Javascript's Articles

JavaScript, often abbreviated as JS, is a programming language that conforms to the ECMAScript specification. JavaScript is high-level, often just-in-time compiled, and multi-paradigm. It has curly-bracket syntax, dynamic typing, prototype-based object-orientation, and first-class functions.

Table td Drag and Drop in React JS: Enhancing User Experience
In the world of web development, React JS has gained immense popularity for its ability to create dynamic and interactive user interfaces. One crucial feature that can greatly enhance the user experience is table td drag and drop in React JS. This functionality allows users to effortlessly rearrange table data by dragging and dropping table cells. In this article, we will explore the implementation of this feature using React JS and delve into its benefits for web applications. The Power of Table td Drag and Drop in React JS Streamlining Data Manipulation with Drag and Drop Tables are commonly used to present structured data in web applications. However, manipulating table data can sometimes be cumbersome, especially when it involves rearranging rows or columns. With the power of drag and drop in React JS, users can now easily modify the order of table cells by dragging them to desired locations. This intuitive interaction provides a seamless way to organize and prioritize data. Enhancing User Experience and Productivity The drag and drop functionality not only simplifies data manipulation but also enhances the overall user experience. By enabling users to rearrange table cells effortlessly, React JS empowers them to customize the presentation of data according to their preferences. This increased control over the user interface boosts productivity and allows users to focus on the most relevant information. Making Complex Operations Simple React JS provides a robust set of tools for implementing drag and drop functionality. With the help of libraries like React DnD, developers can effortlessly integrate drag and drop features into their applications. This simplifies complex operations such as reordering table rows or columns, making the development process more efficient and less time-consuming. Implementing Table td Drag and Drop in React JS To implement table td drag and drop in React JS, we need to follow a series of steps. Let's dive into the details: Step 1: Setting Up a React JS Project Before we can start implementing drag and drop functionality, we need to set up a React JS project. Here's a brief overview of the steps involved: Install Node.js and npm (Node Package Manager) if they are not already installed. Open a terminal or command prompt and navigate to the desired location for your project. Use the command npx create-react-app drag-and-drop-app to create a new React JS project called "drag-and-drop-app." Once the project is created, navigate into the project folder using the command cd drag-and-drop-app. Step 2: Installing React DnD Library React DnD is a popular library that simplifies the implementation of drag and drop functionality in React JS applications. To install React DnD, follow these steps: In the terminal or command prompt, make sure you are inside the project folder. Use the command npm install react-dnd react-dnd-html5-backend to install React DnD and its HTML5 backend. Step 3: Creating a Draggable Table Once the project is set up and the required libraries are installed, we can proceed to create a draggable table. Here's how we can accomplish this: Open the project in your preferred code editor. In the "src" folder, create a new component called "DraggableTable.js" using the command touch DraggableTable.js. Open "DraggableTable.js" and import the necessary components from React and React DnD. import React from 'react'; import { useDrag, useDrop } from 'react-dnd';   Define the structure of the draggable table by creating a new functional component. const DraggableTable = () => { // Component logic goes here };   Inside the component, define the individual table cells that are draggable. const DraggableCell = ({ cellData }) => { const [{ isDragging }, drag] = useDrag(() => ({ type: 'cell', item: { cellData }, collect: (monitor) => ({ isDragging: monitor.isDragging(), }), })); return ( <td ref={drag} style={{ opacity: isDragging ? 0.5 : 1 }}> {cellData} </td> ); };   Create a new functional component for the table itself.  const DraggableTable = () => { // Component logic goes here return ( <table> <tbody> <tr> <DraggableCell cellData="Data 1" /> <DraggableCell cellData="Data 2" /> <DraggableCell cellData="Data 3" /> </tr> {/* Additional table rows go here */} </tbody> </table> ); }; Export the DraggableTable component at the end of the file. export default DraggableTable;   Step 4: Implementing Drop Functionality In addition to making table cells draggable, we also need to implement the drop functionality. This will allow users to drop the dragged cells in desired locations within the table. Here's how we can achieve this: Inside the DraggableTable component, import the necessary components from React DnD. import { useDrag, useDrop } from 'react-dnd';   Modify the DraggableCell component to enable drop functionality. const DraggableCell = ({ cellData }) => { const [{ isDragging }, drag] = useDrag(() => ({ type: 'cell', item: { cellData }, collect: (monitor) => ({ isDragging: monitor.isDragging(), }), })); const [{ canDrop, isOver }, drop] = useDrop(() => ({ accept: 'cell', drop: () => { // Logic for handling dropped cell goes here }, collect: (monitor) => ({ canDrop: monitor.canDrop(), isOver: monitor.isOver(), }), })); const isActive = canDrop && isOver; return ( <td ref={drag(drop)} style={{ opacity: isDragging ? 0.5 : 1, backgroundColor: isActive ? 'yellow' : 'transparent' }}> {cellData} </td> ); };  
