Multiple levels of categories

Oct 13, 2025 by wbrum.org 3 views

Introduction

In Salesforce Lightning, the Lightning-tree-grid component is a powerful tool for displaying hierarchical data in a tree-like structure. However, when dealing with complex category hierarchies, rendering at least 3 levels of categories associated with a product can be a challenging task. In this article, we will explore how to overcome this limitation and display multiple levels of categories in a Lightning-tree-grid.

Understanding the Issue

When you try to render 3 levels of categories in a Lightning-tree-grid, the component may ignore the hierarchy, resulting in a flat list of categories instead of a tree-like structure. This is because the Lightning-tree-grid component relies on a specific data structure and configuration to display hierarchical data.

Solution Overview

To render at least 3 levels of categories associated with a product in a Lightning-tree-grid, we will need to modify the data structure and configuration of the component. We will use a combination of Apex classes, Lightning components, and configuration settings to achieve this.

Step 1: Define the Data Structure

To display hierarchical data in a Lightning-tree-grid, we need to define a data structure that represents the category hierarchy. We will use a custom object called Category to store the category data.

// Category.sobject
// Id (string, 15)
// Name (string, 255)
// ParentId (string, 15)
// Children (list of Category)

Step 2: Create an Apex Class to Retrieve Category Data

We will create an Apex class called CategoryService to retrieve the category data from the Category object.

// CategoryService.cls
public class CategoryService {
    public static List<Category> getCategories() {
        List<Category> categories = [SELECT Id, Name, ParentId FROM Category];
        return categories;
    }
public static List&lt;Category&gt; getChildrenCategories(String parentId) {
    List&lt;Category&gt; childrenCategories = [SELECT Id, Name, ParentId FROM Category WHERE ParentId = :parentId];
    return childrenCategories;
}

}

Step 3: Create a Lightning Component to Display the Category Hierarchy

We will create a Lightning component called CategoryTreeGrid to display the category hierarchy.

// CategoryTreeGrid.html
<template>
    <lightning-tree-grid
        key-field="Id"
        data={categories}
        columns={columns}
        onrowaction={handleRowAction}
    >
        <template for:columns>
            <lightning-tree-grid-column
                field="Name"
                label="Name"
                type="text"
            />
            <lightning-tree-grid-column
                field="Children"
                label="Children"
                type="children"
            />
        </template>
    </lightning-tree-grid>
</template>
<script>
import { LightningTreeGrid, LightningTreeGridColumn } from 'lightning/treeGrid';
export default {
    components: {
        LightningTreeGrid,
        LightningTreeGridColumn
    },
    data() {
        return {
            categories: [],
            columns: [
                {
                    label: &#39;Name&#39;,
                    field: &#39;Name&#39;,
                    type: &#39;text&#39;
                },
                {
                    label: &#39;Children&#39;,
                    field: &#39;Children&#39;,
                    type: &#39;children&#39;
                }
            ]
        };
    },
    mounted() {
        this.categories = CategoryService.getCategories();
    },
    methods: {
        handleRowAction(event) {
            const row = event.detail.row;
            const childrenCategories = CategoryService.getChildrenCategories(row.Id);
            this.categories = this.categories.map(category =&gt; {
                if (category.Id === row.Id) {
                    category.Children = childrenCategories;
                }
                return category;
            });
        }
    }
};

</script>

Step 4: Configure the Lightning-Tree-Grid Component

We will configure the Lightning-tree-grid component to display the category hierarchy.

// CategoryTreeGridController.js
import { LightningTreeGrid, LightningTreeGridColumn } from 'lightning/treeGrid';
export default 
components {
LightningTreeGrid,
LightningTreeGridColumn
,
data() 
return {
columns [
{
label: 'Name',
field: 'Name',
type: 'text'
,

label 'Children',
field: 'Children',
type: 'children'

]
};
},
mounted() 
this.categories = CategoryService.getCategories();
},
methods {
handleRowAction(event) {
const row = event.detail.row;
const childrenCategories = CategoryService.getChildrenCategories(row.Id);
this.categories = this.categories.map(category => {
if (category.Id === row.Id) {
category.Children = childrenCategories;

return category;
});
}
}
};

Conclusion

In this article, we have explored how to render at least 3 levels of categories associated with a product in a Lightning-tree-grid. We have created a custom object called Category to store the category data, an Apex class called CategoryService to retrieve the category data, and a Lightning component called CategoryTreeGrid to display the category hierarchy. We have also configured the Lightning-tree-grid component to display the category hierarchy.

