To call a parent window function, use “window.top”.ExampleYou can try to run the following code to call a parent window function from an iframeLive Demo                    function display(){             alert("Hello World!");          }                      Click          

In this tutorial, let us discuss the methods to use unlimited arguments in a JavaScript function. The number of arguments in a JavaScript function is a bit tricky. If we specify three arguments should follow the correct order of the arguments. Let us discover the solution to this problem by introducing the methods to pass unlimited in a function, we can not pass more than three. Moreover, we arguments to a JavaScript function. Using ES5 Arguments Object Instead of converting the arguments object to an array, we can process the arguments object with the total number of arguments. Follow the ... Read More

This tutorial will teach us how to declare optional function parameters in JavaScript. While declaring the function, we pass some variables to the function definition to use it inside the function block, called function parameters. The function parameters can also be optional, which gives us the independence to pass function arguments when we call the function. Here, Arguments are the values we pass while calling the function, and parameters are the variables we pass in the function definition.Optional ParametersThe optional parameter word means that you don’t need to pass that parameter every time you call the function, giving you the ... Read More

In this article, we will learn about the Multiplication assignment operator (*=) in JavaScript. In general, we use a = a * b this expression to update the value of a variable with the value returned after multiplying its original value with some other value, which is easy to understand, but it time taking to write again and again if we are using updating values of more variables like this. So, to overcome this problem, JavaScript introduces us to the multiplication assignment operator (*=) as it is the short form for using the above expression. The multiplication Assignment operator (*=) ... Read More

In this tutorial, we are going to learn how can we delay a function in JavaScript. Whenever we want to call a function after a specified amount of time than we use the delay function in JavaScript. To provide delay in JavaScript function we use a global window object named as setTimeout(). This function allows us to provide a specific delay before executing a function. Let’s deep down into some of the functionalities, syntax and many other things of setTimeout() function. The setTimeout() method mainly require two one is the function which we need to execute with some delay and ... Read More

We use Object and Map classes to mimic the behavior of associative array/hashing in JavaScript. JavaScript doesn’t provide an associative array built-in. The closest similar behavior we get is from the Map class in JavaScript. Let us look at them one by one. Object class in JavaScript The object class allows us to create objects with name-value pairs. This is similar to hashing as the object knows which property is associated with what value. Syntax const obj = { name : "Abhishek", age : 22 } var name = obj.name This creates an ... Read More

As we know, a URL is a web address. What is URL encodingand why do we need to encode a URL? The process of turning a string into an accurateURL format is known as URL encoding. A valid URL format only uses "alpha | digit | safe | extra | escape" characters. Only a limited selection of the normal 128 ASCII characters is permitted in URLs. It is required to encrypt reserved characters that are not part of this set. The reliability and security of the URLs are increased with URL encoding. Each character that needs to be URL-encoded is ... Read More

The increment (++) and decrement (---) operators should be avoided since it can lead to unexpected results. Here are some of the conditions −ExampleIn an assignment statement, it can lead to unfavorable results −Live Demo                                        var a = 5;                    var b = ++a;                    var c = a++;                    var d = ++c;                        document.write(a);                    document.write("\r"+b);                    document.write("\r"+c);                    document.write("\r"+d);                           OutputWhitespace between the operator and variable can also lead to unexpected results −a = b = c = 1; ++a ; b -- ; c;

In this tutorial, we will learn how to decode a URL using JavaScript. URL is an abbreviation for Uniform Resource Locator. A URL is the address of a certain Web site. Each valid URL, in principle, links to a different resource. These resources include an HTML page, a CSS document, a picture, etc. There are several exceptions in practice, the most frequent being a URL linking to a resource that no longer exists or has migrated. Because the Web server handles both the resource represented by the URL and the URL itself, it is up to the web server's owner ... Read More

The parseInt() method in JavaScript converts a string into a number. The method returns NaN if the value entered cannot be converted to a number.ExampleYou can try to run the following code to convert a string into an integer − Live Demo           Check                      function display() {             var val1 = parseInt("50") + "";             var val2 = parseInt("52.40") + "";             var val3 = parseInt(" 75 ") + "";             var res = val1 + val2 + val3;             document.getElementById("demo").innerHTML = res;          }