How to Install Tailwind in React.js
Introduction Are you a React.js developer looking to enhance your web development projects with the power and flexibility of Tailwind CSS? Look no further! In this comprehensive guide, we will walk you through the process of installing Tailwind CSS in React.js, enabling you to leverage the full potential of this popular utility-first CSS framework. From step-by-step instructions to FAQs and expert tips, we've got you covered. Let's dive in! How to Install Tailwind in React.js So, you're ready to incorporate the awesomeness of Tailwind CSS into your React.js application? Follow the simple steps below to get started: Step 1: Create a New React.js Project Before we begin, make sure you have Node.js and npm (Node Package Manager) installed on your machine. Open your terminal and run the following command to create a new React.js project: npx create-react-app my-tailwind-project This command sets up a new React.js project named "my-tailwind-project" in a directory of the same name. Once the project is created, navigate to the project directory using the command: cd my-tailwind-project Step 2: Install Tailwind CSS To install Tailwind CSS, open your terminal and run the following command: npm install tailwindcss This command fetches and installs the latest version of Tailwind CSS from the npm registry. Step 3: Configure Tailwind CSS After installing Tailwind CSS, you need to set up the configuration files. Run the following command in your terminal: npx tailwindcss init This command creates a tailwind.config.js file in your project's root directory. This file allows you to customize various aspects of Tailwind's default configuration. Step 4: Import Tailwind CSS To import Tailwind CSS styles into your React.js project, open the src/index.css file and add the following line at the top: @import 'tailwindcss/base'; @import 'tailwindcss/components'; @import 'tailwindcss/utilities'; Step 5: Apply Tailwind CSS Classes You're almost there! Now you can start using Tailwind CSS classes in your React components. Open a React component file, such as src/App.js, and add Tailwind CSS classes to your HTML elements as needed. For example: import React from 'react'; function App() { return ( <div className="bg-blue-500 text-white p-4"> <h1 className="text-3xl font-bold">Hello, Tailwind!</h1> <p className="mt-2">Tailwind CSS is awesome!</p> </div> ); } export default App; Save the file, and you'll see the Tailwind CSS styles applied to your components.
How to create a new React JS project.
React JS is a popular open-source JavaScript library for building user interfaces. It was created by Facebook in 2011 and is currently maintained by Facebook and a community of developers. React is widely used for developing single-page applications, mobile applications, and complex web applications. React is based on the concept of reusable components. A component is a modular, self-contained block of code that encapsulates a specific functionality or user interface element. React components can be composed to create complex user interfaces, and they can be reused across different parts of an application. One of the main benefits of React is its ability to handle complex user interfaces and large-scale applications with ease. It provides a virtual DOM, which is a lightweight representation of the actual DOM, and updates only the necessary parts of the UI when a change occurs, resulting in better performance and faster rendering. React is also highly flexible and can be used with other libraries and frameworks, such as Redux for state management, React Router for routing, and Axios for data fetching. Overall, React has become a popular choice for building modern web applications due to its flexibility, modularity, and performance benefits. 1. Install Node.js and NPM Install Node.js and npm on your machine if you haven't already. You can download and install it from the official website: 2. Open terminal Open your terminal, by pressing the shortcut key CTRL + ALT + T or go to the menu and click Terminal and navigate to the folder where you want to create the project. 3. Create a new project Create a new React project using the create-react-app command. To do this, run the following command in your terminal: npx create-react-app new-project Here, new-project is the name of the project you want to create. You can replace it with any other name you like. 4. Checkout into the project Once the project is created, navigate to the project folder by running the following command in your terminal: cd new-project 1. Start the development server Now, you can start the development server by running the following command: npm start This will open the development server in your default browser at http://localhost:3000/. You can now start building your website using React components. You can create a new component for each page and include them in your App.js file. You can also add CSS styles and other functionality as needed. Once you have finished building your blog content, you can deploy your project to a hosting platform such as Netlify, Heroku, or GitHub Pages. That's it! You now have a new React JS project.
