Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
In this tutorial, we will learn how to check the lock-state of a callback list using jQuery. The lock is a callback list in jQuery in the current state. We can toggle the lock state so that additional changes cannot be made unless required.SyntaxThe callbacks list is locked and checked as follows −// Get callbacks list at current state var callbacks = $.Callbacks() // Lock the callbacks list callbacks.lock() // Check callbacks is locked or not console.log(callbacks.locked())AlgorithmFirst we receive the callbacks list at the current state using the Callbacks() function.Then we lock it using the lock() function and ... Read More
In this tutorial, we will learn How to attach a function to be executed before an Ajax request is sent using jQuery. Ajax requests are typically HTTP requests that are called by the browser for different tasks such as GET, POST, etc. So when the tasks are performed, we can register a handler using the ajaxSend() function of jQuery. This event is called by jQuery whenever an ajax request is to be made.SyntaxUse the following syntax to register a handler before an ajax request −$(document).ajaxSend(function () { console.log('Triggered ajaxStart. Started Request') })We have an Ajax request. Before sending the ... Read More
It is often required to update the string and replace the single character at a particular index while programming with JavaScript. JavaScript doesn’t contain the built-in method to replace the single character at the particular index in the string as the Java and C++, but we can use some other built-in methods and create custom logic to solve our problem.In this tutorial, we have two methods to replace the character at a particular index in the string and update the string. One is by converting string to array, and another is using the substr() built-in method of JavaScript.Replace Character by ... Read More
You may have run into a situation where you clicked a URL to go to a certain page but were directed to a different page internally. Page redirection is the cause of this. Redirecting occurs when an HTTP request for one page immediately navigates to another one. It differs from simply reloading a website. It is quite simple to do a web page redirection using vanilla JavaScript on the client side. So in this article, we will learn how to redirect web pages using vanilla JavaScript and when to use a particular method.There are many ways to accomplish redirection of ... Read More
This tutorial teaches us to get the date and time in JavaScript. Nowadays, JavaScript is the most popular programming language used for user interaction with the browser. We can say that it is hard to find a single web application that does not use JavaScript.The purpose of creating this tutorial is to make programmers familiar with the Date() object. Users can get today’s date and current time using the date class. While developing the applications, programmers maybe need to show the current date and time according to the user’s local zone, and we can fill this requirement using the date ... Read More
This tutorial teaches us to make an array empty in JavaScript. While programming with JavaScript, programmers need to make an array empty in many conditions. For example, coders are doing competitive programming with JavaScript. Suppose, to solve some problem, they need to create a new or an empty array while calling the function every time. Users can visualize this problem from the below example.function child ( ){ // create a new array or use a single array and make it empty every time function invokes } function parent ( ) { for ( int ... Read More
In this tutorial, we will learn to convert a float number to a whole number in JavaScript. The whole number is the number that doesn’t contain the fractional part. For example, 5.22 is the float number containing the fractional part, and the whole number doesn’t contain a decimal part. So, our goal in this tutorial is to remove the fractional part from the number.We can have various methods to cut out the decimal part from the float number to make it whole, and some of them we have discussed here.Using the Math.trunc() and Math.round() MethodsUsing the parseInt() MethodUsing the Bitwise ... Read More
In this tutorial, we will learn to compare a string to the Boolean in JavaScript. The JavaScript has an equality operator to compare one value with another value.There are two types of equality operators in JavaScript; one is an equality operator (==), and another is a strict equality operator (===). The difference between both of them is they compare operands differently.The equality operator compares the only values of both operands and returns the Boolean value.The strict equality operators first compare the values of both operands, and if the values match, it compares the data type of both operands. In such ... Read More
When it comes to Linux operating system, everything in general can be considered as a file. In UNIX, in total, there are seven standard file types −FIFO specialBlock specialCharacter specialSocketRegularDirectorySymbolic linkWhen it comes to Files, these can be mainly categorized into the following categories −Regular FilesDirectory FilesSpecial FilesThe simplest way to find out what a particular file is in an operating system is by looking at what kind of extension that particular file has. The extensions can be '.txt', '.py', '.go', etc. If a particular file does not have any extension in Linux, then we basically call that file as ... Read More
jQuery is a feature-rich JavaScript library. We can perform a lot of actions with the help of jQuery which would otherwise require writing large pieces of code. It makes DOM manipulation, event handling, animation, ajax, etc. very easy.In this tutorial, we will learn to add the previous set of elements on the stack to the current set. jQuery maintains an internal stack of the changes that are performed to the matched stack. When the DOM traversal functions or methods are called, the new elements are pushed into the stack. So to use previous stack elements, the addBack() method is called.SyntaxWe ... Read More