Скачать или смотреть How to Display a Grouped Bar Chart Using Chart.js

Learn how to create a `grouped bar chart` with Chart.js by fixing common issues and following simple steps.
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This video is based on the question https://stackoverflow.com/q/62574738/ asked by the user 'Nooh Ahamad' ( https://stackoverflow.com/u/11720690/ ) and on the answer https://stackoverflow.com/a/62578287/ provided by the user 'uminder' ( https://stackoverflow.com/u/2358409/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Display a Grouped Bar Chart Using Chart.js

If you are looking to create a visually appealing and informative grouped bar chart with Chart.js, you've come to the right place! In this post, we'll walk through a common issue many face when attempting to display such charts, and I'll provide you with a clear solution to get your chart up and running.

The Problem: Why is the Chart Not Displaying?

You might find yourself in a situation where your code for a grouped bar chart runs without throwing any errors, yet the chart doesn’t display on the screen. Here’s what could be causing the issue:

Context Retrieval Issue: When you try to access the 2D context of your canvas, the method you use may not be correct.

Syntax Errors: Using incorrect characters for strings can lead to potential pitfalls that prevent the chart from rendering.

The Original Code

To better understand the issues, let’s review the original code provided:

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The Solution: Fixing the Issues

Let’s now address the problems and provide the corrected code.

Step 1: Properly Retrieve the 2D Context

Ensure you access the 2D context correctly. Instead of casting the element as an HTML canvas, simply use the following line:

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Step 2: Correct Any Syntax Errors

Pay attention to your apostrophes. Replace any strange or malformed apostrophes in your labels and string values to ensure your code runs smoothly.

The Corrected Code

Here’s the amended code that integrates the above corrections:

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Step 3: Include Chart.js Library

Don't forget to include the Chart.js library in your HTML to avoid missing dependencies:

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Conclusion

By following these steps and implementing the corrections, your grouped bar chart should now display correctly with Chart.js. Test it out, and watch how your data comes to life in visually compelling ways! Not only does this enhance the data's appearance, but it also improves its accessibility and understanding for your audience. Happy charting!