Javascript Convert Date and Time Example
In this article, we will share with you how to convert date and time in various examples. in the web application, we will be done much functionality with javascript and it is very easy to do from the client-side. many times we will need to convert date and time in many formats. here we will be going to share with you some basic needful dates and times converted with hours, minutes, mili-seconds, etc... Example - 1 Convert hours to minutes : Here, we are creating one javascript function and write into it how to convert hours to minutes in javascript. <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Convert hours to minutes - HackTheStuff</title> </head> <body> <script type = "text/javascript"> function convertHourstoMinute(hours) { return Math.floor(hours * 60); } var minutes = convertHourstoMinute(2); document.write("Convert hours to minutes is :- " + minutes); </script> </body> Example - 2 Convert hours to seconds : In this example, we will create one javascript function that returns us seconds of the passed hours value in the function. <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Convert hours to seconds - HackTheStuff<</title> </head> <body> <script type = "text/javascript"> function convertHourstoSeconds(hours) { return Math.floor(hours * 60 * 60); } var seconds = convertHourstoSeconds(2); document.write("Converting hours to seconds is :- " + seconds); </script> </body> </html> Example - 3 Convert hours to milliseconds : In this above example, we can see how to convert hours to milliseconds in javascript. <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Convert hours to milliseconds - HackTheStuff<</title> </head> <body> <script type = "text/javascript"> function convertHourstoMilliseconds(hours) { return Math.floor(hours * 60 * 60 * 1000); } var milliseconds = convertHourstoMilliseconds(2); document.write("Converting hours to milliseconds is :- " + milliseconds); </script> </body> </html> Example - 4 Convert minutes to seconds : In this example, we will see how to convert minutes to seconds in javascript. <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Convert minutes to seconds - HackTheStuff</title> </head> <body> <script type = "text/javascript"> function convertMinutestoSeconds(minutes) { return Math.floor(minutes * 60); } var minutesToSeconds = convertMinutestoSeconds(2); document.write("Converting minutes to seconds is :- " + minutesToSeconds); </script> </body> </html> Example - 5 Convert minutes to milliseconds : In this example, we see how to convert minutes to milliseconds in the javascript example. <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Convert minutes to Milli seconds - HackTheStuff</title> </head> <body> <script type = "text/javascript"> function convertMinutestoMilliSeconds(minutes) { return Math.floor(minutes * 60 * 1000); } var minutesToMilliSeconds = convertMinutestoMilliSeconds(2); document.write("Converting minutes to milli seconds is :- " + minutesToMilliSeconds); </script> </body> </html> Example - 6 Convert seconds to milliseconds : In this example, we see how to convert seconds to milliseconds in javascript. <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Convert seconds to milliseconds - HackTheStuff</title> </head> <body> <script type = "text/javascript"> function convertSecondstoMilliSeconds(seconds) { return Math.floor(seconds * 1000); } var secondsToMilliSeconds = convertSecondstoMilliSeconds(2); document.write("Converting seconds to milliseconds is :- " + secondsToMilliSeconds); </script> </body> </html> Example - 7 Convert date to milliseconds : In this example, we see how to convert date to milliseconds in javascript. <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Convert date to milliseconds - HackTheStuff</title> </head> <body> <script type = "text/javascript"> var date = new Date(); var milliseconds = date.getTime(); document.write("Converting date to milliseconds is :- " + milliseconds); </script> </body> </html> Example - 8 Convert seconds to hh mm ss : In this example, we see how to convert seconds to hh mm ss format. <html lang="en"> <head> <meta charset="utf-8"> <title>Convert seconds to hh mm ss - HackTheStuff</title> </head> <body> <script type = "text/javascript"> function convertSecondsTo(sec) { var hours = Math.floor(sec / 3600); var minutes = Math.floor((sec - (hours * 3600)) / 60); var seconds = sec - (hours * 3600) - (minutes * 60); seconds = Math.round(seconds * 100) / 100 var result = (hours < 10 ? "0" + hours : hours); result += "-" + (minutes < 10 ? "0" + minutes : minutes); result += "-" + (seconds < 10 ? "0" + seconds : seconds); return result; } var secondsTo = convertSecondsTo(1000); document.write("Converting to seconds in HH-MM-SS format :- " + secondsTo); </script> </body> </html> We hope you like this small article and it will be help you a lot.
