Tables are a common way to organize and display data in HTML. If you're working with tables dynamically in JavaScript, you might need to count the rows in an HTML table for various purposes, such as validation, manipulation, or displaying statistics. In this article, we will demonstrate how to retrieve the row count of an HTML table using JavaScript. We will use the rows Attribute to access the row count through rows.length, while in the other method, we will specifically count the rows through tbody selection. What is rows Attribute? The rows attribute in HTML is used to define the ... Read More

To set an element and it’s text, use the text() method in jQuery. With that, use the :nth-child selector to place it at a particular position. Following is the code −Example Live Demo Document JavaScript MySQL MongoDB Java C#    $('h1:nth-child(4)').text("Python"); To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.OutputThis will produce the following output −

To group JSON data, you need to extract all the keys and use the push(). Following is the code −Examplevar details= {    "1":    {       name:"John"    },    "2":    {       name:"John"    },    "3":    {       name:"David"    }    var objectWithGroupByName = {};    for (var key in details){       var name = details[key].name;    if (!objectWithGroupByName[name]){       objectWithGroupByName[name] = [];    }    objectWithGroupByName[name].push(details[key]); } console.log(objectWithGroupByName);To run the above program, you need to use the following command −node fileName.js.OutputHere, my file name is demo122.js. This will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo122.js {    John: [ { name: 'John' }, { name: 'John' } ],    David: [ { name: 'David' } ] }

Let’s say the following is our variable −var message = 'This is the Class Demo';Following is our object, var object = new FirstClass(message)The class FirstClass −class FirstClass{    constructor( message){       this.message = message;    } }We will use eval() to call a JavaScript class object with variable. Following is the code −Exampleclass FirstClass{    constructor( message){       this.message = message;    } } var message = 'This is the Class Demo'; var object = new FirstClass(message) console.log(eval(object).message);To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo121.js.OutputThis ... Read More

In this article, we will learn to Submit a textbox by pressing ENTER in JavaScript. Submitting a textbox form by pressing the ENTER key is a common requirement in web development, enhancing the user experience by making interactions smoother and more intuitive. Why Enable Form Submission on ENTER Key Press? Allowing users to submit a form by pressing the ENTER key is an efficient way to enhance usability and reduce friction in the user interface. Whether you're building a search bar, login form, or any other type of text input, implementing this feature saves time and makes interactions feel ... Read More

Let’s say the following is our comma separated text in div − This, is, the, first, JavaScript, program To convert comma separated text into separate lines, you need to use trim() along with split() on the basis of comma(, ).Example Live Demo Document This, is, the, first, JavaScript, program    var allTheData = document.querySelector('.commaSeparated').textContent.trim().split(', ')    var separateList = ''    allTheData.forEach(function(value) {       separateList += '' + value + '';    });    separateList += '';    document.querySelector(".commaSeparated").innerHTML = separateList; To run the ... Read More

Let’s say the following is our nested objects −var details = [    {       id:"101",       firstName:"John",       lastName:"Smith",       age:25,       countryName:"US",       subjectDetails: {          subjectId:"Java-101",          subjectName:"Introduction to Java"       },    },    {       "uniqueId": "details_10001"    } ]Use map() along with typeOf to access nested objects. Following is the code −Examplevar details = [    {       id:"101",       firstName:"John",       lastName:"Smith",       ... Read More

Let’s say the following is our object −var details = {    firstName: 'John',    lastName: '',    countryName: 'US' }Use Object.keys() along with find() to get the key name with empty value. Following is the code −Examplevar details = {    firstName: 'John',    lastName: '',    countryName: 'US' } var result = Object.keys(details).find(key=> (details[key] === '' || details[key] === null)); console.log("The key is="+result);To run the above program, you need to use the following command −node fileName.js.OutputHere, my file name is demo118.js. This will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo118.js The key is=lastNameRead More