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 generate a random number, we use the Math.random() function. This method returns a floating-point number in the range 0 (inclusive) to 1 (exclusive). To generate random numbers in different range, we should define the minimum and maximum limits of the range. Please follow the second syntax below for this. To generate random integers, you can follow the third and fourth syntax discussed below. As the Math.random() method gives us a random floating point number so to convert the result into an integer, we need to apply some basic math. Please follow the below syntaxes. Syntax Following is the syntax ... Read More

The standard Unix epoch is an expression in seconds. The Unix epoch or Unix time is the number of seconds elapsed since January 1, 1970.The getTime() method is used to return the millisecond representation of the Date object.To get time in milliseconds, use the following:var milliseconds = (new Date).getTime();

The rowspan and colspan are the attributes of tag. These are used to specify the number of rows or columns a cell should merge. The rowspan attribute is for merging rows and the colspan attribute is for merging columns of the table in HTML. These attributes should be placed inside the tag as shown in the image given below − Syntax Following is the syntax to merge table cells in HTML − cell data cell data Example 1 − Setting the rowspan Now let us look at an example where we set the rowspan of the ... 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.

In JavaScript, the NaN property is a special value that represents "Not a Number". It is a property of the Number object and can be accessed using Number.NaN. The NaN property is usually produced as a result of an operation that cannot produce a meaningful result. For example, dividing 0 by 0 or trying to parse an invalid number will both produce NaN. Here are a few examples of operations that will produce NaN − Math.sqrt(-1); // NaN 0/0; // NaN parseInt("foo"); // NaN It ... Read More

To store large values in JavaScript cookies, try the following possibilities −Create a "session id" and save the settings in a database. Then store the session id in the cookie.Store the indexes of the selected items. Let’s say the selected items are the first 20 items on the list −P[0,19]Create a table to store cookies data such as −[ data_id , data , data_create , date_expire ]Store data_id in a table and when a user visits, get the data_id in cookies.