Variable to track whether timer is running or not We will create a JavaScript variable to track the value of the current count in the timer. Once we have the HTML code in place, it is now time to add JS functionality by embedding the main.js file into the webpage. Countdown timer after HTML and CSS is added 3. For the CSS code, refer “Final Solution code” section at the end of this article. Hence to support start, stop and reset functionality we are adding 3 buttons with images representing each action.įurther, we can also add CSS code for the counter container, buttons, and background image. In order to add JavaScript functionalities to the app, we need to first add HTML elements allowing users to trigger the JS code on the webpage. In the below code, “countdown” is the parent container and the child container “ countdown-number” encloses the timer count value with 30 as the default value. Create Container for Timer in HTMLįirst, we need to create a container in the index.html file to display the current countdown of the timer.
We will discuss the solution for building the 30-second timer in 8 steps along with the required JavaScript, HTML, and CSS code in every step.
#A 30 second timer how to
Additionally, we will learn how to trigger an alarm sound when the timer stops at the 0th count. In this article, we will learn how to build a 30-second countdown timer with start, stop and reset functionality.
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