Note: Make sure you have completed the React Native - Environment Setup instructions till "Creating a new application" step, before proceeding.

Preview

prview.mp4

Data Types

type GenericTreeNode = {
  id: number;
  objectId: string;
  title: string;
  data?: GenericTreeNode[];
  count?: number;
}

type TreeSpecificNode = GenericTreeNode & {
  isExpanded?: boolean;
  isSelected?: boolean;
  parentNode?: TreeSpecificNode;
};

type TreeData = GenericTreeNode[];

type SelectionChip = {
  title: string;
  isAll: boolean;
  selectedChildren: string;
  isLeaf: boolean | undefined;
  parentTitle: string | undefined;
};

const PRODUCT_LIST: TreeData = [
  {
    id: 1,
    objectId: "4399e8b7-921e-4c0a-895a-7de42684fd68",
    title: "Phones",
    data: [
      {
        id: 1,
        objectId: "c0b4d745-2f0a-4bcd-bdc2-eb6a8ebfc46b",
        title: "Apple",
        count: 180,
        data: [
          {
            id: 1,
            objectId: "81428cd4-ba9a-49b3-be8d-a05122e01fb3",
            title: "iPhone 15",
            count: 60,
            data: [
              {
                title: "64GB",
                count: 10,
                id: 1,
                objectId: "81428cd4-ba9a-49b3-be8d-a05122e01fb3",
              },
            ],
          },
        ],
      },
    ],
  },
];

Properties

Prop	Default	Type	Required	Description
data	-	TreeData	true	Array of data objects Must be of TreeData Type.
autoSelectChildren	false	boolean	false	When parent node is selected it will recursively select all of its children.
autoExpandChildren	false	bool	false	When parent expand is pressed it will expand its children.
onSelect	-	(items: TreeSpecificNode[]) => void	true	Event handler which is called when any item is selected returning all selected items array (can be used to sync tree state with any local component state)
onItemExpand	-	(item: TreeSpecificNode) => void	false	Event handler which is called when the node container or expand button pressed (can be used to catch pressed item)
onItemSelect	-	(item: TreeSpecificNode) => void	false	Similar to onSelect but returning the selected node only instead of all selected nodes array (can be used to build your own state instead of tree state)
renderSelectionChip	-	(chip: SelectionChip) => JSX.Element	false	Render selection chip instead of default component.
selectionChipContainerStyle	-	ViewStyle	false	Customize the chip container view.
nodeContainerStyle	-	ViewStyle	false	Control style of each tree node.
renderExpandCollapseIcon	-	(isExpanded: boolean) => React.ReactNode	false	Change the expand and collapse icon.
renderCheckMark	-	(isSelected: boolean) => React.ReactNode)	false	Change check mark icon.
renderParentItemContent	-	(itemTitle: string, subNodeTitleCount: string, isExpanded: boolean) => React.ReactNode	false	Change parent nodes content container this only includes title and sub nodes title and count.
renderLeafNodeContent	-	(itemTitle: string, itemCount: string) => React.ReactNode	false	similar to renderParentItemContent

How to run the project

Step 1: Start the Metro Server

First, you will need to start Metro, the JavaScript bundler that ships with React Native.

To start Metro, run the following command from the root of your React Native project:

# using npm
npm start

# OR using Yarn
yarn start

Step 2: Start your Application

Let Metro Bundler run in its own terminal. Open a new terminal from the root of your React Native project. Run the following command to start your Android or iOS app:

For Android

# using npm
npm run android

# OR using Yarn
yarn android

For iOS

# using npm
npm run ios

# OR using Yarn
yarn ios

If everything is set up correctly, you should see your new app running in your Android Emulator or iOS Simulator shortly provided you have set up your emulator/simulator correctly.

This is one way to run your app — you can also run it directly from within Android Studio and Xcode respectively.

How to test the project

yarn test