. JavaScript can change all the HTML elements and css attributes in the page. DOM is a W3 Standard. It defines…


In JavaScript we defined a function using function keyword. Declaration of Function The following syntax will define the functions declaration : Example : OUTPUT : This example calls a function which performs a calculation, and returns the result:


Constraint Validation DOM Methods There are two methods : 1. checkValidity() 2. setCustomValidity() OUTPUT : Enter a number and click OK: OK If the number is less than 200 or greater than 400, an error message will be displayed.


JSON Stands for JavaScript Object Notation. JSON is a format for storing and transporting data means it is a data-interchange fornat. JSON is language independent. Exmaple : This JSON syntax defines a student object: an array of 3 student records (objects): Syntax Rules : Data is in name/value pairs Data is separated(,) by commas Curly…