[Bug]: How To Change Bar Color By ItemStyler?

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Introduction

In this article, we will explore a bug in the Ag-Grid library, specifically in the itemStyler function of the chartThemeOverrides object. The bug is that the itemStyler function is not working as expected, and we are unable to change the bar color of the chart.

Reproducible Scenario

The reproducible scenario can be found in the following link: https://plnkr.co/edit/suOj7nGzPM6kS6Kd?open=main.js

Describe the Bug

Steps to Reproduce

To reproduce the bug, follow these steps:

  1. Create a new chart using the api.value.createRangeChart method.
  2. Set the chartType to "stackedBar" and the aggFunc to "sum".
  3. Define the chartThemeOverrides object with the bar property.
  4. Inside the bar property, define the series property with the itemStyler function.
  5. Call the getChart function to create the chart.

Actual Behaviour

When you run the code, you will notice that the itemStyler function is not working as expected. The bar color is not changing, and the chart is displayed with the default colors.

Expected Behaviour

The expected behaviour is that the itemStyler function should change the bar color based on the parameters passed to it.

More Information

For more information, please refer to the following images:

  • Image
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Version

The version of the Ag-Grid library used in this scenario is:

  • "ag-grid-enterprise": 30.0.0

Framework

The framework used in this scenario is Vue.

Browser

The bug is observable in all browsers.

Solution

To solve this bug, we need to modify the itemStyler function to correctly change the bar color. We can do this by accessing the params object and using its properties to determine the bar color.

Here is an example of how to modify the itemStyler function:

itemStyler: (params) => {
  const color = params.data.color; // access the color property of the data object
  return {
    fillStyle: color,
  };
}

In this example, we are accessing the color property of the data object and using it to set the fillStyle property of the itemStyler function.

Conclusion

In this article, we have explored a bug in the Ag-Grid library, specifically in the itemStyler function of the chartThemeOverrides object. We have also provided a solution to the bug by modifying the itemStyler function to correctly change the bar color. We hope that this article has been helpful in resolving this issue.

Additional Information

For more information on the Ag-Grid library, please refer to the official documentation: https://www.ag-grid.com/

Dependencies

The dependencies used in this scenario are:

  • "ag-grid-community": "^30.0.0"
  • "ag-grid-enterprise": "^30.0.0"
  • "ag-grid-vue3": "^30.0.0"

License

Q&A

Q: What is the issue with the itemStyler function?

A: The issue with the itemStyler function is that it is not working as expected. The bar color is not changing, and the chart is displayed with the default colors.

Q: What is the expected behavior of the itemStyler function?

A: The expected behavior of the itemStyler function is that it should change the bar color based on the parameters passed to it.

Q: How can I modify the itemStyler function to correctly change the bar color?

A: To modify the itemStyler function to correctly change the bar color, you can access the params object and use its properties to determine the bar color. For example:

itemStyler: (params) => {
  const color = params.data.color; // access the color property of the data object
  return {
    fillStyle: color,
  };
}

Q: What are the dependencies required to use the itemStyler function?

A: The dependencies required to use the itemStyler function are:

  • "ag-grid-community": "^30.0.0"
  • "ag-grid-enterprise": "^30.0.0"
  • "ag-grid-vue3": "^30.0.0"

Q: What is the version of the Ag-Grid library used in this scenario?

A: The version of the Ag-Grid library used in this scenario is:

  • "ag-grid-enterprise": 30.0.0

Q: What is the framework used in this scenario?

A: The framework used in this scenario is Vue.

Q: What is the browser used in this scenario?

A: The bug is observable in all browsers.

Q: How can I access the params object in the itemStyler function?

A: To access the params object in the itemStyler function, you can use the following code:

itemStyler: (params) => {
  console.log(params); // access the params object
  // use the params object to determine the bar color
}

Q: What are the properties of the params object?

A: The properties of the params object are:

  • data: the data object associated with the chart
  • index: the index of the chart
  • node: the node object associated with the chart
  • value: the value of the chart

Q: How can I use the itemStyler function to change the bar color based on the data?

A: To use the itemStyler function to change the bar color based on the data, you can access the data object and use its properties to determine the bar color. For example:

itemStyler: (params) => {
  const data = params.data;
  const color = data.color; // access the color property of the data object
  return {
    fillStyle: color,
  };
}

Q: What are the benefits of using the itemStyler function?

A: The benefits of using the itemStyler function are:

  • You can customize the appearance of the chart by changing the bar color.
  • You can use the itemStyler function to create a dynamic chart that changes based on the data.
  • You can use the itemStyler function to create a chart that is more visually appealing.

Q: What are the limitations of the itemStyler function?

A: The limitations of the itemStyler function are:

  • You need to have a good understanding of the Ag-Grid library and its APIs.
  • You need to have a good understanding of the itemStyler function and its properties.
  • You need to have a good understanding of how to access the params object and use its properties to determine the bar color.