Front End Technology Articles - Page 597 of 652

This tutorial will teach us how to format a number with two decimals using JavaScript. Formatting a number means rounding the number up to a specified decimal place. In JavaScript, we can apply many methods to perform the formatting. Some of them are listed as follows − The toFixed() Method Math.round() Method Math.floor() Method Math.ceil() Method The toFixed() Method The toFixed() method formats a number with a specific number of digits to the right of the decimal. it returns a string representation of the number that does not use exponential notation and has the exact number of digits after ... Read More

In this tutorial, we will learn how to perform integer division and get the remainder in JavaScript. The division operator (/) returns the quotient of its operands, where the dividend is on the left, and the divisor is on the right. When another splits one operand, the remainder operator (%) returns the residual. It always takes the dividend sign. In the operation x% y, x is known as the dividend, and y is known as the divisor. If one of the operands is NaN, x is Infinity, or y is 0, the operation returns NaN. Otherwise, the dividend x is ... Read More

The following are the details of the maximum size of web browser’s cookies value −Web BrowserMaximum cookiesMaximum size per cookieGoogle Chrome1804096 bytesFirefox1504097 bytesOpera1804096 bytesAndroid504096 bytes

To get dates in JavaScript, use the getTime() method. Forgetting the difference between two dates, calculate the difference between date and time.ExampleYou can try to run the following code to learn how to calculate a difference between two dates −Live Demo                    var dateFirst = new Date("11/25/2017");          var dateSecond = new Date("11/28/2017");          // time difference          var timeDiff = Math.abs(dateSecond.getTime() - dateFirst.getTime());          // days difference          var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));          // difference          alert(diffDays);          

Here’s the best way to read cookies by name in JavaScript. The following is the function −function ReadCookie() {    var allcookies = document.cookie;    document.write ("All Cookies : " + allcookies );    // Get all the cookies pairs in an array    cookiearray = allcookies.split(';');    // Now take key value pair out of this array    for(var i = 0; i < cookiearray.length; i++) {       name = cookiearray[i].split('=')[0];       value = cookiearray[i].split('=')[1];       document.write ("Key is : " + name + " and Value is : " + value);    } }

Tables in HTML can have horizontal header and vertical header. For the horizontal header, we need to set all inside a single  tag. Syntax Following is the syntax to set horizontal header for a table − horizontal header1… horizontal header2… Example 1 Now let us see an example program to set horizontal header for a table. DOCTYPE html> table, tr, th, ... Read More

To get an integer in the string “abcde 30”, use the following regex in JavaScript, else it will return NaN. With that, use parseInt() to get the numbers with regex under String match() method −ExampleLive Demo                    var myStr = "abcdef 30";          var num = parseInt(myStr.match(/\d+/))          alert(num);          

Use the toString() method to get the string representation of a number. You can try to run the following code to print a string representation of numbers like 20, -40, 15.5 −ExampleLive Demo                    var num1 = 25;          document.write(num1.toString()+"");          document.write((30.2).toString()+"");          var num2 = 3;          document.write(num2.toString(2)+"");          document.write((-0xff).toString(2));           Output25 30.2 11 -11111111Above, you can see we added a parameter to the toString() method. This is an optional parameter, which allows you to add an integer between 2 and 36, which is the base for representing numeric values.

To merge table columns in HTML use the colspan attribute in tag. With this, merge cells with each other. For example, if your table is having 4 rows and 4 columns, then with colspan attribute, you can easily merge 2 or even 3 of the table cells.ExampleYou can try to run the following code to merge table column in HTML. Firstly, we will see how to create a table in HTML with 3 rows and 3 columns                    table, th, td {             border: ... Read More

To create a session only cookie, you need to set the expiration date of the cookie to be some years ahead. You need to set the expire attribute −current time + 5 yearsThe expire attribute shows the date the cookie will expire. If this is blank, the cookie will expire when the visitor quits the browser.Note − Do not consider removing the expire value to create a session only cookie. This won’t work. Set the expire attribute to the future date.