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Showing posts with the label Javascrip Interview Questions and Answers

Troubleshooting Guide: Windows 11 Taskbar Not Showing - How to Fix It

  If your Windows 11 taskbar is not showing, you can try several troubleshooting steps to resolve the issue. Here are some potential solutions you can try:

Exploring Dynamic Navigation: Using for Relative Paths in JavaScript

  To open a new browser window using a relative path in JavaScript, you can use the method with a relative URL. Here's an example: window . open ( './relative/path/to/page.html' , '_blank' ); In this example, ./relative/path/to/page.html is the relative path to the HTML page you want to open. The ./ at the beginning represents the current directory. You can modify the path according to your file structure. The second argument, '_blank' , specifies that the URL should be opened in a new tab or window, depending on the user's browser settings. Make sure that the script containing this code is running within the context of a web page, as the window object is only available in browser environments.

Controlling Browser Refresh: Disabling F5 with JavaScript

  In JavaScript, it is not possible to directly disable the refresh functionality triggered by the F5 key in a web browser. The functionality of the F5 key is handled by the browser itself, and JavaScript does not have control over it for security reasons. However, you can detect the keypress event for the F5 key and prevent its default behavior, which effectively stops the refresh action. Here's an example of how you can achieve this: document . addEventListener ( 'keydown' , function ( event ) { var key = event. key || event. keyCode ; if (key === 'F5' || key === 'Refresh' ) { event. preventDefault (); // Optionally, you can display a message or perform any other action here. } }); This code adds an event listener to the keydown event of the document and checks if the pressed key is either "F5" or "Refresh". If it matches, the preventDefault() method is called on the event object to prevent the default behavior (re

URL Encoding in JavaScript: Safely Handling Special Characters

  To encode a URL in JavaScript, you can use the encodeURIComponent() function. This function takes a string as input and returns the encoded version suitable for use in a URL. Here's an example of how to encode a URL using JavaScript: var url = ' 2' ; var encodedURL = encodeURIComponent (url); console . log (encodedURL); In this example, the encodeURIComponent() function is used to encode the url variable. The resulting encoded URL is stored in the encodedURL variable. Finally, the encoded URL is printed to the console. The output will be: https% 3 A% 2 2 F% 3 Fparam% 3 Dvalue%26param2% 3 Dvalue%202 Note that the function encodes special characters in the URL, such as : (%3A), / (%2F), ? (%3F), & (%26), and spaces (%20), to ensure that they are properly represented in a URL.

Demystifying the 'TypeError: array.splice is not a function' in JavaScript

  The error message "TypeError: array.splice is not a function" typically occurs when you try to use the splice method on a variable that is not an array. To solve this error, you need to ensure that the variable you are working with is indeed an array. Here are a few steps you can take to troubleshoot and resolve the issue: Check the variable type: Verify that the variable in question is actually an array. You can use the Array.isArray() method to determine if a variable is an array or not. For example: if ( Array . isArray (myArray)) { // Perform operations on the array } else { // Handle the variable not being an array } Review variable assignment: Examine how the variable is being assigned. Make sure it is explicitly initialized as an array. For example: const myArray = []; // Correctly initializes an empty array const myArray = someFunction (); // Ensure that the function returns an array Debug the code flow: If the variable is being modified or passed throu

JavaScript Object Manipulation: Removing Properties Simplified

To remove a property from a JavaScript object, you can use the delete operator. Here's an example: // Create an object const person = { name : 'John' , age : 30 , city : 'New York' }; console . log (person); // Output: { name: 'John', age: 30, city: 'New York' } // Remove a property delete person. age ; console . log (person); // Output: { name: 'John', city: 'New York' } In the example above, we have an object called person with three properties: name , age , and city . We want to remove the age property from the object, so we use the delete operator followed by the object name and the property name we want to remove ( delete person.age ). After deleting the property, the object is updated, and the age property is no longer present.