1.

What is the use of JavaScript eval function?

Answer»

Cookies has a plain text record of fields: Expires, Domain, Path, SECURE, etc. They are generally used to track preferences, commissions, etc. It is STORE information on your COMPUTER in the form of plain text. Cookies are saved in name-value pairs. It gets deleted when the web browser is closed.

LET us see how we can create a cookie in JavaScript:

The document.cookie property is used in JavaScript to create cookies. With the same property, you can also read and delete cookies.

Create a cookie:

document.cookie = "username=Knowledge Hut";

Add an expiry date to the cookie create above: 

document.cookie = "username= Knowledge Hut; expires=Thu, 12 Dec 2018 12:00:00 UTC";

To read a cookie in JavaScript:

var a = document.cookie;

The above displays the cookies in name-value form i.e.: 

cookie1=value; cookie2=value;

To delete a cookie, you need to just set the cookie to the past date. The date is included using the expires parameter:

document.cookie = "username=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;";

Let us see an example that creates and set a cookie: 

<html>    <head>       <script>          <!--             function displayCookie()             {                if( document.one.dept.value == "" ){                   alert("Enter some value!");                   return;                }                val = escape(document.one.dept.value) + ";";                document.cookie="name=" + val;                document.write ("Setting Cookie <br> " + "name=" + val );             }          //-->       </script>    </head>    <body>       <form name="one" action="">          Enter Department: <input type="text" name="dept"/>          <input type="button" value="Input Cookie" onclick="displayCookie();"/>       </form>    </body> </html>

The output displays an input, wherein we add a value to set as cookie: 

On clicking “Input Cookie” above, you can see that we have set the cookie successfully:


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