By following these steps, you can display multiple levels of categories in a Lightning-tree-grid and provide a more intuitive and user-friendly experience for your users.

Additional Resources

Example Use Cases

Displaying a product category hierarchy in a Lightning-tree-grid
Displaying a list of products with their corresponding category hierarchy in a Lightning-tree-grid
Displaying a category hierarchy with multiple levels of children in a Lightning-tree-grid

Troubleshooting

If the Lightning-tree-grid component is not displaying the category hierarchy correctly, check the data structure and configuration of the component.
If the Lightning-tree-grid component is not displaying the children categories correctly, check the Apex class and Lightning component code for any errors or issues.
Q&A: How to Render at Least 3 Levels of Categories Associated to a Product in a Lightning-Tree-Grid =============================================================================================

Q: What is the Lightning-Tree-Grid component and how does it work?

A: The Lightning-Tree-Grid component is a powerful tool in Salesforce Lightning that allows you to display hierarchical data in a tree-like structure. It is designed to work with complex data structures and can be configured to display multiple levels of categories.

Q: What are the key features of the Lightning-Tree-Grid component?

A: The Lightning-Tree-Grid component has several key features, including:

Hierarchical data display: The component can display hierarchical data in a tree-like structure.
Multiple levels of categories: The component can display multiple levels of categories, including children and grandchildren.
Customizable columns: The component allows you to customize the columns that are displayed, including the label, field, and type.
Row actions: The component allows you to perform actions on individual rows, such as editing or deleting.

Q: How do I configure the Lightning-Tree-Grid component to display multiple levels of categories?

A: To configure the Lightning-Tree-Grid component to display multiple levels of categories, you will need to:

Define a data structure that represents the category hierarchy.
Create an Apex class to retrieve the category data.
Create a Lightning component to display the category hierarchy.
Configure the Lightning-Tree-Grid component to display the category hierarchy.

Q: What are some common issues that I may encounter when using the Lightning-Tree-Grid component?

A: Some common issues that you may encounter when using the Lightning-Tree-Grid component include:

Data structure issues: If the data structure is not correctly defined, the component may not display the category hierarchy correctly.
Apex class issues: If the Apex class is not correctly written, the component may not retrieve the category data correctly.
Lightning component issues: If the Lightning component is not correctly written, the component may not display the category hierarchy correctly.

Q: How do I troubleshoot issues with the Lightning-Tree-Grid component?

A: To troubleshoot issues with the Lightning-Tree-Grid component, you can:

Check the data structure and configuration of the component.
Check the Apex class and Lightning component code for any errors or issues.
Use the Salesforce Developer Console to debug the component.
Contact Salesforce support for further assistance.

Q: What are some best practices for using the Lightning-Tree-Grid component?

A: Some best practices for using the Lightning-Tree-Grid component include:

Use a clear and consistent data structure: Make sure that the data structure is clearly defined and consistent throughout the component.
Use a well-written Apex class: Make sure that the Apex class is well-written and retrieves the category data correctly.
Use a well-written Lightning component: Make sure that the Lightning component is well-written and displays the category hierarchy correctly.
Test the component thoroughly: Make sure that the component is thoroughly tested and works correctly in different scenarios.

Q: Can I customize the Lightning-Tree-Grid component to meet my specific needs?

A: Yes, you can customize the Lightning-Tree-Grid component to meet your specific needs. You can customize the columns, row actions, and other features of the component to suit your requirements.

Q: What are some common use cases for the Lightning-Tree-Grid component?

A: Some common use cases for the Lightning-Tree-Grid component include:

Displaying a product category hierarchy: The component can be used to display a product category hierarchy in a tree-like structure.
Displaying a list of products with their corresponding category hierarchy: The component can be used to display a list of products with their corresponding category hierarchy.
Displaying a category hierarchy with multiple levels of children: The component can be used to display a category hierarchy with multiple levels of children.

Q: Can I use the Lightning-Tree-Grid component in a Salesforce Lightning app?

A: Yes, you can use the Lightning-Tree-Grid component in a Salesforce Lightning app. The component is designed to work with Salesforce Lightning and can be used in a variety of scenarios.