Use localStorage.setItem(“anyKeyName”, yourValue) to set the value in local storage and if you want to fetch value then you can use localStorage.getItem(“yourKeyName”)ExampleFollowing is the code − Live Demo            Document        var textBoxNameHTML = document.getElementById('txtName');    textBoxNameHTML.addEventListener('change', (e) => {       localStorage.setItem("textBoxValue", e.target.value);    }); To run the above program, save the file name “anyName.html(index.html)”. Right click on the file and select the option “Open with Live Server” in VS Code editor.OutputThis will produce the following output on console −Now, I ... Read More

Let’s say we have the following array −var studentDetails = [    [89, "John"],    [78, "John"],    [94, "John"],    [47, "John"],    [33, "John"] ];And we need to sort the array on the basis of the first item i.e. 89, 78, 94, etc. For this, use sort().ExampleFollowing is the code −var studentDetails =    [       [89, "John"],       [78, "John"],       [94, "John"],       [47, "John"],       [33, "John"]    ]; studentDetails.sort((first, second) => second[0] - first[0]) console.log(studentDetails);To run the above program, you need to use the ... Read More

Let’s say the following is our array −var details = [    {       studentName: "John",       studentMarks: [78, 98]    },    {       studentName: "David",       studentMarks: [87, 87]    },    {       studentName: "Bob",       studentMarks: [48, 58]    },    {       studentName: "Sam",       studentMarks: [98, 98]    }, ]We need to remove the duplicate property value i.e. 87 is repeating above. We need to remove it.For this, use the concept of map().ExampleFollowing is the code −var details ... Read More

For this, use the addEventListener() with mousedown event.ExampleFollowing is the code −            Document    document.addEventListener("mousedown", function () {       console.log("Mouse down event is happening");    }); To run the above program, save the file name “anyName.html(index.html)”. Right click on the file and select the option “Open with Live Server” in VS Code editor.OutputThis will produce the following output on console −When you click the mouse, the event will generate. The console output is shown below −

At first, set a new Date in JavaScript −var dateValue = new Date("2021-01-12 10:10:20");Use new Date() along with setHours() and getHours() to add time.ExampleFollowing is the code −var dateValue = new Date("2021-01-12 10:10:20"); dateValue.setHours(dateValue.getHours() + 2); console.log("The date value is=" + dateValue.toString()); console.log("Only Hours value after incrementing=" + dateValue.getHours());To run the above program, you need to use the following command −node fileName.js. Here, my file name is demo291.js.OutputThis will produce the following output on console −PS C:\Users\Amit\javascript-code> node demo291.js The date value is=Tue Jan 12 2021 12:10:20 GMT+0530 (India Standard Time) Only Hours value after incrementing=12Read More

For this, use forEach() along with [] to an associative array.ExampleFollowing is the code −var result = {}; var names = ['John', 'David', 'Mike', 'Sam', 'Bob', 'Adam']; names.forEach((nameObject, counter) => {    var generatedValues = { [nameObject]: counter };    Object.assign(result, generatedValues) }) console.log(result);To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo290.js.OutputThis will produce the following output on console −PS C:\Users\Amit\javascript-code> node demo290.js { John: 0, David: 1, Mike: 2, Sam: 3, Bob: 4, Adam: 5 }

When we press the escape key, the event generated is detected using the keyup and keydown event handlers. When the escape key is pushed on the keyboard, the event handler runs across the page. Let’s dive into the article for getting better understanding on handling esc keydown on JavaScript popup window. Using keydown event When a key is pushed, the keydown event is triggered. The keydown event is called for all keys, regardless of whether they generate a character value, in contrast to the deprecated keypress event. While keypress shows which character was entered, keydown and keyup events give a ... Read More

To obtain dates in JavaScript, use either the new Date() or Date() function Object() { [native code] } (either current date or a specific date). While the Date() function Object()produces a string containing the current date and time, the new Date() function Object()creates a new Date object. Let’s dive into the article for getting better understanding on how to format date value in JavaScript How to Format Dates in JavaScript? Date formatting is dependent on you and your requirements. In some nations, the year (06/22/2022) comes first, then the month. In other cases, the day precedes the month, the year ... Read More

The task we are going to perform in this article is it possible to create a new data type in JavaScript. For instance, let’s consider we have variable student − var student = "username" console.log(typeof student) Now, I want to declare the type of that variable and print that in the output, and it will look like this − Output:"string" Let’s dive into the article to learn more about creating a new data type in JavaScript. Yes, it is possible to create a new data type in JavaScript, you can use the concept of Class. If you want ... Read More

The innerHTML property of an element in JavaScript allows you to access or modify any HTML or XML markup that is there. Use the method insertAdjacentHTML () to insert HTML into the page as opposed to changing an element's content. In JavaScript to change a tag’s innerHTML based on their order can be done using document.querySelectorAll(). Let’s jump into the article to learn more about changing the tag’s innerHTML based on their order. Using document.querySelectorAll() The static NodeList returned by the Document function querySelectorAll() lists all of the document's elements that match the given set of selectors. Syntax Following is ... Read More