How to get Local Time Instead of Server Time
Suppose you are managing blog website and your user-base location are different instead of specific region. In the blog, you are displaying post creation date and times, so it is become important that you display different time according to user's location time instead of your server's time. In this article we will display time according to user timezone instead of server time. For displaying time, we will use Moment.js library. You can also use 3rd party API services, like GeoIP to get user's timezone from their IP addresses. Moment.js is the most innovative Javascript library for displaying and manipulating time. It is designed to work in the browser and Node.js. To use moment.js, first include bellow moment.js CDN file. <script src=""></script> <script src=""></script> And this is the element you want to display time in the blog post. <div class="post">     <span id="post-time"></span> </div> For the simplicity, we have used jQuery to understand code easily. We had used PHP as backend language to get server time and assigned it to Javascript variable. <script type="text/javascript">     $(document).ready(function() {         // created Javascript variable         var createdAt = moment('<?php echo($post->created_at) ?>');         // get timezone different between local server to UTC timezone         var timeDifference = new Date().getTimezoneOffset();         // change time according to local time from server time         var time = moment(createdAt).subtract(timeDifference, 'minutes').format('DD/MM/YYYY, hh:mm:ss A');         // change time in element         $('#post-time').html(time);     }); </script> That's it. <span id="post-time"> will change server time to user's local time. You can add format() method to change format of the time you want to display. I Hope you like this article. In upcoming article, we will discuss usage of Moment.js.
Convert Json Data to HTML Table Using json2html Javascript Library
json2html is a easy and fast javascript HTML template library used to transform JSON objects into HTML using a another user specified JSON template, which we call transforms. json2html can be used with Native Javascript using core library jQuery using jQuery and core library to include jquery events Node.js using Node.js on server side Usage First download json2html package from the GitHub and include the json2html.js file in <head> tag. Instead, you can also use json2html CDN file if you do not want to download and include in your project. <script src=""></script> Then include one <script> tag before </body> tag close. Create a variable of template which defines how you want to render Json in your HTML page. let template =      {"<>": "li", "id":"${id}", "html":[         {"<>": "span", "text": "${name} (${year})"}     ]}; <> specifies the type of DOM element you want to render like div, li, span etc.. html specifies the innerHTML DOM element will contain inlcuding all DOM children or title of tag Then includes json data in data variable. let data = [     {"title":"Heat","year":"1995"},     {"title":"Snatch","year":"2000"},     {"title":"Up","year":"2009"},     {"title":"Unforgiven","year":"1992"},     {"title":"Amadeus","year":"1984"} ]; Inludes HTML tag in <body> tag where you want to render the table. <ul id="result"></ul> Lastly render the HTML table using json2html.transform method. document.getElementById('result').innerHTML = json2html.transform(data, template); This will generate bellow HTML code: <ul id="result">     <li>         <span>Heat 1995</span>     </li>     <li>         <span>Snatch 2000</span>     </li>     <li>         <span>Up 2009</span>     </li>     <li>         <span>Unforgiven 1992</span>     </li>     <li>         <span>Amadeus 1984</span>     </li> </ul> You can also use jQuery plugin to include jquery events. For that, first include jQuery CDN in <head> tag. <script src=""></script> In the last step, render HTML using json2html method. $('#result').json2html(data, template); Events While using with jQuery library, you can also embed jQuery events whithin a transform. This events will trigger when transform is applied to the DOM element. Here is some supported events: onclick onblur ondblclick ondie onerror onchange onhover onfocus etc.. {'<>':'button','onclick':function(e) {     //e.event : the jQuery event     //  : user specified data from the the json2html options variable eventData (see Usage)     //e.index : the index of the array in which the source object was found     //e.obj   : the source object that we are transforming     console.log(e.obj); }} You can also access the source jQuery element that called the event using $(this). {'<>':'span','onclick':function(){ $(this).hide(); } Server side render For server side, we will use Node.js. First download json2html package by npm. npm install node-json2html Then define json2html constant and template variable. Also define json data variable. const json2html = require('node-json2html');   let template = {'<>':'div','html':'${title} ${year}'};      let data = [     {"title":"Heat","year":"1995"},     {"title":"Snatch","year":"2000"},     {"title":"Up","year":"2009"},     {"title":"Unforgiven","year":"1992"},     {"title":"Amadeus","year":"1984"} ]; Then render json data to HTML table.   let html = json2html.transform(data,template); Conclusion This way, you can easily create HTML table from the json data. I hope it will help you.
