Скачать или смотреть Creating a Bootstrap Progress Bar in Thymeleaf

Learn how to create a `Bootstrap progress bar` using Thymeleaf with clear code examples and tips to overcome common issues.
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This video is based on the question https://stackoverflow.com/q/65724444/ asked by the user 'PURU' ( https://stackoverflow.com/u/14548208/ ) and on the answer https://stackoverflow.com/a/65727211/ provided by the user 'andrewJames' ( https://stackoverflow.com/u/12567365/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Create a Bootstrap Progress Bar in Thymeleaf

Creating a progress bar using the Thymeleaf template engine can be a bit tricky due to the syntax and expressions involved. If you've ever experienced issues with progress bars in Thymeleaf, you're not alone. Many developers encounter challenges in properly implementing dynamic components like progress bars within their templates. Fortunately, with the right guidance, you can easily create a functioning progress bar that uses Bootstrap for styling. In this guide, we will break down the process into manageable sections for clarity.

The Problem

You may want to display the progress of an order in your application by using a Bootstrap progress bar. However, when trying to implement this in a Thymeleaf template, you might face syntax errors and miscalculations. For example, consider the following attempt at creating a progress bar:

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

In this case, an error occurred because of a flawed expression syntax. This led to frustration and a halt in development.

Understanding the Solution

Let's dissect what went wrong in the original attempt and how to fix it, ensuring you can create a functional progress bar in Thymeleaf.

Common Issues to Address

Syntax Errors: The incorrect placement of single quotes and other characters can throw off the Thymeleaf parser.

Integer Division: Using integers in calculations can lead to incorrect values (0 or 1) due to flooring, resulting in incorrect progress.

Separation of Expressions: To improve readability and reduce mistakes, it can be helpful to wrap each variable in its own ${...} notation.

Step-by-Step Implementation

Now, let’s look at the corrected implementation of the progress bar.

HTML Structure: Here’s the revised code for your Bootstrap progress bar with the necessary changes:

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

Key Changes Made:

Adjusting Syntax and Quotes: The last concatenation and single quotes were corrected to ensure the expression is parsed properly.

Floating Point Numbers: By multiplying order.completed by 1.0, we ensure the calculation is done in floating-point arithmetic, yielding a more accurate percentage.

Readability: We added extra parentheses for clarity, keeping the conditional logic distinct from string concatenations.

Final Thoughts

It’s important to note that this is a static progress bar. It will not automatically update its value without a round-trip to your server. If you require real-time updates, you might need additional JavaScript or AJAX calls to refresh the progress accordingly.

Now that you're equipped with the correct implementation method, you can confidently use Thymeleaf to create dynamic and functional progress bars in your application. Happy coding!