![javascript timer javascript timer](https://www.jqueryscript.net/images/Modern-Circular-jQuery-Countdown-Timer-Plugin-Final-Countdown.jpg)
You can add any text as innerHTML you want to display to users when the countdown expires. Create an else block and target the #timer element with the getElementById() method. You can notify users when the countdown is over if you want. This way JavaScript will add a leading zero to every one-digit number but leave two-digit numbers intact. In the code, you need to prepend every digit with a “0” and return the last two characters with slice(-2). So, slice(-2) returns the last two characters of a string. A negative value returns the targeted characters rather than slicing them off. Similarly, slice(2) removes the first two characters and returns the rest. For instance, slice(1) slices off the first character of a string and returns the rest of the string. This can be achieved with a formatting trick that makes use of the slice() method that can be used to return a portion of a data set. Although this is not necessary, the timer looks better when the number of digits doesn’t change all the time on the screen.
#Javascript timer code#
The code above adds a “0” character to hours, minutes, and seconds when their values are less than 10. You can place content into the targeted HTML elements with the innerHTML property.Īdd the following code to the if (t >= 0) block, below the time conversion calculations:ĭocument.getElementById("timer-days").innerHTML = days +ĭocument.getElementById("timer-hours").innerHTML= ("0" + hours).slice(-2) +ĭocument.getElementById("timer-mins").innerHTML= ("0" + mins).slice(-2) +ĭocument.getElementById("timer-secs").innerHTML= ("0" + secs).slice(-2) + The getElementById() method of the document object allows you to target the HTML elements you created in Step 1, respectively #timer-days, #timer-hours, #timer-mins, and #timer-secs.
![javascript timer javascript timer](https://i1.wp.com/css-tricks.com/wp-content/uploads/2020/01/timer-states.png)
Now that you have all the data in the right format, you can output the timer to the screen. Remaining seconds: Get the remaining seconds and divide it by the number of milliseconds in a single second (1000).Remaining minutes: Get the remaining minutes and divide it by the number of milliseconds in a single minute (1000 * 60 = milliseconds * seconds).Remaining hours: Get the remainder of the previous calculation using the % remainder operator and divide it by the number of milliseconds in a single hour (1000 * 60 * 60 = milliseconds * seconds * minutes).Remaining days: Divide the UTC value by 1000 * 60 * 60 * 24 which is the number of milliseconds in a single day (milliseconds * seconds * minutes * hours).
![javascript timer javascript timer](https://res.cloudinary.com/practicaldev/image/fetch/s--aJo0yJpk--/c_imagga_scale,f_auto,fl_progressive,h_720,q_auto,w_1280/https://dev-to-uploads.s3.amazonaws.com/i/a9lplpb26pznltbaifl5.png)
The rest of the calculations are as follows: Using the Math.floor() built-in JavaScript function, you can round down any float value to the nearest integer.