jQuery and JavaScript Code Examples
In the previous article, we have discussed on what is Javascript and JQuery. We have also discussed on main differences between them. In this article we will go through code comparision between Javascript and JQuery with example. JavaScript and jQuery code examples Here is the bellow examples, so let's check bellow examples: Writing Javascript and JQuery code in HTML document Javascript is directly written between <script> tags. Javascript external file can also be included in HTML document. <script src="path/to/external/javascript-file.js"></script> <script>     document.getElementById("myid").innerHTML = "Hello World"; </script> JQuery code is dependant on JQuery library. So you have to include JQuery library file or CDN file before JQuery code in HTML document. <head>     <script src="jquery-3.5.0.min.js"></script> </head> HTML tag selection and manipulation To select HTML tag in Javascript, use document.querySelector() method or other methods as per tag. document.querySelector('#id'); or document.getElementById('idname'); or select by class document.getElementsByClassName('classname'); or select by element document.getElementsByTagName('p'); In JQuery $ sign used with selector in bracket. $(selector) or $('#idname') or $('.classname') or $('p') Event handling To handle event in Javascript, write addEventListener() method with event name. document.getElementById('idname').addEventListener('click', function() {     alert('Hello World'); }); In JQuery all event has defined method to handle. $('.classname').click(function() {    // here comes acion }); or submit form $('#idname').submit(function() {    // here comes acion }); or to use multiple event with on() method $('#input').on ('click change', function() {    // here comes acion }); Change CSS property To change the style of an HTML element in Javascript, use: document.getElementById('idname').style.color = '#f2f2f2'; in JQuery, change CSS with css() method: $('#idname').css('color', '#f2f2f2'); Changing or adding value of an Attribute To change the value of HTML element attribute in Javascript, use: document.getElementById('idname').href = "/new-url"; To change value in JQuery, use attr() method: $('#idname').attr('href', '/new-url'); Create Ajax request Creating Ajax request in Javascript with new XMLHttpRequest object and send request to server. There is open('methodType', 'URL', async) method with parameters and send() method with data creates Ajax request. Create get method request: var xhttp = new XMLHttpRequest();'GET', 'request-url', true); xhttp.send(); Or create post method request: var xhttp = new XMLHttpRequest();'POST', 'request-url', true); xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); xhttp.send('id=5&name=javascript'); To create Ajax request, there are many syntax in JQuery. Bellow are main methods which are widely used: $.ajax({     type: "post",     url: 'request-url',     data: data,     success: function(response) {         // what to do after ajax complete     } }); Or shorthand method: $.get('request-url', function(response) {     $('#result').html(response); }); or more simply: $('#result').load('request-url'); Create animation Creating animation is also difficult and requires many lines of code. JavaScript use the setInterval(), clearInterval(), setTimeout() and clearTimeout() methods and CSS transform, translate or animate properties to create animation. Here is the simple animation in Javascript: setInterval(myAnimation, 5);     function myAnimation(){     document.getElementById ("#idname").style.transform=‘translate(100px, 100px)’;     document.getElementById ("#idname").style.transform=‘rotate(30deg)’; } In JQuery there are several direct methods which are used to create fast and easy animation: Css animation $('#idname').animate({height: '100px'}); Hide/Show animation $('.hide-class').hide(); $('show-class').show(); or toggle() to hide/show respectively. $('show-class').toggle(); Create fade effect with fadeIn() or fadeOut() method: $('#idname').fadeIn(); $('#idname').fadeOut(); There are many functions in JQuery to create animations. But it is also noted that Javascript can also work in graphic animations like on <canvas> tag while JQuery only works in HTML dom elements: Which one you liked? Javascipt is difficult compared to JQuery, so most of us use JQuery for most of work. While Javascript is language and has widly use with other technologies while Jquery is Javascript library for HTML dom manipulation. So it mostly used in web development. In the conclusion, both have its own usage in software development. I hope you will like this article.
Check if Array is Empty or null in Javascript
When working in Javascript, many times you need to check if array is empty or undefined. This needs to check when you want to loop the array, so it doesn't return error. There are lot of ways to check if Javascript array is empty or not. Here are some examples: Checking by array length The first way to check is to get array length. If the array length is 0, then it empty array. <script type="text/javascript">     var newArray = [1];     if (newArray && newArray.length > 0) {         // newArray is not empty     } else {         // newArray is empty     } </script> Checking if array is not undefined Sometimes you also want to check that array should not be undefined object and has at least one element. This can be also check with typeof. <script type="text/javascript">      var undefinedAray = undefined;     if (typeof undefinedAray !== "undefined" && undefinedAray.length > 0) {         // undefinedAray is not empty     } else {         // undefinedAray is empty or undefined     } </script> Using JQuery isEmptyObject() method We can also use JQuery isEmptyObject method to check whether array is empty or contains elements. This is reliable method. <script src=""></script> <script type="text/javascript">     var newArray1 = [1, 2, 3];     var newArray2 = [];     console.log(jQuery.isEmptyObject(newArray1)); // returns false     console.log(jQuery.isEmptyObject(newArray2)); // returns true </script> This way you can check wether array contains element or is empty. I hope this article will help you a little.