To fetch value from alert pop up, use alert(). At first, use prompt() to input the value from user. Following is the code −Example Live Demo Document    var value = prompt("Please enter an integer value");    var multiplyBy10=10*value;    alert("Result ... Read More

To detect the screen resolution, use the concept of window.screen.For width, use the following −window.screen.availWidthFor height −window.screen.availHeightFollowing is the code to detect the screen resolution −Example Live Demo Document    console.log("Available Width="+window.screen.availWidth);    console.log("Available Height="+window.screen.availHeight); To run the above ... Read More

The new keyword creates an object in JavaScript. To access values, use the dot notation. Following is the code −Examplefunction newObjectCreation() {    this.firstName = "John"; } var newObject = new newObjectCreation(); newObject.firstName="David"; console.log("The first name="+newObject.firstName);To run the above program, you need to use the following command −node fileName.js.Here, my ... Read More

To attach event, use document.addEventListener() in JavaScript. Following is the code −Example Live Demo Document    document.addEventListener('click', function(event){       if(event.target && event.target.id== 'buttonSubmit'){          console.log("Event generation on the button click")       }   ... Read More

Let’s say the following is our string −var sentence = "My, , , , , , , Name, , , , is John ,, , Smith";Use regular expression along with split() and join() to remove extra spaces and commas. Following is the code −Examplevar sentence = "My, , , , ... Read More

Use document.getElementById() and display using innerHTML. Following is the code −Example Live Demo Document    var jsonObject="name";    var value = jsonObject.split(" ");    var add = {};    value.forEach(function(v){       add[v] ? add[v]++ : add[v] = "John"; ... Read More

No, the parent object won’t get updated. Use Object.assign() with some parameters and check. Following is the code −Examplevar firstObject = { name: 'John' }; var secondObject = { name: 'Carol' }; console.log("Before merging="); console.log(firstObject); var afterMerging = Object.assign({}, firstObject, secondObject); afterMerging.name = 'Smith'; console.log("After merging="); console.log(firstObject);To run the above ... Read More

To check for case insensitive values, use regular expression in JavaScript. Following is the code −Examplevar allNames = ['john', 'John', 'JOHN']; var makeRegularExpression = new RegExp(allNames.join( "|" ), "i"); var hasValue = makeRegularExpression.test("JOHN"); console.log("Is Present="+hasValue);To run the above program, you need to use the following command −node fileName.js.Here, my file ... Read More

Let’s the following is our input type, wherein the user will search −Now, use hide() and show() to display only relevant search and hide rest. For example, on typing “Ja”, related keywords like “Java” and “JavaScript” should be visible because it begins with “Ja”.Example Live Demo Document ... Read More

Let’s say the following is our table with product quantity records − qty: qty: qty: qty: Let us now hide using the hide() method. Following is the code −Example Live Demo ... Read More