Скачать или смотреть How to Fix Your Javascript Tonnage Calculators and Improve User Experience

Learn how to debug and modify your Javascript calculators for tonnage, providing better output and user interaction without annoying alerts.
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This video is based on the question https://stackoverflow.com/q/67840137/ asked by the user 'Skorpios' ( https://stackoverflow.com/u/16121262/ ) and on the answer https://stackoverflow.com/a/67841565/ provided by the user 'Mister Jojo' ( https://stackoverflow.com/u/10669010/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

Have you ever encountered issues when implementing multiple calculators on a webpage? In this guide, we'll tackle a common problem faced by many developers: using multiple tonnage calculators in one JavaScript setup. If your second calculator is not functioning while the first one works perfectly, you might be wondering what went wrong with your JavaScript code.

Let's dive in and explore how we can enhance your tonnage calculators, offering a better experience for your users and ensuring everything runs smoothly!

Understanding the Problem

You started with a working tonnage calculator but faced issues when you attempted to add a second one. The intended operation was to allow users to calculate tonnage for two shapes: round holes and rectangular holes, each requiring different inputs. However, after modifying the code for the second calculator, everything stopped working. Additionally, you expressed the desire for results to be displayed on the screen rather than appearing in alerts.

Common Issues with the Current Setup

Code Redundancy: You're using two separate scripts for each calculator, which can lead to confusion and conflicts.

Complex Event Binding: There are two event handlers attached to your buttons, which may not be executing properly.

Output Handling: Using alerts instead of output fields can lead to a subpar user experience.

Solution Overview

To resolve these issues, we need to streamline the code, consolidate the event handlers, and display the output in an output field instead of an alert box. Below, we'll break down the refactored code step-by-step for clarity.

Step 1: Consolidating the HTML Structure

We will modify the HTML so that both calculators use a single form element. This simplifies the selection, input, and output handling.

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

Step 2: Streamlining the JavaScript Logic

This step involves creating a unified JavaScript logic to handle both calculators efficiently.

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

Key Enhancements:

Shared Constants: The metal properties have been stored in a single object for easy access.

Dynamic Calculations: The calculations for each shape (round or rectangle) are performed with concise handling, reducing redundancies.

Output Fields: Results are displayed in output fields instead of alerts, improving user experience.

Conclusion

By following these steps, you've transformed your JavaScript tonnage calculators into a more efficient and user-friendly tool. The changes not only fix the bugs associated with having multiple calculators but also enhance the overall functionality by offering a smooth interface for calculations.

Now, go ahead and test your new setup to ensure everything is working as expected. Happy coding!