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The keypress event is triggered when a user presses a key on their keyboard. This event can be used to do things like restrict the input that a user can enter, or to show an error message if the user enters an invalid character.   To prevent the keypress event, you can use the preventDefault() method. This method is called on the event object that is passed to the event listener function. The following code shows how to prevent the keypress event from being triggered when a user presses a letter key on the name input field: const nameInput = document . getElementById ( 'fname' ); nameInput. addEventListener ( 'keypress' , function ( event ) { const allowedCharacters = /^[a-zA-Z]+$/ ; if (!allowedCharacters. test (event. key )) { event. preventDefault (); } });   In this code, the allowedCharacters regular expression is used to check if the key that the user pressed is a letter. If the key is not a letter, the prev

Introduction: Countdown timers can be a useful tool for creating a sense of urgency and excitement for an upcoming event or promotion. In this tutorial, we will show you how to create a dynamic countdown timer using JavaScript. You will learn how to calculate the time remaining until a specific date, and display the result in days, hours, minutes, and seconds. We will also show you how to handle the countdown expiration and display a message when the time is up. Step 1: Set the countdown date The first step is to set the date that you want the countdown timer to count down to. This can be any date in the future, and you can set it using the JavaScript Date object. Here is an example of how to set the countdown date to January 6th, 2023 at 3:37pm: Copy code var countDownDate = new Date ( 'Jan 6, 2023 15:37:25' ). getTime (); Step 2: Set the countdown interval Next, we need to create a function that will be called at regular intervals to update the countdown timer. We can use t