Fixing the NaN Error in Your JavaScript Countdown Timer for Shopify

Learn how to solve the `NaN` issue in your JavaScript countdown timer, ensuring it displays `0` correctly when the countdown ends.
---

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Javascript 10 minute countdown timer NaN error

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Fix the NaN Error in Your JavaScript Countdown Timer

If you're running a Shopify store and trying to implement a countdown timer, you may have encountered a frustrating issue where the timer sometimes displays NaN instead of 0 when it reaches the end. This NaN (Not a Number) error can be annoying and lead to confusion for your customers. In this guide, we'll break down the problem and provide a solution to ensure your timer functions properly every time.

The Countdown Timer Code Breakdown

Your current countdown timer code structure looks something like this:

[[See Video to Reveal this Text or Code Snippet]]

Understanding the Problem

In the above code, when the countdown timer reaches zero, the else block encounters issues retrieving the timer value. If the countdown has not been set properly, the distance variable may result in NaN when it calculates the remaining time. This can happen when myTimer is not correctly stored or retrieved from localStorage. Since myTimer could be null, it leads to some unexpected behavior.

The Solution: Correcting the Timer Logic

To resolve the NaN error, the key is to adjust the way we check for the timer value retrieved from localStorage. You should modify the conditional check to include a check for both null and the string 'null'. Here’s the updated code segment that addresses this specific problem:

Updated Code Snippet

Change this part of your code:

[[See Video to Reveal this Text or Code Snippet]]

to this:

[[See Video to Reveal this Text or Code Snippet]]

Why This Works

This change ensures that if there was ever a situation where myTimer is stored as a string 'null' (which can happen if the key was set but with an invalid value), your code will correctly recognize that the countdown needs to be set again. This will prevent your timer from attempting to calculate distance using a null or 'null' value, thus avoiding the NaN issue entirely.

Final Setup

After implementing the above changes, your countdown timer should function without any hiccups. It should display all the remaining minutes and seconds accurately and show 0 once the countdown ends without any abnormal glitches.

Summary

Problem: Timer sometimes shows NaN instead of 0.

Solution: Modify the conditional check for myTimer to handle both null and the string 'null'.

Result: A smooth countdown experience for your Shopify customers.

By following this guide, you'll be able to fix the NaN error in your JavaScript countdown timer and keep your customers engaged without confusion! If you have any additional questions or need further assistance, feel free to ask in the comments below.