The JavaScript math asin() method is used to get the arcsine of a number in radians. It returns NaN if the number is not in the range of -1 to 1. Syntax: Math.asin(n) Parameters n: It represents the number whose arcsine has to be get. Returns Arcsine of a number Example: <!DOCTYPE html> <html> <body> … Read more
The JavaScript math acos() method is used to get the arccosine of a number in radians. Syntax: Math.acos(n) Parameters n: It represents the number whose arccosine has to be get. Returns Arccosine of a number. Example: <!DOCTYPE html> <html> <body> <script> document.writeln(Math.acos(1)); </script> </body> </html>
The JavaScript math abs() method is used to get the absolute value of a number. Syntax: Math.abs(n) Parameters n: It represents the number whose absolute value has to be obtained. Returns The absolute value of a number Example: <!DOCTYPE html> <html> <body> <script> document.writeln(Math.abs(-345)); </script> </body> </html>
We can add a method to a JavaScript object. First, define a method and then assign that method as a property to an object. Example: <html> <body> <script> function stuClassName(className){ this.className=className; } function Student(name,rollNo){ this.name=name; this.rollNo=rollNo; this.stuClassName= stuClassName; } var student=new Student(“Jai”, “MCA/07/06”); student.stuClassName(“MCA Final”); document.write(“Name: ” +student.name + “</br>”); document.write(“RollNo: ” + student.rollNo + … Read more
In every language, evaluation of an expression is done based on a predefined order of precedence which helps the language engine to determine which part of the expression will be evaluated first, which will second, and so on. Operator precedence in JavaScript Operator Operation Order of Precedence Order of Evaluation ++ Increment 1 R -> L … Read more
IP address validation in JavaScript is used to ensure that the number entered in the specified IP address field should be a valid IP address. Regular Expression: /^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?) \.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/ Example: <!DOCTYPE html> <html lang=”en”> <head> <script> function ipAddressCheck(ipAddress) { var regEx = /^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?) \.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/; if(ipAddress.value.match(regEx)) { return true; } else { alert(“Please enter a valid … Read more
Credit card validation in JavaScript is used to make sure that all the numbers entered in the specified credit card number field should be a valid card number. As we know there are a lot of companies that provide credit cards and all these have different formats of credit card numbers. So we have to … Read more
Phone number validation in JavaScript is used to make sure that all the numbers entered in the specified phone number field should be a valid phone number Regular Expression: /^\+(?:[0-9] ?){6,14}[0-9]$/ Example: <!DOCTYPE html> <html lang=”en”> <head> <script> function phoneNumberCheck(phoneNumber) { var regEx = ^\+{0,2}([\-\. ])?()?([\-\. ])??([\-\. ])?\d{3}([\-\. ])?\d{4}; if(phoneNumber.value.match(regEx)) { return true; } else … Read more
String length validation in JavaScript is used to make sure that the number of characters entered in a specified field will be restricted. For example, the name field should have a length of 8-10 characters only. Example: <!DOCTYPE html> <html lang=”en”> <head> <script> function stringLengthCheck(name, minlength, maxlength) { var mnlen = minlength; var mxlen = … Read more
Alphanumeric validation in JavaScript is used to make sure that all the characters entered in the specified field must be any alphabet (A-Z or a-z) or any number (0-9). Regular Expression: /^[0-9a-zA-Z]+$/ Example: <!DOCTYPE html> <html lang=”en”> <head> <script> function lettersNumbersCheck(name) { var regEx = /^[0-9a-zA-Z]+$/; if(name.value.match(regEx)) { return true; } else { alert(“Please enter … Read more