JavaScript 1 - 11 Questions

A JavaScript file has an extension of .Js. This is the standard file extension used for JavaScript files. The .Js extension helps to identify the file as a JavaScript file and allows it to be recognized and executed by JavaScript engines or interpreters. Other file extensions mentioned in the question such as .Java, .javascript, and .xml are not commonly used for JavaScript files.

In HTML, we put JavaScript code inside the

The correct answer is "is Not a Number". The isNaN() function is used to check if a value is not a number. It evaluates the argument provided and returns true if the argument is not a number, and false otherwise. This function is commonly used to validate user input in JavaScript to ensure that a numerical value is entered.

When the "Onclick()" button is clicked, the event handler associated with it will be invoked. This means that a specific function or code block will be executed in response to the button click event. The "Onclick()" event handler is commonly used to perform actions such as submitting a form, navigating to a different page, or displaying a message.

A function associated with an object is called a method. In object-oriented programming, methods are used to define the behavior or actions that an object can perform. They are typically defined within a class and can access the object's data and other methods. Methods are invoked on specific objects and can modify the object's state or return a value. Unlike functions, which are standalone and can be called independently, methods are closely tied to the object they belong to and are called using dot notation.

The prompt() function displays a dialog box with a message and a data entry field. This allows the user to enter a value or input in response to the displayed message. Therefore, prompt() is the correct answer as it fulfills the requirement of displaying both a message and a data entry field in a dialog box.

The getMonth() function returns the month as an integer. This means that the value returned by the function will be a whole number representing the month. For example, January would be represented as 1, February as 2, and so on. The use of an integer to represent the month allows for easy comparison and manipulation of dates and months in programming.

The method Prompt() contains two parameters.

The onBlur() event is used to check an empty text box. This event is triggered when the user moves the focus away from the text box. By using onBlur(), we can validate whether the text box is empty or not and perform any necessary actions accordingly. The onClick() and onFocus() events are not specifically designed for checking empty text boxes, while the "None" option is not a valid event in this context.

Int.Parse is the correct answer because it is a function that is used to parse a string into an integer. This function takes a string as input and converts it into its corresponding integer representation. It is commonly used when working with user input or when converting string representations of numbers into their numerical form for mathematical operations. The other options mentioned, such as Integer.Parse and Parse.Int, are not valid functions in most programming languages and therefore are incorrect answers.

The correct answer is "caption". The caption tag is used to give a heading to a table. It is typically placed at the top of the table and provides a brief description or title for the table. This helps to give context and clarity to the table content for the readers. The caption tag is not used for individual table cells or table headers (th), but specifically for the table as a whole.