Once we have the HTML5 audio element, we need to load the audio file using JavaScript code. In the final step to make the countdown timer imitate a real timer, we will be adding an alarm sound on timeout.įirst, we need to add a HTML 5 tag to index.html, even though it doesn’t add anything on the screen, it enables javascript to embed an audio file. Select action buttonsĬonst startButton = document.getElementById("start") Ĭonst stopButton = document.getElementById("stop") Ĭonst resetButton = document.getElementById("reset") Learn more about JavaScript events from /javascript-events.
10 SECOND TIMER WITH SOUND CODE
In the below code we assign the start button with startTimer(), reset button with resetTimer, and stop button with stopTime. We accomplish that by assigning the Button DOM element with the respective JavaScript function. In order to make timer operations, we need to allow users to trigger functionalities from the screen. The countdown timer is non-functional for the user despite having implemented all JavaScript functionality along with HTML + CSS webpage. Assigning function as onclick() event for button Function to stop Timerįor the reset funtionality, in addition to clearInterval(), we need to reassign the “remainingTime” variable with the 30 default value and display it on screen using “countContainer.innerHTML”. We define stopTimer() function which performs pause functionality for the timer by using clearInterval() on the timer variable which has the id of the timer triggered earlier by setInterval() call. Select Countdown containerĬonst countContainer = document.getElementById("countdown-number") ĬountContainer.innerHTML = remainingTime In the case of timeout, the setInterval() timer is cleared, and the “remainingTime” is reset to 30. The renderTimer() function ensures that “remainingTime” variable is decremented and displayed on screen. To display the timer count, we need to assign “countContainer” innerHTML property with the count value, which ensures the inner HTML of the selected DOM element contains the timer count value.īy using setInterval() ensures renderTime() function is executed every 1 second.
Next, we will create “ startTimer” JS function which only executes if “isStopped” value is true, to avoid multiple setInterval() calls when the timer is already running. To implement start functionality in the countdown timer, first, we assign the selected DOM with the countdown HTML container to a variable. 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.
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